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1.
Small ; : e1906566, 2020 Jan 23.
Artigo em Inglês | MEDLINE | ID: mdl-31971671

RESUMO

Potassium ion batteries (KIB) have become a compelling energy-storage system owing to their cost effectiveness and the high abundance of potassium in comparison with lithium. However, its practical applications have been thwarted by a series of challenges, including marked volume expansion and sluggish reaction kinetics caused by the large radius of potassium ions. In line with this, the exploration of reliable anode materials affording high electrical conductivity, sufficient active sites, and structural robustness is the key. The synthesis of ZIF-8@ZIF-67 derived nitrogen-doped porous carbon confined CoP polyhedron architectures (NC@CoP/NC) to function as innovative KIB anode materials is reported. Such composites enable an outstanding rate performance to harvest a capacity of ≈200 mAh g-1 at 2000 mA g-1 . Additionally, a high cycling stability can be gained by maintaining a high capacity retention of 93% after 100 cycles at 100 mA g-1 . Furthermore, the potassium ion storage mechanism of the NC@CoP/NC anode is systematically probed through theoretical simulations and experimental characterization. This contribution may offer an innovative and feasible route of emerging anode design toward high performance KIBs.

2.
Small ; 16(5): e1904783, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31943792

RESUMO

The increasing application of exposed high energy facet is an effective strategy to improve the photocatalytic performance of photocatalysts because the vacancies are beneficial to photocatalytic reaction. Vacancy dominates numerous distinct properties of semiconductor materials and thus plays a conclusive role in the photocatalysis applications. In this work, two kinds of BiOI nanomaterials with different vacancies are synthesized via a facile solvothermal method. The positron annihilation analysis shows that the thinner BiOI nanosheets possess larger-sized vacancy than BiOI nanoplates. Thus, BiOI nanosheets show the enhanced separation efficiency of electron-hole pairs and adsorption ability for contaminants under visible light. The results are also validated with the first-principle computation. Therefore, higher photocatalytic activity to the photodegradation of tetracycline is observed from the nanosheets than that obtained from BiOI nanoplates. This work not only arouses attention to vacancies, but also opens up an avenue for precision design of vacancies to prepare novel photocatalytic materials driven under solar light.

3.
Molecules ; 25(1)2020 Jan 05.
Artigo em Inglês | MEDLINE | ID: mdl-31948058

RESUMO

Grapefruit essential oil has been proven to have wide range of bioactivities. However, bioactivity of its molecular distillate has not been well studied. In this study, a light phase oil was obtained by molecular distillation from cold-pressed grapefruit essential oil and GC-MS was used to identify its chemical composition. The antimicrobial activity of the light phase oil was tested by filter paper diffusion method, and the anticancer activity was determined by the Cell Counting Kit-8 (CCK-8) assay. Twenty-four components were detected with a total relative content of 99.74%, including 97.48% of terpenes and 1.66% of oxygenated terpenes. The light phase oil had the best antimicrobial effect on Bacillus subtilis, followed by Escherichia coli, Staphylococcus aureus and Salmonellaty phimurium. DPPH and ABTS assays demonstrated that the light phase oil had good antioxidant activity. The CCK-8 assay of cell proliferation showed that the light phase oil had a good inhibitory effect on the proliferation of HepG2 liver cancer cells and HCT116 colon cancer cells.

4.
ACS Nano ; 14(1): 867-876, 2020 Jan 28.
Artigo em Inglês | MEDLINE | ID: mdl-31898892

RESUMO

3D printing technology has stimulated a burgeoning interest to fabricate customized architectures in a facile and scalable manner targeting wide ranged energy storage applications. Nevertheless, 3D-printed hybrid capacitor devices synergizing favorable energy/power density have not yet been explored thus far. Herein, we demonstrate a 3D-printed sodium-ion hybrid capacitor (SIC) based on nitrogen-doped MXene (N-Ti3C2Tx) anode and activated carbon cathode. N-Ti3C2Tx affording a well-defined porous structure and uniform nitrogen doping can be obtained via a sacrificial template method. Thus-formulated ink can be directly printed to form electrode architecture without the request of a conventional current collector. The 3D-printed SICs, with a large areal mass loading up to 15.2 mg cm-2, can harvest an areal energy/power density of 1.18 mWh cm-2/40.15 mW cm-2, outperforming the state-of-the-art 3D-printed energy storage devices. Furthermore, our SIC also achieves a gravimetric energy/power density of 101.6 Wh kg-1/3269 W kg-1. This work demonstrates that the 3D printing technology is versatile enough to construct emerging energy storage systems reconciling high energy and power density.

5.
Zygote ; 28(1): 59-64, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31662136

RESUMO

Kaempferol (KAE) is one of the most common dietary flavonols possessing biological activities such as anticancer, anti-inflammatory and antioxidant effects. Although previous studies have reported the biological activity of KAE on a variety of cells, it is not clear whether KAE plays a similar role in oocyte and embryo in vitro culture systems. This study investigated the effect of KAE addition to in vitro maturation on the antioxidant capacity of embryos in porcine oocytes after parthenogenetic activation. The effects of kaempferol on oocyte quality in porcine oocytes were studied based on the expression of related genes, reactive oxygen species, glutathione and mitochondrial membrane potential as criteria. The rate of blastocyst formation was significantly higher in oocytes treated with 0.1 µm KAE than in control oocytes. The mRNA level of the apoptosis-related gene Caspase-3 was significantly lower in the blastocysts derived from KAE-treated oocytes than in the control group and the mRNA expression of the embryo development-related genes COX2 and SOX2 was significantly increased in the KAE-treated group compared with that in the control group. Furthermore, the level of intracellular reactive oxygen species was significantly decreased and that of glutathione was significantly increased after KAE treatment. Mitochondrial membrane potential (ΔΨm) was increased and the activity of Caspase-3 was significantly decreased in the KAE-treated group compared with that in the control group. Taken together, these results suggested that KAE is beneficial for the improvement of embryo development by inhibiting oxidative stress in porcine oocytes.

6.
Sci Total Environ ; 699: 134341, 2020 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-31678874

RESUMO

The efficient enrichment and remediation of heavy metals from realistic wastewater and contaminated soil containing large excess of competitive ions remains a daunting challenge by far. In the present study, flower-like molybdenum disulfide decorated with iron oxide nanoparticles (MoS2/Fe3O4) is designed via a two-step hydrothermal method and mainly applied in the removal of Hg(II) and Pb(II) ions in aqueous environment. Exhaustive morphological, chemical and magnetic characterizations verify the successful formation of magnetic MoS2/Fe3O4. Batch adsorption experiments show that the obtained MoS2/Fe3O4 nanohybrid enables efficient capture of Hg(II) and Pb(II) ions, accompanied by ease-of-separation from solution by simply applying a magnet. In this respect, high adsorption capacities (263.6 mg g-1 for Pb(II) and 428.9 mg g-1 for Hg(II)) can be gained under optimized conditions (pH = 5.0; 298 K; nanohybrid dosage: 0.8 g L-1 and the contact time: 180 min). In addition, the effects of different parameters such as initial Pb(II)/Hg(II) concentration (50-500 mg L-1), temperature (298, 308 and 318 K) and co-existing ions (Zn(II), Cu(II), Cd(II) and Mg(II)) were systematically probed. The favorable adsorption capacity, selectivity and recyclability mainly originates from the strong Hg2+/Pb2+···S2- bonding interactions. Practical application potential of magnetic MoS2/Fe3O4 nanohybrid in realistic lead-acid battery industry wastewater and Pb(II)-contaminated soil is further explored, achieving promising results with high Pb(II) removal efficiency of 99.63% for wastewater and 57.15% for soil. Simple preparation, easy separation and high adsorption capacity would foster thus-designed sulfide-based nanohybrid a promising adsorbent for heavy metal removal from wastewater and contaminated soil.

7.
Front Plant Sci ; 10: 1290, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31781131

RESUMO

During early periods of salt stress, reduced stomatal opening can prevent water loss and wilting. Abscisic acid (ABA) signal plays an important role in this process. Here, we show that cucumber grafted onto pumpkin exhibits rapid stomatal closure, which helps plants to adapt to osmotic stress caused by salinity. Increased ABA contents in the roots, xylem sap, and leaves were evaluated in two grafting combinations (self-grafted cucumber and cucumber grafted onto pumpkin rootstock). The expression levels of ABA biosynthetic or signaling related genes NCED2 (9-cis-epoxycarotenoid dioxygenase gene 2), ABCG22 (ATP-binding cassette transporter genes 22), PP2C (type-2C protein phosphatases), and SnRK2.1 (sucrose non-fermenting 1-related protein kinases 2) were investigated. Results showed that a root-sourced ABA signal led to decreased stomatal opening and transpiration in the plants grafted onto pumpkin. Furthermore, plants grafted onto pumpkin had increased sensitivity to ABA, compared with self-grafted cucumbers. The inhibition of ABA biosynthesis with fluridon in roots increased the transpiration rate (Tr) and stomatal conductance (Gs) in the leaves. Our study demonstrated that the roots of pumpkin increases the sensitivity of the scion to ABA delivered from the roots to the shoots, and enhances osmotic tolerance under NaCl stress. Such a mechanism can be greatly exploited to benefit vegetable production particularly in semiarid saline regions.

8.
Oncol Rep ; 42(6): 2345-2354, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31638254

RESUMO

Since the current methods of treatment for malignant glioma, radiotherapy and chemotherapy, are unsatisfactory, the development of novel therapeutic compounds is required. In the present study, the inhibitory effect of tetrandrine citrate (TetC) on the proliferation of human glioma U87 cells, as well as its mechanism of action, were investigated. An MTT assay was used to assess cell viability in vitro, and the production of intracellular reactive oxygen species (ROS) was determined by assessing the fluorescence intensity of 2,7­-dichlorofluorescein (DCF). Flow cytometry was used to determine the level of apoptosis and cell cycle status, and the protein expression levels of apoptosis­associated proteins were determined using western blotting. Additionally, the antitumor activity of TetC was assessed in vivo using a nude mouse xenograft model. The results revealed that in vitro, the proliferative rate of U87, U251 and human umbilical vein endothelial cells (HUVECs) was significantly reduced in a dose­dependent manner following treatment with TetC, although TetC had the greatest inhibitory effect on U87 cells. The vacuolization and apoptosis of U87 cells was induced using 10 and 20 µmol/l TetC, respectively. The overall proliferative inhibition was associated with an increase in the levels of ROS and apoptosis. In TetC­treated cells, the expression levels of apoptosis­related proteins, including cleaved (CL) caspase­3, Fas, phosphorylated (p)­p38 and p­JNK, were increased, whereas those of caspase­3 and Bcl­2 were decreased. In vivo, TetC was highly effective at inhibiting the growth of human glioma U87 xenografts in BALB/c nude mice, with a percentage growth inhibition of ≥68.7%. These findings indicated that the potent antitumor activity of TetC may be mediated through an increase in ROS levels, the downregulation of Bcl­2, and the upregulation of CL caspase­3, Fas, p­p38 and p­JNK expression levels.

9.
ACS Nano ; 13(11): 13235-13243, 2019 Nov 26.
Artigo em Inglês | MEDLINE | ID: mdl-31652045

RESUMO

Lithium-sulfur (Li-S) batteries are recognized as one of the most promising energy storage systems due to the high energy density and cost effectiveness. However, their practical implementation has still been handicapped due to notorious lithium polysulfide (LiPS) shuttle and depressed sulfur redox kinetics. It is therefore desirable to exploit key mediators synergizing electrical conductivity and electrocatalytic activity for the cathode. Herein, we report the employment of atmospheric pressure chemical vapor deposition to harness the efficient and controllable synthesis of metallic VTe2 over particulated MgO substrates, which has scarcely been demonstrated by conventional wet-chemical synthetic routes thus far. The thus-derived VTe2@MgO heterostructure as an efficient promotor enables effective regulation of LiPSs with respect to polysulfide capture/conversion and Li2S decomposition. As a result, a S/VTe2@MgO cathode with a sulfur loading of 1.6 mg cm-2 harvests long-term cyclability with a negligible capacity decay of 0.055% per cycle over 1000 cycles at 1.0 C. Even at a sulfur loading of 6.9 mg cm-2, the cathode still delivers electrochemical performances that can rival the state-of-the-art high-loading counterparts. Our work might offer a feasible solution for developing heterostructured promotors with multifunctionality and electrocatalytic activity for high-performance Li-S batteries.

10.
Nat Commun ; 10(1): 4913, 2019 10 29.
Artigo em Inglês | MEDLINE | ID: mdl-31664025

RESUMO

Wearable and portable self-powered units have stimulated considerable attention in both the scientific and technological realms. However, their innovative development is still limited by inefficient bulky connections between functional modules, incompatible energy storage systems with poor cycling stability, and real safety concerns. Herein, we demonstrate a flexible solar-charging integrated unit based on the design of printed magnesium ion aqueous asymmetric supercapacitors. This power unit exhibits excellent mechanical robustness, high photo-charging cycling stability (98.7% capacitance retention after 100 cycles), excellent overall energy conversion and storage efficiency (ηoverall = 17.57%), and outstanding input current tolerance. In addition, the Mg ion quasi-solid-state asymmetric supercapacitors show high energy density up to 13.1 mWh cm-3 via pseudocapacitive ion storage as investigated by an operando X-ray diffraction technique. The findings pave a practical route toward the design of future self-powered systems affording favorable safety, long life, and high energy.

11.
Environ Pollut ; 254(Pt A): 112969, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31398638

RESUMO

The increasing application and subsequent mass production of graphene-family materials (GFMs) will lead to greater possibilities for their release into the environment. Although GFMs exhibit toxicity toward various aquatic organisms, little information is available on their influence on gut microbiota of aquatic organism. In this study, zebrafish were fed diets containing three GFMs, namely, monolayer graphene powder (GR), graphene oxide nanosheet (GO) and reduced graphene oxide powder (rGO), or appropriate control for 21 days. The gut bacterial communities were then characterized for comparison of the exposure effects of each GFM. Alterations of the intestinal morphology and oxidative stress indicators were also examined. The results showed GFMs led to different inflammatory responses and significantly altered the relative composition of the gut bacterial species by increasing the relative abundance of Fusobacteria and the genus Cetobacterium and Lactobacillus and decreasing the abundance of Firmicutes and the genus Pseudomonas; GR caused marked shifts in the diversity of the gut microbiota. The GFMs also altered the intestinal morphology and antioxidant enzyme activities by inducing more vacuolation and generating more goblet cells. Our findings demonstrate that GFM exposure poses potential health risks to aquatic organisms through alteration of the gut microbiota.


Assuntos
Disbiose/induzido quimicamente , Microbioma Gastrointestinal/efeitos dos fármacos , Grafite/toxicidade , Peixe-Zebra/microbiologia , Animais , Bactérias/classificação , Bactérias/crescimento & desenvolvimento , Bactérias/isolamento & purificação , Exposição Dietética , Intestinos/microbiologia , Óxidos/farmacologia
12.
Clin Lab ; 65(7)2019 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-31307169

RESUMO

BACKGROUND: The current study aims to explore the changes of serum miR-587 level in patients with metabolic syndrome (MS) and analyze its clinical diagnostic value. METHODS: The serum levels of miR-587 in 50 patients with hyperglycemia, 50 patients with hyperlipidemia, and 50 healthy controls were detected by RT-qPCR. The diagnostic value of serum miR-587 was detected by ROC analy-sis and correlation analysis in MS. Dual luciferase reporter assay was carried out to determine the possible target gene of miR-587. RESULTS: The results of RT-qPCR showed that the relative content of serum miR-587 in patients with hyperglyce-mia and hyperlipidemia was 0.45 ± 0.30, 0.41 ± 0.30, compared with 1 ± 0.87 in healthy people. The area under ROC curve (AUC) of serum miR-587 in hyperglycemic patients was 0.830 (95% CI = 0.716 - 0.863, p < 0.001), with the sensitivity of 68.6% and specificity of 89.3%. The AUC of serum miR-587 in hyperlipidemia patients was 0.790 (95% CI = 0.759 - 0.851, p < 0.001), with the sensitivity of 78% and specificity of 89.7%. Correlation analysis showed that serum miR-587 level was negatively correlated with fasting blood glucose (FBG) (r = -0.291, p < 0.05), and negatively correlated with total cholesterol (TC) (r = -0.243, p < 0.01). Furthermore, dual luciferase reporter assay showed that PTEN was the target gene of miR-587. CONCLUSIONS: In summary the decreased expression of miR-587 in serum is a potential diagnostic marker and in-dependent risk factor in patients with MS.


Assuntos
Biomarcadores/sangue , Regulação da Expressão Gênica , Síndrome Metabólica/sangue , Síndrome Metabólica/diagnóstico , MicroRNAs/sangue , Glicemia/metabolismo , Colesterol/sangue , Jejum/sangue , Feminino , Humanos , Hiperglicemia/sangue , Hiperglicemia/diagnóstico , Hiperglicemia/genética , Hiperlipidemias/sangue , Hiperlipidemias/diagnóstico , Hiperlipidemias/genética , Masculino , Síndrome Metabólica/genética , MicroRNAs/genética , Pessoa de Meia-Idade , Curva ROC
13.
ACS Nano ; 13(7): 7517-7526, 2019 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-31150583

RESUMO

Mass production of graphene powders affording high quality and environmental benignancy serves as a prerequisite for the practical usage of graphene in multiple energy storage applications. Herein, we exploit a salt-templated CVD approach to harness the direct synthesis of nitrogen-doped graphene (NG) nanosheets and related ink dispersions in a scalable, safe, efficient, and green fashion. Thus-fabricated NG accompanying large productivity, excellent electrical conductivity, and favorable solution processability possesses implications in printable energy storage devices. With the NG-based ink in hand, self-standing 3D architectures with programmable patterns can be directly printed over a myriad of substrates. Accordingly, both electrode preparation for flexible supercapacitors and separator modification in Li-S batteries can be enabled via printing by employing our NG-based composite inks. This work thus represents a practical route for mass production of graphene inks with cost-effectiveness and eco-friendliness for emerging energy storage technology.

14.
Clin Lab ; 65(6)2019 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-31232032

RESUMO

BACKGROUND: The current study mainly evaluated whether peripheral blood miR-937 could be a biomarker to differentiate patients with metabolic disorders and healthy controls. METHODS: The peripheral blood was collected with patients with hyperglycemia, hyperlipidemia and healthy control. The relative peripheral blood miR-937 level in patients with metabolic disorders and healthy individuals were evaluated by real-time PCR. Receiver operating characteristic curve (ROC) analysis and Spearman's correlation coefficient were applied to evaluate whether miR-937 could be a potential biomarker for metabolic disorders. Dual luciferase reporter assay was performed to identify the possible target genes of miR-937. RESULTS: First, miR-937 was significantly increased (8.02 ± 8.27) in the peripheral blood of hyperglycemia patients. The level of miR-937 of patients with hyperlipidemia (13.7 ± 14.72) was also enhanced obviously compared with healthy controls (1 ± 1.35). ROC analysis showed that the peripheral blood levels of miR-937 could screen patients with hyperglycemia or hyperlipidemia from healthy controls. Furthermore, peripheral blood miR-937 level posi-tively correlated with serum glucose level (r = 0.556, p < 0.01) as well as total serum TG/TC levels (r = 0.455, p < 0.01). Dual luciferase reporter assay indicated that miR-937 suppressed the relative luciferase activity of pmir-GLO-AMPKα-3'UTR. CONCLUSIONS: The upregulation of circulating miR-937 level may cause a metabolism disorder by suppressing the expression of AMPKα. miR-937 could be a potential biomarker to differentiate patients with metabolism syndrome from healthy controls.


Assuntos
Proteínas Quinases Ativadas por AMP/genética , Biomarcadores/metabolismo , Doenças Metabólicas/genética , MicroRNAs/genética , Regiões 3' não Traduzidas/genética , Biomarcadores/sangue , Feminino , Regulação da Expressão Gênica , Células HEK293 , Células Hep G2 , Humanos , Hiperglicemia/sangue , Hiperglicemia/diagnóstico , Hiperglicemia/genética , Hiperlipidemias/sangue , Hiperlipidemias/diagnóstico , Hiperlipidemias/genética , Masculino , Doenças Metabólicas/sangue , Doenças Metabólicas/diagnóstico , MicroRNAs/sangue , Pessoa de Meia-Idade , Curva ROC
16.
Nat Commun ; 10(1): 1912, 2019 04 23.
Artigo em Inglês | MEDLINE | ID: mdl-31015405

RESUMO

Impurities produced during the synthesis process of a material pose detrimental impacts upon the intrinsic properties and device performances of the as-obtained product. This effect is especially pronounced in graphene, where surface contamination has long been a critical, unresolved issue, given graphene's two-dimensionality. Here we report the origins of surface contamination of graphene, which is primarily rooted in chemical vapour deposition production at elevated temperatures, rather than during transfer and storage. In turn, we demonstrate a design of Cu substrate architecture towards the scalable production of super-clean graphene (>99% clean regions). The readily available, super-clean graphene sheets contribute to an enhancement in the optical transparency and thermal conductivity, an exceptionally lower-level of electrical contact resistance and intrinsically hydrophilic nature. This work not only opens up frontiers for graphene growth but also provides exciting opportunities for the utilization of as-obtained super-clean graphene films for advanced applications.

17.
J Colloid Interface Sci ; 545: 63-70, 2019 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-30875508

RESUMO

Seeking highly-efficient and cost-effective photocatalyst remains key to boosting photocatalytic H2 evolution activity. Herein we have designed an innovative, non-heavy-metal-based hybrid photocatalyst via in-situ decoration of ZnS nanoparticles with Ti3C2 MXene nanosheets toward enhanced photocatalytic H2 production. The incorporation of Ti3C2 essentially promotes the charge transfer and extends the lifetime of photo-induced carriers, thereby resulting in an augmented H2 production yield of 502.6 µmol g-1 h-1 under optimal conditions, being almost 4-fold higher than pure ZnS (124.6 µmol g-1 h-1). Thus, this work has demonstrated ZnS/MXene photocatalytic as a promising candidate for hydrogen generation to boost the entire clean energy system and provided a new insight into further broadening the water splitting application of MXene-based materials.

18.
ACS Appl Mater Interfaces ; 11(6): 5687-5694, 2019 Feb 13.
Artigo em Inglês | MEDLINE | ID: mdl-30714710

RESUMO

Lithium-sulfur (Li-S) batteries have now emerged as the next-generation rechargeable energy storage system because of the high energy density and theoretical capacity. However, the notorious "lithium polysulfide (LiPS) shuttle" and sluggish kinetics in sulfur redox have posted great threat to their practical applications. Herein, we develop a VN-modified separator as an effective promoter to regulate the LiPSs and accelerate the electrochemical kinetics of Li-S batteries. Benefiting from the dense packing structure and polar surface of porous VN, the VN-modified separator favorably synergizes bifunctionality of physical confinement and chemical entrapment toward LiPSs while affording smooth lithium-ion migration. In addition, the superb electrical conductivity of VN also propels the LiPS conversion. With these advantages, thus-integrated batteries with VN-modified separator exhibit an average capacity decay of 0.077% per cycle at 1 C for 800 cycles. A reasonable areal capacity of 4.2 mAh cm-2 is achieved even with a high sulfur mass loading of 3.8 mg cm-2 at 0.2 C. The present work offers a rational strategy to regulate the LiPS behavior and guide the sulfur redox kinetics toward effective and long-life Li-S batteries.

19.
Adv Mater ; 31(15): e1806314, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30697837

RESUMO

The development of efficient photocatalysts for the degradation of organic pollutants and production of hydrogen peroxide (H2 O2 ) is an attractive two-in-one strategy to address environmental remediation concerns and chemical resource demands. Graphitic carbon nitride (g-C3 N4 ) possesses unique electronic and optical properties. However, bulk g-C3 N4 suffers from inefficient sunlight absorption and low carrier mobility. Once exfoliated, ultrathin nanosheets of g-C3 N4 attain much intriguing photocatalytic activity. Herein, a mussel-inspired strategy is developed to yield silver-decorated ultrathin g-C3 N4 nanosheets (Ag@U-g-C3 N4 -NS). The optimum Ag@U-g-C3 N4 -NS photocatalyst exhibits enhanced electrochemical properties and excellent performance for the degradation of organic pollutants. Due to the photoformed valence band holes and selective two-electron reduction of O2 by the conduction band electrons, it also renders an efficient, economic, and green route to light-driven H2 O2 production with an initial rate of 0.75 × 10-6 m min-1 . The improved photocatalytic performance is primarily attributed to the large specific surface area of the U-g-C3 N4 -NS layer, the surface plasmon resonance effect induced by Ag nanoparticles, and the cooperative electronic capture properties between Ag and U-g-C3 N4 -NS. Consequently, this unique photocatalyst possesses the extended absorption region, which effectively suppresses the recombination of electron-hole pairs and facilitates the transfer of electrons to participate in photocatalytic reactions.


Assuntos
Poluentes Ambientais , Grafite , Nanopartículas Metálicas , Nitrilos , Animais , Química Verde/métodos , Prata
20.
Chem Commun (Camb) ; 55(9): 1291-1294, 2019 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-30633252

RESUMO

An innovative photo-enhanced aqueous redox battery (PEARB) built upon a simple two-electrode configuration is demonstrated. The synergy of the photo-cathode and battery-anode is realized by directly growing vertically oriented SnS2 arrays on Ti mesh, manifesting advanced photo-electrocatalytic activities. The assembled PEARB achieves 2.5-fold capacity enhancement under solar illumination.

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