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1.
Spectrochim Acta A Mol Biomol Spectrosc ; 248: 119269, 2020 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-33302217

RESUMO

Developing high performance fluorescent chemosensor for Al3+ detection is highly desirable, due to the excess of Al3+ will lead to many diseases. In this paper, a simple 2-hydroxynaphthalene-based fluorescent chemosensor has been synthesized and characterized by different spectroscopic methods. The compound exhibited an "turn-on-type" fluorescent chemosensing for the detection of Al3+, which was ascribed to the chelation-enhanced fluorescence (CHEF). The high selectivity and sensitivity of the compound for Al3+ were verified by fluorescence spectra in its DMF solution, and the enhancement of fluorescent intensity could be observed by naked-eye from non-fluorescence to green light. The detection limit of the compound for Al3+ was found to be 4.22 × 10-8 M and the stability constant was 4.82 × 104 M-1. The 1:1 binding stoichiometry of the compound to Al3+ was confirmed from the Job's plot based on fluorescence titrations. Additionally, the sensing process of the compound to Al3+ was chemically reversible by adding Na2EDTA. Importantly, the probe was successfully applied to quantitative analysis of Al3+ in real drug and potable water samples.

2.
J Colloid Interface Sci ; 584: 332-343, 2020 Sep 28.
Artigo em Inglês | MEDLINE | ID: mdl-33070073

RESUMO

Control and insight into the abundance of inter-shelled channel active sites and charge transport mechanism are the long-term challenges for enhancing photocatalytic activity. Herein, the Ni2P quantum dots (QDs) are decorated in the multi-shelled CaTiO3 cube for creating the abundance of inter-shelled channel active sites, which greatly improve the photocatalytic performances for generating H2 and degrading tetracycline (TC) relative to pure CaTiO3 and Ni2P. Moreover, the Z-scheme mechanism and the quantum effect of the Ni2P in multi-shelled CaTiO3 cube play a crucial role for enhancing photocatalytic performance. Furthermore, the photoelectric researches demonstrate that the Ni2P/CaTiO3 heterostructure possesses more abundant active sites, smaller interface transmission resistance and faster photo-generated charge transfer efficiency. This work provides a meaningful model to research other materials with creating the abundance of inter-shelled channel active sites for the photo-electrocatalytic field.

3.
Acta Oncol ; : 1-8, 2020 Oct 16.
Artigo em Inglês | MEDLINE | ID: mdl-33063569

RESUMO

PURPOSE: To evaluate the LETd-weighted biological dose to OARs in proton therapy for breast cancer and to study the relationship of the LETd-weighted biological dose relative to the standard dose (RBE = 1.1) and thereby to provide estimations of the biological dose uncertainties with the standard dose calculations (RBE = 1.1) commonly used in clinical practice. METHOD: This study included 20 patients who received IMPT treatment to the whole breast/chest wall and regional lymph nodes. The LETd distributions were calculated along with the physical dose using an open-source Monte Carlo simulation package, MCsquare. Using the McMahon linear model, the LETd-weighted biological dose was computed from the physical dose and LETd. OAR doses were compared between the Dose (RBE = 1.1) and the LETd-weighted biological dose, on brachial plexus, rib, heart, esophagus, and Ipsilateral lung. RESULTS: On average, the LETd-weighted biological dose compared to the Dose (RBE = 1.1) was higher by 8% for the brachial plexus D0.1 cc, 13% for the ribs D0.5 cc, 24% for mean heart dose, and 10% for the esophagus D0.1 cc, respectively. The LETd-weighted doses to the Ipsilateral lung V5, V10, and V20 were comparable to the Dose (RBE = 1.1). No statistically significant difference in biological dose enhancement to OARs was observed between the intact breast group and the CW group, with the exception of the ribs: the CW group experienced slightly greater biological dose enhancement (13% vs. 12%, p = 0.04) to the ribs than the intact breast group. CONCLUSION: Enhanced biological dose was observed compared to standard dose with assumed RBE of 1.1 for the heart, ribs, esophagus, and brachial plexus in breast/CW and regional nodal IMPT plans. Variable RBE models should be considered in the evaluation of the IMPT breast plans, especially for OARs located near the end of range of a proton beam. Clinical outcome studies are needed to validate model predictions for clinical toxicities.

4.
Phys Med ; 77: 84-91, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32799050

RESUMO

PURPOSE: To investigate, in proton therapy, whether the Gamma passing rate (GPR) is related to the patient dose error and whether MU scaling can improve dose accuracy. METHODS: Among 20 consecutively treated breast patients selected for analysis, two IMPT plans were retrospectively generated: (1) the pencil-beam (PB) plan and (2) the Monte Carlo (MC) plan. Patient-specific QA was performed. A 3%/3-mm Gamma analysis was conducted to compare the TPS-calculated PB algorithm dose distribution with the measured 2D dose. Dose errors were compared between the plans that passed the Gamma testing and those that failed. The MU was then scaled to obtain a better GPR. MU-scaled PB plan dose errors were compared to the original PB plan. RESULTS: Of the 20 PB plans, 8 were passed Gamma testing (G_pass_group) and 12 failed (G_fail_group). Surprisingly, the G_pass_group had a greater dose error than the G_fail_group. The median (range) of the PTV DVH RMSE and PTV ΔDmean were 1.36 (1.00-1.91) Gy vs 1.18 (1.02-1.80) Gy and 1.23 (0.92-1.71) Gy vs 1.10 (0.87-1.49) Gy for the G_pass_group and the G_fail_group, respectively. MU scaling reduced overall dose error. However, for PTV D99 and D95, MU scaling worsened some cases. CONCLUSION: For breast IMPT, the PB plans that passed the Gamma testing did not show smaller dose errors compared to the plans that failed. For individual plans, the MU scaling technique leads to overall smaller dose errors. However, we do not suggest use of the MU scaling technique to replace the MC plans when the MC algorithm is available.

5.
Comput Inform Nurs ; 2020 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-32694483

RESUMO

Internet-based home care has emerged as a way to relieve the burden of hospitals and meet patients' need for home care. This study aims to explore nurses' attitudes toward Internet-based home care. A cross-sectional online survey was conducted in Ningbo City in China. A self-designed Internet-based home care attitudes questionnaire for nurses (23 items) was used. There were 2039 nurses from 13 hospitals who participated in this online survey. Results reveal that, 1369 nurses (67.1%) were willing to provide Internet-based home care. However, there were significant differences in the attitudes of nurses with different ages (H = 11.86, P = .001), years of work experience (H = 24.257, P = .000), positions (H = 8.850, P = .031), and types of phones (H = 13.096, P = .001). More than 80% of nurses were willing to provide hypodermic and intramuscular injection. But there was a significant difference in the attitudes toward hypodermic injection, intramuscular injection, and pressure ulcer care in nurses with different ages (H = 13.039, P = .005; H = 9.178, P = .027; H = 10.997, P = .012) and a significant difference in the attitudes toward pressure ulcer care in nurses with different years of work experience (H = 15.259, P = .002). Results also indicated that most nurses were worried about their own safety and personal rights protection during Internet-based home care.

6.
J Colloid Interface Sci ; 576: 21-33, 2020 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-32408163

RESUMO

It is highly desirable to combine the microstructure management and heterostructure construction technique to remold inherent wide band gap semiconductor CaTiO3 with the purpose of enhancing its visible light absorption capacity and photocatalytic performance. Herein, a novel multi-shelled hollow cube Bi12O17Cl2/CaTiO3 heterostructure has been successfully synthesized by a facile template-free method for photocatalytic hydrogen production and degradation pollutants in water under the visible light. The investigations of microstructure, physicochemical property and photoelectric behaviors indicate that the multi-shelled hollow cube architecture and synergetic effect of 2D-3D structural coupling are dominant reasons to enhance phototcatalytic performance, which can significantly improve the absorption and utilization of visible light, multiply abundant active radical generation and boost the separation and migration efficiency of photoproduced electron-hole pairs. Moreover, the probable photocatalytic reaction mechanisms, the feasible migration behaviors of photo-produced charges, the influence factors of enhancing photocatalytic activities are proposed in depth. It is intended that further innovative works on the multi-shelled hollow cube architecture design of high-performance photocatalyst by facile template-free hydrothermal method can be inspired.

7.
Sci Total Environ ; 715: 136575, 2020 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-32007870

RESUMO

The presence of persistent free radicals (PFR) in biochars may greatly broaden the application of biochars in pollution control, but may also cause negative impacts to the environment. Understanding the structural basis and the formation mechanisms of PFR is essential for a targeted biochar production and application. This study used rice straw (RS), a ubiquitous agricultural waste, to investigate the generation processes of PFR in relation to RS pyrolysis kinetics. Based on a detailed thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis, the activation energy was calculated by Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods. This work combined pyrolysis kinetics analysis and solid particle characterization. Our results showed that lignin started to pyrolyze at a lower temperature than cellulose and hemicellulose. Lignin was the main factor for PFR generation. Chemical bond breaking contributed only slightly to PFR formation. The reconfiguration of the carbonaceous structures may be a more important contributor to PFR formation, while the cross-linking between different compositions and the interactions between the chemical compositions and inorganic minerals may play a significant role for PFR generation and stabilization in RS. This study provides useful theoretical basis to understand the thermal pyrolysis process of RS and the manipulation of biochar properties.


Assuntos
Oryza , Carvão Vegetal , Radicais Livres , Cinética , Pirólise
8.
Pathol Res Pract ; 216(2): 152778, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31831299

RESUMO

BACKGROUND: miRNA was recently detected as tumor suppressor or inducer in various cancers including gliomas. Due to the abnormal expression of miR-4262 in glioma cancer, we supposed that miR-4262 made efforts in proliferation and migration in glioma cancer. METHODS: CCK-8, Transwell migration Assay and Wound-healing assay were appraisal assays for cell proliferation and migration. qRT-PCR and western blot were performed to test the expression of miR-4262, MMP2, MMP13 and LATS1 in glioma cancers tissues and cancer cells. The targeting detection between miR-4262 and LATS1 was detected by luciferase reporter assay. RESULTS: miR-4262 expression was dramatically higher in glioma tumor tissues than in para-tumor control. Inhibition of miR-4262 in glioma cancer cells prominently inhibited cell proliferation and migration. Mechanically, downregulation of miR-4262 inhibited expression of matrix metalloproteinase (MMP) -2, -13. In addition, miR-4262 directly and negatively modulated expression of large tumor suppressor 1 (LATS1). Moreover, we discovered that overexpression of LATS1 could reverse the effects of miR-4262 on cell proliferation and migration, as well as the production of MMP-2, -13. CONCLUSIONS: In glioma cancer, miR-4262 regulated cell proliferation and migration mediated by LATS1. This indicated that miR-4262 is a tumor inducer in glioma cancer and may be a feasible target for glioma therapy.

9.
J Colloid Interface Sci ; 553: 186-196, 2019 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-31203003

RESUMO

A series of Z-scheme I-BiOBr/Bi12GeO20 heterostructures were successfully obtained by a simple method. The Z-scheme I-BiOBr/Bi12GeO20 heterostructures show outstanding photocatalytic performance for degrading the various organic pollutants of the waste water. For degradation of Tetracycline (TC), the Z-scheme 30I-BiOBr/Bi12GeO20 heterostructure exhibits the superior rate constant, which is about 7.73 times, 3.52 times and 1.66 times higher than that of the pure Bi12GeO20, BiOBr and I-BiOBr, respectively. Meanwhile, as we expected, the Z-scheme 30I-BiOBr/Bi12GeO20 heterostructure also displays the enhanced photocatalytic perfomance for degradation of Ciprofloxacin (CIP), 2-Mercaptobenzothiazole (MBT) and reduction of aqueous Cr(VI). The enhancement of photocatalytic performance is attributed to the high redox capacity and the strong interfacial interaction between I-BiOBr and Bi12GeO20, which can effectively improve the separation of photo-induced electron-hole pairs. Additionally, the photocatalytic mechanism over the Z-scheme I-BiOBr/Bi12GeO20 heterostructure is provided. The research work may provide a promising approach to fabricate other Z-scheme heterostructures with efficient photocatalytic performance.

10.
J Med Syst ; 43(7): 194, 2019 May 22.
Artigo em Inglês | MEDLINE | ID: mdl-31114956

RESUMO

3D/3D image registration in IGRT, which aligns planning Computed Tomography (CT) image set with on board Cone Beam CT (CBCT) image set in a short time with high accuracy, is still a challenge due to its high computational cost and complex anatomical structure of medical image. In order to overcome these difficulties, a new method is proposed which contains a coarse registration and a fine registration. For the coarse registration, a supervised regression convolutional neural networks (CNNs) is used to optimize the spatial variation by minimizing the loss when combine the CT images with the CBCT images. For the fine registration, intensity-based image registration is used to calculate the accurate spatial difference of the input image pairs. A coarse registration can get a rough result with a wide capture range in less than 0.5 s. Sequentially a fine registration can get accurate results in a reasonable short time. RSD-111 T chest phantom was used to test our new method. The set-up error was calculated in less than 10s in time scale, and was reduced to sub-millimeter level in spatial scale. The average residual errors in translation and rotation are within ±0.5 mm and ± 0.2°.


Assuntos
Planejamento da Radioterapia Assistida por Computador , Erros de Configuração em Radioterapia/prevenção & controle , Radioterapia Guiada por Imagem/métodos , Algoritmos , Humanos , Imageamento Tridimensional , Imagens de Fantasmas , Tomografia Computadorizada por Raios X
11.
J Colloid Interface Sci ; 547: 224-233, 2019 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-30954766

RESUMO

Precursor-reforming strategy induced graphitic carbon nitride (g-C3N4) with different morphologies for enhanced photocatalytic hydrogen (H2) evolution activity is highly desirable. Herein, g-C3N4 microtubes (mg-C3N4) with adjustable closure degree of microtube orifice and spatial anisotropic charge separation are established by conquering hydrogen bond during thermally exfoliate precursor. Compared to the bulk g-C3N4 (bg-C3N4) and ultrathin g-C3N4 (ug-C3N4), the tubular structure endows mg-C3N4 with spatial anisotropic charge separation that accelerates transfer of charge carriers. As expected, the photocatalytic H2 evolution (PHE) activity of mg-C3N4 has been obviously enhanced. Particularly, the mg-C3N4-24 shows the best PHE activity (957.9 µmol h-1 g-1), which is over 18.72 and 3.77 times higher than the bg-C3N4 and ug-C3N4, respectively. In addition, selective photo-deposition experiment results reveal a charge carriers migration behavior that photoproduction electrons migrate to the outer shell and holes prefer to move onto the inner shell of mg-C3N4, thus achieving efficient spatial anisotropic charge separation. We firmly believe that the work presents significant advancement for the design of other materials by precursor-reforming strategy.

12.
J Colloid Interface Sci ; 546: 262-275, 2019 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-30927592

RESUMO

It is very challenging to fabricate novel, high-efficiency photocatalysts with an enhanced visible light absorption capacity, high charge carrier separation efficiency, and large specific surface area. For this purpose, a yeast-derived carbon (YC) sphere was added as a charge carrier bridge to the 2D-2D Cu2WS4/g-C3N4 heterojunction through a facile hydrothermal method. The YC sphere, as a bridge for electrons, is not only advantageous in inhibiting rapid recombination by electrons, but also remarkably enhances the visible light absorption capacity. Moreover, the YC sphere can also increase the specific surface area and surface roughness, which can enhance the adsorption of pollutant molecules and provide abundant active sites for photocatalytic reactions. The g-C3N4/YC/Cu2WS4 heterojunction showed the best photocatalytic activity for reducing hexavalent chromium Cr(VI) and decomposing tetracycline (TC) under visible light. Meanwhile, the acute toxicity of Daphnia magna (D. magna) gradually decreases with the conversion of Cr(VI) to Cr(III) in solution. In addition, the possible intermediate products and the photocatalytic reaction mechanism are revealed in depth. This work provides a general example for improving the photocatalytic activity of 2D-2D based heterojunctions by introducing a biomass material.


Assuntos
Carbono/química , Cobre/química , Grafite/química , Compostos de Nitrogênio/química , Saccharomyces cerevisiae/química , Enxofre/química , Tungstênio/química , Catálise , Tamanho da Partícula , Processos Fotoquímicos , Propriedades de Superfície
13.
J Colloid Interface Sci ; 543: 317-327, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-30826526

RESUMO

A series of Z-scheme CdS/Bi12GeO20 heterostructures were successfully obtained by a simple hydrothermal method. The Z-scheme CdS/Bi12GeO20 heterostructures show outstanding photocatalytic performance for degrading the various organic pollutants of the waste water, and for the reduction of aqueous Cr(VI) under visible light. For degradation of 2-Mercaptobenzothiazole (MBT), the Z-scheme 30CdS/Bi12GeO20 heterostructure exhibits the superior rate constant, which is about 22.67 and 4.6 times higher than that of the pure Bi12GeO20 and CdS, respectively. Meanwhile, as we expected, the Z-scheme 30CdS/Bi12GeO20 heterostructure also displays the enhanced photocatalytic performance for degradation of Levofloxacin (LEV), Ciprofloxacin (CIP), Tetracycline (TC) and reduction of aqueous Cr(VI). The enhancement of photocatalytic performance is attributed to the high redox capacity and the strong interfacial interaction between CdS and Bi12GeO20, which can effectively improve the separation of photo-induced electron-hole pairs. Additionally, the photocatalytic mechanism over the Z-scheme CdS/Bi12GeO20 heterostructure is provided. The research work may provide a promising approach to fabricate other Z-scheme heterostructures with efficient photocatalytic performance.

14.
J Colloid Interface Sci ; 538: 462-473, 2019 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-30537659

RESUMO

It is still a challenging work to realize the universality of photocatalytic materials for unselective removing various organic pollutants in water. Here a surface dual-doped Cu/Cl-g-C3N4 photocatalyst is firstly prepared, which exhibits much more superior photocatalytic performance for degrading multifarious persistent organic pollutants including tetracycline hydrochloride (TC-HCl), o-chlorophenol, bisphenol A and 2-mercaptobenzothiazole in water than pure g-C3N4. The high-efficiency and unselective photocatalytic degradation performance derives from the surface dual-doped effect of Cu/Cl elements on g-C3N4, which results in the extended visible light harvest range, elevated CB potential and improved the separation efficiency of charge carriers. The intermediate products, degradation pathway, degree of mineralization and reaction mechanism of representative TC-HCl pollutant over the surface dual-doped Cu/Cl-g-C3N4 photocatalyst are revealed in depth. This work makes an important development for treating the persistent organic pollutants in the water environments by exploiting new, low-cost and high-efficiency photocatalytic materials.

15.
J Asian Nat Prod Res ; 21(2): 109-116, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29188722

RESUMO

Three new sesquiterpenes, methyl 4-isopropyl-7-methoxy-6-methylnaphthalene-1-carboxylate (1), methyl 2-hydroxy-4-isopropyl-7-methoxy-6-methylnaphthalene-1-carboxylate (2), and methyl 2-hydroxy-6-(hydroxymethyl)-4-isopropyl-7-methoxynaphthalene-1-carboxylate (3), together with three known sesquiterpenes (4-6), were isolated from the stems of Nicotiana tabacum. Their structures were determined by means of HRESIMS and extensive 1D and 2D NMR spectroscopic studies. The results showed that compounds 2, 3, and 5 exhibited high anti-TMV activity with inhibition rates of 33.6, 35.8, and 36.7%. Compounds 1-6 showed weak inhibitory activities against some tested human tumor cell lines (NB4, A549, SHSY5Y, PC3, and MCF7) with IC50 values in the range of 6.7-9.6 µM.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Sesquiterpenos/farmacologia , Tabaco/química , Antineoplásicos Fitogênicos/química , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Humanos , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Sesquiterpenos/química
16.
Zhongguo Zhong Yao Za Zhi ; 43(20): 4074-4076, 2018 Oct.
Artigo em Chinês | MEDLINE | ID: mdl-30486533

RESUMO

A new isobenzofuranone derivative has been isolated from Phlomis betonicoides by using various chromatographic techniques, including silica gel, Sephadex LH-20, MCI-gel resin and RP-HPLC. This compound was determined as 5-(3-hydroxypropyl)-2,2-dimethyl-2H-furo[3,4-h]chromen-7(9H)-one (1) by NMR, MS, IR and UV spectroscopic data. Compound 1 showed potent antibacterial activity with an MIC90 value of (58.4 ± 4.2) mg·L⁻¹ for methicillin resistant Staphylococcus aureus (MRSA) strain [levofloxacin as a control with MIC90 value of (52.8±4.6) mg·L⁻¹].


Assuntos
Antibacterianos/farmacologia , Benzofuranos/farmacologia , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Phlomis/química , Antibacterianos/isolamento & purificação , Benzofuranos/isolamento & purificação , Testes de Sensibilidade Microbiana , Compostos Fitoquímicos/isolamento & purificação , Compostos Fitoquímicos/farmacologia
17.
Lung Cancer ; 125: 109-114, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30429007

RESUMO

OBJECTIVES: Pulmonary granulomatous nodule (GN) with spiculated or lobulated appearance are indistinguishable from solid lung adenocarcinoma (SADC) based on CT morphological features, and partial false-positive findings on PET/CT. The objective of this study was to investigate the ability of quantitative CT radiomics for preoperatively differentiating solitary atypical GN from SADC. METHODS: 302 eligible patients (SADC = 209, GN = 93) were evaluated in this retrospective study and were divided into training (n = 211) and validation cohorts (n = 91). Radiomics features were extracted from plain and vein-phase CT images. The L1 regularized logistic regression model was used to identify the optimal radiomics features for construction of a radiomics model in differentiate solitary GN from SADC. The performance of the constructed radiomics model was evaluated using the area under curve (AUC) of receiver operating characteristic curve (ROC). RESULTS: 16.7% (35/209) of SADC were misdiagnosed as GN and 24.7% (23/93) of GN were misdiagnosed as lung cancer before surgery. The AUCs of combined radiomics and clinical risk factors were 0.935, 0.902, and 0.923 in the training cohort of plain radiomics(PR), vein radiomics, and plain and vein radiomics, and were 0.817, 0835, and 0.841 in the validation cohort of three models, respectively. PR combined with clinical risk factors (PRC) performed better than simple radiomics models (p < 0.05). The diagnostic accuracy of PRC in the total cohorts was similar to our radiologists (p ≥ 0.05). CONCLUSIONS: As a noninvasive method, PRC has the ability to identify SADC and GN with spiculation or lobulation.


Assuntos
Adenocarcinoma de Pulmão/patologia , Neoplasias Pulmonares/patologia , Nódulo Pulmonar Solitário/patologia , Área Sob a Curva , Feminino , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada com Tomografia por Emissão de Pósitrons/métodos , Curva ROC , Estudos Retrospectivos , Tomografia Computadorizada por Raios X/métodos
18.
Sci Rep ; 8(1): 14072, 2018 Sep 19.
Artigo em Inglês | MEDLINE | ID: mdl-30232370

RESUMO

We herein report the construction of a novel azo-linked conjugated microporous polymers (Ag@AzoTPE-CMP), which possesses permanent porous structure and Ag+ loading up of 7.62% in the skeleton as effective sorption sites. Ag@AzoTPE-CMP shows considerable adsorption capacity of iodine of 202 wt% in iodine vapor at 350 K. In addition, Ag@AzoTPE-CMP can effectively remove heavy ions from ethanol-water solution.

19.
Sci Rep ; 8(1): 14071, 2018 Sep 19.
Artigo em Inglês | MEDLINE | ID: mdl-30232393

RESUMO

A series of conjugated microporous polymers containing thiophene-moieties (SCMP-COOH@1-3) was obtained by a homo-coupling polymerization reaction. Then the SCMP-COOH@1-3 were directly pyrolyzed without any templates to synthesize the porous carbon networks, named as SCMP-600@1, 2 and 3. SCMP-600@1-3 possess moderate BET surface area of 362-642 m2 g-1, have a permanent porous structure and plenty of sulfur and oxygen units in the skeletons as effective sorption sites, and display a high absorption performance for iodine vapour with an uptake up to 204 wt.%. In addition, SCMP-COOH@1-3 polymers can be used to effectively detect mercury ion from ethanol-water solution. Interestingly, under the same concentration of Hg2+ conditions, the detection ability of mercury ion of porous materials increased with the increase of the pore volumes and the specific surface.

20.
J Colloid Interface Sci ; 531: 331-342, 2018 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-30048886

RESUMO

It is difficult for controlling the micro/nanostructures of composite unit on the surface of two-dimensional (2D) materials to fabricate the new high-efficiency photocatalysts. The mes-Fe3O4/g-C3N4 composite is fabricated by the modification of mesoporous Fe3O4 (mes-Fe3O4) nanospheres on the surface of 2D graphitic carbon nitride (g-C3N4) nanosheets. The mes-Fe3O4 nanospheres as the natural nanoreactors enlarge the specific surface area to increase reaction active sites, as well as provide the confined space to accelerate degradation reaction. Meanwhile, the physical and photoelectrochemical properties of mes-Fe3O4/g-C3N4 composite are distinctly improved owing to the electron collection effect of mes-Fe3O4 nanoreactors. The mes-Fe3O4/g-C3N4 composites exhibit the improved degradation performance for removing tetracycline hydrochloride (TC-HCl) relative to single g-C3N4. Moreover, the possible intermediate product and photocatalytic reaction mechanism are revealed in depth. This work gives a new guidance for the controlled fabrication of mesoporous nanoreactors on the surface of 2D materials.

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