Isolation of an Acremonium sp. from a screening of 52 seawater fungal isolates and preliminary characterization of its growth conditions and nematicidal activity.

Fifty-two fungal isolates obtained from seawater were screened for anti-nematode activity. One isolate, an Acremonium sp., exhibited the highest activity against the pinewood nematode, Bursaphelenchus xylophilus. When it was grown at pH 7.0 and 24-26 °C, nematicidal metabolites were produced. These were heat-stable, water-soluble molecules with MWs <6 kDa. Nematicidal activity was highest at neutral pH.

Degradation of tetracycline by FeNi-LDH/Ti3C2 photo-Fenton system in water: From performance to mechanism.

Recently, photo-Fenton technology has been widely used to degrade tetracycline (TC) because of its great efficiency and wide application range. Herein, Fe-Ni layered double hydroxides (FeNi-LDH)/Ti3C2 photo-Fenton system was constructed in this study. The results showed the introduction of Ti3C2 solved some problems of FeNi-LDH such as poor conductivity, easy aggregation, and high recombination rate of photoelectron. Benefiting from these advantages, FeNi-LDH/Ti3C2 exhibited excellent TC removal rate of 94.7% while pure FeNi-LDH was only 54%. Besides, FeNi-LDH/Ti3C2 possessed strong pH tolerance (2-11) and the removal efficiency was still up to 82% after the four-cycle experiment. Furthermore, the quenching experiments revealed the reaction mechanism, where ∙OH and ·O2- were the primary active radicals for degrading TC. Last, the results of the simulated wastewater treatment and the inorganic ion interference tests showed that FeNi-LDH/Ti3C2 possessed practical application potential. In brief, this study shows that FeNi-LDH/Ti3C2 can offer a certain theoretical basis for the actual development of hydrotalcite in heterogeneous photo-Fenton systems.

Enhancing iron redox cycling for promoting heterogeneous Fenton performance: A review.

Conventional water treatment methods are difficult to remove stubborn pollutants emerging from surface water. Advanced oxidation processes (AOPs) can achieve a higher level of mineralization of stubborn pollutants. In recent years, the Fenton process for the degradation of pollutants as one of the most efficient ways has received more and more attention. While homogeneous catalysis is easy to produce sludge and the catalyst cannot be cycled. In contrast, heterogeneous Fenton-like reaction can get over these drawbacks and be used in a wider range. However, the reduction of Fe (III) to Fe(II) by hydrogen peroxide (H2O2) is still the speed limit step when generating reactive oxygen species (ROS) in heterogeneous Fenton system, which restricts the efficiency of the catalyst to degrade pollutants. Based on previous research, this article reviews the strategies to improve the iron redox cycle in heterogeneous Fenton system catalyzed by iron materials. Including introducing semiconductor, the modification with other elements, the application of carbon materials as carriers, the introduction of metal sulfides as co-catalysts, and the direct reduction with reducing substances. In addition, we also pay special attention to the influence of the inherent properties of iron materials on accelerating the iron redox cycle. We look forward that the strategy outlined in this article can provide readers with inspiration for constructing an efficient heterogeneous Fenton system.

Enhanced visible-light-driven photocatalytic activity of bismuth oxide via the decoration of titanium carbide quantum dots.

In Ti3C2 quantum dots (Ti3C2 QDs)/Bi2O3 photocatalysts system, Ti3C2 QDs can act as a co-catalyst to greatly boost the photocatalytic performance of Bi2O3. Ti3C2 QDs with excellent light adsorption ability can improve the light response of the system, and the fascinating electronic property can function as a channel for electron transfer. Moreover, Ti3C2 QDs possess larger specific area and more active edge atoms thanks to the size effect. The best Ti3C2 QDs/Bi2O3 composite with the loading amounts of 75 mL of Ti3C2 QDs solution showed much higher photocatalytic performance (nearly 5.85 times) for tetracycline (TC) degradation than that of pristine Bi2O3 under visible light irradiation. These different photocatalytic performances shed light on the key role of Ti3C2 QDs in stimulating the photocatalytic activity of Bi2O3. Moreover, Ti3C2 QDs/Bi2O3 composites exhibited excellent stability in recycling experiments and actual water sample treatment.