College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China.
Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, 438000, People's Republic of China.
Environ Sci Pollut Res Int. 2020 Nov;27(32):40857-40869. doi: 10.1007/s11356-020-09946-z. Epub 2020 Jul 16.
It is well-known that the degradation of pollutants in real water environment is not only challenging but also has practical value. This paper focuses on the photocatalytic degradation of thidiazuron (TDZ), a popular defoliant, using Ag/AgCl-AC (Ag@AC 2:1); AC stands for activated carbon) in a matrix of Yangtze River water under sunlight irradiation. The prepared composite catalyst exhibits excellent performance in TDZ degradation under near neutral condition, the degradation rate reaches 94% in 200 min under solar irradiation. The common inorganic anions (SO, Cl, and HCO) and cations (Ca, Cu, and Mg) show inhibitory effect of different degrees on TDZ degradation. Humic substances such as humic acid and fulvic acid also have an effect on the photocatalytic degradation of TDZ. With the increase of humic acid concentration, there is enhancement of inhibitory effect. As for fulvic acid, its effect is complex due to competitive adsorption and photoinduction action. The degradation products as identified by UHPLC-MS are mainly CO, SO, and HO, indicating that the degradation was thorough. The reusability test of four runs reveals that the performance of the photocatalytic system is stable. The results demonstrate that sunlight can be well utilized for the photocatalytic degradation of TDZ. The study offers a cheap and effective approach for the photocatalytic degradation of organic pollutants in circumneutral water bodies.
众所周知，实际水环境中污染物的降解不仅具有挑战性，而且具有实际价值。本文主要研究了在太阳光照射下，Ag/AgCl-AC（Ag@AC 2:1；AC 代表活性炭）在长江水中对噻苯隆（TDZ，一种流行的脱叶剂）的光催化降解。所制备的复合催化剂在近中性条件下对 TDZ 的降解表现出优异的性能，在 200 min 内的降解率达到 94%。常见的无机阴离子（SO、Cl 和 HCO）和阳离子（Ca、Cu 和 Mg）对 TDZ 的降解表现出不同程度的抑制作用。腐殖质物质，如腐殖酸和富里酸，也对 TDZ 的光催化降解有影响。随着腐殖酸浓度的增加，抑制作用增强。而对于富里酸，由于竞争吸附和光诱导作用，其效果较为复杂。通过 UHPLC-MS 鉴定的降解产物主要为 CO、SO 和 HO，表明降解较为彻底。四次重复使用测试表明，光催化体系的性能稳定。结果表明，太阳光可被有效用于 TDZ 的光催化降解。该研究为中性水体中有机污染物的光催化降解提供了一种廉价有效的方法。
