三维光电催化氧化对硝基苯酚的研究

Three-dimensional photoelectrochemical oxidation of p-nitrophenol

对硝基苯酚(p-NPh)类废水具有很强的"三致"性,可生物降解性差,在环境中长期滞留、富集会严重危害人类的健康。将自制的TiZnSn/AC粒子电极应用于光电体系下p-NPh模拟废水的降解研究,探究了粒子加量、p-NPh浓度、pH和电流密度对其处理效果的影响。据对硝基苯酚降解过程中COD值和紫外-可见吸收光谱的变化可知,在自由基等活性基团作用下,p-NPh经开环逐渐被氧化为小分子物质直至被全部降解。证明该粒子构成的三维光电催化体系对p-NPh有很好的降解能力。

P-nitrophenol-containing wastewater is of highly carcinogenic and poor biodegradability.Its long-term retention and enrichment in the environment will seriously endanger human health.A self-made TiZnSn/AC particle electrode is used to study the degradation of the simulated p-nitrophenol wastewater in photoelectric system.The influences of particle dosage,p-nitrophenol concentration,pH value and current density on the treatment efficiency and the degradation kinetics equation are investigated.The degradation process of p-nitrophenol is also studied.According to the changes of COD value and UV-Vis absorption spectrum during the degradation process,it is found that p-nitrophenol is gradually oxidized into small molecular substances through ring-opening under the action of free radicals and other active groups until they are completely degraded.It is proved that the three-dimensional photoelectrochemical system has good degradation ability to p-nitrophenol.