微波耦合类Fenton处理水中对硝基苯酚

Treatment of p-nitrophenol in water by Fenton-like reaction with microwave coupling

针对对硝基苯酚环境危害大、难生物降解的特点,为克服传统Fenton适用p H范围窄的缺点,制备了Cu O催化剂,并对微波耦合类Fenton氧化对硝基苯酚溶液进行了实验研究,考察了H2O2投加量、催化剂投加量、微波功率、辐照时间、溶液初始p H对PNP去除效果的影响.结果表明,在H2O2和催化剂投加量分别为0.06mol/L和0.3g/L,微波功率125W,不调节溶液初始p H(约为6)的条件下,初始浓度为50mg/L的PNP溶液反应6min去除率达92%,TOC去除63%.比较不同氧化体系,得到微波能够增大微波耦合类Fenton体系中?OH的生成量,从而提高对PNP的去除率.实验表明,Cu O催化微波耦合类Fenton作为一种新型类Fenton反应,能克服传统Fenton适用p H范围窄的局限性,并且显著提高反应效率,拓展了Fenton反应在废水处理中的应用.

In order to avoid the narrow pH range in the traditional Fenton process, the CuO catalyst was synthesized and used in the microwave-assisted Fenton-like process to remove the p-Nitrophenol （PNP）, which is harmful to the environment and difficultly biodegradable. The effects of the H2O2 dosage, CuO dosage, microwave power, irradiation time, and initial pH on the degradation of PNP were investigated in detail. The optimal values of operating parameters were found at a H2O2 concentration of 0.06mol/L, a CuO concentration of 0.3g/L, a microwave power of 125W, and a pH of about 6without adjusting the initial pH. Under the optimal conditions, the removal efficient of PNP reached 92%and the TOC removal was 63%after 6min of irradiation when the initial concentration of PNP was 50mg/L. Compared with the other oxidation processes, the microwave can enhance the ＆#183;OH production from the Fenton-like process, resulting in the improved removal efficiency of PNP. As a new kind of Fenton-like process, the microwave-assisted one using the CuO catalyst can overcome the limitation of the narrow pH range in the traditional Fenton reaction, and broaden the application of the Fenton process in wastewater treatment.