纳米Cu_(2)O催化活化PMS氧化降解对硝基苯酚

Catalytic Oxide Degradation of p-nitrophenol by Nano-Cu_(2)O Activated Peroxymonosulfate

通过一锅合成法制备出均匀分散的Cu_(2)O纳米立方体催化剂,并作为活化过一硫酸盐(PMS)分解产生自由基氧化降解对硝基苯酚(PNP)反应的催化剂。研究结果表明,Cu_(2)O催化剂在60 min的反应时间内可将92%浓度为100 mg/L的PNP模拟废水降解,且催化剂稳定性良好可重复使用。本研究还对影响降解效果的因素进行了优化后得出结论:当溶液pH值调至4,反应温度控制在30℃,氧化剂PMS的浓度为15 mmol/L,低浓度的PNP废水在Cu_(2)O/PMS的催化体系中可以达到最佳的降解效果。通过淬灭实验与对反应机理进行的探究可以得出Cu_(2)O/PMS体系中起主导氧化作用的自由基是SO_(4)^(-)·。

We prepared well-dispersed Cu_(2)O nanocube catalysts material by one-pot method,the Cu_(2)O catalysts were used to activate peroxymonosulfate(PMS)to generate free radicals,which had excellent oxidizing ability to oxide and degrade p-nitrophenol.The results showed that Cu_(2)O catalysts remove 92%of 100 mg/L PNP wastewater within 60 min reaction time.The catalysts can be reused due to their great stability.The factors affecting the degradation performance has been optimized and concluded that best removal degradation of 100 mg/L was achieved in 60 min with 15 mmol/L PMS,303 K reaction temperature at pH 4.The quenching study showed that sulfate radical SO_(4)^(-)·is the major agent in the degradation of PNP.