分子筛催化剂-亚硫酸盐体系降解水中对乙酰氨基苯酚

过渡金属诱导亚硫酸盐体系产生硫氧自由基是一种新型的高级氧化技术,比常规的高级氧化过程(基于羟基自由基等)有更优越的性能.我们对过渡金属离子活化过硫酸盐和亚硫酸盐的硫氧自由基生成链式反应过程、自由基用于氧化有机污染物的国内外研究现状进行了大致总结,并以SBA-15介孔分子筛为载体,采用浸渍法制备Co-SBA-15固相催化剂,将此固相催化剂用于活化亚硫酸钠,产生强氧化性自由基,以此来降解制药废水中典型污染物对乙酰氨基酚(APAP).通过正交试验,探讨了pH、温度、钴离子与亚硫酸根的比值(简称钴硫比)、气体含氧量等参数对污染物降解效果的影响.对催化剂进行表征,对体系中产生的自由基类型进行检测,结合实验结果和文献资料对降解产物进行了分析,探究了APAP的降解原理.

Degradation of Acetaminophen in Water by Molecular Sieve Catalyst-Sulfite System

Sulfate radical based oxidant process activated by the transition metals in sulfite system is new advanced oxidation technology, which has better performance than the conventional advanced oxidation process (based on hydroxyl radical, etc.). Herein, sulfate radical generation chain reaction process was summarized. In addition, we summed up the experience of oxidizing organic pollutants researches using sulfate radicals. Further, the SBA-15 mesoporous molecular sieve was used as the carrier to prepare the Co-SBA-15 solid phase catalyst by impregnation method. This solid phase catalyst was used to activate sodium sulfite and generate strong oxidized free radicals to degrade the typical pollutant paracetamol (APAP) in pharmaceutical wastewater. Specifically, The effects of pH, temperature, the ratio of cobalt ions to sulfite (referred to as cobalt-sulfur ratio) and oxygen content on the degradation of pollutants were investigated by orthogonal test. The catalysts were characterized and the types of free radicals generated in the system were detected. The degradation byproducts were analyzed based on the experimental results and previous literatures, finally the degradation principle of APAP was investigated.