纳米TiO_2负载活性炭催化微波诱导快速降解甲基对硫磷的方法研究  

Study on the Method of Rapid Microwave-induced Degradation of Parathion-methyl Catalyzed by Nano-TiO_2-supported Activated Carbon

作　　者：张洪卫 刘丹妮[2] 徐瑶[2] 加娜尔古丽.加铁力 于凤洋[2] 李媛媛[2] 张朝红[2] 

机构地区：[1]铁岭县疾病预防控制中心,辽宁铁岭112000 [2]辽宁大学环境学院,沈阳110036

出　　处：《现代农药》2013年第3期36-40,共5页MODERN AGROCHEMICALS

基　　金：辽宁省自然科学基金(201202091);辽宁省教育厅自然科学基金(L2012006);辽宁省教育厅重点学科资助项目;辽宁省水环境生物监测与水生态安全重点实验室项目;辽宁环境科研教育"123工程"研究生科研教育基金(CEPF2009-123-2-10)

摘　　要：为了有效提高活性炭在微波诱导降解有机污染物中的催化活性,采用纳米二氧化钛负载活性炭结合微波照射技术(TiO2/AC/MW)对水中甲基对硫磷进行降解研究。结果表明:对总体积为25 mL、质量浓度为50 mg/L甲基对硫磷溶液,催化剂TiO2/AC质量浓度为0.8 g/L时,经微波照射1.0 min后,甲基对硫磷可降解85.8%。同样条件下,适当延长微波照射时间(2.5 min),降解率可达到100.0%。另外,采用UV-vis和离子色谱技术探讨了TiO2/AC中TiO2质量分数、微波照射时间、溶液初始质量浓度和催化剂质量浓度等因素对降解率的影响。TiO2/AC/MW技术具有降解率高、降解速度快、成本低、没有中间产物生成和无2次污染等优点,在甲基对硫磷废水处理中具有很好的应用前景。In order to effectively improve catalytic activity of activated carbon in microwave-induced degradation of organic pollutants, nano-sized TiO2 was supported on activated carbon and the degradation of parathion-methyl in aqueous solution under MW irradiation （TiO2/AC/MW） was studied. The degradation ratio of parathion-methyl could reach 85.8% for 25 mL solution with 50 mg/L parathion-methyl under 0.8 g/L TiO2/AC and 1.0 min MW irradiation. Under the same conditions, parathion-methyl could be degraded completely by prolonging irradiation time to 2.5 min. Also, the influences of the concentration of TiO2, the heat-treated time and temperature of the catalyst, MW irradiation time, initial concentration of parathion-methyl as well as the concentration of the catalyst on the degradation were discussed adopting UV-vis spectra and ion chromatography technology. The method using TiO2/AC/MW technology showed many advantages including high degradation ratio, rapid degradation, low cost and no secondary pollution. It was a promising technology for the treatment of parathion-methyl wastewaters.

关 键 词：纳米二氧化钛 负载 活性炭 微波 降解 甲基对硫磷 

分 类 号：X50[环境科学与工程—环境工程] O643.32[理学—物理化学]