南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (2): 238.
薛 洁,彭建彪,焦昭钰,薛乐平,黄俊帆,高士祥*
Xue Jie,Peng Jianbiao,Jiao Zhaoyu,Xue Leping,Huang Junfan,Gao Shixiang*
摘要: 碳纳米管因其独特的物理化学性能和优异的电子传递特性使其成为众多研究工作者在研究高效催化剂及催化剂载体领域关注的热点.以常用消毒剂苄氯酚(CF)为新型污染物的代表,研究了羧基化多壁碳纳米管对类芬顿体系降解苄氯酚的作用,考察了pH、温度、Fe3+和H2O2浓度等对反应的影响.结果表明:在pH=4的条件下,适量的羧基化多壁碳纳米管可以提高苄氯酚的去除率,且去除率随着温度、Fe3+和H2O2浓度的增加而增加;当[Fe3+]=0.05 mmol·L-1,[H2O2]=1.0 mmol·L-1,[CF]=0.02 mmol·L-1,[MWCNTs-COOH]=4 ppm时,25 ℃条件下CF降解速率由不加碳纳米管时的0.0047 min-1增加到0.1029 min-1,提升了20多倍.通过自由基淬灭和电子顺磁共振技术来测定反应过程中的活性氧化物种,结果表明羟基自由基(·OH)为主要的活性氧化物种.最后,用飞行时间液相色谱质谱联用仪(TOF5600 LC-MS)检测到苄氯酚的三种羟基化中间产物.
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