【作者】 高聪； 全燮；

【Author】 Cong Gao;Xie Quan;Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education),School of Environmental Science and Technology,Dalian University of Technology;

【机构】 大连理工大学环境学院；

【摘要】 非均相Fenton技术是污水处理及环境修复的有效方法,但目前非均相催化剂催化活性较低限制其发展,开发高活性非均相Fenton催化剂对其应用及水污染处理发展是非常有意义的。本研究中将MIL-88B（Fe）应用到Fenton技术中,通过XRD、SEM、IR等表征表明采用水热法成功制备具有良好晶体结构及形貌的MIL-88B（Fe）。以苯酚作为目标污染物,考察了H2O2投加量,催化剂投加量及初始pH对苯酚降解效果的影响并确定苯酚降解过程中起主导作用的自由基。结果表明,对于浓度为50 ppm的苯酚溶液,0.15 g/L MIL-100（Fe）,15 m M H2O2在pH=4条件下30min内可以完全降解,苯酚降解效率随着pH升高呈现降低趋势,过量或少量H2O2及催化剂会抑制苯酚降解。MIL-88B（Fe）重复使用3次,其催化活性不发生明显变化。EPR表征表明MIL-88B（Fe）催化非均相Fenton体系中主要存在羟基自由基,羟基自由基猝灭剂实验证明·OH对苯酚降解起主导作用。对比常见非均相Fenton催化剂如α-Fe OOH及Fe₃O₄,结果显示Fe-MIL-88B催化活性高1-3个数量级,综上表明MIL-88B（Fe）是高催化活性及稳定性的新型非均相Fenton催化剂。更多还原

【Abstract】 Heterogeneous Fenton is an attractive technology in environmental remediation,however,the low activity of catalysts have limited their further application.In this work,MIL-88B（Fe） was applied in heterogeneous Fenton reaction for phenol degradation.XRD,SEM,IR and BET were used to characterize the as-prepared MIL-88B（Fe）.The effects of dosages of H2O2 and catalysts and initial pH value were evaluated.50 ppm phenol was completely removed by 0.15 g/L MIL-88B（Fe） and 15 m M H2O2 in 30 min at pH=4.The phenol removal decreased with increasing pH value,and inhibited with higher or lower dosages of H2O2 and MIL-88B（Fe）.EPR and radical scavenger tests showed ·OH was generated and played a key role in phenol degradation in MIL-88B（Fe） catalyzed Fenton reaction.In addition,MIL-88B（Fe） showed good stability（reused for 3 times without evident activity loss） and 1-3 orders higher catalytic activity than some traditional heterogeneous Fenton catalysts（Fe₃O₄,α-FeOOH）.更多还原