摘要：

金属有机框架（MOFs）作为非均相Fenton氧化法催化剂，在处理印染废水时难以多次利用、易引起二次污染。为解决此问题，通过多酚杂化网络涂层对聚丙烯熔喷无纺布（PP）表面进行改性，使其具有优异的黏附性和二次反应性，并在其表面原位生长MIL-88B（Fe）晶体，制备出金属有机框架聚丙烯熔喷复合材料（TA-APTES@MOF@PP）。利用亚甲基蓝染料（MB）作为目标污染物，测试复合材料的催化降解效果及回收利用性能，经单因素优化实验确定催化剂投放比例及最佳反应条件。结果表明，当染液pH为3，H₂O₂浓度为50 mmol/L时，TA-APTES@MOF@PP（MOF负载量为20 mg）在黑暗条件下对MB的降解效果在3 h时最佳，降解率达到95.3%。复合材料无二次污染、方便回收，有较好的稳定性、耐酸碱性，在染液pH为2~11范围内均具有催化效果，5次循环使用后3 h时MB的降解率仍在73.4%以上。该复合材料在印染废水处理和水环境治理领域具有广阔的应用前景。

关键词: 金属有机框架, 聚丙烯熔喷布, Fenton氧化, 印染废水

Abstract:

Metal organic frameworks(MOFs),as non-homogeneous Fenton oxidation catalysts,are difficult to be utilized multiple times and prone to secondary pollution in the treatment of printing and dyeing wastewater. To solve this problem, metal organic framework polypropylene melt blown composites (TA-APTES@MOF@PP) were prepared by modifying the surface of polypropylene melt blown nonwoven (PP) with polyphenol heterogeneous network coating, which resulted in excellent adhesion and secondary reactivity,and by in situ growth of MIL-88B (Fe) crystals on its surface. The catalytic degradation effect and recycling performance of the composites were tested with methylene blue dye (MB) as the target pollutant,and the catalyst delivery ratio and optimal reaction conditions were determined by single-factor optimization. The results showed that the degradation of MB by TA-APTES@MOF@PP (MOF 20 mg) under dark conditions was optimal at 3 h with a degradation rate of 95.3% when the pH of dye solution was 3 and the H₂O₂ concentration was 50 mmol/L. The composite material has no secondary pollution,easy to recycle, good stability, acid and alkali resistance, catalytic effect in the pH range of 2-11 of dying solution, and the 3 h degradation rate was still above 73.4% after 5 cycles. The composite material had a broad application prospect in printing and dyeing wastewater treatment and water environment management.

Key words: metal-organic framework, polypropylene melt blown cloth, Fenton oxidation, printing and dyeing wastewater

中图分类号: 

• X703.1