基于光热利用的金属有机骨架/石墨烯复合膜对印染废水的再生处理  

Recycling treatment of dyeing wastewater by metal organic framework/graphene composite membrane based on photothermal utilization

作　　者：李璟孜 娄蒙蒙 黄世燕 李方[1,2] LI Jingzi;LOU Mengmeng;HUANG Shiyan;LI Fang(College of Environmental Science and Engineering,Donghua University,Shanghai201620,China;Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection,Donghua University,Shanghai201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]东华大学国家环境保护纺织工业污染防治工程技术中心,上海201620

出　　处：《纺织学报》2023年第9期116-123,共8页Journal of Textile Research

基　　金：上海市科技创新行动计划项目(21DZ1209900);中央高校基本科研业务费专项资金资助项目(2232021G-11)。

摘　　要：为促进金属有机骨架(MOF)在印染废水处理中的应用,采用真空抽滤法制备了高性能金属有机骨架/石墨烯光热复合材料,通过界面蒸发方式对印染废水进行再生利用。利用扫描电子显微镜、X射线衍射仪和紫外-可见-近红外漫反射光谱仪等手段,对膜材料进行微观结构和光学性能的表征,研究了膜光热性能及废水光热蒸发性能。结果表明:沸石咪唑酯骨架材料ZIF-8改变了石墨烯微观构造并提高了光热转换效率,1个模拟太阳光下,膜表面温度升至97.6℃;印染废水再生处理结果显示,在1.0 kW/m^(2)的光照下,纯水的蒸发速率可达1.34 kg/(m^(2)·h),光热利用率为91.2%,对废水中有机污染物、色度及盐分的截留超过99.6%;复合膜性能稳定,重复使用7次后通量仍无明显降低。通过MOF简单地修饰石墨烯材料,显著提升了二维碳基材料的光热性能,具有较好的印染废水处理应用前景。Objective With the goal of reducing pollution and carbon,efficient and low-cost photothermal wastewater recycling technology has attracted more attention.Solar interfacial evaporation is considered a green and sustainable water treatment technology for treating wastewater by absorbing solar energy to convert light energy into heat energy.However,the photothermal efficiencies of most photothermal carbon materials are dissatisfactory.Therefore,in order to improve the photo-thermal utilization rate,a metal organic framework(MOF)/graphene photothermal composite material with good photothermal performance was prepared by a vacuum filtration method.The prepared material was used to treat dyeing wastewater and recycled pure water by interfacial evaporation.Method The graphene-based MOF material was prepared by in-situ growth method and deposited on a hydrophilic polyvinylidene difluoride(PVDF)based membrane surface as a photothermal layer to facilitate the evaporation of fresh water and rejection of pollutants.Because of the selectivity of the prepared G-ZIF membrane,only allowed water vapor was to pass through the membrane pores,and non-volatile organic matters were thus rejected.In addition,the microstructure and optical properties of the membrane materials were characterized,and the photothermal properties and wastewater evaporation performance were studied.Results The results showed that the graphene surface changed from a two-dimensional layer-layered structure to a three-dimensional regular polyhedral crystal structure after in-situ growth of ZIF-8,which nucleated uniformly on the graphene surface and tightly encapsulated flake graphene(Fig.1).According to the results of X-ray diffraction and Raman spectroscopy,ZIF-8 has been successfully loaded on the surface of graphene and has similar characteristic peaks to ZIF-8(Fig.2).The loading of ZIF-8 greatly increases the specific surface area of graphene up to 1096.50 m^(2)/g,thus providing more evaporation interfaces(Fig.4).Furthermore,the optical performance analysis

关 键 词：界面蒸发 石墨烯膜 金属有机骨架 印染废水 光热转换 光热材料 

分 类 号：TB34[一般工业技术—材料科学与工程] TS193.7[轻工技术与工程—纺织化学与染整工程]