摘要
以印染污泥为原料,在650℃无氧条件下热解制备了印染污泥基炭材料(DSC),并采用SEM、XPS、FT-IR和BET等手段表征了DSC的理化性质;将DSC应用于疏浚余水的深度处理,研究了DSC对疏浚余水中溶解性有机物质(DOM)的吸附特性,并结合吸附动力学模型解析其吸附过程;利用紫外-可见光谱(UV-VIS)、荧光光谱和高效体积排阻色谱(HPSEC)分析,探究疏浚余水中DOM的迁移转化规律。结果表明:印染污泥基炭在热解后获得了较大的比表面积和丰富的孔隙结构,吸附点位增多,且随着有机物的分解,印染污泥基炭表面C—H、C=O结合比降低、C—C、C—O结合比增加,芳香化程度增加,同时印染污泥基炭表面呈现高度疏水性,有利于吸附点位暴露;DSC对疏浚余水中DOM有良好的吸附性能,尤其是芳香类蛋白和富里酸类物质,其最大吸附量达18.53 mg/g;DSC对疏浚余水中DOM的吸附过程遵循准二级吸附动力学方程,以化学吸附为主;DSC对疏浚余水中DOM的吸附机理主要涉及孔隙填充、氢键结合、π-π共轭效应和疏水作用。该研究结果可为印染污泥后续资源化利用和降低疏浚余水的有机负荷提供依据。
Dyeing sludge-based carbon was prepared by pyrolysis at 650℃without oxygen using dyeing sludge as raw material,and then was applied to the adsorption of dissolved organic matter(DOM)in dredged residual water.SEM,XPS,FT-IR and BET were used to characterize the physical and chemical properties of dyeing sludge-based carbon.The adsorption characteristics of dyeing sludge-based carbon of DOM in dredged residual water was studied,and the adsorption process was analyzed with the adsorption kinetic model.UV-VIS,fluorescence spectroscopy,HPSEC were used to investigate the migration and transformation of DOM in dredged residual water.The results showed that larger specific surface area and abundant pore structure were obtained for dyeing sludge-based carbon after the pyrolysis,which increased adsorption sites.With the decomposition of organic matter,the C—H and C=O binding ratios on dyeing sludge-based carbon surface decreased,and the C—C and C—O binding ratios increased,increasing the aromatization degree.Meanwhile,the surface of DSM showed high hydrophobicity,which was conducive to the exposure of adsorption sites.Dyeing sludge-based carbon has good adsorption capacity for DOM,particularly aromatic proteins and fulvic-like components,with the maximum adsorption capacity up to 18.53 mg/g.The adsorption process of DSC to DOM followed the quasi-second-order kinetic equation,which was dominated by chemical adsorpation,and its adsorption mechanism mainly included pore filling,hydrogen bonding,π-π interaction and hydrophobic inter action.This study can provide basis for the subsequent resource utilization of dyeing sludge and the reduction of organic load of dredged residual water.
作者
吴金亮
何航
黄佳音
陈益人
张伟军
王东升
WU Jinliang;HE Hang;HUANG Jiayin;CHEN Yiren;ZHANG Weijun;WANG Dongsheng(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;Hubei Key Laboratory of Environmental Water Science in the Yangtze River Basin,China University of Geosciences(Wuan),Wuhan 430078,China;CCCC(Tianjin)Eco-Environmental Design and Research Institute Co.,Ltd.,Tianjin 300000,China;Safecleen Technologies Co.,Ltd,Wuhan 430206,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2022年第2期174-182,共9页
Safety and Environmental Engineering
基金
水体污染控制与治理科技重大专项项目(2018ZX07110004)
国家自然科学基金项目(51678546、41630318)。
关键词
印染污泥基炭
疏浚余水
热解炭化
吸附
溶解性有机质(DOM)
dyeing sludge-based carbon
dredged residual water
pyrolytic carbonation
adsorption
dissolved organic matter(DOM)
