玉米秸秆生物炭对重金属镉、铅的吸附性能
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摘要
利用玉米秸秆制备生物炭,进行吸附重金属Cd~(2+)和Pb~(2+)试验,分析生物炭吸附重金属的吸附量及吸附效率.试验结果表明:Cd~(2+)的最优吸附条件是pH为5,120 min吸附平衡.Pb~(2+)的最优吸附条件是pH为1,60 min吸附平衡;生物炭对养殖废水中Pb~(2+)和Cd~(2+)具有较好的吸附效果,吸附去除率分别为85%和98%,生物炭对Pb~(2+)的吸附效果明显优于Cd~(2+);Cd~(2+)和Pb~(2+)在秸秆生物炭表面上的吸附过程符合Freundlich等温吸附模型.
Preparation of biochar using maize straw and adsorption of heavy metal Cd~(2+),Pb~(2+)as adsorbents,the adsorption capacity and adsorption efficiency of heavy metals adsorbed on biochar were analyzed and evaluated.The pH of Cd~(2+)optimal adsorption conditions was 5,adsorption equilibrium time was 120 min and pH of Pb~(2+)optimal adsorption conditions was 1,adsorption equilibrium time was 60 min. Biochar has an excellent effect on adsorption of Cd~(2+),Pb~(2+)in aquaculture wastewater. The degradation rate of adsorption was 85%,98%respectively. The adsorption effect of Pb~(2+)is obviously better than that of Cd~(2+). The adsorption processes of Cd~(2+),Pb~(2+)on the surface of straw biochar is fit to the Freundlich adsorption model.
Preparation of biochar using maize straw and adsorption of heavy metal Cd~(2+),Pb~(2+)as adsorbents,the adsorption capacity and adsorption efficiency of heavy metals adsorbed on biochar were analyzed and evaluated.The pH of Cd~(2+)optimal adsorption conditions was 5,adsorption equilibrium time was 120 min and pH of Pb~(2+)optimal adsorption conditions was 1,adsorption equilibrium time was 60 min. Biochar has an excellent effect on adsorption of Cd~(2+),Pb~(2+)in aquaculture wastewater. The degradation rate of adsorption was 85%,98%respectively. The adsorption effect of Pb~(2+)is obviously better than that of Cd~(2+). The adsorption processes of Cd~(2+),Pb~(2+)on the surface of straw biochar is fit to the Freundlich adsorption model.
引文
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[3]Dragan E S,Dinu M V.Removal of copper ions from aqueous solution by adsorption on ionic hybrids based on chitosan and clinoptilolite[J].Ion Exchange Letters,2009(2):15-18.
[4]刘辉,邹继颖,孙大志,等.生物吸附剂-Fenton试剂法处理垃圾渗滤液中的COD[J].桂林理工大学学报,2016,36(4):778-780.
[5]谢文平,余德光,郑光明,等.珠江三角洲养殖鱼塘水体中重金属污染特征和评估[J].生态环境学报,2014,23(4):636-641.
[6]马亚楠.新疆阿克苏和伊犁地区肉牛产地土壤、水和饲料中重金属含量的测定研究[D].乌鲁木齐:新疆农业大学,2013.
[7]杜卫莉.我国南方养猪业污染现状监测分析[J].广东化工,2016,43(3):86-88,83.
[8]杨慧敏,李云桂,孙权,等.颗粒粒径对玉米秸秆生物碳吸附锶的影响[J].环境科学学报,2017,37(6):2190-2202.
[9]Bolan N S,Choppala G,Kunhikrishnan A,et al.Microbial transformation of trace elements in soils in relation to bioavailability and remediation[J].Reviews of Environmental Contamination and Toxicology,2013,225:1-56.
[10]Hsu N H,Wang S L,Lin Y C,et al.Reduction of Cr(VI)by crop-residue-derived black carbon[J].Environmental Science and Technology,2009,43(23):8801-8806.
[11]李瑞月,陈德,李恋卿,等.不同作物秸秆生物碳对溶液中Pb2+、Cu2+的吸附[J].农业环境科学学报,2015,34(5):1001-1008.
[12]刘丽杰,王玥,金忠民,等.车前草对重金属Cd2+的积累及生理响应[J].黑龙江畜牧兽医,2016(15):15-19.
[13]李力,陆宇超,刘娅,等.玉米秸秆生物炭对Cd(Ⅱ)的吸附机理研究[J].农业环境科学学报2012,31(11):2277-2283.
[14]邹继颖,刘辉.生物吸附剂对重金属Cr(Ⅵ)吸附性能的研究[J].环境工程,2014,32(2):64-67.