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作 者:邓红艳 蒋佳成 李文斌 陈芯怡 曾榆植 李婷 DENG Hongyan;JIANG Jiacheng;LI Wenbin;CHEN Xinyi;ZENG Yuzhi;LI Ting(College of Environmental Science and Engineering,China West Normal University,Nanchong 637009,China)
机构地区:[1]西华师范大学环境科学与工程学院
出 处:《环境科学与技术》2019年第10期101-107,共7页Environmental Science & Technology
基 金:国家自然科学基金项目(41271244);四川省科技厅项目(2018JY0224);西华师范大学科研启动基金项目(17E062)
摘 要:为了探究菌体-炭复合材料对废水中Cu2+的吸附性能,文章将生物炭(B)以共沉淀法制得磁化生物炭(MB),并将不同质量啤酒酵母菌(S)(0、10、20、40 g)分别负载于B和MB表面,形成了B+S0(生物炭+0 g啤酒酵母菌,下同)、B+S10、B+S20、B+S40、MB+S0(磁化生物炭+0 g啤酒酵母菌,下同)、MB+S10、MB+S20和MB+S408种混合材料。采用批处理法研究各复合材料对Cu2+的等温吸附和热力学特征,并分析不同温度、pH值和离子强度下对Cu2+吸附能力的影响。结果表明:(1)B+S和MB+S复合材料对Cu2+的最大吸附量qm分别在248.67~292.70 mmol/kg和256.50~299.11 mmol/kg之间,且最大吸附量均表现为B/MB+S40>B/MB+S0>B/MB+S20>B/MB+S10的趋势。(2)温度为10~40℃范围时,各复合材料对Cu^2+吸附量均随温度升高而增大,表现为增温效应。吸附过程均为自发、吸热和熵增的过程,且自发性和温度成正比。(3)在pH为3~5的范围内,B+S、MB+S材料对Cu^2+的吸附量均随pH的升高而增加;离子强度在0.01~0.5 mol/L范围内,2类复合材料对Cu^2+吸附量随着离子强度的增加均呈现先增加后减小的趋势。In order to investigate the adsorption properties of Cu2+by bacteria-carbon composites in wastewater,Saccharomyces cerevisiae(S)in different quality(0,10,20,40 g)were loaded on the surface of the biochar(B)and magnetized biochar(MB),respectively,which was prepared by coprecipitation method,to form eight mixed materials of B+S0(the biochar+0 g Saccharomyces cerevisiae,the same below),B+S10,B+S20,B+S40,MB+S0(the magnetized biochar+0 g Saccharomyces cerevisiae,the same below),MB+S10,MB+S20,MB+S40.The isothermic adsorption and thermodynamic characteristics of Cu^2+ were studied by batch method,and the effects of different temperatures,pH value and ionic strength on the adsorption capacity of Cu2+were analyzed.The results showed that the maximum adsorption amounts of Cu^2+ by B+S and MB+S composites were between 248.67~292.70 mmol/kg and 256.50~299.11 mmol/kg,respectively,and which were shown as the trend of B/MB+S40>B/MB+S0>B/MB+S20>B/MB+S10.When the temperature was in the range of 10~40℃,the adsorption amounts of Cu^2+ increased with the increase of temperature.The adsorption process was spontaneous,endothermic and entropy increase,and the spontaneity was proportional to temperature.Within the pH range of 3~5,the adsorption amounts of Cu^2+ on all materials increased with the increase of pH,and that increased at first and then decreased with the increase of ionic strength in the range of 0.01~0.5 mol/L.
分 类 号:X703[环境科学与工程—环境工程]
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