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椭圆小球藻对汞的吸附-解吸探究 被引量:2

Study on Adsorption-desorption of Mercury by Chlorella ellipsoidea
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摘要 以椭圆小球藻(Chlorellaellipsoidea)为试验藻种,探究黑暗环境中活藻、死藻在不同条件下对水中汞的吸附-解吸特征、动力学过程和等温吸附模型。结果表明,椭圆小球藻在弱酸性或中性(pH=3~8)水环境中对汞的吸附能力最强,吸附总量随藻浓度的增加而增加,单位吸附量随藻浓度增加而降低,最佳吸附丰度约为3.2×10^6cells/mL,其中活藻处理对汞的最大吸附率为71.2%,死藻处理的最大吸附率为62.9%。椭圆小球藻对汞的吸附主要分为生物吸附和生物富集吸附两个阶段,其中死藻细胞主要以生物吸附为主,活藻细胞除了具备生物吸附以外还可进行生物富集吸附,藻细胞生物富集汞的能力与藻丰度和环境中汞浓度有关。二级动力学方程和Langmuir等温吸附模型可较好地描述椭圆小球藻对汞的吸附过程。在解吸汞的过程中,椭圆小球藻死藻解吸能力更强,活藻在解吸过程中伴随着生物富集,1440min后死藻和活藻均可达到解吸平衡。 In order to explore the adsorption-desorption characteristics of live and dead Chlorella ellipsoidea in Guizhou karst. Experi- ment in dark environment analysis it to mercury the optimum adsorption conditions,kinetic characteristics of Chlorella ellipsoidea adsorb mercury and isothermal adsorption model were analyzed as well. The experimental results showed that Chlorella ellipsoidea had strong adsorption capacity in weak acid or neutral (pH=3-8) water environment and the optimum adsorption concentration was 3. 2× 10^6 cells/mL. Total adsorption increased with the increment of Chlorella ellipsoidea’s abundance,but unit adsorption capacity decreased with the increasement of abundance. The maximum removal rate of live and dead algae were 71. 2% and 62. 9%,respectively. Chlorella ellipsoidea on mercury adsorption is mainly divided into biological adsorption and bioaccumulation in two stages,including the dead algae cells are mainly composed of biosorption,living algal cells except with biosorption biological enrichment can be adsorbed, algal cells biology of mercury enrichment ability related to algal abundance and mercury concentrations in the environment. Besides,the adsorption process conforms to the first-order and two-order kinetic models,and the two-order kinetic model had better fitting effect, better results were obtained of othermal adsorption model fitting by the Langmuir isotherm model. In the process of desorption of mercury,the decomposal ability of the elliptic chlorella is stronger and the living algae is accompanied by the biological enrichment during the desorption process,and the desorption equilibrium can be achieved by the dead algae and living algae after 1440 min.
作者 金林 孙荣国 莫雅斐 陈卓 范丽 李秋华 王丽萍 JIN Lin;SUN Rongguo;MO Yafei;CHEN Zhuo;FAN Li;LI Qiuhua;WANG Liping(College of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001)
出处 《地球与环境》 CAS CSCD 北大核心 2018年第6期599-605,共7页 Earth and Environment
基金 国家自然科学基金项目(41563012、21767007) 贵州省科技厅社会发展攻关项目(黔科合 LH 字[2017]7334) 中国博士后科学基金项目(2017M613005) 贵州省教育厅青年科技人才成长项目(黔教合 KY[2016]135) 贵州师范大学博士科研启动基金项目 贵州师范大学“省级大学生创新创业训练计划”项目(201710663071).
关键词 椭圆小球藻 吸附 解吸 Chlorella ellipsoidea mercury dsorption desorption
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