摘要
为了探究菌粉、BS黏土复合硅酸钙材料对Cu^(2+)的吸附特征及阻滞效果,分别将啤酒酵母菌粉和100%CEC的BS-12(十二烷基二甲基甜菜碱)修饰膨润土以质量比10%、25%和50%与硅酸钙(CK)组配,形成J-Ca(菌粉+硅酸钙)和BS-Ca(BS黏土+硅酸钙)两类复合材料。批处理法研究不同pH值和温度条件下复合材料对Cu^(2+)的等温吸附特征,并采用运移模型验证两类复合材料对Cu^(2+)的阻滞效应。结果表明,随着菌粉添加比例的增加,J-Ca材料对Cu^(2+)的吸附能力逐渐降低,而BS-Ca材料对Cu^(2+)的吸附量随BS黏土添加比例的增加而增大;相同菌粉和BS黏土添加比例下,复合吸附剂对Cu^(2+)的吸附量表现为BS-Ca>CK>J-Ca。两类复合材料对Cu^(2+)的吸附是一个自发、吸热(50%BS-Ca除外)和熵增的反应过程。10~30℃范围内,温度对CK和10%J-Ca吸附Cu^(2+)的影响不大,而25%J-Ca和50%J-Ca对Cu^(2+)的吸附量在不同温度处理下差异显著;当BS黏土添加比例达到50%时,BS-Ca吸附Cu^(2+)的温度效应开始从增温正效应向增温负效应转变。随着溶液pH值的升高,两类材料对Cu^(2+)的吸附量均有不同程度的增加。饱和水土柱运移试验中Cu^(2+)穿透的体积数表现为25%J-Ca<CK<25%BS-Ca,出流浓度峰值表现为25%J-Ca>CK>25%BS-Ca;CK、25%J-Ca和25%BS-Ca对Cu^(2+)的吸附率均达到了95%以上,且阻滞因子显示出25%BS-Ca>CK>25%J-Ca。
To study the adsorption characteristics and retardation effects of Cu^2＋ under different compound adsorbents mixed by bacterium powder, BS（BS-12, dodecyl dimethyl betaine） modified clay and active calcium silicate, Saccharomyces cerevisiae and BS-modified bentonite （Bentonite modified by modified ratio of 100% CEC of Bentonite） were mixed in active calcium silicate （CK）, with a mass ratio of 10%, 20%, and 50% as the compound adsorbents（J-Ca and BS-Ca）, and batch method was used to analyze the Cu^2＋ adsorption isotherms of the samples under different environmental conditions, such as under different pH and temperature values, also the Cu^2＋ retardation effects of the compound adsorbents were identified. The Cu^2＋ adsorption capacity of the J-Ca gradually decreased as the proportion of bacterium powder increased, whereas the adsorption of Cu^2＋ by the BS-Ca increased as the proportion of BS clay increased. The adsorption of Cu^2＋ by the J-Ca and BS-Ca in the same proportion of bacterium powder and BS clay decreased as follows ： BS-Ca〉CK〉J-Ca. The ad- sorption of Cu^2＋ by the adsorbents was a spontaneous process that increased both enthalpy（except 50%BS-Ca） and entropy. Temperature had no significant effect on the Cu^2＋ adsorption of either the CK or the 10%J-Ca at 10-30 ℃ but did significantly affect the 25%J-Ca and 50%J-Ca. As the proportion of BS clay increased to 50%, the effect of temperature on the adsorption of Cu^2＋ by the BS-Ca changed from positive effect to negative effect. In addition, the adsorption of Cu^2＋ by the two materials increased with increasing pH. （3） In the saturated soil and column migration tests, the volume of penetrated Cu^2＋ increased as follows：25%J-Ca〈CK〈25%BS-Ca. Meanwhile, the outflow concentration peak decreased as follows：25%J-Ca〉CK〉25%BS-Ca. The adsorption rate of the CK, 25%J-Ca, and 25%BS-Ca were all above 95%, and the relative retardation factors of the materials were as follows：25%BS-Ca〉CK〉25%J-Ca.
作者
李文斌
邓红艳
李雪连
刘伟
雷刚刚
孟昭福
罗川
王腾
LI Wen-bin;DENG Hong-yan;LI Xue-lian;LIU Wei;LEI Gang-gang;MENG Zhao-fu;LUO Chuan;WANG Teng(College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China;Department of Natural Resource and Environment, Northwest A＆F University, Yangling 712100, China;Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2018年第4期711-717,共7页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41271244)
四川省教育厅科研项目(18ZB0576)~~
关键词
啤酒酵母菌
BS黏土
CU2+
吸附量
阻滞
Saccharomyces cerevisiae
BS modified clay
Cu^2＋
adsorption amount
retardation
