作 者：
李文斌;邓红艳;李雪连;刘伟;雷刚刚;孟昭福;罗川;王腾
单 位：
西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室;西华师范大学环境科学与工程学院
关键词：
啤酒酵母菌;BS黏土;Cu2+;吸附量;阻滞
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-CaCK>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。
译 名：
Cu~(2+) adsorption and retardation effect of compound adsorbent by adding bacterium powder and amphoteric modified clay in active calcium silicate
作 者：
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;Department of Natural Resource and Environment, Northwest A&F University;Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture;
关键词：
Saccharomyces cerevisiae;;BS modified clay;;Cu2+;;adsorption amount;;retardation
摘 要：
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 of10 %, 20 %, and 50 % as the compound adsorbents(J-Ca and BS-Ca), and batch method was used to analyze the Cu2 +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 adsorption 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 and50%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 Cu2 +increased 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.
