菌粉、两性黏土复合活性硅酸钙对Cu<sup>2+</sup>的吸附和阻滞效应

李文斌; 邓红艳; 李雪连; 刘伟; 雷刚刚; 孟昭福; 罗川; 王腾

文章摘要

李文斌,邓红艳,李雪连,刘伟,雷刚刚,孟昭福,罗川,王腾.菌粉、两性黏土复合活性硅酸钙对Cu²⁺的吸附和阻滞效应[J].农业环境科学学报,2018,37(4):711-717.

菌粉、两性黏土复合活性硅酸钙对Cu²⁺的吸附和阻滞效应

Cu²⁺ adsorption and retardation effect of compound adsorbent by adding bacterium powder and amphoteric modified clay in active calcium silicate

投稿时间：2017-09-26

DOI：10.11654/jaes.2017-1478

中文关键词: 啤酒酵母菌 BS黏土 Cu²⁺ 吸附量阻滞

英文关键词: Saccharomyces cerevisiae BS modified clay Cu²⁺ adsorption amount retardation

基金项目:国家自然科学基金项目（41271244）；四川省教育厅科研项目（18ZB0576）

作者	单位
李文斌	西华师范大学环境科学与工程学院, 四川南充 637009
邓红艳	西华师范大学环境科学与工程学院, 四川南充 637009
李雪连	西华师范大学环境科学与工程学院, 四川南充 637009
刘伟	西北农林科技大学资源环境学院, 陕西杨凌 712100
雷刚刚	西华师范大学环境科学与工程学院, 四川南充 637009
孟昭福	西北农林科技大学资源环境学院, 陕西杨凌 712100 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100
罗川	西华师范大学环境科学与工程学院, 四川南充 637009
王腾	西北农林科技大学资源环境学院, 陕西杨凌 712100

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中文摘要:

为了探究菌粉、BS黏土复合硅酸钙材料对Cu²⁺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Cu²⁺的等温吸附特征，并采用运移模型验证两类复合材料对Cu²⁺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Cu²⁺的吸附能力逐渐降低，而BS-Ca材料对Cu²⁺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Cu²⁺的吸附量表现为BS-Ca > CK > J-Ca。两类复合材料对Cu²⁺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Cu²⁺的影响不大，而25% J-Ca和50% J-Ca对Cu²⁺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Cu²⁺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Cu²⁺的吸附量均有不同程度的增加。饱和水土柱运移试验中Cu²⁺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Cu²⁺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。

英文摘要:

To study the adsorption characteristics and retardation effects of Cu²⁺ 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 Cu²⁺ adsorption isotherms of the samples under different environmental conditions, such as under different pH and temperature values, also the Cu²⁺ retardation effects of the compound adsorbents were identified. The Cu²⁺ adsorption capacity of the J-Ca gradually decreased as the proportion of bacterium powder increased, whereas the adsorption of Cu²⁺ by the BS-Ca increased as the proportion of BS clay increased. The adsorption of Cu²⁺ 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 Cu²⁺ by the adsorbents was a spontaneous process that increased both enthalpy(except 50%BS-Ca) and entropy. Temperature had no significant effect on the Cu²⁺ 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 Cu²⁺ by the BS-Ca changed from positive effect to negative effect. In addition, the adsorption of Cu²⁺ 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. 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.

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