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Cu2+和Pb2+在BS-12两性修饰膨润土上的吸附及其交互作用
摘要点击 1666  全文点击 518  投稿时间:2019-04-10  修订日期:2019-05-15
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中文关键词  两性修饰  吸附  交互作用    
英文关键词  amphoteric modification  adsorption  interaction  copper  lead
作者单位E-mail
卜帅宾 西北农林科技大学资源环境学院, 杨凌 712100 15591092116@163.com 
孟昭福 西北农林科技大学资源环境学院, 杨凌 712100
农业部西北植物营养与农业环境重点实验室, 杨凌 712100 
zfmeng1996@263.net 
Sambath Yek 西北农林科技大学资源环境学院, 杨凌 712100  
张梦飞 西北农林科技大学资源环境学院, 杨凌 712100  
王腾 西北农林科技大学资源环境学院, 杨凌 712100  
任爽 西北农林科技大学资源环境学院, 杨凌 712100  
张凌恺 西北农林科技大学资源环境学院, 杨凌 712100  
中文摘要
      两性表面修饰可以同时提高黏土矿物对有机物、重金属的吸附性能,研究两性修饰土对多种重金属共存条件下的吸附及交互作用对于其应用具有实际意义.采用红外光谱(FTIR)对膨润土(CK)和150BS-12修饰土(150BS-12)吸附金属离子前后进行表征,通过批处理法研究不同比例BS-12修饰膨润土对Cu2+和Pb2+在单一及Cu-Pb复合体系中的平衡吸附特征和差异,并探讨金属离子在修饰土样上的交互作用机制.结果表明,供试土样在单一及复合体系中对Cu2+和Pb2+的吸附量均呈150BS-12 > 100BS-12 > 50BS-12 > CK的顺序,吸附均符合Freundlich和Langmuir模型;BS-12修饰更有利于Cu2+的吸附,但Pb2+在BS-12修饰土样上的吸附量及选择性系数均大于Cu2+;Cu-Pb复合体系中,两种金属离子存在相互拮抗的作用,BS-12修饰在减弱Pb2+对Cu2+的拮抗作用的同时增强了Cu2+对Pb2+的拮抗作用,但Pb2+对Cu2+的拮抗作用仍大于Cu2+对Pb2+的拮抗作用;温度升高、pH升高和离子强度降低均能增加对Cu2+和Pb2+的吸附,但其对两种金属离子的影响程度不同,也导致对金属离子间的交互作用产生影响.
英文摘要
      Amphoteric modification can simultaneously improve the adsorption of organic pollutants and heavy metals on clay minerals. Study of the adsorption and interaction of multiple heavy metals on amphoteric modified soils is therefore of practical significance. Here, bentonite-(CK) and 150BS-12-modified bentonites (150BS-12) were characterized both before and after metal ion adsorption using Fourier-transform infrared spectroscopy (FTIR). The equilibrium adsorption characteristics and differences of Cu2+ and Pb2+ in single and binary systems were studied by batch methods. The interaction mechanism of the metals on modified bentonites is also discussed. The results showed that the adsorption capacity of Cu2+ and Pb2+ in single and binary systems was ranked, in descending order, as 150BS-12 > 100BS-12 > 50BS-12 > CK, and that the adsorption isotherm could be described by the Langmuir and Freundlich equations. Although the modification of BS-12 was more beneficial for the adsorption of Cu2+, the adsorption capacity and selectivity coefficient of Pb2+ on BS-12-modified bentonites were larger than for Cu2+. Cu2+ and Pb2+ had a mutually antagonistic effect on each other; modification with BS-12 enhanced the effect of Cu2+ on Pb2+ and weakened the effect of Pb2+ on Cu2+, which was always stronger than the effect of Cu2+ on Pb2+. Increases in temperature and pH, and a reduction in ionic strength, can increase the adsorption of Cu2+ and Pb2+; however, the influence of these factors varied between the two metals, which also affected the interaction between the metals.

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