| 摘要: |
| 【目的】研究两性表面修饰剂十二烷基甜菜碱(BS-12)和复配修饰剂β-环糊精(β-CD)复配修饰膨润土对苯酚的吸附性能，为有机物污染土壤的修复提供理论依据。【方法】在25 ℃下，采用批处理法，研究了膨润土原土对浓度为修饰比例25% CEC、50% CEC、75% CEC、100% CEC、125% CEC和150% CEC的BS-12，以及100% CEC的BS-12修饰膨润土对浓度为修饰比例25% CEC至150% CEC的β-CD的吸附特性；在此基础上，研究了膨润土原土、BS-12修饰膨润土、BS-12+β-CD复配修饰膨润土对苯酚的吸附量和吸附率。【结果】在25 ℃条件下，膨润土原土对BS-12的吸附率较高，在修饰比例为125% CEC时，BS-12吸附率达到96.97%；BS-12修饰膨润土对β-CD的吸附量随β-CD平衡浓度的增加先升高后降低,吸附率在100% CEC时最高，为30.37%。在苯酚平衡浓度相同时，不同修饰膨润土对苯酚的吸附量表现为BS-12修饰膨润土＞BS-12+β-CD复配修饰膨润土＞膨润土原土。【结论】两性表面修饰剂BS-12修饰膨润土对苯酚的吸附能力优于其他膨润土。 |
| 关键词: BS-12 β-环糊精 膨润土 苯酚 |
| DOI： |
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| 基金项目:国家自然科学基金项目(41271244)；陕西省社会发展攻关项目（2013K13-01-05）；陕西省农业科技攻关项目（2012K02-15） |
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| Preliminary research on bentonite modified by BS-12 and β-cyclodextrin complex and its phenol adsorption properties |
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REN Shuang,MA Lin-li,MENG Zhao-fu,et al
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| Abstract: |
| 【Objective】This experiment studied the phenol adsorption properties of amphoteric surfactants(BS-12) and BS-12+β-cyclodextrin complex modified bentonite to provided theoretical basis for remediation of organic contaminated soil.【Method】At 25 ℃,the adsorption properties and adsorption rates of bentonite original soil,bentonite mixed with BS-12 with concentrations from 25% CEC to 150% CEC and bentonite modified by 100% CEC BS-12 mixed with β-cyclodextrin with concentrations from 25% CEC to 150% CEC were studied based on batch method.Then the adsorption quantities and rates of original soil,bentonite modified by BS-12,and bentonite modified by complex of BS-12 and β-cyclodextrin to phenol were analyzed.【Result】At 25 ℃,bentonite original soil had high BS-12 adsorption ability with the adsorption rate of 96.97% at 125% CEC.The adsorption quantity of bentonite modified by BS-12 to β-cyclodextrin increased first and then decreased with the increase of β-cyclodextrin equilibrium concentration.The maximum adsorption rate was 30.37% at 100% CEC.At same equilibrium concentration of phenol,the absorption amounts were in the decreasing order of bentonite modified by BS-12>bentonite modified by complex of BS-12 and β-cyclodextrin>bentonite original soil.【Conclusion】Bentonite modified by amphoteric surfactant BS-12 had the best phenol adsorption ability. |
| Key words: BS-12 β-cyclodextrin bentonite phenol |
