| 几种吸附剂对阿特拉津的吸附及其 Zeta 电位特性研究 |
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| 引用本文： | 尹敏敏,项 艳,司友斌,陈 涛.几种吸附剂对阿特拉津的吸附及其 Zeta 电位特性研究[J].土壤,2012,44(1):118-125. |
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| 作者姓名： | 尹敏敏 项 艳 司友斌 陈 涛 |
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| 作者单位： | 安徽农业大学资源与环境学院,合肥,230036 |
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| 基金项目： | 国家自然科学基金项目（40971182）和国家 863 计划项目（2006AA06Z356）资助 |
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| 摘 要： | 通过振荡吸附平衡试验,研究了蒙脱石、凹凸棒石、竹炭、木炭对阿特拉津的吸附行为,讨论了pH值、离子强度对吸附的影响,并考察了吸附剂表面的Zeta电位变化。结果表明,几种吸附剂对阿特拉津的吸附均符合Freundlich方程;竹炭、木炭的吸附能力明显高于蒙脱石和凹凸棒石。吸附剂对阿特拉津的吸附量随着悬液离子强度的增加而增加,在悬液pH一定(pH=6),离子强度为10-3mol/L NaNO3时,蒙脱石、凹凸棒石对阿特拉津的吸附量分别为538.30、609.68 mg/kg,当离子强度增加为10-2mol/L时,吸附量分别增至611.26、731.63 mg/kg;当离子强度由10-3增至10-1mol/L NaNO3时,竹炭、木炭对阿特拉津的吸附量有较多增加。当悬液pH在3~8范围时,几种吸附剂表面均带负电荷,其Zeta电位值随着pH的增加而增加,随离子强度的增加而减小。悬液离子强度一定时,随着pH的增加,吸附阿特拉津后吸附剂表面Zeta电位变化不显著。研究结果有助于从机理上解析吸附剂对有机污染物的吸附行为。
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| 关 键 词： | 阿特拉津 吸附剂 pH 离子强度 Zeta电位 |
Adsorption of several adsorbents onto atrazine and electrokinetic properties |
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| YIN Min-min,XIANG Yan,SI You-bin,CHEN Tao.Adsorption of several adsorbents onto atrazine and electrokinetic properties[J].Soils,2012,44(1):118-125. |
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| Authors: | YIN Min-min XIANG Yan SI You-bin CHEN Tao |
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| Institution: | School of Resources and Environment, Anhui Agricultural University |
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| Abstract: | The adsorption of atrazine onto montmorillonite, attapulgite, bamboo-charcoal and charcoal were studied by using adsorption equilibrium experiments, the effects of pH and ionic strength were investigated and the Zeta potential of these adsorbents were analysed. It showed that the adsorption of atrazine onto these adsorbents were well fitted by the Freundlich isotherm and bamboo-charcoal and charcoal had much higher adsorption capacity to atrazine than montmorillonite and attapulgite. The adsorption quantity of atrazine onto adsorbents increased with the increase of ionic strength of bulk solution, that was, it increased from 538.30 to 611.26 mg/kg and from 609.68 to 731.63 mg/kg when the ionic strength was increased from 10-3 to 10-2 mol/L NaNO3 for montmorillonite and attapulgite, respectively. However, the adsorption quantity dramatically increased from 1 439.89 to 1 714.29 mg/kg when the ionic strength was increased from 10-3 to 10-1 mol/L NaNO3 for bamboo-charcoal. As the pH of bulk solution ranging from 3 to 8, the Zeta potentials of montmorillonite, attapulgite, bamboo-charcoal and charcoal suspensions possessed a negative value, indicating the pHiep (isoelectric point) of the above adsorbents lower than 3. Meanwhile, the Zeta potentials became more negative with the increases of pH and decreases of ionic strengths of bulk solution. The results would be helpful to understand the adsorption mechanisms of organic pollutions onto adsorbents. |
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| Keywords: | Atrazine Adsorbents pH Ionic strength Zeta potential |
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