研究论文
司友斌,岳永德,曹德菊,陈怀满,周东美.苄嘧磺隆对Cu2+在粘土矿物上吸附-脱附的影响[J].环境科学学报,2001,21(5):587-591
苄嘧磺隆对Cu2+在粘土矿物上吸附-脱附的影响
- Effect of bensulfuron methyl on Cu~(2+) adsorption-desorption in clay minerals
- 基金项目：国家自然科学基金(29877001);中国科学院知识创新项目(KZCX2401)
- 作者
- 单位
- 司友斌
- 1. 安徽农业大学环境工程专业,合肥 230036; 2. 中国科学院南京土壤研究所,南京 210008
- 岳永德
- 安徽农业大学环境工程专业,合肥 230036
- 曹德菊
- 安徽农业大学环境工程专业,合肥 230036
- 陈怀满
- 中国科学院南京土壤研究所,南京 210008
- 周东美
- 中国科学院南京土壤研究所,南京 210008
- 摘要：选择两种粘土矿物Ca蒙脱石和高岭石作为吸附体,研究Cu2+的吸附脱附行为,以及苄嘧磺隆对Cu2+吸附脱附的影响.结果表明,Cu2+在比表面积、CEC大的Ca蒙脱石上吸附量较高;而在比表面积、CEC小的高岭石上吸附量较低.蒙脱石对Cu2+的吸附主要是静电吸附,吸附的Cu2+较易脱附;高岭石主要通过专性吸附机制而吸附Cu2+,吸附的Cu2+较难脱附.苄嘧磺隆对Cu2+在粘土矿物上吸附脱附的影响显著.苄嘧磺隆增加了Cu2+在Ca蒙脱石上的吸附,苄嘧磺隆作为桥而连接Ca蒙脱石和Cu2+,苄嘧磺隆的浓度越高,Cu2+的吸附量越大,解吸量越低.苄嘧磺隆对Cu2+在高岭石上吸附的影响,则是低pH值增加Cu2+吸附,高pH值时降低Cu2+吸附,解吸率的变化相反.
- Abstract：Cu2+ adsorption desorption in Ca montmorillonite and kaolinite in the presence and absence of bensulfuron methyl was studied. The results showed that Ca montmorillonite had higher adsorption capacity for Cu2+ than kaolinite because of its large CEC and surface area. The copperions(Ⅱ) adsorbed on Ca montmorillonite by electrostatics were more easily released than that on kaolinite by specific mechanism. Bensulfuron methyl markedly increased the adsorption of Cu2+ in Ca montmorillonite through “bridge” bonding with Ca montmorillonite and Cu2+ . The higher the concentration of bensulfuron methyl, the more the increase of Cu2+ adsorption in Ca montmorillonite, meanwhile, the lower the desorption rate of Cu2+ . Bensulfuron methyl also increased the adsorption of Cu2+ in kaolinite by means of complexing with Cu2+ ions when pH of media was low. However, bensulfuron methyl decreased Cu2+ adsorption in kaolinite through competing for the adsorption sites with Cu2+ ions in high pH.
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