聚羟基铝柱撑蛭石对废水中Sb(Ⅲ)的去除性能研究
Modern Chemical Industry(2023)
Abstract
采用铝的多聚物Al30对蛭石进行柱撑制备聚羟基铝柱撑蛭石(Al-VMT),考察初始pH、Al-VMT投加量、时间、温度等因素对去除Sb(Ⅲ)的影响.利用扫描电子显微镜、能谱仪、X射线衍射、X射线光电子能谱仪和傅里叶红外光谱仪对材料进行表征.该吸附过程符合拟二级动力学和颗粒内扩散模型,Langmuir和Freundlich吸附等温线模型均能很好地描述Al-VMT对Sb(Ⅲ)的吸附行为.结果表明,通过酸预处理以及聚羟基铝柱撑成功对蛭石进行了改性;Al-VMT对Sb(Ⅲ)的吸附机理主要包括静电吸附以及与羟基(—OH)的配位络合等;经过4次吸附-解吸循环后,Sb(Ⅲ)去除率仍达80%以上.
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Key words
adsorption,polymers,wastewater,pillared minerals,vermiculite,mechanism
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