改性膨润土对孔雀石绿的吸附研究  

The Study on Adsorption of Malachite Green by Modified Bentonite

作　　者：张君丽 于芳[1] 马同森 闵英豪[1] 周艳梅 

机构地区：[1]河南大学化学化工学院,河南开封475004 [2]河南大学棉花生物学国家重点实验室植物逆境生物学重点实验室,河南开封475004

出　　处：《河南大学学报（自然科学版）》2017年第6期708-714,共7页Journal of Henan University:Natural Science

基　　金：国家自然科学基金(21576071);河南省国际科技合作项目(152102410023)

摘　　要：膨润土为原料制备高效吸附剂去除水体中阳离子染料(孔雀石绿,MG).用勃姆石溶胶改性酸活化的膨润土(AB)得到改性膨润土(AB-BS),并通过FT-IR、XRD、SEM对其结构进行了表征.紫外光谱法用以考察AB和AB-BS对孔雀石绿的吸附情况,确定了最佳实验条件.实验表明AB和AB-BS均可高效地吸附孔雀石绿,最大吸附量分别为44.09和20.01mg·g^(-1).此外,吸附剂去除孔雀石绿符合Langmuir吸附模型,存在单层吸附,吸附动力学研究表明吸附行为遵循二级动力学模型.本工作研究结果说明AB和AB-BS在水体中去除孔雀石绿有一定的应用潜力.Bentonite was used as feedstock to prepare novel and effective adsorbents to remove cationic dye（malachite green,MG）from aqueous solutions.Modified bentonite（AB-BS）was synthesized by modified acidactivated bentonite（AB）with boehmite.The resulting modified bentonite was characterized with Fourier transform infrared spectroscopy（FT-IR）,Xray diffraction（XRD）and scanning electron microscopy（SEM）.The UV-visible spectrometry was employed to study on adsorption of MG on AB and AB-BS,which selected optimal experimental conditions.Experimental and modeling results show that both AB and AB-BS effectively sorbed both MG with maximum sorption capacity of 44.09 and 20.01 mg·g～（-1）,respectively.Moreover,monolayer adsorption of MG onto the adsorbents was revealed by a better fitting of the Langmuir model.Adsorption kinetic studies indicate that the adsorption behavior of MG follows the pseudo-second-order kinetic model.Results obtained from this work demonstrate the potential of AB and AB-BS adsorbent for the removal of MG from aqueous solutions.

关 键 词：膨润土 改性 吸附 孔雀石绿 

分 类 号：O656.2[理学—分析化学]