摘要
为实现对废水中Cr(Ⅵ)的高效去除,利用PA(植酸)掺杂PANI(聚苯胺)制备了一种新型三维多孔吸附剂PANI PA,探究PA的掺杂浓度、pH、反应时间、反应温度、共存金属离子和无机阴离子对Cr(Ⅵ)去除率的影响.首先,采用SEM、FTIR、XPS等表征手段证实PA成功掺杂到PANI上形成三维多孔结构,并进一步利用吸附动力学、吸附等温线、吸附热力学模型分析PANI PA对Cr(Ⅵ)的吸附特性.结果表明:①0.05 mol L PA掺杂的吸附材料具有最优吸附效果.当pH为4.0时,吸附剂可以实现对Cr(Ⅵ)最有效的去除.②吸附动力学符合准二级动力学模型,表明化学吸附是控制反应速率的主要因素.Langmuir等温吸附模型对等温吸附过程实现较准确拟合,在318 K时达最大吸附容量(99.0 mg g),优于普通PANI吸附剂.③吸附机理主要是表面静电吸附、络合作用和还原作用.④在其他金属离子和无机阴离子共存下,PANI PA对Cr(Ⅵ)具有较强的选择吸附性.研究显示,PANI PA吸附材料成功制备并具有稳定结构,能够对水中Cr(Ⅵ)实现有效去除,并具有较强的选择吸附性,因此对废水中Cr(Ⅵ)的去除具有潜在的应用价值.
In order to efficiently remove hexavalent chromium(Cr(Ⅵ))in wastewater,a new three-dimensional porous polyaniline adsorbent PANI PA was prepared using phytic acid(PA)doped polyaniline(PANI)in this study.Batch adsorption experiments were conducted to study the effect of PA doping concentration,pH,reaction time,reaction temperature,and coexisting metal ions and inorganic anions on Cr(Ⅵ)adsorption by PANI PA.Scanning electron microscope(SEM),flourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS)were used to identify that PA was successfully doped on PANI and a three-dimensional porous structure was formed.The characteristics of Cr(Ⅵ)adsorption by PANI PA were explored using adsorption kinetics,adsorption isothermal model,and adsorption thermodynamics.The results showed that:(1)The PANI doped with 0.05 mol L PA had the optimal adsorption performance;the highest removal rate of Cr(Ⅵ)was obtained at pH=4.0.(2)The pseudo-secondary kinetic model was suitable to fit the adsorption process,indicating that chemisorption mainly controlled the reaction rate.The adsorption isotherm was well fitted by the Langmuir adsorption isothermal model,and the maximum adsorption capacity was 99.0 mg g at 318 K.(3)The adsorption mechanisms were surface electrostatic adsorption,complexation reaction,and reduction reaction.(4)The selective adsorption capacity of PANI PA for Cr(Ⅵ)was high in the presence of other metal ions and inorganic anions.The study demonstrated that the PANI PA was successfully prepared and had a stable structure,and it can effectively remove Cr(Ⅵ)in water and has strong selective adsorption for Cr(Ⅵ).Thus,PANI PA has potential application value for the treatment of Cr(Ⅵ)in wastewater.
作者
魏治洋
邹飞林
赖竹林
刘骋
刘畅
刘晓薇
WEI Zhiyang;ZOU Feilin;LAI Zhulin;LIU Cheng;LIU Chang;LIU Xiaowei(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes,Hefei University of Technology,Hefei 230009,China;School of Environmental Science and Engineering,Anhui Normal University,Wuhu 241000,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2021年第2期337-345,共9页
Research of Environmental Sciences
基金
大学生国家级创新创业训练项目(No.201810359078)
国家自然科学基金项目(No.51609058)
安徽省自然科学基金项目青年基金项目(No.1808085QD106)。
