海藻酸钠改性铝污泥功能球吸附Cu(Ⅱ)的研究  

Adsorption copper ions from aqueous solution onto sodium alginate chemically modified aluminum sludge

作　　者：刘珊 张悦 田薪成 赵春朋 冯婷 魏莉 LIU Shan;ZHANG Yue;TIAN Xin-cheng;ZHAO Chun-peng;FENG Ting;WEI Li(College of Environmental Science and Engineering,Chang’an University,Key Laboratory of SubsurfaceHydrology and Ecological Effect in Arid Region of Ministry of Education,Xi’an 710054,China)

机构地区：[1]长安大学环境科学与工程学院旱区地下水文与生态效应教育部重点实验室

出　　处：《应用化工》2020年第1期11-16,共6页Applied Chemical Industry

基　　金：国家自然科学基金(51778057)

摘　　要：以铝污泥(AlS)和海藻酸钠(SA)为主要原材料,经过溶胶-凝胶法制备海藻酸钠改性铝污泥(SA-AlS)功能球,研究了温度、pH、初始浓度、吸附时间对Cu(II)吸附过程所产生的影响。结果表明,SA-AlS功能球在Cu(II)的吸附过程中最佳pH为5.5,吸附平衡时间为24 h,吸附过程为自发、吸热、熵增的过程,吸附等温线拟合结果表明,SA-AlS功能球对Cu(II)的吸附行为更符合Langmuir模型,表明该吸附过程主要涉及单层吸附;拟一级和拟二级动力学模型研究表明,该吸附过程与拟二级动力学模型更符合,故SA-AlS功能球对Cu(II)的吸附过程主要由化学吸附控制。吸附饱和的SA-AlS功能球可以用EDTA-2Na溶液很好地脱附,5次吸附-脱附后仍保持较好的吸附活性。SA-AlS functional beads was obtained by the aluminum sludge(AlS)and sodium alginate(SA),which was prepared by sol-gel process.The influence of temperature,pH,initial concentration and adsorption time on the Cu(II)adsorption process was investigated.The results showed that the SA-AlS functional beads had the optimum adsorption pH of 5.5;the adsorption equilibrium time was 24 h;and the adsorption of Cu(II)was spontaneous,endothermic,and entropic increasing process.The adsorption isotherm fitting results show that the adsorption behavior of SA-AlS functional beads to Cu(II)is more in line with the Langmuir,indicating that the adsorption process may was monolayer chemisorptions for Cu(II)ions;Quasi-first-order and quasi-second-order kinetics models show that SA-AlS functional beads to Cu(II)is more in line with the quasi-second-order kinetics models,indicating that the adsorption process may was chemical interactions for Cu(II)ions.The adsorption saturated SA-AlS functional beads can be removed by the EDTA-2Na solution,and the adsorption activity is still better after 5 sorption-removal.

关 键 词：铝污泥 海藻酸钠 SA-AlS功能球 CU(II) 吸附 

分 类 号：TQ424[化学工程] X52[环境科学与工程—环境工程]