化学改性大蒜茎叶对含Pb(Ⅱ)废水吸附的研究  

Research on the adsorption capacity of chemically modified garlic stems & leaves for Pb(Ⅱ)-containing wastewater

作　　者：周振[1] 周能[1] 黄祖强[2] 

机构地区：[1]广西农产品加工重点实验室培育基地、广西高校桂东南特色农产资源高效利用重点实验室、玉林师范学院化学与材料学院,广西玉林537000 [2]广西大学化学化工学院,广西南宁530004

出　　处：《工业水处理》2015年第3期26-29,共4页Industrial Water Treatment

基　　金：国家自然科学基金项目(81060360);广西科学基金(2010GXNSFA013065);广西千亿元产业重大科技攻关项目(桂科攻11107021-1-6);广西教育厅面上项目(YB2014308);玉林师范学院青年科研资助项目(2012YJQN02)

摘　　要：采用大蒜茎叶为原料,经异丙醇、氢氧化钠和柠檬酸处理,制备出改性吸附剂并用于吸附Pb(Ⅱ)的实验。考察了溶液酸度、吸附平衡时间、最大吸附量、固液比等因素对金属离子吸附平衡的影响。结果表明:改性剂柠檬酸最佳浓度为0.6 mol/L,最佳的制备温度是80℃。经柠檬酸改性的大蒜茎叶吸附剂对Pb2+的最佳吸附p H=5,在120 min内建立了反应平衡,对Pb2+的最大吸附量是119.62 mg/g。Modified adsorbent has b een prepared with garlic stems ＆ leaves as raw materials ,which were treated with C3H8O,NaOH,and C6H6O7·H2O,and has been applied to the adsorption for Pb （Ⅱ）. The influences of the factors,such as initial pH,adsorption equilibrium time,maximum adsorption capacity,solid/liquid ratio,etc. on the adsorption equilibrium of metal ions are investigated. The results show that the optimal concentration of modifier cit-ric acid is 0.6 mol/L,and optimal preparation temperature 80℃. The optimal conditions for adsorbing Pb2＋by the citric acid-modified garlic stems ＆ leaves adsorbent are as follows：pH is 5 and adsorption time within 120 min. Thus,the reaction equilibrium can be established and the maximum adsorbing capacity for Pb2＋is 119.62 mg/g.

关 键 词：大蒜茎叶 改性 铅 

分 类 号：X703.5[环境科学与工程—环境工程]