钛白石膏对重金属Pb(Ⅱ)的吸附特性研究  

Adsorption Characteristics of Heavy Metal Pb(Ⅱ) on Titanium Gypsum

作　　者：蔡宽[1,2] 阮长城[1,2] 李瑞萍[1,2] 黄应平[1,2] 

机构地区：[1]三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002 [2]三峡库区生态环境教育部工程研究中心,三峡大学,湖北宜昌443002

出　　处：《非金属矿》2014年第6期74-77,共4页Non-Metallic Mines

基　　金：国家高技术研究发展计划(863计划)(2012AA06A111-4)

摘　　要：利用工业废弃物钛白石膏作为吸附剂,研究了其对重金属Pb(II)的吸附特性。采用BET、XRD、SEM对钛白石膏进行了表征,研究了介质p H值、温度、接触时间、投加量以及离子强度对Pb(II)在钛白石膏上吸附特性的影响。结果表明,钛白石膏对Pb(II)的吸附速率较快,在70 min时就达到吸附平衡,去除率达到99.8%。升高温度和增大吸附剂的投加量,均有助于去除率的提高,表明该吸附过程为吸热反应,最适宜p H值为5.7左右。吸附动力学特征更符合准二级动力学模型,Langmuir等温模型可较好的拟合钛白石膏吸附Pb(II)的等温过程。The industrial waste titanium gypsum was used as a adsorbent to study adsorption characteristics of Pb（II）, which was characterized by BET specific surface area, scanning electron microscope（SEM） and X-ray diffraction（XRD） techniques. In this paper, The effects of initial pH value adsorbent dosage, contact time, temperature and ionic strength were investigated. The adsorption of Pb（II） on titanium gypsum is a quick process and reach equilibrium at 70 min, the removal rate is 99.8%. The removal rate increasing with the increasing of temperature and adsorbent dosage, The optimal pH value is about 5.7. The Adsorption data was well fitted the Langmuir isotherm model and the pseudo second-order kinetics model, the adsorption is a endothermic process.

关 键 词：钛白石膏 铅 吸附 吸附特性 

分 类 号：TQ177.375[化学工程—硅酸盐工业] X703[环境科学与工程—环境工程]