多胺基功能化SBA-15材料对Cd(Ⅱ)的吸附  

Adsorption of Cd(Ⅱ) on Polyamino-functionalized SBA-15 Material

作　　者：张春华[1] 陈满生[1] 许金生[1] 易正戟[1] 李薇[1] 匡云飞[1] 

机构地区：[1]f衡阳师范学院化学与材料科学系 功能金属有机材料湖南省普通高等学校重点实验室,湖南衡阳421008

出　　处：《过程工程学报》2014年第4期677-682,共6页The Chinese Journal of Process Engineering

基　　金：湖南省科技计划重点资助项目(编号:2012FJ2002);湖南省环保厅2013年环保科技项目;湖南省高校重点实验室开放基金资助(编号:13K06)

摘　　要：以正硅酸乙酯为硅源、三嵌段聚合物P123为模板剂,采用水热-后合成方法制备三胺基改性的多孔二氧化硅(3N-SBA-15)吸附剂,对其结构进行表征,并考察了吸附时间、体系初始pH值、吸附剂用量和温度等因素对水溶液中Cd2+吸附的影响.结果表明,三胺基改性可显著增强SBA-15对Cd2+的吸附能力,在pH=4.5、40℃、反应时间90min的条件下,最大吸附容量为1.05 mmol/g.Langmuir方程可较好地描述Cd2+在3N-SBA-15上的吸附平衡,20,30和40℃下最大吸附容量分别为0.93,0.97和1.05 mmol/g;热力学参数表明此吸附过程为自发吸热过程.对其吸附机理和材料的再生也进行了探索.The triamino-modified porous SBA-15 （3N-SBA-15） adsorbent was prepared by posting-graft hydrothermal synthesis with Pluronic P123 as template agent and tetraethyl orthosilicate as the silicon source, and characterized. The effects of experimental conditions such as contact time, pH value, initial Cd2＋ concentration and temperature on the adsorption were studied. The adsorptive results showed that the adsorption equilibrium well fitted to Langmuir equation, the maximum adsorption capacity of Cd2＋ onto 3N-SBA-15 was 0.93 at 20 ℃, 0.97 at 30℃ and 1.05 mmol/g at 40℃. And the adsorption equilibrium reached within 90 min when 150 mg/L adsorbent was added into 50 mL solution containing of 100 mg/L Cd2＋ at pH 4.5, the maximum adsorption capacity of 3N-SBA-15 was 1.05 mmol/g. The thermodynamic analysis indicated that the adsorption was a spontaneous and endothermic process. Moreover, its adsorption mechanism and regeneration of 3N-SBA-15 were also explored.

关 键 词：多胺基 吸附 镉离子 热力学 硅酸乙酯 三嵌段聚合物 

分 类 号：X703[环境科学与工程—环境工程]