摘要
以水热合成的铝麦羟硅钠石(简称AlMag)为基体,以氨丙基三乙氧基硅烷为功能化试剂,制备氨基功能化的新型吸附剂材料AlMag-NH2,研究氨基改性过程对材料结构的影响及其对水溶液中Hg2+的吸附效果。表征结果显示,氨基官能团成功嫁接于AlMag基体上,功能化的AlMag-NH2由初始的玫瑰花苞形貌变为片层状形貌,层间距和平均孔径增大,比表面积略微减小,pHPZC升高。优化吸附实验条件,当溶液pH=5.0、吸附时间为360 min、Hg2+初始质量浓度为10 mg/L时,AlMag-NH2的去除率达到88.82%,是相同条件下AlMag去除率的2.4倍。AlMag-NH2的Hg2+饱和吸附量为20.62 mg/g,吸附过程符合准二级动力学和Langmuir模型,该过程主要为化学吸附。
A novel amino-functionalized adsorbent material Al-magadiite(abbreviated as AlMag-NH2)was prepared by hydrothermal synthesis with Al-magadiite(abbreviated as AlMag)as matrix and aminopropyltriethoxysilane as functional reagent.The effect of amino-modification process on the structure of the materials and the adsorption effect of Hg2+in aqueous solution were studied.The characteristic results showed that the amino-functional groups were successfully grafted onto AlMag matrix.The functionalized AlMag-NH2 changed from the initial rosebud morphology to lamellar morphology.The interlayer spacing and average pore diameter increased,the specific surface area decreased slightly and the pHpzcincreased.The experiment conditions were optimized and obtained as follows:the solution pH=5.0,the absorption time was 360 min and the initial mass concentration of Hg2+was 10 mg/L.Under the same optimized conditions,the removal rate of AlMag-NH2 reached88.82%and was 2.4 times than the removal rate of AlMag.The Hg2+saturated adsorption capacity of AlMag-NH2 was20.62 mg/g.The adsorption process was in accordance with the pseudo second order kinetics and Langmuir model,which was mainly chemical adsorption.
作者
汤钦元
安燕
孙琦
郭兴强
黎青青
郭炳琛
Tang Qinyuan;An Yan;Sun Qi;Guo Xingqiang;Li Qingqing;Guo Bingchen(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550003,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Science;School of Resources and Environmental Engineering,Guizhou University)
出处
《无机盐工业》
CAS
CSCD
北大核心
2020年第8期40-45,共6页
Inorganic Chemicals Industry
基金
贵州省科技计划项目(黔科合LH字[2017]7255号,黔科合平台人才[2017]5788)
贵州大学科技合作项目(H160438号)、贵州大学创新基金项目。
