摘要
利用一种含氮硅烷偶联剂γ-氨丙基三乙氧基硅烷改性凹凸棒土,对凹凸棒土改性前后的表面性质进行了分析,并通过静态吸附实验研究了材料对水中汞离子的吸附性能。研究结果表明,酸活化增加了凹凸棒土吸附材料的孔道直径,使吸附速度加快,30 min即达到吸附平衡。通过硅烷偶联剂对凹凸棒土的改性,在材料表面引入了大量氨基,提高了材料对汞离子的去除效果,最大吸附量从改性前的3.8 mg/g提高到92.6 mg/g。该吸附过程符合Langmuir单层吸附模型,其动力学行为符合准二级动力学方程。同时离子强度、pH值以及各种共存离子对其吸附效果的影响均较小。
Attapulgite（ATP） was modified with an amino-terminated organosilicon（γ-aminopropyltriethoxysilane,APTES）.Surface properties of the APTES-modified ATP（M-ATP） were characterized,and the adsorption properties of mercury ion onto M-ATP were studied.The results show that the pore diameter of the adsorbent was enlarged by acid treatment,which accelerated the adsorption process,and the adsorption equilibrium of mercury on M-ATP was achieved within 30 minutes.M-ATP has excellent adsorption ability for mercury ion than original attapulgite,the Qmax increases from 3.8 mg/g to 92.6 mg/g.The adsorption process follows Langmuir isotherm,and kinetics follows the mechanism of the pseudo-second-order equation.It also shows less effects of pH,ionic strength and water constituents on Hg（Ⅱ） uptake by chemical modification of attapulgite.
出处
《环境工程学报》
CAS
CSCD
北大核心
2011年第5期1106-1110,共5页
Chinese Journal of Environmental Engineering
基金
南京大学污染控制与资源化研究国家重点实验室基金资助项目(2010CL07)
关键词
凹凸棒土
硅烷偶联剂
氨基化
汞离子
attapulgite
silane coup ling agent
amine-modified
mercury ion
