Adsorption of Pb2+ and Cu2+ on anionic surfactant-templated amino-functionalized mesoporous silicas
Adsorption of Pb2+ and Cu2+ on anionic surfactant-templated amino-functionalized mesoporous silicas
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阴离子表面活性剂模板氨基功能化介孔二氧化硅对 Pb2 和 Cu2 的吸附
DOI：
10.1016/j.cej.2012.02.047
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发表时间：
2012-05-01
影响因子：
15.1
通讯作者：
Zhu, Weidong
中科院分区：
文献类型：
--
作者：
Hao, Shiyou;Zhong, Yijun;Zhu, Weidong
以阴离子表面活性剂N-月桂酰肌氨酸钠（Sar-Na）为模板剂，3-氨丙基三甲氧基硅烷（APTMS）为共结构导向剂（CSDA），合成了氨基功能化介孔氧化硅（AFMS）。采用正交实验优化了高氨基负载量、高比表面积、大孔径AFMS的合成工艺。采用FT-IR、TG-DTA、XRD、N2吸附-脱附和TEM等技术对合成的AFMS进行了表征。研究了AFMS对水溶液中Cu ~（2+）和Pb ~（2+）的去除效果。含Cu ~（2+）、Pb ~（2+）水溶液的pH值、吸附温度、AFMS投加量对Cu ~（2+）、Pb ~（2+）的去除率影响较大。Cu 2+和Pb 2+在AFMS吸附剂上的一元吸附等温线符合Sips等温模型，在优化条件下，吸附容量分别为2.18和4.74 mmol/g，远高于文献数据。此外，AFMS吸附剂显示出良好的稳定性，通过吸附-再生循环证实。基于这些优异的性能，对该材料在废水中Cu 2+和Pb 2+去除方面的应用进行了展望。(C)2012爱思唯尔有限公司版权所有。
Amino-functionalized mesoporous silicas (AFMS) were synthesized using the anionic surfactant N-lauroylsarcosine sodium (Sar-Na) as template and 3-aminopropyltrimethoxysilane (APTMS) as co-structure directing agent (CSDA). Orthogonal experiments were applied to optimize the synthesis of AFMS with high amino loading, high surface area, and large pore size. The synthesized AFMS were characterized by FT-IR, TG-DTA, XRD, N-2 adsorption-desorption, and TEM techniques. The removal of Cu2+ or Pb2+ from aqueous solutions by the synthesized AFMS was investigated in detail. The pH value of an aqueous solution containing Cu2+ or Pb2+, adsorption temperature, and the dosage of the used AFMS affect the removal efficiency of Cu2+ or Pb2+, greatly. The unary adsorption isotherms of Cu2+ and Pb2+ on the optimized AFMS adsorbent are well described by the Sips isotherm model, in which the adsorption capacities are 2.18 and 4.74 mmol/g for Cu2+ and Pb2+, respectively, under the optimized conditions, much higher than the literature data. Furthermore, the AFMS adsorbent shows a good stability, confirmed by adsorption-regeneration cycles. Based on these excellent properties, the application in the removal of Cu2+ and Pb2+ from wastewater is anticipated. (C) 2012 Elsevier B.V. All rights reserved.