Optimal synthesis of amino-functionalized mesoporous silicas for the adsorption of heavy metal ions
Optimal synthesis of amino-functionalized mesoporous silicas for the adsorption of heavy metal ions
复制标题
用于吸附重金属离子的氨基功能化介孔二氧化硅的优化合成
DOI：
10.1016/j.micromeso.2016.09.008
复制
发表时间：
2016-12-01
影响因子：
5.2
通讯作者：
Zhu, Weidong
中科院分区：
文献类型：
--
作者：
Hao, Shiyou;Verlotta, Antonio;Zhu, Weidong
以阴离子表面活性剂十二酸(DAA)为结构导向剂(SDA)、氨基丙基三甲氧基硅烷(APTMS)为共结构导向剂(CSDA)、正硅酸乙酯(TEOS)为硅源，采用中和法制备了氨基功能化介孔二氧化硅(AFMS)。优化了影响AFMS结构性能和氨基负载量的合成参数。采用傅立叶变换红外光谱、X射线衍射仪、氮气吸附-脱附、透射电子显微镜等测试手段对所合成的原子力显微镜进行了表征。研究了合成的AFMS对单一、二元、三元和四元体系水溶液中Cu2+、Pb2+、Cd2+和Zn2+的选择性去除。实验测得的铜、铅、镉、锌的单组分吸附等温线均符合SIPS模型，其吸附容量分别为0.149、0.593、0.192和0.089 g/g，均高于文献报道的吸附容量。多组分吸附实验结果表明，与Cd~(2+)和Zn~(2+)相比，所合成的吸附剂对Pb2+和Cu2+的去除具有更高的选择性。(C)2016 Elsevier Inc.保留所有权利。
Amino-functionalized mesoporous silicas (AFMS) were synthesized by a neutralization route using the anionic surfactant dodecanoic acid (DAA) as structure-directing agent (SDA), aminopropyltrimethoxysilane (APTMS) as co-structure-directing agent (CSDA), and tetraethoxysilane (TEOS) as silicon source. The synthesis parameters, which affect the structural properties and the amino loadings of the resultant AFMS, were optimized. Various techniques, such as FT-IR, XRD, N-2 adsorption-desorption, and TEM, were used to characterize the synthesized AFMS. The selective removal of Cu2+, Pb2+, Cd2+, and Zn2+ from aqueous solutions in single-, binary-, ternary-, and quaternary-component systems by the synthesized AFMS was thoroughly investigated. The measured single-component adsorption isotherms of Cu2+, Pb2+, Cd2+, and Zn2+ on the AFMS optimally synthesized can be well described by the Sips model, in which the extracted adsorption capacities are 2.34, 2.86, 1.71, and 1.36 mmol/g (0.149, 0.593, 0.192, and 0.089 g/g) for Cu2+, Pb2+, Cd2+, and Zn2+, respectively, higher than those on other adsorbents reported in the literature. Furthermore, Pb2+ and Cu2+ can be more selectively removed by the synthesized adsorbent, compared to Cd2+ and Zn2+, confirmed by the results on the multi-component adsorption. (C) 2016 Elsevier Inc. All rights reserved.