Direct synthesis of ordered N-methylimidazolium functionalized mesoporous silica as highly efficient anion exchanger of Cr(VI)
Direct synthesis of ordered N-methylimidazolium functionalized mesoporous silica as highly efficient anion exchanger of Cr(VI)
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DOI：
10.1039/b912345h
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发表时间：
2010-02
影响因子：
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通讯作者：
Lili Zhu;Chaofu Zhang;Yinghui Liu;Dongyang Wang;Ji Chen
中科院分区：
文献类型：
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作者：
Lili Zhu;Chaofu Zhang;Yinghui Liu;Dongyang Wang;Ji Chen
以正硅酸乙酯和1-甲基-3-（三乙氧基硅丙基）咪唑鎓氯化物为原料，直接合成了N-甲基咪唑鎓功能化的有序介孔氧化硅（SBA-15）阴离子交换剂。所制备的棒状样品具有高表面积（>400 m2 g−1）、有序的孔（>58 A）以及高达387 °C的优异热稳定性。采用间歇法研究了该阴离子交换剂对水中Cr（VI）的吸附行为。阴离子交换剂具有50.8至90.5 mg g-1的高吸附容量，在比氨基官能化介孔二氧化硅更宽的pH范围（1-8）内。吸附速率较快，在pH 4.6时吸附量最大。阴离子交换剂的吸附数据符合Langmuir等温方程。阴离子交换剂的大部分活性位点都很容易接近。0.1 mol L-1 NH3·H2O和0.5 mol L-1 NH 4Cl的混合溶液是有效的解吸液，Cr（VI）的解吸率可达95%。
Ordered N-methylimidazolium functionalized mesoporous silica (SBA-15) anion exchangers were directly synthesized by co-condensation of tetraethoxysilane with 1-methyl-3-(triethoxysilylpropyl)imidazolium chloride. The prepared samples with rod-like morphology showed high surface areas (>400 m2 g−1), well-ordered pores (>58 A), and excellent thermal stability up to 387 °C. The adsorption behaviors of Cr(VI) from aqueous solution on the anion exchangers were studied using the batch method. The anion exchangers had high adsorption capacity ranging from 50.8 to 90.5 mg g−1, over a wider pH range (1–8) than amino functionalized mesoporous silica. The adsorption rate was fast, and the maximum adsorption was obtained at pH 4.6. The adsorption data for the anion exchangers were consistent with the Langmuir isotherm equation. Most active sites of the anion exchangers were easily accessible. The mixed solution of 0.1 mol L−1 NH3·H2O and 0.5 mol L−1 NH4Cl was effective desorption solution, and 95% of Cr(VI) could be desorbed.