氨基功能化铝麦羟硅钠石吸附Hg2+性能研究

doi:10.11962/1006-4990.2020-0105

摘要/Abstract

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,pH_PZC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。

关键词: 铝麦羟硅钠石, 氨基功能化, Hg²⁺, 吸附

Abstract:

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 pH_pzc increased.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 reached 88.82% and was 2.4 times than the removal rate of AlMag.The Hg²⁺ saturated adsorption capacity of AlMag-NH₂was 20.62 mg/g.The adsorption process was in accordance with the pseudo second order kinetics and Langmuir model,which was mainly chemical adsorption.

Key words: Al-magadiite, amino-functionalization, Hg²⁺, adsorption

中图分类号:

TQ131.1

汤钦元,安燕,孙琦,郭兴强,黎青青,郭炳琛. 氨基功能化铝麦羟硅钠石吸附Hg²⁺性能研究[J]. 无机盐工业, 2020, 52(8): 40-45.

Tang Qinyuan,An Yan,Sun Qi,Guo Xingqiang,Li Qingqing,Guo Bingchen. Amino-functionalized Al-magadiite for Hg²⁺ adsorption[J]. Inorganic Chemicals Industry, 2020, 52(8): 40-45.

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参考文献 20

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样品	层间距/ nm	比表面积/ （m²·g^-1）	孔体积/ （cm³·g^-1）	孔径/ nm
AlMag	0.44	19.37	0.08	17.04
AlMag-NH₂	2.07	13.25	0.07	25.47

样品	q_e,exp/ （mg·g^-1）	准一级动力学模型			准二级动力学模型
样品	q_e,exp/ （mg·g^-1）	q_e,cal/ （mg·g^-1）	k₁/ min^-1	R²	q_e,cal/ （mg· g^-1）	k₂/ （g·mg^-1·min^-1）	R²
AlMag	3.11	3.21	0.012 1	0.922 0	4.59	0.005 5	0.994 9
AlMag-NH₂	9.36	0.63	0.454 1	0.721 5	9.50	0.109 9	0.999 9

样品	q_e,exp/ （mg·g^-1）	Langmuir方程			Freundlich方程
样品	q_e,exp/ （mg·g^-1）	q_m,cal/ （mg·g^-1）	K_L/ （L·mg^-1）	R²	K_F/ （mg·g^-1）	n_F	R²
AlMag	13.74	28.45	0.03	0.951 4	1.18	1.42	0.970 5
AlMag-NH₂	20.62	23.14	0.29	0.990 5	1.23	3.73	0.955 8

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氨基功能化铝麦羟硅钠石吸附Hg²⁺性能研究

Amino-functionalized Al-magadiite for Hg²⁺ adsorption

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