氨基功能化铝麦羟硅钠石吸附Hg2+性能研究

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。

Amino-functionalized Al-magadiite for Hg2+ adsorption

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.