金属有机骨架MIL-101(Fe)吸附As(Ⅲ)的性能研究
Adsorption of As(III) by metal-organic frameworks materials of MIL-101 (Fe)
投稿时间:2018-01-26  修订日期:2018-04-26
DOI:
中文关键词: 金属有机骨架  吸附  As(Ⅲ)  MIL-101(Fe)
英文关键词: MOFs  adsorption  As(Ⅲ)  MIL-101(Fe)
基金项目:湖北省自然科学基金资助项目(2015CFB550)
作者单位E-mail
吴桂萍 中南民族大学资源与环境学院 497930560@qq.com 
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中文摘要:
      以对苯二甲酸为有机配体、Fe(III)为中心金属,采用水热法合成金属有机骨架材料MIL-101(Fe),用XRD、SEM对其结构进行了表征。用MIL-101(Fe)吸附溶液中的As(III),考察了溶液pH值、反应时间、溶液浓度以及温度对吸附的影响。结果表明:溶液pH对吸附影响明显,pH=9时,吸附效果最佳;MIL-101(Fe)对As(Ⅲ) 的吸附速率较快,吸附过程符合拟二级动力学;等温吸附实验数据与Langmuir和TemKin模型拟合良好,303K条件下,MIL-101(Fe)对As(Ⅲ)的最大吸附量为211.42 mg?g-1;热力学参数ΔG、ΔH均小于0,吸附过程为自发放热反应; MIL-101(Fe)的中心金属Fe与As(III)的配位作用(Fe←O-As)在吸附过程中起主要作用。
英文摘要:
      In this study, Fe-based metal-organic frameworks, MIL-101 was prepared by hydrothermal method using terephthalic acid as the organic ligand and Fe (III) as the central metal ion. The obtained MIL-101(Fe) was characterized by XRD, SEM and employed for effective adsorption of As(III). Then the effects of pH value, contact time, initial concentration and temperature on the adsorption of As (III) by MIL-101 (Fe) were investigated. The experiment result showed that the effect of solution pH on adsorption was obvious and the best adsorptive effect was achieved at pH=9.The adsorption of As (III) by MIL-101 (Fe) was rapid and the process followed Pseudo-second order kinetics. Langmuir and TemKin isotherm models were found to be more fit through isothermal adsorption experiment and the maximum adsorption capacity was 211.42 mg?g-1 at 303K. According to its ΔG and ΔH were both less than zero, the adsorption process was a spontaneous exothermic reaction. The adsorption mainly achieved by the coordination interaction between arsenous anion and the central metal ion of MIL-101(Fe).
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