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研究报告

邹雪刚,吕文英,王雅兰,王枫亮,舒冉君,陆一达,陈玉萍,刘国光.介孔铁锰双金属氧化物对Pb²⁺的吸附及其机理研究[J].环境科学学报,2018,38(3):982-992

Study on adsorption of Pb²⁺ by mesoporous Fe-Mn binary oxide and its mechanisms

基金项目：广东省自然科学基金（No.2015A030313483）；广东省教育厅特色创新类项目（No.2015KTSCX030）；广东省普通高校创新团队建设项目（自然科学）（No.2015KCXTD007）；广东省科技计划项目（No.2017A020216010）

摘要：采用高温热解金属草酸盐的方法制备了介孔铁锰双金属氧化物（MFMBO），通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（HRTEM）和比表面测定仪等表征，证实合成的材料为类蠕虫状的介孔结构，比表面积为218.68 m²·g^-1.MFMBO对Pb²⁺的吸附动力学符合准二级动力学方程，吸附等温曲线符合Langmuir模型，热力学参数表明对Pb²⁺的吸附过程是非自发和吸热的.实验条件下最大吸附量为250 mg·g^-1，吸附性能优于大多无机吸附剂.傅里叶红外光谱（FTIR）和X射线光电子能谱（XPS）等分析结果表明MFMBO对Pb²⁺的吸附机理主要为Pb²⁺对MFMBO表面羟基中H⁺的替换，从而形成内层表面络合物.

Abstract：Mesoporous Fe-Mn binary oxide(MFMBO) were synthesized through the controlled thermal decomposition of oxalate precursor. XRD、SEM、HRTEM and N₂ adsorption analysis indicated that the as-prepared MFMBO possessed homogeneous worm-like mesopores structure with a high surface areas of ca. 218.68 m²·g^-1. The adsorption of Pb²⁺ by MFMBO was well coincide with the pseudo-second-order kinetics model and Langmuir model could better describe the adsorption isotherms.Thermodynamic parameters demonstrated that the Pb²⁺ adsorption process was nonspontaneous and endothermic. In addition,the maximum adsorption capacity of Pb²⁺ onto MFMBO was 250 mg·g^-1,which was superior to most inorganic materials. FTIR and XPS revealed that the adsorption mechanism can mainly ascribed to the replacement of Pb²⁺ for the H⁺ in hydroxyl groups on the surface of MFMBO to form the inner surface complexes.