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	羟基铁锆改性复合膨润土的表征及其对水中硒酸根的吸附性能; Characterization of hydroxyl Fe/Zr bentonite composite and its adsorption performance for selenium in aqueous solution
	黄丽 ; 陈征贤 ; 黄怀国 ; 庄荣传 ; 王鸿辉 ; 董清木 ; 郭祥群
	2015
关键词	膨润土 硒酸根 表征 吸附动力学 可能的吸附机理 bentonite selenium characterization adsorption kinetics possible adsorption mechanism
英文摘要	采用水热合成法制备羟基铁锆改性复合膨润土(fE/zr-bEnT),通过SEM-EdS、TEM、Xrd对样品的形貌、尺寸、晶型分布等进行了表征,并利用加盐法测定了样品的等电点,及其考察了改性前、后膨润土对水中硒酸根的吸附性能,分析吸附动力学和可能的吸附机理。结果表明,改性后fE/zr-bEnT样品中形貌变得粗糙及铁元素和锆元素的存在、存在纳米级针状羟基铁锆晶体及其大部分分布于膨润土的表面。fE/zr-bEnT的等电点由改性前膨润土的10.5降低至5.5,表面带正电荷,易于通过离子交换、络合、静电作用等方式吸附含氧阴离子硒酸根。改性前、后膨润土对水中硒的去除率由11.84%提高至86.66%,显著增强其吸附性能,其吸附过程符合伪二级动力学吸附模型(r2>0.997),平衡吸附量达到46.73Mg/g。; Hydroxyl Fe/Zr modified bentonite(Fe/Zr-Bent)was prepared by the hydrothermal method and the samples before and after modification were characterized by SEM-EDS,TEM and XRD.Isoelectric point(pHzpc)was measured by the adding salt law.Adsorption performance,adsorption kinetics and possible adsorption mechanism were investigated.The characterization data showed that compared with bentonite before modification,morphology of Fe/Zr-Bent became rougher observed from SEM-EDS and confirmed the existence of Fe and Zr elements,TEM and XRD confirmed that nanoscale needle-like crystals of hydroxyl Fe/Zr irregularly distributed on the surface of bentonite after modification.pHzpcof Fe/Zr-Bent decreased from 10.5to 5.5,which carried positive charge beneficial to adsorb oxyanions selenium via ion exchange,complication and electrostatic interaction.The removal efficiency of selenium in aqueous solution was raised from 11.84%to 86.66%,which significantly enhance its adsorption performance.Adsorption process of selenium was fitting pseudo second-order model(R2>0.997)and adsorption capacity was 46.73mg/g.; 国家质检总局科技计划资助项目(2014IK254)
语种	zh_CN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/107210]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	黄丽,陈征贤,黄怀国,等. 羟基铁锆改性复合膨润土的表征及其对水中硒酸根的吸附性能, Characterization of hydroxyl Fe/Zr bentonite composite and its adsorption performance for selenium in aqueous solution[J],2015.
APA	黄丽.,陈征贤.,黄怀国.,庄荣传.,王鸿辉.,...&郭祥群.(2015).羟基铁锆改性复合膨润土的表征及其对水中硒酸根的吸附性能..
MLA	黄丽,et al."羟基铁锆改性复合膨润土的表征及其对水中硒酸根的吸附性能".(2015).

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