文献类型：期刊文献

英文题名：Fabrication of beta-cyclodextrin conjugated magnetic HNT/iron oxide composite for high-efficient decontamination of U(VI)

作者：Yang, Shitong[1];Zong, Pengfei[2];Hu, Jun[1];Sheng, Guodong[3];Wang, Qi[1];Wang, Xiangke[1]

机构：[1]Chinese Acad Sci, Inst Plasma Phys, Key Lab Novel Thin Film Solar Cells, Hefei 230031, Peoples R China;[2]Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Xian 710049, Peoples R China;[3]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2013

卷号：214

起止页码：376

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000315322700045)、、EI(收录号：20130215899822)、Scopus(收录号：2-s2.0-84870183748)、WOS

基金：Financial supports from National Natural Science Foundation of China (41203086; 21107115; 21077107) and National Basic Research Program of China (2011CB933700) are acknowledged.

语种：英文

外文关键词：CD/HNT/iron oxide composite; U(VI); Sorption reversibility; Magnetic separation; Simulated effluent disposal

外文摘要：In this study, beta-cyclodextrin (beta-CD) was chemically grafted onto halloysite nanotube/iron oxides (HNT/iron oxides) to prepare a novel magnetic CD/HNT/iron oxide composite. The XRD pattern and FT-IR spectra analysis provide evidence for the successful grafting of beta-CD on HNT/iron oxide surfaces. Elemental analysis indicates that the grafted beta-CD amount in CD/HNT/iron oxide composite is 112 mg/g. Batch technique was adopted to investigate the removal efficiency of U(VI) from aqueous solutions by CD/HNT/iron oxide as a function of various environmental factors. The sorption reversibility and performance of CD/HNT/iron oxide in simulated effluent disposal were also tested. The sorption kinetic data can be well fitted by the pseudo-second-order model. The pH-dependent sorption suggests an optimal pH value of 7.0 for using CD/HNT/iron oxide in the decontamination of U(VI) from aqueous solutions. The sorption irreversibility at pH 5.5 was attributed to the inner-sphere binding of U(VI) on CD/HNT/iron oxide surface sites. The maximum sorption capacity of U(VI) on CD/HNT/iron oxide is considerably higher than that of some other reported materials. Related data show that CD/HNT/iron oxide exhibits satisfactory treatment efficiency for the simulated wastewater. It is worth noting that CD/HNT/iron oxide could be easily separated from aqueous solution by using a permanent magnet. By integrating the experimental results presented in this study, it is clear that CD/HNT/iron oxide can be potentially used as a cost-effective material for the purification of actual U(VI)-bearing effluents. (C) 2012 Elsevier B.V. All rights reserved.