文献类型：期刊文献

英文题名：Decontamination of Sr(II) on Magnetic Polyaniline/Graphene Oxide Composites: Evidence from Experimental, Spectroscopic, and Modeling Investigation

作者：Hu, Baowei[1];Qu, Muqing[1];Hu, Qingyuan[1];Sun, Yubing[2];Sheng, Guodong[1];Hu, Jun[3];Ma, Jingyuan[4]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Key Lab New Thin Film Solar Cells, POB 1126, Hefei 230031, Anhui, Peoples R China;[3]Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Guangdong, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China

年份：2017

卷号：5

期号：8

起止页码：6924

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000407410900062)、、EI(收录号：20173304038326)、Scopus(收录号：2-s2.0-85027017132)、WOS

基金：We want to thank Prof. Yuying Huang from Shanghai Institute of Applied Physics, Chinese Academy of Sciences for the measurement and analysis of EXAFS spectra. Financial support from the Natural Science Foundation of China (21207092, 21577093), the priority Academic program development of Jiangsu Higher Education Institutions, and the Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Key Lab of Novel Thin Film Solar Cells, Chinese Academy of Sciences and Science and Technology Project of Shaoxing (2014B70041) are acknowledged.

语种：英文

外文关键词：Sr(II); Magnetic graphene oxide; Polyaniline; EXAFS; Modeling

外文摘要：The interaction of Sr(II) on magnetic polyaniline/graphene oxide (PANI/GO) composites was elucidated by batch, EXAFS, and surface complexation modeling techniques. The batch experiments showed that decreased uptake of Sr(II) on magnetic PANI/GO composites was observed with increasing ionic strength at pH <5.0, whereas no effect of ionic strength on Sr(II) uptake was shown at pH >5.0. The maximum uptake capacity of magnetic PANI/GO composites derived from the Langmuir model at pH 3.0 and 293 K was 37.17 mg/g. The outer sphere surface complexation controlled the uptake of Sr(II) on magnetic PANI/GO composites at pH 3.0 due to the similarity to the EXAFS spectra of Sr2+ in aqueous solutions, but the Sr(II) uptake at pH 7.0 was inner sphere complexation owing to the occurrence of the Sr-C shell. According to the analysis of surface complexation modeling, uptake of Sr(II) on magnetic PANI/GO composites was well simulated using a diffuse layer model with an outer-sphere complex (SOHSr2+ species) and two inner sphere complexes (i.e., (SO)(2)Sr(OH)(-) and SOSr+ species). These findings are crucial for the potential application of magnetic nanomaterials as a promising candidate for the uptake of radionuclides for environmental remediation.