Fabricating a graphene oxide-bayberry tannin sponge for effective radionuclide removal

被引:10
作者
Deng, Xiaodong [1 ]
Liu, Xiaonan [1 ]
Duan, Tao [1 ]
Zhu, Wenkun [1 ]
Yi, Zao [1 ]
Yao, Weitang [1 ]
机构
[1] Southwest Univ Sci & Technol, Key Subject Lab Natl Def Radioact Waste & Environ, Mianyang 621010, Peoples R China
关键词
graphene oxide; bayberry tannin; radionuclide; strontium; AQUEOUS-SOLUTION; CARBON NANOTUBES; STRONTIUM IONS; METAL-IONS; ADSORPTION; HYDROXYAPATITE; AEROGELS; WATER; CESIUM; TETRACYCLINE;
D O I
10.1088/2053-1591/3/5/055002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Bayberry tannin (BT)-reduced graphene oxide (rGO) sponges have been prepared by self-assembly, with bayberry tannin serving as both reductant and surface functionalization agent. The synthetic method is based on the self-assembly of graphene oxide (GO) sheets into porous hydrogel structures. By varying the weight ratio of GO to BT, a series of sorbents with different densities of organic molecules have been obtained and applied to remove Sr2+ from aqueous solutions. Adsorption isotherms (Langmuir and Freundlich) and kinetics (pseudo-first order and pseudo-second order) have been investigated to discuss the sorption performance of rGO/BT sponges. The rGO/BT (w/w 1: 1) sponge shows excellent adsorption properties for Sr2+, with maximum capacities of 67.98 mg g(-1). The adsorption capacity is much higher than those in classic Sr2+ adsorbents, such as hydrous manganese dioxide, Egyptian soils, Hydroxyapatite nanoparticles, sodium hexa-titanate nanofibers, Graphene oxide, artificially altered phlogopite(Ca-Phl), and PB/Fe3O4/GO. Adsorption mechanisms have been examined using the x-ray photoelectron spectra of sorbents before and after Sr2+ adsorption, and the results indicate that the sorption of Sr2+ on GO and GO/BT 1.0 is largely depended on oxygen functional groups. The results show that the GO/BT sponge is a promising candidate for adsorbing Sr2+ ion.
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页数:12
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