Performance and mechanism of U(Ⅵ) removal in binary system by magnetic titanium dioxide/graphene oxide composites

doi:10.11894/iwt.2020-0118

Abstract

Abstract:

Magnetic titanium dioxide/graphite oxide(magnetic TiO₂/GO) composites were synthesized and used to treat U(Ⅵ)-Cd(Ⅱ) coexisting binary system wastewater. The effects of initial pH, the dosage of magnetic TiO₂/GO, and the reaction time on the removal of U(Ⅵ) were investigated. The removal mechanism of U(Ⅵ) was explored using FTIR and X-ray photoelectron spectroscopy. The result showed that the synthesized magnetic TiO₂/GO was a kind of layered aggregate with mesoporous structure which had perfect photocatalytic ability in visible light range. With the pH of 6, the magnetic TiO₂/GO dosage of 15 mg and reaction time of 120 min, the maximum removal efficiency of U(Ⅵ) by magnetic TiO₂/GO was up to 93.72%. The complexation of amino functional groups and photocatalytic reduction of magnetic TiO₂/GO are probably the key points for selectivity of U(Ⅵ) removal.

Key words: magnetic titanium dioxide, graphene oxide, uranium wastewater, heavy metal, selectivity

摘要：

合成了磁性二氧化钛/氧化石墨烯（磁性TiO₂/GO）复合材料，用其处理U（Ⅵ）-Cd（Ⅱ）共存二元体系废水。考察了初始pH、磁性TiO₂/GO投加量和反应时间对U（Ⅵ）去除效果的影响，并用红外光谱仪和X射线光电子能谱仪探究去除机理。结果表明，磁性TiO₂/GO为介孔层状聚集物，在可见光范围内光催化能力较好。在pH为6、投加量为15 mg、反应时间为120 min条件下对U（Ⅵ）的去除效果最佳（去除率为93.72%）。磁性TiO₂/GO选择性去除U（Ⅵ）的主要机制为氨基官能团络合作用和光催化还原作用。

关键词: 磁性二氧化钛, 氧化石墨烯, 含铀废水, 重金属, 选择性

CLC Number:

X703

Zhenping Tang,Shasha Xiao,Yanxing Xie,Yuxi Bi,Yingjiu Liu,Shuai Zhou. Performance and mechanism of U(Ⅵ) removal in binary system by magnetic titanium dioxide/graphene oxide composites[J]. Industrial Water Treatment, 2020, 40(12): 54-59.

唐振平,肖莎莎,谢严兴,毕玉玺,刘迎九,周帅. 磁性TiO₂/GO对二元体系中U（Ⅵ）的去除效能及机理[J]. 工业水处理, 2020, 40(12): 54-59.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2020-0118

https://www.iwt.cn/EN/Y2020/V40/I12/54

Figures/Tables 6

References 25

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离子种类	q_{e, exp}/(mg·g^-1)	准一级动力学			准二级动力学			颗粒内扩散
离子种类	q_{e, exp}/(mg·g^-1)	k₁	q_{e, cal}	R²	k₂	q_{e, cal}	R²	c	k_dif	R²
U(Ⅵ)(二元)	31.33	0.003	25.482	0.477	0.032	31.656	0.999	34.105	0.939	0.711
Cd(Ⅱ)(二元)	26.200	0.025	11.677	0.907	0.007	26.738	0.999	67.148	0.546	0.650
U(Ⅵ)(单组分)	49.825	0.034	12.452	0.929	0.015	50.000	0.999	41.833	0.585	0.700
Cd(Ⅱ)(单组分)	47.622	0.030	6.138	0.798	0.018	47.847	0.999	37.044	0.800	0.391

离子种类	q_{e, exp}/(mg·g^-1)	准一级动力学			准二级动力学			颗粒内扩散
离子种类	q_{e, exp}/(mg·g^-1)	k₁	q_{e, cal}	R²	k₂	q_{e, cal}	R²	c	k_dif	R²
U(Ⅵ)(二元)	31.33	0.003	25.482	0.477	0.032	31.656	0.999	34.105	0.939	0.711
Cd(Ⅱ)(二元)	26.200	0.025	11.677	0.907	0.007	26.738	0.999	67.148	0.546	0.650
U(Ⅵ)(单组分)	49.825	0.034	12.452	0.929	0.015	50.000	0.999	41.833	0.585	0.700
Cd(Ⅱ)(单组分)	47.622	0.030	6.138	0.798	0.018	47.847	0.999	37.044	0.800	0.391

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