气候变化领域集成服务门户(CCPortal): Carboxyl groups on g-C3N4 for boosting the photocatalytic U(VI) reduction in the presence of carbonates

CCPortal

DOI	10.1016/j.cej.2021.128810
	Carboxyl groups on g-C3N4 for boosting the photocatalytic U(VI) reduction in the presence of carbonates
	Li, Ping; Wang, Yun; Wang, Jingjing; Dong, Liang; Zhang, Wentao; Lu, Zhuanhong; Liang, Jianjun; Pan, Duoqiang; Fan, Qiaohui
通讯作者	Fan, QH (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	1385-8947
EISSN	1873-3212
卷号	414
英文摘要	The photocatalytic U(VI) reduction provides a promising strategy for extracting uranium from seawater. How-ever, seawater contains similar to 2.75 mM carbonates, which would seriously inhibit the photocatalytic reduction of U (VI), restricting the practical application of this method. This study is devoted to realizing the photo-reduction of U(VI) in carbonates-containing system by developing a highly efficient photocatalyst. Carboxylated carbon nitride (CCN) catalysts with different amounts of carboxyl groups were prepared (CCN-5 and CCN-24) by oxi-dating bulk carbon nitride (BCN). Compared to BCN, the adsorption ability of CCN-24 for U(VI) increased by 30% and 9% in the presence of 2.0 mM and 10.0 mM NaHCO3, respectively. Moreover, the modification of electron-withdrawing carboxyl groups reduced the conduction band position and promoted the separation efficiency of electrons and holes, facilitating the photocatalytic performance for the reduction of U(VI). Under the illumi-nation of visible-light, CCN exhibited high reactivity for the photocatalytic U(VI) reduction in carbonates-containing system. In the presence of 10.0 mM HCO3-, CCN-24 showed a U(VI) reduction rate of 0.0867 min(-1), being-33 times of that for BCN (0.0026 min(-1)). Electron spin resonance (ESR) and radical trapping investigation proved that center dot O-2(-) was the main active reduction species for U(VI), and more center dot O-2(-) and fewer oxidizing center dot OH radicals were generated on CCN than BCN. It was also verified that CCN could remain stable and keep high photocatalytic reactivity after at least 5 recycles. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) confirmed that U(VI) was finally reduced to U(IV) and UO2+x was finally formed on the photocatalyst surface. This work opens up the possibility of extracting uranium from carbonates-containing solutions via photocatalysis method, expending the application of this method in natural systems.
关键词	URANIUM EXTRACTION AQUEOUS-SOLUTION VISIBLE-LIGHT NITRIDE NANOSHEETS GRAPHENE WATER TIO2 ELIMINATION REMOVAL PHOTOCONVERSION
英文关键词	g-C3N4; Carboxyl groups; Uranium; Photocatalysis; Reduction
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Environmental ; Engineering, Chemical
WOS记录号	WOS:000641316500005
来源期刊	CHEMICAL ENGINEERING JOURNAL
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254004
作者单位	[Li, Ping; Wang, Yun; Wang, Jingjing; Zhang, Wentao; Lu, Zhuanhong; Liang, Jianjun; Fan, Qiaohui] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Li, Ping; Wang, Yun; Zhang, Wentao; Lu, Zhuanhong; Liang, Jianjun; Fan, Qiaohui] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Wang, Jingjing; Pan, Duoqiang] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China; [Dong, Liang] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621000, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Li, Ping,Wang, Yun,Wang, Jingjing,et al. Carboxyl groups on g-C3N4 for boosting the photocatalytic U(VI) reduction in the presence of carbonates[J]. 中国科学院西北生态环境资源研究院,2021,414.
APA	Li, Ping.,Wang, Yun.,Wang, Jingjing.,Dong, Liang.,Zhang, Wentao.,...&Fan, Qiaohui.(2021).Carboxyl groups on g-C3N4 for boosting the photocatalytic U(VI) reduction in the presence of carbonates.CHEMICAL ENGINEERING JOURNAL,414.
MLA	Li, Ping,et al."Carboxyl groups on g-C3N4 for boosting the photocatalytic U(VI) reduction in the presence of carbonates".CHEMICAL ENGINEERING JOURNAL 414(2021).