Construction of surface oxygen vacancies by bimetallic doping combined with ellagic acid modification to enhance the photocatalytic degradation of ethinyl estradiol by TiO2

被引：27
作者：
Chen, Yunning [1 ]
Guan, Renquan [1 ]
Cheng, Xueying [1 ]
Zhao, Jie [1 ]
Wu, Zhengkai [1 ]
Wang, Yan [3 ]
Shang, Qingkun [1 ]
Sun, Yingnan [2 ]
机构：
[1] Northeast Normal Univ, Sch Chem, Changchun 130024, Peoples R China
[2] Yancheng Teachers Univ, Instrumental Anal Ctr, Yancheng 224007, Peoples R China
[3] Jilin Univ, Electron Microscopy Ctr, Changchun 130012, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2023年 / 455卷
基金：
中国国家自然科学基金;
关键词：
Oxygen vacancies; Bimetallic doping; Ellagic acid surface bonding; Photocatalysis; TITANIUM-DIOXIDE; BISPHENOL-A; OXIDATION; WATER; 17-BETA-ESTRADIOL; REMOVAL;
D O I：
10.1016/j.cej.2022.140929
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this paper, two surface oxygen vacancy-rich TiO2 composite photocatalysts were successfully constructed by solid thermal reduction ((R-Vo)TiO2) and bimetallic doping (Nd-Fe-(D-Vo)TiO2). The oxygen vacancies were characterized in detail using XPS, Raman, EPR and STEM. The results show that the excellent photocatalytic performance of Nd-Fe-(D-Vo)TiO2 deriving from its doping energy and surface oxygen vacancies. Nd-Fe-(D-Vo) TiO2 could degrade 58 % of phenol within 120 min, which was much greater than 15 % of TiO2 and 27 % of (RVo)TiO2. Three composite photocatalysts, TiO2@EA, (R-Vo)TiO2@EA and Nd-Fe-(D-Vo) TiO2@EA, with better visible light absorption and photocatalytic performance were further obtained by bonding ellagic acid (EA) to the surface of TiO2. Nd-Fe-(D-Vo)TiO2@EA could almost completely degrade ethinyl estradiol within 20 min with a high minimization degree of 84 %. The possible sites of ethinyl estradiol attacked by free radicals were predicted by theoretical calculation combining with high-resolution mass spectrometry analysis, and the possible degradation mechanism was proposed.
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页数：15
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