Postsynthesis Growth of CoOOH Nanostructure on SrCo0.6Ti0.4O3-δ Perovskite Surface for Enhanced Degradation of Aqueous Organic Contaminants

被引:83
作者
Zhu, Ming [1 ]
Miao, Jie [1 ]
Duan, Xiaoguang [2 ]
Guan, Daqin [1 ]
Zhong, Yijun [3 ]
Wang, Shaobin [2 ,3 ]
Zhou, Wei [1 ]
Shao, Zongping [1 ,3 ]
机构
[1] Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, 30 Puzhu Rd, Nanjing 210009, Jiangsu, Peoples R China
[2] Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia
[3] Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia
来源
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2018年 / 6卷 / 11期
基金
中国国家自然科学基金;
关键词
Peroxymonosulfate; Perovskite nanocomposites; CoOOH nanosheet; Cobalt leaching; Surface oxygen defects; Singlet oxygen; ADVANCED OXIDATION PROCESSES; CATALYTIC-OXIDATION; PEROXYMONOSULFATE ACTIVATION; EFFICIENT DEGRADATION; PHENOLIC-COMPOUNDS; BISPHENOL-A; WATER; EVOLUTION; POLLUTANTS; PERSULFATE;
D O I
10.1021/acssuschemeng.8b04289
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The deployment of an efficient catalyst is critical for successful application of peroxymonosulfate-based advanced oxidation processes to the rapid degradation of retardant organics in wastewater. Considering the rich properties of perovskite oxides and their drawbacks of low specific area and easy cation leaching, we reported a facile postsynthesis hydrothermal treatment method for preparing SrCo0.6Ti0.4O3-delta@CoOOH (SCT@CoOOH) nanocomposite as an efficient catalyst for PMS activation here. Surprisingly, CoOOH nanosheets were grown in situ over the surface of SCT substrate, resulting in a significantly increased surface area (22.1 m(2) g(-1)), enhanced charge transfer capability, more generated surface oxygen defects and a strongly synergistic effect created between the bulk SCT and CoOOH surface layer. Remarkably, SCT@CoOOH exhibited higher (1.7 times) catalytic activity (0.84 mg L-1 min(-1)) for phenol degradation than SCT. Additionally, suppressed cobalt leaching was demonstrated in the SCT@CoOOH/PMS system. Notably, singlet oxygen as additional oxidative species were formed to accelerate phenol degradation in the radical-based SCT@CoOOH/PMS system due to the surface oxygen defects. The beneficial effect of higher pH value and different influence of foreign anions on the reation rate were also investigated. As a universal method, it may be also useful for the development of innovative functional materials for other various applications.
引用
收藏
页码:15737 / 15748
页数:23
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