Magnetic pyrite cinder as an efficient heterogeneous ozonation catalyst and synergetic effect of deposited Ce.
Heterogeneous catalytic ozonation was emerged to be a promising alternative in the mineralization of various persistent organic pollutants in recent decades. Magnetic pyrite cinder (PyC), which was employed as the catalyst in our investigation, was further deposited by Ce (Ce-PyC) to enhance its catalytic activity in the degradation of aqueous reactive black 5 (RB5). The results showed that additional 17.39%, 42.12% mineralization efficiency was obtained by O3/PyC, O3/Ce-PyC, respectively, in the degradation of RB5 compared to that of O3 alone under identical experimental condition. The reaction mechanism involved the enhanced mineralization of aqueous RB5 at the catalyst-solution interface via hydroxyl radicals produced by the reaction between O3 and catalyst surface. Besides surface hydroxyl, surface Ce(Ⅲ) was crucial for Ce-PyC in the enhanced generation of hydroxyl radicals. More surprisingly, it was found that both PyC and Ce-PyC could exert quite stable catalytic activity in a wide pH range from 3 to 10, which was supposed to be combined with inherently comprised various metal oxide, such as Fe2O3, Fe3O4, MnO2 and CuO. Ozone utilization evaluation demonstrated that PyC and Ce-PyC facilitated effective ozone decomposition, as ozone utilization efficiency (mgTOC/mgO3) of O3/PyC and O3/Ce-PyC increased 64.0%, 155.0%, respectively, compared to that of O3 alone. This investigation provided an effective alternative in the resource utilization of PyC, which was traditionally characterized as a waste material.
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: wudeli@tongji.edu.cn.
Deli
D
Wu
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092, PR China.
Ying
Y
Liu
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092, PR China.
Hongping
H
He
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092, PR China.
Yalei
Y
Zhang
D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D005290:Ferric Compounds; D017665:Hydroxyl Radical; D007501:Iron / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry; D010087:Oxides; D010126:Ozone / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods
D004396:Coloring Agents; D004785:Environmental Pollutants; D005290:Ferric Compounds; D009282:Naphthalenesulfonates; D010087:Oxides; D013440:Sulfides; D014874:Water Pollutants, Chemical; C011342:pyrite; D002563:Cerium; D017665:Hydroxyl Radical; D010126:Ozone; D007501:Iron; C063421:Remazol black B
Catalytic ozonation; Ce(Ⅲ); Mineralization; Pyrite cinder; Resources utilization