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Ismail A, Zahid M, Ali S, Bakhtiar SUH, Ali N, Khan A, Zhu Y. Engineering of oxygen vacancy defect in CeO 2 through Mn doping for toluene catalytic oxidation at low temperature. Environ Res 2023; 226:115680. [PMID: 36925036 DOI: 10.1016/j.envres.2023.115680] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/08/2022] [Accepted: 03/10/2023] [Indexed: 06/18/2023]
Abstract
Catalytic oxidation is considered a highly effective method for the elimination of volatile organic compounds. Oxygen vacancy defect engineering in a catalyst is considered an effective approach for high-performance catalysts. Herein, a series of doped MnxCe1-xO2 catalysts (x = 0.05-0.2) with oxygen vacancy defects were synthesized by doping low-valent Mn in a CeO2 lattice. Different characterization techniques were utilized to inspect the effect of doping on oxygen vacancy defect generation. The characterization results revealed that the Mn0.15Ce0.85O2 catalyst has the maximum oxygen vacancy concentration, leading to increased active oxygen species and enhanced oxygen mobility. Thus, Mn0.15Ce0.85O2 catalyst showed an excellent toluene oxidation activity with 90% toluene conversion temperature (T90) of 197 °C at a weight hourly space velocity of 40,000 mL g-1 h-1 as compared to undoped CeO2 (T90 = 225 °C) and Ce based oxides in previous reports. In addition, the Mn0.15Ce0.85O2 catalyst displayed strong recyclability, water resistant ability and long-time stability. The in situ DRIFT results showed that the Mn0.15Ce0.85O2 catalyst has a robust oxidation capability as toluene is quickly adsorbed and actuated as compared to CeO2. Thus, the present work lays the foundation for designing a highly active catalyst for toluene elimination from the environment.
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Affiliation(s)
- Ahmed Ismail
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin, 150080, China
| | - Muhammad Zahid
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin, 150080, China
| | - Sharafat Ali
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, PR China
| | - Syed Ul Hasnain Bakhtiar
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, PR China
| | - Nauman Ali
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan
| | - Adnan Khan
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
| | - Yujun Zhu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin, 150080, China.
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Wu X, Liu T, Ni W, Yang H, Huang H, He S, Li C, Ning H, Wu W, Zhao Q, Wu M. Engineering controllable oxygen vacancy defects in iron hydroxide oxide immobilized on reduced graphene oxide for boosting visible light-driven photo-Fenton-like oxidation. J Colloid Interface Sci 2022; 623:9-20. [PMID: 35561576 DOI: 10.1016/j.jcis.2022.04.094] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 04/13/2022] [Accepted: 04/17/2022] [Indexed: 10/18/2022]
Abstract
Visible light-driven photo-Fenton-like technology is a promising advanced oxidation process for water remediation, while the construction of effective synergetic system remains a great challenge. Herein, iron hydroxide oxide (α-FeOOH) with controllable oxygen vacancy defects were engineered on reduced graphene oxide (rGO) nanosheets (named as OVs-FeOOH/rGO) through an in-situ redox method for boosting visible light-driven photo-Fenton-like oxidation. By adjusting the pH environment to modulate the redox reaction kinetics between graphene oxide (GO) and ferrous salt precursors, the oxygen vacancy concentration in α-FeOOH could be precisely controlled. With optimized oxygen vacancy defects obtained at pH 5, the OVs-FeOOH/rGO displayed superior photo-Fenton-like performance for Rhodamine B degradation (99% within 40 mins, rate constant of 0.2278 mg-1 L min-1) with low H2O2 dosage (5 mM), standing out among the reported photo-Fenton-like catalysts. The catalyst also showed excellent reusability, general applicability, and tolerance ability of realistic environmental conditions, which demonstrates great potential for practical applications. The results reveal that moderate oxygen vacancy defects can not only strengthen absorption of visible light and organic pollutants, but also promote the charge transfer to simultaneously accelerate the photogenerated electron-hole separation and Fe(III)/Fe(II) Fenton cycle, leading to the remarkable photo-Fenton-like oxidation performance. This work sheds light on the controllable synthesis and mechanism of oxygen vacancy defects to develop efficient photo-Fenton-like catalysts for wastewater treatment.
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Affiliation(s)
- Xiaocui Wu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Tengfei Liu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Wanxin Ni
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Hao Yang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Hao Huang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Shuwei He
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Cuiyu Li
- Advanced Computing East China Sub-Center, Suma Technology Co., Ltd., Kunshan 215330, China
| | - Hui Ning
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Wenting Wu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
| | - Qingshan Zhao
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.
| | - Mingbo Wu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.
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Lin J, Sun S, Luo J, Cui C, Ma R, Fang L, Liu X. Effects of oxygen vacancy defect on microwave pyrolysis of biomass to produce high-quality syngas and bio-oil: Microwave absorption and in-situ catalytic. Waste Manag 2021; 128:200-210. [PMID: 34000690 DOI: 10.1016/j.wasman.2021.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 04/20/2021] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
This paper proposed to use ferric oxide (Fe2O3) and ferroferric oxide (Fe3O4) as catalysts with both microwave absorption and catalytic properties. Carbon dioxide (CO2) was introduced as the reaction atmosphere to further improve the quality of biofuel produced by microwave pyrolysis of food waste (FW). The results showed the bio-gas yield and the syngas concentration (H2 + CO) increased to 70.34 wt% and 61.50 mol%, respectively, using Fe3O4 as the catalyst. The content of aliphatic hydrocarbons in bio-oil produced with the catalyst Fe2O3 increased to 67.48% and the heating value reached 30.45 MJ/kg. Compared with Fe2O3 catalyst, Fe3O4 exhibited better microwave absorption properties and catalytic properties. Transmission electron microscopy (TEM) and Electron paramagnetic resonance (EPR) characterizations confirmed that the crystal surface of Fe3O4 formed more oxygen vacancy defects and unpaired electrons. Additionally, according to the X-ray photoelectron spectroscopy (XPS) analysis, the content of lattice oxygen in Fe3O4 was 14.11%, a value that was much lower than Fe2O3 (38.54%). The oxygen vacancy defects not only improved the efficient utilization of microwave energy but also provided the reactive sites for the reaction between the volatile organic compounds (VOCs) and CO2 to generate CO. This paper provides a new perspective for selecting catalysts that have both microwave absorption and catalytic properties during the microwave pyrolysis of biomass.
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Affiliation(s)
- Junhao Lin
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shichang Sun
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; Research Center for Water Science and Environmental Engineering, Shenzhen University, 518055, China
| | - Juan Luo
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Chongwei Cui
- School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Rui Ma
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Lin Fang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xiangli Liu
- Shenzhen Engineering Laboratory of Aerospace Detection and Imaging, Department of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
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