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Yang L, Xue T. Kinetics and H 2O Influence on NO x Trapping and Selective Catalytic Reduction over Ce/Pd Doping Catalyst. Molecules 2024; 29:3457. [PMID: 39124862 PMCID: PMC11313542 DOI: 10.3390/molecules29153457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 07/11/2024] [Accepted: 07/16/2024] [Indexed: 08/12/2024] Open
Abstract
In this paper, the removal effects and activation energy of Ce and Pd doping on pollutants (CO, C3H6, and NO) were comparatively analyzed by using characterization methods and constructed kinetic equations. Furthermore, the problems of the water influence mechanism on the NSR process were also discussed. The results show the following: (1) Pd doping effectively improves the removal of CO (80%) and C3H6 (71%) in the low-temperature section of the catalyst (150-250 °C) compared to Ce doping, while Ce doping exhibits excellent low-temperature conversion of NO. (2) The reaction activation energy of the LaKMnPdO3 catalyst was 9784 kJ/mol, which was significantly lower than that of the LaKMnCeO3 catalyst. (3) The presence of H2O has an important enhancement effect in the storage performance of the LaKMnPdO3 catalyst for NOx but decreases the catalytic reduction of NO. It provides a solution for the effective treatment of the increasing problems of particulate matter and ozone pollution.
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Affiliation(s)
- Li Yang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China;
- Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Tianshan Xue
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China;
- Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Zhai X, Chen M. Accelerated Design for Perovskite-Oxide-Based Photocatalysts Using Machine Learning Techniques. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3026. [PMID: 38930399 PMCID: PMC11206125 DOI: 10.3390/ma17123026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 06/05/2024] [Accepted: 06/08/2024] [Indexed: 06/28/2024]
Abstract
The rapid discovery of photocatalysts with desired performance among tens of thousands of potential perovskites represents a significant advancement. To expedite the design of perovskite-oxide-based photocatalysts, we developed a model of ABO3-type perovskites using machine learning methods based on atomic and experimental parameters. This model can be used to predict specific surface area (SSA), a key parameter closely associated with photocatalytic activity. The model construction involved several steps, including data collection, feature selection, model construction, web-service development, virtual screening and mechanism elucidation. Statistical analysis revealed that the support vector regression model achieved a correlation coefficient of 0.9462 for the training set and 0.8786 for the leave-one-out cross-validation. The potential perovskites with higher SSA than the highest SSA observed in the existing dataset were identified using the model and our computation platform. We also developed a webserver of the model, freely accessible to users. The methodologies outlined in this study not only facilitate the discovery of new perovskites but also enable exploration of the correlations between the perovskite properties and the physicochemical features. These findings provide valuable insights for further research and applications of perovskites using machine learning techniques.
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Affiliation(s)
- Xiuyun Zhai
- College of Intelligent Manufacturing, Hunan University of Science and Engineering, Yongzhou 425199, China
| | - Mingtong Chen
- Public Experimental Teaching Center, Panzhihua University, Panzhihua 617000, China
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Wang K, Li H, Qin X, Ma T, Zhu L, Zhang C, Yu W, Zhou X. Theory-guided unraveling of the mechanism underlying Cu 1.0/Mn 1.0-ZnO with dual reaction centers for enhanced peroxymonosulfate activation. ENVIRONMENTAL RESEARCH 2024; 247:118258. [PMID: 38262512 DOI: 10.1016/j.envres.2024.118258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/08/2024] [Accepted: 01/13/2024] [Indexed: 01/25/2024]
Abstract
Developing efficient catalytic systems for water contamination removal is a topic of great interest. However, the use of heterogeneous catalysts faces challenges due to insufficient active sites and electron cycling. In this study, results from first-principles calculations demonstrate that dual reaction centers (DRCs) are produced around the Cu and Mn sites in Cu1.0/Mn1.0-ZnO due to the electronegativity difference. Experimental results reveal the material with DRCs greatly enhances electron transfer efficiency and significantly impacts the oxidation and reduction of peroxymonosulfate (PMS). In addition, the self-consistent potential correction (SCPC) method was introduced to correct the energy and charge of charged periodic systems simulating a catalytic process, resulting in more precise catalytic results. Specifically, the material exhibits a preference for adsorbing negatively charged PMS anions at electron-deficient Mn sites, facilitating PMS oxidation for the generation of 1O2, and PMS reduction around the electron-rich Cu for the formation of •OH and SO4•-. The major reactive oxygen species is 1O2, showcasing effective performance in various degradation systems. Overall, our work provides novel insights into the persulfate-based heterogeneous catalytic oxidation process, paving the way for the development of high-performance catalytic systems for water purification.
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Affiliation(s)
- Kaixuan Wang
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
| | - Haibo Li
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
| | - Xiaofei Qin
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
| | - Ting Ma
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
| | - Lin Zhu
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Chenxi Zhang
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
| | - Wei Yu
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
| | - Xulun Zhou
- School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
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Dung NT, Ha DTH, Thao VD, Thao NP, Lam TD, Lan PT, Trang TT, Ngan LV, Nhi BD, Thuy NT, Lin KYA, Huy NN. Effective activation of peroxymonosulfate by CoCr-LDH for removing organic contaminants in water: from lab-scale to practical applications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:26773-26789. [PMID: 38456975 DOI: 10.1007/s11356-024-32776-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 03/01/2024] [Indexed: 03/09/2024]
Abstract
In this study, CoCr layered double hydroxide material (CoCr-LDH) was prepared and used as an effective catalyst for peroxymonosulfate (PMS) activation to degrade organics in water. The prepared CoCr-LDH material had a crystalline structure and relatively porous structure, as determined by various surface analyses. In Rhodamine B (RhB) removal, the most outstanding PMS activation ability belongs to the material with a Co:Cr molar ratio of 2:1. The removal of RhB follows pseudo-first-order kinetics (R2 > 0.99) with an activation energy of 38.23 kJ/mol and efficiency of 98% after 7 min of treatment, and the total organic carbon of the solution reduced 47.2% after 10 min. The activation and oxidation mechanisms were proposed and the RhB degradation pathways were suggested with the key contribution of O2•- and 1O2. Notably, CoCr-LDH can activate PMS over a wide pH range of 4 - 9, and apply to a wide range of organic pollutants and aqueous environments. The material has high stability and good recovery, which can be reused for 5 cycles with a stable efficiency of above 88%, suggesting a high potential for practical recalcitrant water treatment via PMS activation by heterogeneous catalysts.
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Affiliation(s)
- Nguyen Trung Dung
- Faculty of Physics and Chemical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet St., Bac Tu Liem District, Hanoi, Vietnam
| | - Do Thi Hong Ha
- Faculty of Physics and Chemical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet St., Bac Tu Liem District, Hanoi, Vietnam
| | - Vu Dinh Thao
- Faculty of Physics and Chemical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet St., Bac Tu Liem District, Hanoi, Vietnam
| | - Nguyen Phuong Thao
- Faculty of Physics and Chemical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet St., Bac Tu Liem District, Hanoi, Vietnam
| | - Tran Dai Lam
- Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Pham Thi Lan
- Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Tran Thi Trang
- Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, Viet Nam
| | - Le Viet Ngan
- National Institute for Food Control, 65 Pham Than Duat Street, Mai Dich Ward, Cau Giay District, Hanoi, Vietnam
| | - Bui Dinh Nhi
- Faculty of Environmental Technology, Viet Tri University of Industry, 9 Tien Sơn Street, Tien Cat District, Phu Tho, Viet Nam
| | - Nguyen Thi Thuy
- School of Environmental Engineering, International University, Quarter 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam
- Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam
| | - Kun-Yi Andrew Lin
- Innovation and Development Center of Sustainable Agriculture and Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan
| | - Nguyen Nhat Huy
- Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam.
- Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam.
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Qadir I, Singh S, Sharma S, Manhas U, Atri AK, Singh D. New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr 2La 0.5R 0.5FeMnO 7 (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties. ACS OMEGA 2023; 8:2010-2026. [PMID: 36687044 PMCID: PMC9850717 DOI: 10.1021/acsomega.2c05221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
This paper presents the rare earth doping effect on the structural, optical, and magnetic properties of bilayered Ruddlesden-Popper oxides Sr2La0.5R0.5FeMnO7 (R = La, Nd, Sm, Gd, Dy). Moreover, we are reporting for the first time a new rare earth-doped bilayered perovskite oxide series for the highly toxic methylene blue dye degradation in wastewater under visible light. Structural analysis of the PXRD data using the Rietveld refinements confirms the formation of the phases in tetragonal symmetry with the I4/mmm space group. The unit cell lattice parameters (a & c) and the cell volume (V) decrease monotonically from La- to Dy-doped samples owing to the decrease in the lanthanide ionic radii. The X-ray photoelectron spectroscopy analysis indicates the existence of the Mn ions in the mixed valence state. The DRS study shows that the energy band gap value decreases on moving from La to Gd substitution; however, it further increases for the Dy-doped sample. The magnetic measurements reveal that all the phases exhibit dominant anti-ferromagnetic interactions with Neel temperature (T N) observed at 150, 147, 138, 113, and 117 K for La-, Nd-, Sm-, Gd-, and Dy-substituted phases, respectively. However, the presence of an unsaturated hysteresis loop observed in the isothermal magnetic field (H) vs magnetization (M) plot also indicates the existence of weak ferromagnetic interactions. The investigation of the photocatalytic activity of the synthesized samples was done by carrying out photo-oxidative degradation of methylene blue (MB) dye pollutants. The results show that the photodegradation enhances by doping with heavier rare earth ions with the exception of the Dy-doped sample. The Gd-doped catalyst shows the maximum degradation efficiency of 99.03% in 50 min under visible light irradiation. The scavenging experiments confirmed that the·OH was the main/dominant oxidizing agent involved in the degradation of the MB dye.
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Singh B, Singh P, Siddiqui S, Singh D, Gupta M. Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange, crystal violet and indigo carmine dyes in tungsten bulb/sunlight. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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