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Zhang C, Zheng J, Su S, Jin Y, Chen Z, Wang Y, Xu J. Continuous and controllable synthesis of MnO 2 adsorbents for H 2S removal at low temperature. J Hazard Mater 2024; 471:134402. [PMID: 38688216 DOI: 10.1016/j.jhazmat.2024.134402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/15/2024] [Accepted: 04/23/2024] [Indexed: 05/02/2024]
Abstract
H2S is an extremely noxious impurity generated from nature and chemical industrial processes. High performing H2S adsorbents are required for chemical industry and environmental engineering. Herein, α-, γ-, and δ-MnO2 adsorbents with high sulfur capacity were synthesized through a continuous-flow approach with a microreactor system, achieving much higher efficiency than hydrothermal methods. The relationship between crystal structure and synthesis conditions such as residence time, reaction temperature, concentration of K+ in solution and reactant ratio is discussed. According to the H2S breakthrough tests at 150 °C, continuously prepared α-, γ-, and δ-MnO2 exhibited sulfur capacities of 669.5, 193.8 and 607.6 mg S/g sorbent, respectively, which was at a high level among the reported adsorbents. Such enhanced performance is related to the large surface area and mesopore volume, high reducibility, and a large number of oxygen species with high reactivity and mobility. Manganese sulfide and elemental sulfur were formed after desulfurization, which indicated the reaction consisted of two steps: redox and sulfidation of the sorbents. This study provides an innovative design strategy for the construction of nanomaterials with high H2S adsorption performances.
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Affiliation(s)
- Chenxiao Zhang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jinyu Zheng
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Shikun Su
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Ye Jin
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Zhuo Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
| | - Yundong Wang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jianhong Xu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
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Ye Z, Wang G, Giraudon JM, Nikiforov A, Chen J, Zhao L, Zhang X, Wang J. Investigation of Cu-Mn catalytic ozonation of toluene: Crystal phase, intermediates and mechanism. J Hazard Mater 2022; 424:127321. [PMID: 34741940 DOI: 10.1016/j.jhazmat.2021.127321] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [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: 06/01/2021] [Revised: 09/15/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
The effect of different crystal phases, i.e. spinel phase (CuMn2O4) and amorphous phase (Cu0.2MnOx), was explored in Cu-Mn catalytic ozonation of toluene. The toluene removal efficiency followed the order of Cu0.2MnOx (91.2%) ˃ CuMn2O4 (74.5%) ˃ commercial catalyst Cu0.3MnOx (70.3%) in 130 min, and the higher CO2 yield (67.6%) could be also observed using Cu0.2MnOx. In order to investigate the effect of phases on the toluene degradation pathway, the intermediates and byproducts were identified by DRIFTS, GC-MS, and TOF-SIMS. No obvious difference was observed in the distribution of byproducts, except for the quantities, suggesting the discrepancy of oxidation rate. On the other hand, the catalysts were characterized before and after the ozonation process by TEM, BET, XPS, XRD, EPR, TGA, and TPR. It was proposed that for amorphous catalysts, the oxygen vacancy (Vo) helped the chemisorption of toluene, and adjacent Mn reacted as the main active site for the ozonation process. While, the redox pair of Cu+/Mn4+ and Cu2+/(Mn3+, Mn2+) in the spinel phase plays an important role in the generation of oxygen vacancies for O3 decomposition.
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Affiliation(s)
- Zhiping Ye
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou 310014, PR China
| | - Guanjie Wang
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou 310014, PR China
| | - Jean-Marc Giraudon
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCSS-Unite de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Anton Nikiforov
- Ghent University, Faculty of Engineering, Department of Applied Physics, Research Unit Plasma Technology, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium
| | - Jun Chen
- Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310021, China
| | - Liang Zhao
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou 310014, PR China
| | - Xiuwen Zhang
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou 310014, PR China
| | - Jiade Wang
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou 310014, PR China.
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Cao S, Sui N, Zhang P, Zhou T, Tu J, Zhang T. TiO 2 nanostructures with different crystal phases for sensitive acetone gas sensors. J Colloid Interface Sci 2021; 607:357-366. [PMID: 34509110 DOI: 10.1016/j.jcis.2021.08.215] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 01/05/2023]
Abstract
Gas sensors have become increasingly significant because of the rapid development in electronic devices that are applied in detecting noxious gases. Adjusting the crystal phase structure of sensing materials can optimize the band gap and oxygen-adsorptive capacity, which influences the gas sensing characteristics. Therefore, titanium dioxide (TiO2) materials with different crystal phase structures including rutile TiO2 nanorods (R-TiO2 NRs), anatase TiO2 nanoparticles (A-TiO2 NRs) and brookite TiO2 nanorods (B-TiO2 NRs) were synthesized successfully via one-step hydrothermal process, respectively. The gas sensing characteristics were also investigated systematically. The sensors based on R-TiO2 NRs displayed the higher response value (12.3) to 100 ppm acetone vapor at 320 °C compared to A-TiO2 NRs (4.1) and B-TiO2 NRs (2.3). Furthermore, gas sensors based on R-TiO2 NRs exhibited excellent repeatability under six cycles and good selectivity to acetone. The outstanding sensing properties of gas sensors based on R-TiO2 NRs can be ascribed to relatively narrow band gap and more oxygen vacancies of rutile phase, which showed a probable way for design gas sensors based on metal oxide semiconductors with remarkable gas sensing performances by the crystal phase adjustment engineering in the future.
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Affiliation(s)
- Shuang Cao
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China
| | - Ning Sui
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China
| | - Peng Zhang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China
| | - Tingting Zhou
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China
| | - Jinchun Tu
- State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, PR China.
| | - Tong Zhang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
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Zheng X, Zhang G, Yao Z, Zheng Y, Shen L, Liu F, Cao Y, Liang S, Xiao Y, Jiang L. Engineering of crystal phase over porous MnO 2 with 3D morphology for highly efficient elimination of H 2S. J Hazard Mater 2021; 411:125180. [PMID: 33858115 DOI: 10.1016/j.jhazmat.2021.125180] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 12/27/2020] [Accepted: 01/16/2021] [Indexed: 06/12/2023]
Abstract
In the present work, we report a facile oxalate-derived hydrothermal method to fabricate α-, β- and δ-MnO2 catalysts with hierarchically porous structure and study the phase-dependent behavior for selective oxidation of H2S over MnO2 catalysts. It was disclosed that the oxygen vacancy, reducibility and acid property of MnO2 are essentially determined by the crystalline phase. Systematic experiments demonstrate that δ-MnO2 is superior in active oxygen species, activation energy and H2S adsorption capacity among the prepared catalysts. As a consequence, δ-MnO2 nanosphere with a hierarchically porous structure shows high activity and stability with almost 100% H2S conversion and sulfur selectivity at 210 °C, better than majority of reported Mn-based materials. Meanwhile, hierarchically porous structure of δ-MnO2 nanosphere alleviates the generation of by-product SO2 and sulfate, promoting the adoptability of Mn-based catalysts in industrial applications.
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Affiliation(s)
- Xiaohai Zheng
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Guanqing Zhang
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Zheng Yao
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Yong Zheng
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Lijuan Shen
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China; Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 350007, PR China.
| | - Fujian Liu
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Yanning Cao
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Shijing Liang
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China.
| | - Yihong Xiao
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
| | - Lilong Jiang
- National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, PR China
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Furuya K, Takemoto S, Yamashita S, Sekine H, Yajima Y, Yoshinari M. Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal). Dent Mater J 2020; 39:577-586. [PMID: 31932549 DOI: 10.4012/dmj.2019-090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The objective of this study was to investigate the low temperature degradation characteristics of 2 types of high strength yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) in order to evaluate its suitability for implant body, implant superstructure or abutment. Disk-shaped conventional Y-TZP (0.25 mass% alumina) subjected to hot isostatic press treatment (HIP-Y-TZP) and Y-TZP/4Al2O3 with additional alumina (4.0 mass%) were mirror-polished. Accelerated aging tests with 134°C for 5 h at 0.2 MPa and 180°C for 5 h at 1.0 MPa were performed using an autoclave. Biaxial flexural strength and crystal phases were evaluated. Strength decreased as the proportion of monoclinic phase increased after accelerated aging treatment for both types of high-strength Y-TZPs. Despite the low alumina content, HIP-Y-TZP showed higher static strength and strength after accelerated aging treatment compared to Y-TZP/4Al2O3. However, both types of Y-TZP had adequate strength to be used as dental restorations even after accelerated aging treatment, therefore, its clinical suitability was considered high.
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Affiliation(s)
- Katsunori Furuya
- Department of Removable Partial Prosthodontics, Tokyo Dental College
| | - Shinji Takemoto
- Department of Biomedical Engineering, Iwate Medical University
| | | | - Hideshi Sekine
- Department of Prosthetic Dentistry, School of Dentistry, Ohu University
| | - Yasutomo Yajima
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College
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Danielsen PH, Knudsen KB, Štrancar J, Umek P, Koklič T, Garvas M, Vanhala E, Savukoski S, Ding Y, Madsen AM, Jacobsen NR, Weydahl IK, Berthing T, Poulsen SS, Schmid O, Wolff H, Vogel U. Effects of physicochemical properties of TiO 2 nanomaterials for pulmonary inflammation, acute phase response and alveolar proteinosis in intratracheally exposed mice. Toxicol Appl Pharmacol 2019; 386:114830. [PMID: 31734322 DOI: 10.1016/j.taap.2019.114830] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [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: 10/03/2019] [Revised: 11/12/2019] [Accepted: 11/14/2019] [Indexed: 11/16/2022]
Abstract
Nanomaterial (NM) characteristics may affect the pulmonary toxicity and inflammatory response, including specific surface area, size, shape, crystal phase or other surface characteristics. Grouping of TiO2 in hazard assessment might be challenging because of variation in physicochemical properties. We exposed C57BL/6 J mice to a single dose of four anatase TiO2 NMs with various sizes and shapes by intratracheal instillation and assessed the pulmonary toxicity 1, 3, 28, 90 or 180 days post-exposure. The quartz DQ12 was included as benchmark particle. Pulmonary responses were evaluated by histopathology, electron microscopy, bronchoalveolar lavage (BAL) fluid cell composition and acute phase response. Genotoxicity was evaluated by DNA strand break levels in BAL cells, lung and liver in the comet assay. Multiple regression analyses were applied to identify specific TiO2 NMs properties important for the pulmonary inflammation and acute phase response. The TiO2 NMs induced similar inflammatory responses when surface area was used as dose metrics, although inflammatory and acute phase response was greatest and more persistent for the TiO2 tube. Similar histopathological changes were observed for the TiO2 tube and DQ12 including pulmonary alveolar proteinosis indicating profound effects related to the tube shape. Comparison with previously published data on rutile TiO2 NMs indicated that rutile TiO2 NMs were more inflammogenic in terms of neutrophil influx than anatase TiO2 NMs when normalized to total deposited surface area. Overall, the results suggest that specific surface area, crystal phase and shape of TiO2 NMs are important predictors for the observed pulmonary effects of TiO2 NMs.
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Affiliation(s)
| | | | | | | | | | | | - Esa Vanhala
- Finnish Institute of Occupational Health, Helsinki, Finland
| | | | - Yaobo Ding
- Institute of Lung Biology and Disease, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Anne Mette Madsen
- National Research Centre for the Working Environment, Copenhagen Ø, Denmark
| | | | | | - Trine Berthing
- National Research Centre for the Working Environment, Copenhagen Ø, Denmark
| | - Sarah Søs Poulsen
- National Research Centre for the Working Environment, Copenhagen Ø, Denmark
| | - Otmar Schmid
- Institute of Lung Biology and Disease, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Henrik Wolff
- Finnish Institute of Occupational Health, Helsinki, Finland; Helsinki University, Department of Pathology, Helsinki, Finland
| | - Ulla Vogel
- National Research Centre for the Working Environment, Copenhagen Ø, Denmark; DTU Health Tech, Technical University of Denmark, Kgs. Lyngby, Denmark.
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