ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 24
·35678-35687
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IF 0
Qing Qishun,Zhu Shouwang,Jin Hongyang,Mei Tianhong,Liu Wei,Zhao Songjian
This study effectively addresses the rapid deactivation of manganese-based catalysts in humid environments during ozone decomposition by introducing iron-doped manganese oxide octahedral molecular sieve (Fe-OMS-2) catalysts supported on activated carbon (AC). By optimizing the doping ratio of Fe-OMS-2, the Fe-OMS-2 0.5 /AC catalyst achieves nearly 100% ozone decomposition efficiency across a wide range of relative humidity levels (0 to 60%), even at elevated air flow rates of 800 L·g −1 ·h −1 , outperforming standalone AC, Fe-OMS-2, or a simple mixture of OMS-2 and AC. The Fe-OMS-2 0.5 /AC catalyst features a porous surface and a mesoporous structure, providing a substantial specific surface area that facilitates the uniform distribution of the Fe-OMS-2 active phase on the AC surface. The incorporation of Fe 3+ ions enhances electron transfer between valence state transitions of Mn, thereby improving the catalyst’s efficiency in ozone decomposition. Additionally, the AC component protects catalytic sites and enhances the catalyst’s humidity resistance. In conclusion, this research presents a novel strategy for developing highly efficient and cost-effective ozone decomposition catalysts that enhance dehumidification, significantly contributing to industrial ozone treatment technologies and advancing environmental protection.
研究领域:
环境科学
·
催化
·
材料科学
·
空气质量控制
✓ 已验证
产品关联
DOI
PubMed
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chen Cai,Jiayin Chen,Wei Fu,Shuying Ning,Hao Zhou,Muhammad Kashif,Yaxin Su
The Ce-modified OMS-2 catalyst (Ce x -OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce 0.08 -OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O 2 and N 2 were used as equilibrium gases, and the N 2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce 0.08 -OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO 2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H 2 -TPR, NH 3 -TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Ce x -OMS-2 catalyst is facilitated by lower agglomeration and crystallinity , larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn 4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jun Li,Peng Ye,Jia Fang,Manye Wang,Deming Wu,Aihua Xu,Xiaoxia Li
Manganese oxide octahedral molecular sieves (OMS-2) supported CuO catalysts were synthesized, characterized and used in the removal of Acid Orange 7 (AO7) in aqueous solution by an oxidation process involving peroxymonosulfate (PMS). It was found that the CuO species were highly dispersed in OMS-2 with a high ratio of easily reduced surface oxygen species. The synergetic effect between CuO and OMS-2 significantly improved the dye degradation rate and catalytic stability, compared with CuO, OMS-2 and supported CuO on other materials. About 97% of the dye was removed within 15 min at neutral solution pH by using 0.2 g/L of CuO/OMS-2 and PMS. The effect of initial solution pH, PMS concentration, reaction temperature and CuO content in the composites on AO7 degradation was also investigated. Mechanism study indicated that SO 4 − radicals generated from the interaction between PMS and Mn and Cu species with different oxidation states, mainly accounted for the degradation.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·
IF 5.6
Qiu Yuhua,Huang Yingping,Wang Yanlan,Liu Xiang,Huang Di
Advanced processes for peroxymonosulfate (PMS)-based oxidation are efficient in eliminating toxic and refractory organic pollutants
from sewage. The activation of electron-withdrawing HSO
− 5
releases reactive species, including sulfate radical (·SO
− 4
), hydroxyl radical (·OH), superoxide radical (·O
− 2
), and singlet oxygen ( 1 O 2 ), which can induce the degradation of organic contaminants. In this work, we synthesized a variety of M-OMS-2 nanorods (M = Co, Ni, Cu, Fe) by doping Co 2+ , Ni 2+ , Cu 2+ , or Fe 3+ into manganese oxide octahedral molecular sieve (OMS-2) to efficiently remove sulfamethoxazole (SMX) via PMS activation. The catalytic performance of M-OMS-2 in SMX elimination via PMS activation was assessed. The nanorods obtained in decreasing order of SMX removal rate were Cu-OMS-2 (96.40%), Co-OMS-2 (88.00%), Ni-OMS-2 (87.20%), Fe-OMS-2 (35.00%), and OMS-2 (33.50%). Then, the kinetics and structure–activity relationship of the M-OMS-2 nanorods during the elimination of SMX were investigated. The feasible mechanism underlying SMX degradation by the Cu-OMS-2/PMS system was further investigated with a quenching experiment, high-resolution mass spectroscopy, and electron paramagnetic resonance. Results showed that SMX degradation efficiency was enhanced in seawater and tap water, demonstrating the potential application of Cu-OMS-2/PMS system in sewage treatment.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Peng Ye,Deming Wu,Manye Wang,Yi Wei,Aihua Xu,Xiaoxia Li
A heterogeneous magnetic CuFe 2 O 4 @OMS-2 catalyst was fabricated through a facile solvent-free process using Mn(CH 3 COO) 2 and KMnO 4 in the presence of CuFe 2 O 4 . It was found that the BET surface area of OMS-2 as well as the ratio of low-valent manganese species significantly increased in the hybrid catalyst, due to interactions between CuFe 2 O 4 and the precursor of amorphous manganese oxide . Acid Orange 7 (AO7) and other organic pollutants could be completely degraded by the CuFe 2 O 4 @OMS-2 catalyst within 30 min in the presence of peroxymonosulfate (PMS), while CuFe 2 O 4 and OMS-2 showed no significant activity for the reaction. The hybrid catalyst also exhibited excellent long-term stability and could be easily recovered with the assistance of an external magnetic field. A possible degradation mechanism for the synergistic effects of different valent metal species and reactive radicals was proposed, which involved the electron transfer from Mn(III) or Mn(II) species to PMS with the generation of sulfate and hydroxyl radicals, and from AO7 and Cu(I) in CuFe 2 O 4 to Mn(IV) and Mn(III) to reduce these Mn species.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Shuhui Wang,Yu Huang,Xu Meng,Xiang Liu
Manganese oxide octahedral molecular sieves (OMS-2) are important environmental oxidants and catalysts in sewage treatment; however, most existing work has only focused on its catalytic activity . In this work, we first report the highly efficient and heterogeneous OMS-2 for the directly oxidative degradation of organic dyes (including reactive red 2, reactive blue 19, acid orange 7, rhodamine B and methylene blue), via a non-radicals process, under acidic condition. Then the effects of OMS-2 concentration, pH condition, reaction temperature and initial concentration of organic dye have been investigated for directly oxidative degradation. In addition, OMS-2 has been successfully recycled at least five times for directly oxidative degradation without any obviously decrease in activity. These findings provide general guidance for designing active OMS-2 for cost-effective water and wastewater treatment.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Enhui Du,Mingxin Lv,Hongli He,Zhilin Chen,Jie Yang,Liyuan Huai,Yuxiang Chen,Jian Zhang
Exciting opportunities in biomass catalytic conversion have spurred extensive research and development into the chemical utilization of 5-hydroxymethylfurfural (HMF) and its derivatives. In this study, we achieved the efficient base-free aerobic oxidation of HMF-derived tetrahydrofuran-2,5-dimethanol (THFDM) to tetrahydrofuran-2,5-dicarboxylic acid (THFDCA) on Pt/OMS-2 catalyst, offering a potential alternative to petroleum-based 1,4-cyclohexanedicarboxylic acid (CHDA). Oxygen vacancies on the catalyst support played a crucial role in the oxidation process by enhancing surface lattice oxygen mobility and facilitating the oxidation of THFDM via the Mars-van Krevelen (MvK) mechanism. This in-depth exploration of bio-based products presents a promising avenue for the production of high-value building blocks.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dilong Qiang,Hongyang Jin,Qishun Qing,Su Wang,Tianhong Mei,Zhen Li,Songjian Zhao
In response to the issue of poor stability in the catalytic decomposition of ozone by manganese oxide catalysts, this study evaluates the ozone decomposition capabilities of octahedral molecular sieves of manganese oxide (OMS-2) doped with various metals. Iron-doped OMS-2 (Fe-OMS-2) was identified as the most structurally compatible catalyst with OMS-2 for further investigation. Performance tests indicated that the OMS-2 doped with 10 % Fe and calcined at 300°C (10 %Fe-OMS-2–300°C) achieved a 100 % ozone conversion rate at the onset of the reaction, with no significant decrease in activity after 24 hours. The characterization analysis showed that the 10 % Fe-OMS-2–300°C presented higher surface area and more oxygen vacancies compared with OMS-2. Furthermore, the reaction mechanism analysis indicated that the Mn 3+ and oxygen vacancies of the 10 % Fe-OMS-2 catalyst were vital for ozone decomposition. The existence of Fe can increase the oxygen vacancies and accelerate electron transfer to promote valence state transitions between Mn species in the material. This paper aims to provide a reference for the development of an efficient, safe, and economical ozone decomposition catalyst.
研究领域:
环境科学
·
催化
·
材料科学
·
大气化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）