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JOURNAL OF ENVIRONMENTAL SCIENCES
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Summary: In this study, Co3O4 materials with different morphologies were fabricated and the effect of water on their catalytic activity was investigated. The results showed that spherical Co3O4 displayed the best catalytic activity under dry conditions, while rod-like Co3O4 exhibited the best water resistance under humid conditions. Correlative characterizations and DFT calculations were used to reveal the mechanism behind water's effect.
Review
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Huidong Lin et al.
Summary: Metal-organic frameworks (MOFs) with ultra-high specific surface area and adjustable porosity have significant application potential in water contaminant removal. However, the powdery microcrystalline structure of MOFs poses challenges in practical applications, such as pipe blockage, secondary pollution, and short service life. This review systematically summarizes the synthesis strategies of macroscopic MOFs in various forms, including beads, fibers, and aerogels. Furthermore, the removal efficiency, elimination mechanism, and influencing factors of macroscopic MOFs in practical wastewater treatment applications are reviewed from four aspects: oil and organic solvent removal, dye removal from contaminated waters, heavy metal ion removal, and brackish water and seawater desalination. This study aims to highlight recent trends in the industrial-scale application of macroscopic MOFs materials.
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Elena M. Slavinskaya et al.
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JOURNAL OF CATALYSIS
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Renzhi Rao et al.
Summary: This paper reviews the recent applications of heterogeneous catalytic technologies in the degradation of volatile organic compounds (VOCs), including photocatalysis, thermal catalysis, and other catalytic approaches. It highlights the applications of metal organic frameworks (MOFs) and their derivatives in VOCs degradation, such as the progress of MOF-derived metal oxides in the treatment of toluene. The mechanisms of VOCs degradation by different catalytic approaches are systematically presented, and the views and directions of VOCs treatment technology development are discussed.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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Zhenyuan Zhao et al.
Summary: In this work, the intermediate products in the process of eliminating various VOCs by different catalytic technologies are systematically reviewed. The advantages and disadvantages of various catalytic technologies in the control of by-products are described based on intermediates analysis. The paper also focuses on the detection techniques of characteristic intermediates in VOCs elimination, and discusses the characterization methods and their usage conditions. Several factors that affect the formation and conversion of intermediates are provided, especially the effects of catalysts surface metal capacity and oxygen species on intermediates. The review is believed to provide a good basis and reference point for the exploration of VOCs catalytic oxidation pathways and the analysis of intermediate products.
SEPARATION AND PURIFICATION TECHNOLOGY
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Wenxin Guo et al.
Summary: In this study, a highly efficient 3D hierarchical porous oxygen reduction reaction (ORR) catalytic system was developed by incorporating stable and multiaperture zirconia (ZrO2) and conductive N-doped carbon (NC) into a Pt-based catalyst. The Pt-ZrO2 interface greatly enhances the activation of O2, while the hierarchical porous structure of a NC-encapsulated nanoframework promotes mass diffusion and electron transfer, leading to improved ORR activity and stability. This catalytic system exhibits significantly higher mass activity/specific activity than commercial Pt/C, and shows negligible activity decay and morphological stability after long-term cycling. The integration of hierarchical porous systems for optimizing the geometric and electric structure of Pt-based catalysts has great potential for practical proton exchange membrane fuel cells (PEMFCs).
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Summary: In this study, a novel Pt nanoparticles catalyst was designed with cable-like carbon nanotubes@SnO2 core@shell supports with regulable electronic metal-support interaction. The experimental results showed that this catalyst exhibited excellent activity and record-high durability in fuel cells, surpassing the reported Pt-based catalysts and meeting the targets set by the U.S. Department of Energy.
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Shenghao Zhao et al.
Summary: This paper reviews recent research advances in improving the performance of catalysts for the degradation of gaseous pollutants based on controlling oxygen vacancies (OVs). The relationship between OVs and the degradation performance of typical gaseous pollutants is elucidated, and various approaches for generating and characterizing OVs in catalysts are summarized. The challenges and future opportunities for the development of oxygen-deficient catalysts are also discussed in this review.
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Borui Jie et al.
Summary: This review explores the application of luminescent metal organic frameworks (LMOFs) in detecting pollutants. The relationship between detection mechanism and signal emission is analyzed based on the structural characteristics of LMOFs, and various strategies for constructing and synthesizing LMOFs are proposed. Additionally, recent research progress in using LMOFs as fluorescent sensors to distinguish different types of pollutants is systematically summarized.
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Summary: This paper reviews the research progress in the catalytic oxidation of VOCs in the simulated flue gas, focusing on the effects of different components of flue gas on the structure and activity of catalysts. The promotion and inhibition effects of water, SO2, NOx, Cl, CO2, and heavy metals in the actual industrial flue gas on the structure and performance of the catalyst are discussed. Methods to improve the antitoxicity of the catalyst are reviewed, and the challenges and prospects of antitoxicity catalysts for VOCs are proposed.
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Ning Liu et al.
Summary: In the pursuit of restoring the natural equilibrium of our planet, the development of photocatalytic agents for CO2 reduction is crucial. A composite material HTiNbO5/ UiO-66 (UTi) was synthesized and showed significant improvement in the photoreduction efficiency of CO2 compared to pristine UiO-66 and HTiNbO5. The enhanced photocatalytic performance was attributed to increased specific surface area, improved visible-light absorption range, and reduced energy band gap.
SURFACES AND INTERFACES
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Jun Duan et al.
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CHINESE CHEMICAL LETTERS
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Menglan Xiao et al.
Summary: The study focused on the electronic metal-support interaction to enhance the catalytic performance of Pt@Co3O4 catalysts in toluene degradation. The catalyst showed excellent activity, water resistance, and long-term stability. Surface oxygen species played a crucial role in toluene degradation and could efficiently be replenished by gaseous oxygen.
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Dingren Ma et al.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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Yiqiong Yang et al.
Summary: Highly dispersed Pt nanoparticles supported UiO-66 catalysts were successfully prepared and their thermal catalytic performances were evaluated by toluene degradation. The catalysts exhibited good catalytic performance in high weight hourly space velocity, stability, and water resistance test, and their performance was enhanced in the reusability test, possibly due to a Pt-0-PtO synergistic catalytic mechanism and phase transition between Pt-0 and PtO.
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Quanxin Du et al.
Summary: This review summarizes the applications of zirconium-based metal-organic frameworks (Zr-MOFs) in adsorption, photocatalysis, and catalytic removal of pollutants. It also discusses the combination of metals with Zr-MOFs, their structure characteristics, and future prospects.
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Yang Yang et al.
Summary: The unique properties presented in the interface of composite oxides have important implications for catalytic degradation. In this study, MOx/TiO2 composites were used for the full spectrum light-assisted photothermal catalytic degradation of toluene. A p-n heterojunction with interface defects was constructed between TiO2 and Co3O4, leading to improved photothermal performance. The relationship between interface properties, band structure, and catalytic performance was comprehensively studied based on experimental results and theoretical calculations.
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Qiangyu Zhao et al.
Summary: This study prepared defective UiO-67 by changing the amount of benzoic acid and tested its adsorption performance on VOCs. The results showed that the 67-ben-10 sample achieved the maximum toluene adsorption capacity, and the adsorption performance was also related to the characteristics and size of VOCs molecules.
CHEMICAL ENGINEERING JOURNAL
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Shuangju Li et al.
Summary: A series of NbCoOx catalysts with different Nb/Co molar ratios were synthesized to investigate their catalytic activity and mechanism in the oxidation of toluene. Nb0.62Co0.33Ox exhibited the highest efficiency in toluene combustion, possibly due to the incorporation of amorphous niobium providing sufficient surface acid sites and oxygen vacancies.
APPLIED CATALYSIS A-GENERAL
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Yuhai Sun et al.
Summary: This study investigated the mechanism of plasma catalytic toluene degradation using a series of Mn-based catalysts. The interaction between plasma and Ag-Mn/γ-Al2O3 was found to enhance the utilization of plasma-induced active oxygen species and chemically adsorbed oxygen. The possible ring-opening mechanisms over different catalysts were proposed after analyzing the evolution of typical intermediates.
JOURNAL OF CLEANER PRODUCTION
(2022)
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Chemistry, Physical
Jinfeng Chen et al.
Summary: This study presents a new strategy to enhance the charge transfer from Zr atoms in UiO-66 to black phosphorus (BP) for the photocatalytic degradation of toluene and o-dichlorobenzene. The formation of Zr-P bonds is the key to improve the charge-transfer capability of BP-UiO, which is encapsulated by a hydrophilic porous mesh-like UiO-66 layer. BP-UiO shows enhanced visible-light-harvesting ability, charge transport capability, and photocatalytic activity. In situ IR and GC-MS techniques are used to investigate the degradation pathways of contaminants.
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Chemistry, Physical
Chao Meng et al.
Summary: Carbon neutrality has brought worldwide attention to the exploration of CO2 hydrogenation to methanol, with the need for groundbreaking catalysts. A highly efficient InNi3C0.5/Fe3O4 catalyst was developed by finely tuning the electronic metal-support interaction (EMSI) using Fe3O4 precursor. The catalyst achieved a significantly higher turnover frequency compared to other Fe3O4 precursors, indicating the correlation between oxygen deficiency and EMSI-governed activity. Enhanced EMSI made the catalyst more electron-enriched, allowing easy dissociation of CO2. The InNi3C0.5/Fe3O4-N catalyst showed excellent performance in terms of methanol space time yield, selectivity, and resistance to sintering and sulfur poisoning.
APPLIED CATALYSIS B-ENVIRONMENTAL
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Weili Dai et al.
Summary: In this study, Na-doped Co3O4 was used as a photothermal catalyst to achieve complete mineralization of toluene by utilizing the oxygen vacancies (OVs). Doping sodium into Co3O4 created distortion and charge disequilibrium in the lattice, resulting in abundant OVs. These OVs acted as specific centers to convert absorbed O-2 molecules into active oxygen species, leading to the efficient decomposition of toluene. The Na-doped Co3O4 exhibited significantly higher CO2 yield and mineralization degree compared to pure Co3O4 under full-spectrum light irradiation.
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Xiaodong Zhang et al.
Summary: In this work, alkali metal-doped manganese-based metal-organic framework (Mn-MOF) derivative materials were obtained and their catalytic activities in toluene oxidation were studied. The results showed that the Na-doped Mn-MOF derivatives exhibited higher catalytic activity due to their larger specific surface area, lower average manganese valence, and better adsorbed oxygen mobility. Furthermore, the addition of alkali metal and the presence of water in the reaction atmosphere promoted the mineralization of toluene.
JOURNAL OF CATALYSIS
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Xiaodong Zhang et al.
Summary: Supported single-atoms and sub-nanometre clusters have shown excellent catalytic performance in many reactions, but they are prone to inactivation in complex reactive conditions. This study demonstrates that Pd-UiO-66 catalyst with ultra-low Pd loading contains active Pd species (isolated Pd atom, sub-nanometre Pd clusters, and Pd nanoparticles), and exhibits superb activity for toluene oxidation and water resistance.
JOURNAL OF CATALYSIS
(2022)
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Fukun Bi et al.
Summary: In this study, Pd@ZrO2 catalysts with high chlorine resistance were prepared using a Zr-based metal-organic framework (MOF) as a sacrificial template. The catalyst exhibited excellent water resistance, long-term stability, and resistance to CO and dichloromethane (DCM) for volatile organic compound (VOC) elimination. The results suggest that this work provides a new strategy for designing high-chlorine resistance catalysts to improve the atmospheric environment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
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Chemistry, Physical
Qiangyu Zhao et al.
Summary: In this paper, a solvothermal synthesis method was proposed for the preparation of UiO-67/GO hybrid nanocomposites. The composites exhibited excellent adsorption capacity for toluene, with the optimal synthesis condition resulting in a maximum adsorption capacity of 876 mg g(-1) for 67/GO-0.5%. The improved adsorption performance was attributed to the presence of graphene oxide, which enhanced p-p interaction, promoted defect generation, and provided more adsorption sites. The regeneration performance of the adsorbent was also verified. The adsorption mechanism involved the cooperation of defects, pi-pi interaction, and hydrogen bonding.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
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Yang Yang et al.
Summary: This study improves the photothermal catalytic performance of toluene by introducing oxygen vacancies (Vo) into a Co3O4/TiO2 composite. The Vo activates adsorbed molecular oxygen (O-2) to form reactive oxygen species, promoting deep oxidation of toluene. In addition, Vo captures excited electrons and inhibits the direct recombination of electron-hole pairs, thus promoting the photochemical process.
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Jingling Yang et al.
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Yanfei Jian et al.
Summary: The low-temperature degradation of short chain alkanes is a major challenge in purifying volatile organic compounds. Co3O4 nanomaterials with different crystal facets were fabricated, and rod-like structures showed the highest activity due to their unique properties. The rod-like structure of Co3O4 has the lowest formation energy of oxygen vacancies on the (110) facet, making it an efficient catalyst for propane oxidation.
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Jianfei Yao et al.
Summary: Hierarchical Co3O4/MnOx and MnOx/Co3O4 nanoarrays were successfully prepared on Ni foam by primary and secondary hydrothermal processes, showing excellent catalytic performance in toluene oxidation. The monolithic MnOx/Co3O4/NF catalyst exhibited the highest activity and stability, potentially replacing noble-metal catalysts. XPS and H-2-TPR analysis confirmed the presence of active species and good interaction between metals, while in situ DRIFTs results revealed key intermediates and reaction paths in the toluene combustion process.
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(2021)
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Xiaodong Zhang et al.
Summary: The 3Mn2Ce catalyst shows superior catalytic performance and stability under high humidity conditions, mainly attributed to the formation of a solid solution between Ce and Mn species and better reducibility. The introduction of water can promote toluene mineralization by activating oxygen vacancies and facilitating the degradation pathway of toluene.
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Environmental Sciences
Mingyuan Zhang et al.
Summary: A Pt-Co(OH)(2)-O catalyst was prepared by metal-organic templates conversion, showing enhanced catalytic performance and stability due to strong metal-support interaction. The in situ analysis revealed that SMSI promoted oxygen migration in the catalyst, facilitating catalytic reactions.
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Jiahui Lu et al.
Summary: A facile hydrothermal method is used to prepare a CuO-CeO2 catalyst for toluene oxidation, showing higher catalytic performance compared to pure CeO2 and CuO. The Cu1Ce2 catalyst promotes electron transfer and oxygen species mobility, leading to faster reaction rates and improved efficiency in toluene oxidation.
CHINESE CHEMICAL LETTERS
(2021)
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Sung Hyok Ri et al.
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Longwen Chen et al.
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