JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
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IF 3.442
Li Wang,Junbo Wang,Xiaona Liu,Yaxin Chen,Heping Cheng,Yabin Wu,Hui Peng,Zhen Ma
An FeCeO x solid solution with an Fe/Ce molar ratio of 1 was obtained via a modified sol-gel method. The promotional effect of Fe 3+ ions in the lattice of cubic CeO 2 for catalytic reduction of NO with NH 3 was studied. The NO conversion over the FeCeO x catalyst was obviously higher than those over CeO 2 and Fe 2 O 3 catalysts. FeCeO x was characterized by using XRD , TEM, and XANES , etc. The experimental results revealed that Fe substituted Ce in CeO 2 to form an Fe–O–Ce solid solution with high activity for catalytic reduction of NO. The atomic and electric structures of the FeCeO x catalyst were studied to explain the enhanced catalytic activity.
研究领域:
材料科学
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环境催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Mimi Sun,Jiahui He,Wanting Xiang,Wei Zou,Wenfei Song,Yating Xi,Jun Yan,Meimei Zhou,Pingping Luo
The design and construction of diverse heterojunction architectures have emerged as an effective strategy for enhancing the photocatalytic performance of semiconductors. In this study, ZIF-8/TiO 2 composite nanofibers were successfully fabricated by combining electrospinning technology with a facile in-situ solvothermal method, followed by ZIF-8 sulfurization to form ZnS/TiO 2 nanofiber heterostructures. Comprehensive characterization confirmed that ZIF-8 on the surface of TiO 2 nanofibers was completely converted into ZnS, establishing a robust and intimate interface with TiO 2 . The resulting ZnS/TiO 2 heterojunction exhibited remarkable photocatalytic reduction activity for Cr(VI), achieving 100% removal efficiency within 20 min under visible light irradiation. The photocatalytic reaction rate constant of the ZnS@TiO 2 nanofibers was approximately 10 and 319.5 times higher than those of pristine ZnS and TiO 2 nanofibers, respectively. This enhanced photocatalytic performance is attributed to the formation of the heterojunction, which effectively narrows the bandgap of the composite, optimizes photogenerated charge transfer pathways and significantly improves electron-hole pairs separation. Furthermore, mechanistic studies identified photogenerated electrons (e − ) and superoxide radicals ( O 2 − ) as the dominant active species involved in the photocatalytic reduction process. This work provides both fundamental understanding and practical methodology for developing high-performance TiO 2 -based photocatalytic systems, highlighting their potential for advanced water purification technologies.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 11
·6110-6119
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IF 2.936
Chengkai Pang,Yuqun Zhuo,Qiyu Weng,Zhenwu Zhu
The activity and hydrothermal stability of Cu/SAPO and xMn–2Cu/SAPO for low-temperature selective catalytic reduction of NOx with ammonia were investigated. An ion-exchanged method was employed to synthesize xMn–2Cu/SAPO, which was characterized by N2 adsorption, ICP-AES, X-ray diffraction (XRD), NH3-temperature programmed desorption (NH3-TPD), NO oxidation, X-ray photoelectron spectrum (XPS), UV-vis, H2-temperature programmed reduction (H2-TPR) and diffuse reflectance infrared Fourier transform spectra (DRIFTS). 2Mn–2Cu/SAPO and 4Mn–2Cu/SAPO showed the best SCR activity, in that at 150 °C NO conversion reached 76% and N2 selectivity was above 95% for the samples. NO oxidation results showed that the 2Mn–2Cu/SAPO had the best NO oxidation activity and the BET surface area decreased as manganese loading increased. XRD results showed that the metal species was well dispersed. NH3-TPD showed that the acid sites have no significant influence on the SCR activity of xMn–2Cu/SAPO. H2-TPR patterns showed good redox capacity for xMn–2Cu/SAPO. UV-vis and H2-TPR showed that the ratio of Mn4+ to Mn3+ increased as manganese loading increased. XPS spectra showed a significant amount of Mn3+ and Mn4+ species on the surface and addition of manganese increased the ratio of Cu2+. The promotion effect of manganese to 2Cu/SAPO comes from the generation of Mn3+ and Mn4+ species. Deduced from the DRIFTS spectra, the Elay–Rideal mechanism was effective on 4Mn–2Cu/SAPO.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Yun Tian,Luowen Xu,Shuo Ning,Changfu Wang,Yun Wang,Hao Jiang,Dingzhong Yuan,Fengtao Yu,Yan Liu
Photocatalysis has emerged as a extremely promising green technology for the treatment of uranium-containing wastewater. This study focuses on the fabrication of Ti 3 C 2 T x /Cd 0.8 Zn 0.2 S composites with Schottky junctions through the in-situ growth of Cd 0.8 Zn 0.2 S on Ti 3 C 2 T x nanosheets, enabling efficient photoreduction of U(VI) without the requirement of sacrificial agents. The results demonstrate that the Ti 3 C 2 T x /Cd 0.8 Zn 0.2 S composites achieve remarkable 99.48 % U(VI) reduction efficiency within 60 min in a 100 ppm uranium solution. Furthermore, the removal rate remains above 90 % after five cycles. The formation of Schottky heterojunctions by Ti 3 C 2 T x and Cd 0.8 Zn 0.2 S leads to the generation of an internal electric field that significantly promotes the rapid separation and transfer of photogenerated carriers, thereby enhancing the photocatalytic reduction efficiency of Ti 3 C 2 T x /Cd 0.8 Zn 0.2 S-3:100 (TC/CZS-3:100). A considerable amount of electrons accumulate on Ti 3 C 2 T x via the Schottky barrier, effectively facilitating the reduction of U(VI) to U(IV). As a co-catalyst, Ti 3 C 2 T x enhances the photocatalytic performance and stability of Cd 0.8 Zn 0.2 S. Moreover, the practical application in the waste liquid of rare earth tailings reveals that the removal rate can be as high as 91.24 %. This research is of significant value in the development of effective photocatalysts for the elimination of uranium from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qiang Li,Hao Zhou,Meng Tan,Lingxuan Yang,Xiao Hu,Guoxiang Yang,Hao Du,Qing Wei,Qi Wang
High visible light utilization and rapid charge separation are of great importance for environmental photocatalysis . Single photocatalyst always suffers from high recombination of photogenerated electron-hole pairs and low redox ability. Elemental doping and heterojunction construction are effective approaches to improve the photocatalytic performance. Herein, we designed and synthesized a novel Bi x Fe y VO 4 /g-C 3 N 4 (BFC) binary heterojunction via facile coprecipitation followed by calcination processes. The doping of Fe endows BiVO 4 with narrower bandgap, which boosts its light response and redox ability. The construction of heterojunction facilitates charge separation that makes BFC heterojunction displaying much higher photocatalytic activity than those of single semiconductors. The highest Cr(VI) photoreduction rate ( k ) of BFC binary heterojunction is 78 (45) times of BiVO 4 (FeVO 4 ). Additionally, the binary heterojunction can still maintain high photoreduction efficiency (98%) of Cr(VI) even after five cycling tests showing excellent photocatalytic stability. This research provides novel idea for synergistic application of doping and heterojunction in environmental photocatalysis.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fang Wang,Yun Liao,Tingting Li,Liangshu Xia
Uranium (VI) removal and recovery from wastewater is crucial for sustainable development of nuclear energy and environmental remediation. Among various techniques, the photocatalytic reducing uranium (VI) to immobile uranium (IV) has been regarded as one of the most effective strategies. As a result, the design and fabrication of photocatalysts have attracted extensive attention. In this study, g-C 3 N 4 decorated dendritic fibrous nano-silica was fabricated first and then coupled with CdS. The fibrous photocatalyst showed high surface area and extended visible light absorption. More importantly, it exhibited a satisfying performance for the photocatalytic reduction of uranium (VI) under air atmosphere with solar irradiation. The SEM images and XPS spectrum confirmed that uranium (VI) was indeed photo-reduced to uranium (IV). Meanwhile, quenching experiments showed that O 2− played a key role in uranium (VI) reduction.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 11
·2481-2487
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IF 4.674
Yani Zhang,Yue Peng,Chizhong Wang,Kezhi Li,Shuai Liu,Xiansheng Li,Jianjun Chen,Junhua Li
Graphical Change for copper : Copper ion exchanged SAPO-47 zeolite catalysts are synthesized and used for the selective catalytic reduction (SCR) of NO x with ammonia, for which they exert high activity. The structure–activity relationship is explored. Copper-exchanged H-SAPO-47 zeolites were synthesized by an aqueous solution ion exchange method and applied in the selective catalytic reduction of NO with NH 3 (SCR). The microporous chabazite (CHA) structure of the catalysts was characterized and confirmed using synchrotron X-ray diffraction and nitrogen adsorption–desorption experiments. The synthesized Cu x -SAPO-47 catalysts exhibited excellent SCR activity and nearly 100 % N 2 selectivity in a wide temperature range. The Cu 0.1 -SAPO-47 sample exhibited higher activity than the other samples below 250 °C. The weak Lewis acid sites originating from the introduction of Cu 2+ were more active than the Brønsted acid sites of the zeolites framework at low temperature. Two types of isolated Cu 2+ species with different coordination surroundings were found, namely, Cu 2+ cations bonded with the six-membered rings and those bonded in the CHA cages. The former species exhibited good stability and activity at high temperature, whereas the latter ones were more active at low temperature. The Cu 0.1 -SAPO-47 catalyst provided a considerable amount of isolated Cu 2+ bonded in the CHA cages. These results indicated that active Lewis acid sites and isolated Cu 2+ species are responsible for their excellent SCR activity.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 18
·6271-6280
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IF 6.119
Jiaqi Dong,Jianqiang Hu,Anyu Liu,Jiale He,Qingling Huang,Yanru Zeng,Wenjing Gao,Zhen Yang,Yongcai Zhang,Yong Zhou,Zhigang Zou
Direct Z-scheme MgIn2S4/Bi2WO6 hierarchical heterostructures were simply fabricated via immobilising MgIn2S4 nanoflakes onto the surface of Bi2WO6 hierarchical nanosheet-like structures towards photocatalytic reduction of Cr(VI). The analyses of the energy band structure, UPS tests and DMPO-ESR spin-trap experiments confirm that the intimate MgIn2S4/Bi2WO6 heterointerface allows an efficient Z-scheme interfacial charge migration route between MgIn2S4 and Bi2WO6, leading to higher redox ability of photoexcited carriers, and thus favours the separation of photoexcited carriers, proved by the results of PL spectroscopy, photoluminescence decay traces, transient photocurrent densities and EIS. In addition, the MgIn2S4/Bi2WO6 heterostructures also exhibit obviously enhanced ultraviolet-visible-light absorption according to UV-vis DRS analysis, and can generate more electron–hole pairs under UV-visible light illumination, effectively improving the photocatalytic activity. Therefore, because of their synergistic effects, all the MgIn2S4/Bi2WO6 hierarchical heterostructures show distinctly improved photoreduction activities for Cr(VI), compared with pure Bi2WO6. The optimal hybrid (MIS/BWO-0.35) displays nearly 100% Cr(VI) reduction into Cr(III) after 40 min of simulated sunlight illumination, which is better than the majority of the reported Bi2WO6 and other semiconductor photocatalysts before. Its reaction rate constant for the photoreduction of Cr(VI) (0.1063 min−1) is about 4.5 times higher than that of the pristine Bi2WO6 (0.0237 min−1). This work provides a valid approach for developing efficient Z-scheme photocatalytic materials in removing Cr(VI).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jinghao Hua,Sheng Feng,Changchang Ma,Haitao Huang,Kai Wei,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian
In this study, a novel 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst was prepared by combining NiFe-LDH with Bi 5 O 7 Br through self-assembly. Under simulated solar irradiation, compared with pure NiFe-LDH and Bi 5 O 7 Br, the 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst revealed a significant improvement in the efficiency of photocatalytic reduction of CO 2 . Z-scheme heterojunction promotes the separation of photo generated charge carriers and 2D/2D structure is conducive to exposing more active site and enhancing the migration rate of interface carriers. The photocatalytic activity experiment revealed that the CH 4 production efficiency of the Bi 5 O 7 Br/NiFe-LDH (37.77 μmol/g/h) after 8 h of light exposure was 2 times and 10 times that of Bi 5 O 7 Br (22.41 μmol/g/h) and NiFe-LDH (3.84 μmol/g/h), respectively. The successful formation of Z-scheme heterojunction was determined through band analysis and related characterization. The advantage of Z-scheme heterojunction is that it has high electron mobility and low resistivity. This work launches a feasible design strategy of special structure photocatalysts to enhance the photocatalytic activity for the CO 2 reduction.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yidan Luo,Puxin Xu,Chao Liu,Huiyin Ye,Ke Peng,Shuohan Yu,Mingshan Xue,Yu Xie,Luhui Wang
Constructing heterostructures is an effective method for enhancing photocatalytic efficiency. Herein, a two-dimensional (2D)/2D heterojunction of NiAl-LDH/BiOBr with a built-in electric field (BIEF) was firstly synthesized. The photocatalytic efficiency of CO 2 reduction was assessed under visible light. And the findings revealed that the composite with 10 wt% NiAl-LDH demonstrated the highest CO 2 photoreduction performance, yielding a rate of 10.7 μmol·g −1 ·h −1 for CO generation, which was 21.4 and 4.3 times higher than that of pure NiAl-LDH and BiOBr. The heterojunction of the sample was type-II heterojunction with the analysis of XPS, band structures, and in-situ XPS. Photoluminescence (PL) and electrochemical tests demonstrated that the type-II heterojunction between NiAl-LDH and BiOBr efficiently enhanced the separation and transfer of electrons and holes, consequently boosting the photocatalytic performance. Besides, in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) was employed to reveal the reaction intermediates of CO 2 . This work provides experimental approaches and theoretical development of nanocomposite for photoreduction of CO 2 .
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yulong Xiang,Xinbin Ji,Xiaoli Dong,Yu Wang,Nan Zheng,Chundong Liu,Menglin Wang,Chumin Yan
Photoreduction of toxic Cr(VI) in wastewater to less toxic Cr(III) presents an effective approach to address the environmental issues. Nevertheless, the photocatalytic performance of these photocatalysts is severely constrained by their narrow light absorption range and the rapid recombination of photo-generated electrons and holes. Herein, DUT-67/Fe 2 O 3 heterojunction photocatalysts were prepared by a simple mechanical grinding method. The formation of DUT-67/Fe 2 O 3 heterostructures not only increased the specific surface area and light absorption range, but also improved the separation of photogenerated charge carriers. Compared to the pristine DUT-67, DUT-67/Fe 2 O 3 exhibited significantly improved photocatalytic performance in the reduction of Cr(VI), achieving a reduction efficiency of up to 94 % within 40 min. Active species trapping experiments identified that electrons served as the primary species in the photocatalytic process. Coupled with electron spin resonance and density functional theory (DFT) calculations, a comprehensive mechanism for the photocatalytic reduction of Cr(VI) by DUT-67/Fe 2 O 3 Z-scheme heterojunction was proposed. This work offers new insights into the underlying mechanisms involving in the interfacial charge transfer and Cr(VI) photoreduction processes.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Guang Lu,Lunqiu Zhang,Jiling Liang,Wei Li,Zheng Li,Xuejun Zou,Xiaodong Zhang
Herein, first, MIL-125 samples were synthesized via a hydrothermal method. Then, Ag species were doping on the surface of MIL-125 samples via the photolysis of silver nitrate. Finally, the Z-scheme MIL-125/Ag/BiOBr composite was synthesized via a directed liquid assembly method. The structure, morphology, and optical properties of the prepared samples were investigated via X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopic mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption analysis, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, surface photovoltage analysis, transient photocurrent response analysis, electrochemical impedance spectroscopy, and electron spin resonance analysis. Photocatalytic experiments indicated that the photocatalytic Cr6+ reduction efficiency of MIL-125/Ag/BiOBr heterojunctions was 85.7% at pH = 6, which was approximately 5.5 and 2.2 times higher than that using BiOBr and MIL-125 alone, respectively. This performance was attributed to the intimate interfacial contact between MIL-125 and BiOBr and the doping of Ag species, which increased the transfer and separation of photogenerated carriers and inhibited the recombination of electrons and holes. Furthermore, the possible photocatalytic Cr6+ reduction mechanism of the Z-scheme MIL-125/Ag/BiOBr photocatalyst was proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）