Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Mengyang Xu,Xiaoxue Zhao,Haopeng Jiang,Songtao Chen,Pengwei Huo
Converting carbon dioxide into valuable chemicals is seen as a promising strategy for slowing global warming while enriching energy supplies. Photocatalysts derived from Metal-Organic Frameworks (MOFs) can not only overcome the problem of poor stability of MOFs, but also inherit the advantages of MOFs to some extent. Herein, carbon doped In 2 O 3 (C-In 2 O 3 ) hollow tubular is synthesized by calcination of MIL-68(In) as sacrificial template. Then C-In 2 O 3 and g-C 3 N 4 are hydrothermal to obtain C-In 2 O 3 /g-C 3 N 4 heterojunction . The unique hollow tubular structure, carbon doping and type-II heterojunction of C-In 2 O 3 /g-C 3 N 4 expand the light absorption capacity and promote the separation of photogenerated electron-hole pairs, thus significantly improve the activity of photocatalytic reduction of CO 2 . Among them, C-In 2 O 3 /g-C 3 N 4 -5 shows the highest CO 2 reduction activity towards CO (153.42 μmol/g/h) and CH 4 (110.31 μmol/g/h).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Yuxuan Wang,Chenhui Qiu,Yujing Xie,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Using perovskite photocatalytic reduction of CO2 and H2O to produce hydrocarbon fuels offers an attractive method to solve the energy crisis and the greenhouse effect. Bi4Ti3O12 (BTO) has received much attention in the field of photocatalysis due to its unique layered structure, but it still faces many challenges such as weak photoresponse and severe photogenerated carrier recombination. In this paper, Bi4Ti3O12 nanosheets with different concentrations of surface oxygen vacancies (VO) and Ti3+ defect were prepared by the molten salt method and NaBH4 high-temperature reduction method (HBTO). Surface defects formed obvious carrier traps on the HBTO surface, reduced the recombination rate of photogenerated electrons and holes, and adjusted the band gap structure (from 3.09 to 2.62 eV), which improved the visible light utilization of HBTO. The decrease of photoinduced carrier recombination rate and the improvement of visible light response significantly enhanced the photocatalytic CO2 reduction activity of HBTO under visible light. The CH3OH yield with the optimized HBTO-4 (NaBH4:Bi4Ti3O12 = 1:5) was 4.90 μmol·g–1·h–1, which was about 3.5 times that of the original BTO. Meanwhile, the band gap structure, electronic density of states (DOS), and work function were calculated by the density functional theory (DFT). This study provided an effective strategy for designing and preparing perovskite photocatalysts rich in surface defects for the efficient conversion of solar energy.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Hongji Li,Dandan Wang,Chun Miao,Fengwu xia,Yubo Wang,Yutong Wang,Chunbo Liu,Guangbo Che
Photo-degradation of pollutant and photo-reduction of CO 2 are efficient ways to address challenges of water pollution , the greenhouse effect and energy crisis, respectively. In our work, via fastening two-dimensional (2D) BiOI nanoplates on 2D g-C 3 N 4 nanosheets , a BiOI/g-C 3 N 4 (BI/CN) S-scheme photocatalyst with closely stacked structure were prepared though a self-assembly process. The prepared BI/CN S-scheme heterojunction could improve the transfer and separation efficiency of photo-generated electron-hole pairs by facilitating the electrons transfer from BiOI to g-C 3 N 4 . Under visible light exposure, the photo-degradation efficiencies of tetracycline hydrochloride (TC) and p-chlorophenol (4-PC) by BI/CN-50% reached nearly 100% and 46%, respectively, which were more excellent in comparison with other samples. And BI/CN-50% sample exhibited the best CO production (12.45 μmol∙g −1 ) with visible-light irradiation of 4 h. This value was approximately 4.37 and 5.41 times higher than that of BI (2.85 μmol∙g −1 ) and CN materials (2.30 μmol∙g −1 ), respectively. Moreover, the excellent photocatalytic performance had no visible decay during five cycles. Meanwhile, an S-scheme charge transfer process was confirmed by species trapping experiments and electron spin-trap analysis. This study offers new insights into the activity, kinetics, and mechanism over BiOI-based materials for photocatalysis technology .
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Hainan Wei,Fanming Meng,Han Zhang,Wenqing Yu,Jialong Li,Sheng Yao
Constructing new photocatalysts for the photocatalytic reduction of CO 2 and efficient degradation of Levofloxacin is of great importance to renewable energy. Here, S-scheme Bi 2 MoO 6- x /MoS 2 heterojunction nanospheres containing abundant surface defects (oxygen vacancies) were designed and successfully synthesized to enhance CO 2 photoreduction activity in the absence of other sacrificial agents, co-catalysts or photosensitisers. At the same time, it can efficiently degrade organic pollutants (Levofloxacin). This heterogeneous structure with surface defects provides an abundance of reactive sites, accelerates charge separation and improves oxidation capacity. The improved Bi 2 MoO 6- x /MoS 2 heterogeneous nanospheres show excellent performance under simulated solar light, with the selectivity and yield of 92.45% and 29.01 µmol h −1 , respectively, for the generation of CO. Under visible light, the degradation efficiency of levofloxacin hydrochloride (LVX) reached 96.3% within 25 min and remained as high as 95% after three cycles. This work provides a new idea for the design of new S-scheme photocatalysts and an important reference for the preparation of photocatalysts for the efficient photocatalytic reduction of CO 2 and the efficient degradation of organic pollutants at the same time.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Journal of Cleaner Production
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2019
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IF 6.395
Xiaoqing Yue,Qiang Li,Bin Li,Long Zhao,Yu Wu,Tingyu Yang,Kai Liu,Jianbin Zhang,Ning Zhu
In the past two decades, a large number of organic sulfur compounds such as CS 2 have been released into the atmosphere, which has caused some impacts on the environment. At present, most of the industrial treatment methods of CS 2 have a series of problems, such as high energy consumption, the use of catalysts and additional treatment of by-products, which are not advisable from the economic point of view. Therefore, in this work, a method of efficient and rapid storage of CS 2 by EDAs + EGs ionic liquid systems at room temperature and pressure without catalyst were proposed. At the same time, the change trend of temperature and conductivity of EDAs + EGs systems during CS 2 storage were determined. Secondly, in order to realize the resource utilization of CS 2 SM, the mechanism of EDAs + EGs system storage CS 2 and the properties of CS 2 SM were further studied by NMR, FTIR, XPS , XRD and other modern spectral techniques. The results showed that white precipitate with high melting point (127–224 °C) and high thermal stability were formed after CS 2 is stored in the systems. These white precipitates had a similar chemical structure ([ + H 3 NR 1 NH 3 + − SC(=S)OR 2 (R 3 )O(S = )CS − ] n ), which were named as carbon disulfide storage material (CS 2 SM). Furthermore, CS 2 SMs were used as raw materials to one-step synthesize nano-metal sulfides (MSs) with excellent photocatalytic activity in the reduction of CO 2 . This provides a new method for the rapid storage and utilization of CS 2 , and it also has important practical significance for reducing CS 2 emissions and realizing effective utilization of CS 2 . This efficient, green and universally applicable CS 2 capture method is of great significance to reduce its hazards and obtain valuable chemicals.
研究领域:
环境科学
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材料科学
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化学工程
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催化
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可持续化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）