RSC Advances
·
2024
·Vol. 14
·期 8
·5142-5148
·
IF 3.9
Chunhong Jin,Jingchao Liu,Yilin Yin,Zenghe Li
In wastewater containing heavy metals, Cr(VI) is a potentially toxic metal, mainly derived from production and processing processes such as textile printing, dyeing, ore mining, battery applications, metal cleaning and electroplating. WO3 is widely used in photocatalytic degradation and reduction, and its utilization rate of visible light is high. However, the rapid recombination of photogenerated electron–hole pairs of WO3 limits its use. In this work, the composite material (WxMy) of WO3 and MIL-125 (Ti) was prepared by the ball milling method, and the catalyst was used to photocatalytically reduce Cr(VI). After using W90M10 as a photocatalyst for 50 min, the reduction rate of Cr(VI) can reach 99.2%, and the reduction rate is 2.3 times that of WO3. After 5 cycles of use, the reduction rate can still reach 91.3%. It is mainly due to the formation of a II-type heterojunction between WO3 and MIL-125 (Ti), which promotes the separation of photogenerated electron–hole pairs, thus improving the efficiency of photocatalytic reduction of Cr(VI).
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Shihai Cao,Haocheng Yang,Cheng Cheng,Jinheng Dai,Shuaishuai Lu,Yao Lu
Photocatalytic technology has been proven to be a simple and effective method for degrading recalcitrant organic pollutants. In this study, a series of Z-scheme heterojunction nanocomposites composed of CeO 2 and terephthalic acid-modified WO 3 was prepared and further used as photocatalysts for perfluorobutane sulfonate (PFBS) degradation. In this design, terephthalic acid was used as an electron recombination center and heterojunction mediator, which effectively enhances the migration ability of electron–hole pairs and the physicochemical stability of the catalyst. In addition, in situ synthesis of CeO 2 onto the WO 3 surface by the coordinate bond between terephthalic acid and Ce ions can avoid CeO 2 agglomeration. As a result, the CeO 2 @WO 3 photocatalyst exhibits excellent PFBS degradation ability (94% for CeO 2 @WO 3 vs. 19% for CeO 2 ). After the fifth cyclic degradation experiment, the CeO 2 @WO 3 photocatalyst still maintains stable degradation efficiency. Furthermore, the reaction mechanism of the PFBS in CeO 2 @WO 3 photocatalytic process was analyzed by free radical trapping experiment and liquid chromatography tandem mass spectrometry (LC-MS) technique. This study provides new insights for constructing Z-scheme heterojunction and demonstrates that CeO 2 @WO 3 photocatalysts possess a promising prospect for degrading PFBS pollutants.
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
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Xueying Wang,Qian Ma,Yi Wang,Lingyu Li,Dongheng Zhao,Huayushuo Zhang,Bolong Li
Bimetallic MOFs-derived hierarchical WO 3 /ZnWO 4 /CoWO 4 heterostructures were prepared by electrospinning for achieving superior n-butanol-sensing property at low operating temperatures. Porous chain-like structures can gradually transformed into porous mulberry-like structures composed of various accumulated particles as increasing the additive amount of Zn/Co-ZIFs. High selectivity and stability of WO 3 -based composites to 100 ppm n-butanol can be observed at 25 °C, including the large sensitivity of 32 and the fast response/recovery times of 115/179 s. The enhanced gas-sensing performance is primarily ascribed to the increased specific surface area, plentiful polyoxometalate, and effective heterojunctions, obviously promoting surface/interface absorption behavior and electron transport process.
研究领域:
材料科学
·
传感器技术
·
纳米技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 36
·期 1
·113-124
·
IF 1
Xiao He,Gao Jian-ru,Zhao Man,Cheng Xiao-ru,Xue Shou-feng,Wang Xiao-xia,Chen Wen-wen,Jia Jian-feng,Wu Hai-shun
Integration of non-noble transition metal oxides with graphene is known to construct high-activity electrocatalysts for oxygen evolution reduction (OER). In order to avoid the complexity of traditional synthesis process, a facile electrochemical method is elaborately designed to engineer efficient WO 3- x /graphene (photo-)electrocatalyst for OER by a two-electrode electrolysis system, where graphite cathode is exfoliated into graphene and tungsten wire anode evolves into VO-rich WO 3- x profiting from formed reductive electrolyte solution. Among as-prepared samples, WO 3- x /G-2 shows the best electrocatalytic performance for OER with an overpotential of 320 mV (without iR compensation) at 10 mA/cm 2 , superior to commercial RuO 2 (341 mV). With introduction of light illumination, the activity of WO 3- x /G-2 is greatly enhanced and its overpotential decreases to 290 mV, benefiting from additional reaction path produced by photocurrent effect and extra active sites generated by photogenerated carriers (h+). Characterization results indicate that both VO-rich WO 3- x and graphene contribute to the efficient OER performance. The activity of WO 3- x for OER is decided by the synergistic effect between VO concentration and particle size. The graphene could not only disperse WO 3- x nanoparticles, but also improve the holistic conductivity and promote electron transmission. This work supports a novel method for engineering WO 3- x /graphene composite for highly efficient (photo-)electrocatalytic performance for OER.
研究领域:
材料科学
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电化学
·
可再生能源
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11919-11937
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IF 3.553
Xie Ruyi,Fang Kuanjun,Liu Yu,Chen Weichao,Fan Jianing,Wang Xiaowen,Ren Yanfei,Song Yawei
To effectively decompose the organic dyes in wastewater, a novel all-solid state Z-scheme In 2 O 3 /WO 3 heterostructured photocatalyst was successfully prepared by loading In 2 O 3 nanoparticles onto WO 3 nano-needles through a two-step hydrothermal–solvothermal method. The phase structures, morphologies, chemical compositions, and optical adsorption properties of these photocatalysts were characterized in detail. In the Z-scheme photocatalytic system, the built-in internal electric field can accelerate the recombination of useless photo-generated holes on the VB of In 2 O 3 and electrons on the CB of WO 3 . The retaining photo-generated charge carriers on the CB of In 2 O 3 and VB of WO 3 possess strong redox ability. Therefore, the In 2 O 3 /WO 3 heterogeneous photocatalysts exhibited remarkably improved photocatalytic activity toward degradation of organic dyes and tetracycline hydrochloride compared to pure WO 3 and In 2 O 3 semiconductor materials under visible-light irradiation. The recycling experiments showed that Z-scheme In 2 O 3 /WO 3 heterogeneous photocatalyst could still degrade 86.6% of methylene blue and 86.4% of rhodamine B even after three cycles, confirming its high photo-stability. The trapping experiments demonstrated that photo-generated holes and ·O 2 − were the predominant active species for photocatalytic degradation of organic dyes. Based on the experimental results, a possible photocatalytic mechanism of Z-scheme In 2 O 3 /WO 3 heterostructure was proposed. This investigation provided a novel approach for construction of efficient heterostructured photocatalysts for wastewater purification.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
FUEL
·
2015
·
IF 3.52
Hao Wang,Zhenyu Yao,Xuchun Zhan,Yan Wu,Min Li
A microwave hydrothermal (MWH) method was used to deposit WO 3 onto ZrO 2 –Al 2 O 3 with various ZrO 2 contents to prepare hydrodesulfurization (HDS) catalysts with high WO 3 loading (23 wt%) close to industrial hydrotreating, for achieving high W dispersion and weak W-support interaction. The catalysts with the same WO 3 and ZrO 2 contents were prepared by a conventional impregnation (IM) method as reference. The effects of catalyst preparation methods and ZrO 2 contents on the catalyst property and dibenzothiophene HDS activity were investigated. The results show that the MWH method leads to highly dispersed octahedrally coordinated W species which are weakly linked on ZrO 2 –Al 2 O 3 and easy to be reduced; no bulk WO 3 crystallites are observed even at high ZrO 2 content (50 wt%). Therefore, it causes better sulfidation and shorter WS 2 slabs. Contrarily, the IM method induces W species to agglomerate into bulk WO 3 crystallites which are poorly dispersed and hard to be reduced, which is further aggravated by ZrO 2 . The HDS activity of the MWH-prepared catalysts significantly increases with ZrO 2 up to 40 wt% ZrO 2 . This catalyst shows 2 times higher rate constant and 1.64 times higher efficiency of HDS than the IM-prepared catalyst with the same ZrO 2 content. For the IM-prepared catalysts, the HDS activity slightly increases at small amount of ZrO 2 (10 wt%) and then decreases drastically.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 9
·2850-2862
·
IF 7.704
Xiaoyu Bai,Yi Li,Liangbo Xie,Xiaohui Liu,Sihui Zhan,Wenping Hu
Antibiotics accumulate because of their extensive use and difficult degradation, which can lead to the formation of novel antibiotic resistant genes and bacteria, which can cause damage to human health and the ecological environment. Here, we designed a novel photo-electro-Fenton-like (PEF-like) system with bifunctional Z-scheme WO3/g-C3N4 for accelerated decomposition and enhanced mineralization of stubborn ciprofloxacin (CIP). This PEF-like system, accompanied by visible light activation, with the optimal WO3/g-C3N4 (1 : 6) composite exhibited outstanding removal efficiency of CIP compared with a single photocatalysis system and electro-Fenton-like (EF-like) system, and the elimination rate reached 100% within 2 h under visible light irradiation. The WO3/g-C3N4 (1 : 6) composite displayed the strongest visible light absorption, the weakest recombination of electron–hole pairs, the highest photocurrent response and the lowest electrochemical impedance compared with pristine WO3 and g-C3N4. Significantly, WO3/g-C3N4 (1 : 6) played a dual role in the PEF-like system which could not only produce ˙OH, ˙O2− and h+ during photocatalysis, but could also generate ˙OH through the reactions of W5+ and photoexcited electrons of g-C3N4 for the decomposition of H2O2. It was worth noting that this bifunctional PEF-like catalyst with photoelectric synergy could replace Fe2+ in a conventional electro-Fenton reaction and the pH range was broadened while still maintaining efficient degradation efficiency in the range of 2–9. The PEF-like system maintained a high elimination rate of CIP after five consecutive runs which revealed that it possessed prominent stability and feasibility.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 18
·8604-8611
·
IF 9.931
Yuyu Bu,Jun Ren,Huawei Zhang,Dongjiang Yang,Zhuoyuan Chen,Jin-Ping Ao
Point defects, such as oxygen vacancies in semiconductors, have been widely proven to influence the separation and transfer processes of the photogenerated hot charges. Besides point defects, to date, scarcely any study has focused on expounding the functions of line defects (such as dislocations) in the crystal of semiconductor photoanodes and influencing the photogenerated hot charge separation process. Herein, a nanoflower (NF)-like WO3 single-crystal thin film photoanode with edge dislocations is reported. The dislocation induces mismatch of the (002) and (020) facets. Further photoelectrochemical (PEC) performance and DOS calculation results indicate that a heterojunction system could be formed along the edge dislocations due to the energy difference between the mismatched (002) and (020) facets. Therefore, this present study provides an understanding of the line defect in the photogenerated hot carrier separation process and a novel method to improve the properties of photoelectrodes and photocatalytic materials in the near future.
研究领域:
材料科学
·
光电化学
·
纳米材料
·
半导体物理
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Renjun Si,Hongze Jiang,Suijiang Xie,Xin Guo,Shunping Zhang
In response to the challenges posed by limited portability and high costs associated with current fractional exhaled nitric oxide (NO) detection equipment, a miniaturized metal oxide semiconductor (MOS) gas sensor has been developed for NO detection, leveraging the principles of MOS gas sensors and MEMS technology. This sensor employs 2 mol% Ta-WO 3 as its sensitive material, achieving a NO detection limit of 5 ppb, along with rapid response and recovery times of 30 seconds and 10 seconds respectively. It also exhibits exceptional selectivity and stability. During tests involving both single-component gases and mixtures containing twelve interfering gases, the response amplitude and interference rate for NO remained below 5 ppb. This indicates that the 2 mol% Ta-WO 3 sensor demonstrates commendable precision and practicality. The choice of sensitive material, along with its performance optimization methods, holds significant importance for advancing research in NO detection as well as enhancing the selectivity of MOS gas sensors.
研究领域:
材料科学
·
医学检测
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yongji Wei,Yanan Xu,Qi Zheng,Qingfeng Li,Yuchen Huang,Yuyan Cao,Nengqin Jia,Chaomin Zhang,Yang Chen
The rational construction of semiconductor heterojunctions with abundant active specific area and matched energy band alignment is vital to boosting photocurrent response in highly sensitive photoelectrochemical (PEC) sensors. Here, a molecularly imprinted PEC sensor is proposed based on a WO 3 /BiVO 4 heterojunction using CAU-17, a Bi-based metal-organic framework (MOF), as a structural control agent. Unlike the conventional embedding structure, in which WO 3 is covered by BiVO 4 or vice versa, this MOF-derived WO 3 /BiVO 4 hybrid comprises WO 3 nanoleaves and uniformly distributed BiVO 4 nanoparticles. This structure offers a comparatively large surface area, enhancing light adsorption and enhancing solid-solid and solid-liquid interfacial contact, thereby promoting photogenerated electron-hole separation, rapid charge transfer, and interfacial reaction. With the aid of molecular imprinting technology, the WO 3 /BiVO 4 -based PEC sensor is capable of quantitatively detecting amoxicillin, a frequently prescribed antibiotic in both human and veterinary medicine. This sensor exhibits broad linear range of 10 −3 –10 3 μmol L −1 , low detection limit of 2.4 × 10 −4 μmol L −1 , high specificity, reproducibility, and stability. Furthermore, it has significant practical potential for environmental pollution monitoring.
研究领域:
材料科学
·
分析化学
·
环境科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Man Zhang,Changzhu Yang,Wenhong Pu,Yuanbin Tan,Kun Yang,Jingdong Zhang
ABSTRACT The heterojunction films of WO 3 /TiO 2 were prepared by liquid phase deposition (LPD) method via two-step processes. The scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopic analysis indicated that flower-like WO 3 film was successfully deposited on TiO 2 film with the LPD processes. The TiO 2 film provided an excellent platform for WO 3 deposition while WO 3 obviously expanded the absorption of TiO 2 film to visible light. As the result, the heterojunction film of WO 3 /TiO 2 exhibited higher photocurrent response to visible light illumination than pure TiO 2 or WO 3 film. The photoelectrocatalytic (PEC) activity of WO 3 /TiO 2 film was evaluated by degrading Rhodamin B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation. The results showed that the LPD WO 3 /TiO 2 film possessed high PEC activity for efficient removal of various refractory organic pollutants.
研究领域:
材料科学
·
环境科学
·
光电催化
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Xuan-Yu Yang,Zheng-Guang Zhao,Li-Juan Yue,Ke-Feng Xie,Gui-Xin Jin,Shao-Ming Fang,Yong-Hui Zhang
Pd-based materials have received remarkable attention and exhibit excellent H2 sensing performance due to their superior hydrogen storage and catalysis behavior. However, the synergistic effects originated from the decoration of Pd on a metal oxide support to boost the sensing performance are ambiguous, and the deep investigation of metal support interaction (MSI) on the H2 sensing mechanism is still unclear. Here, the model material of Pd nanoparticle-decorated WO3 nanosheet is synthesized, and individual fine structures can be achieved by treating it at different temperatures. Notably, the Pd-WO3-300 materials display superior H2 sensing performance at a low working temperature (110 °C), with a superior sensing response (Ra/Rg = 40.63 to 10 ppm), high sensing selectivity, and anti-interference ability. DFT calculations and detailed structural investigations confirm that the moderate MSI facilitates the generation of high mobility surface O2– (ad) species and a proper ratio of surface Pd0–Pd2+ species, which can significantly boost the desorption of intermediate PdHx species at low temperatures and contribute to enhanced sensing performance. Our work illustrates the effect of MSI on sensing performance and provides insight into the design of advanced sensing materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）