SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Pengfei Zhu,Shasha Zhang,Mei Liu,Ming Duan,Zhaoxin Huang,Han Lu
Herein, a novel Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 double Z-scheme heterojunction photocatalytic material was synthesized by the ultrasonic-assisted coprecipitation method. When the content of AgBr in Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 is 30 wt% and the content of Ag 4 V 2 O 7 is 1 wt%, under the optimized reaction conditions, the degradation rate of Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 to oxytetracycline (OTC) reached 88.13 % within 60 min, and the photocatalytic activity decreased only slightly after repeated use for three times, other than that, the toxicity of OTC to wheat decreased significantly after degradation. The morphology, composition, crystal structure and visible light absorption capacity of the samples are investigated by a series of characterization techniques. Furthermore, free radical capture experiment, electron paramagnetic resonance (EPR) experiment and liquid chromatography-mass spectrometry (LC-MS) were used to explore the possible photocatalytic mechanism and degradation path of OTC. The results show that the improvement of photocatalytic activity is attributed to the construction of a double Z-scheme heterojunction, which provides a more effective structural space for the separation of photogenerated e - -h + pairs. This study provides a new idea for the separation of photogenerated e - -h + pairs and broadens the response range of visible light, and proposes a new strategy for the environmental treatment of photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huiqin Ma,Weiyi Yang,Shuang Gao,Wanrong Geng,Yunli Lu,Chunliang Zhou,Jian Ku Shang,Tuo Shi,Qi Li
The internal polarizations of polar photocatalysts could be enhanced through unit cell structure modulations to improve their photocatalytic performances. In this work, a simple, robust and low-cost NaOH etching process is developed to treat ultrathin Bi 2 WO 6 nanosheets after their creation, resulting in a higher degree of polyhedron distortion (∼141 %) and an enhanced piezoelectricity (∼260 % the maximum effective piezoelectric coefficient d 33 ). Compared with pristine ultrathin Bi 2 WO 6 nanosheets, these etched samples demonstrate an improved charge carrier separation and transfer behavior due to their enhanced internal polarization with the assistance of richer oxygen vacancies, which largely enhance their piezocatalysis (∼4.6 times), photocatalysis (∼14.3 times) and especially coupled photopiezocatalysis (∼33.9 times) performances as demonstrated in their sulfamethoxazole (SMX) degradation performances. ·O 2 – , 1 O 2 and h + are proven to be main reactive oxygen species (ROSs) during their photopiezocatalytic process and they could also work well in the real water matrix.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jian Yang,Lei Li,Fan Fu,Hao Xu,Kang Da,Shaobo Cao,Wenting Chen,Lei Yang,Ximei Fan
As a typical aromatic volatile organic compounds (VOCs), toluene is difficult to be decomposed by photocatalysts under visible-light driven. Herein, the Ag/AgCl/Bi 2 WO 6 heterojunction photocatalysts were synthesized by multi-step process involving chemical deposition of AgCl on the surface of Bi 2 WO 6 and subsequently photoreduction of Ag 0 nanoparticles by UV light. The as-synthesized photocatalysts were characterized by XRD , SEM, TEM, XPS , UV–vis, PL and ESR to investigate the microstructures and electronic structures. The corresponding degradation efficiencies of gaseous toluene were evaluated and the optimal Ag/AgCl/Bi 2 WO 6 exhibited almost 99.9% removal rate after 60 min illumination with visible light (>420 nm). The optical absorption properties and radical trapping experiments revealed the possible energy band structure of Ag/AgCl/Bi 2 WO 6 heterojunction. Finally, the possible enhancement mechanism was also proposed that the cooperation of surface plasmon resonance (SPR) effect, efficient separation of electron-hole pairs, extension of the carrier lifetime as well as the high redox potentials of Z -scheme heterojunction were the primary reasons. Therefore, construction of Z-scheme heterojunction of Ag/AgCl/Bi 2 WO 6 with higher redox ability is an effective way to degradation gaseous toluene under visible-light irradiation.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Wei Zhang,Jie Zhao,Ahmed A. Allam,Yue Xin,Jingqi Lin,Ting Gao,Jamaan S. Ajarem,Ximing Li,Chuanyi Wang,Detlef W. Bahnemann
Bi2WO6 is a promising photocatalyst for NOx removal, owing to its wide solar light absorption and specific photoelectric properties. Nevertheless, enhancing its efficiency remains a major concern. Palladium proves to be a good co-catalyst for semiconductor materials, but how the combination of Pd and bismuth tungstate affects the efficiency of NO removal and relevant process is still vague. In this work, nutshell-like bismuth tungstate was synthesized using a hydrothermal method, followed by photo-depositing Pd nanoparticles with different contents. The obtained photocatalysts were characterized by X-ray diffraction, specific surface area analyzer (BET), X-ray photoelectron spectroscopy, and scanning electron microscopy. Among the prepared photocatalysts, Bi2WO6 deposited with 1 wt % Pd shows the best photocatalytic activity with a NO removal efficiency of 58%, which is 2.9 times that of the Bi2WO6 under the same conditions. The enhanced photocatalytic activities were attributed to the comprehensive effects of the high efficiency in separating electrons and holes, improvement in invisible light utilization and BET specific surface areas of Pd–Bi2WO6 nanocomposites. More importantly, it was found that NO2 is the main product over Bi2WO6, whereas the conversion of NO to NO3– (an environmentally friendly product) is dominant over Pd-modified Bi2WO6 due to the enhanced separation of electrons and holes. Active species capture experiments show that photo-generated holes (h+) and •O2– play an important role in NO removal. The present work provides new insights into the role of Pd cocatalysts in NO removal.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lijun Wu,Song Zheng,Heng Lin,Shun Zhou,Ahmed Mahmoud Idris,Jin Wang,Sheng Li,Zhengquan Li
All-inorganic lead-free halide double perovskites have emerged as rising star photocatalysts to substitute the toxic lead-based hailed perovskites (LHPs) owing to their unique photophysical properties. Nevertheless, their photocatalytic activities toward CO 2 reduction are still far from comparable with the LHPs, associated with severe charge recombination and sluggish surface catalytic reaction . Herein, a delicate 0D/2D heterojunction of Cs 2 AgBiBr 6 /Bi 2 WO 6 (CABB/BWO) was assembled by in-situ growing cubic CABB nanocrystals on the flat surface of BWO nanosheets via a facile hot-injection method. Density functional theory (DFT) calculations disclose that the work function and Fermi level difference between CABB and BWO give rise to charge redistribution at the interface upon the formation of the heterojunction, creating an internal electric field (IEF). Upon light irradiation , the IEF enables the photogenerated electron transfer from BWO to CABB via direct Z-scheme electron transfer mode with striking spatial charge separation as verified by in-situ X-ray photoelectron (XPS) and electron spin resonance (ESR) spectra. Consequently, the CABB/BWO heterojunction realizes 7-fold higher photocatalytic activity than pristine CABB with significant electron consumption rate of 87.66 µmol g -1 h −1 under simulated solar light (AM 1.5G).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhongli Liu,Haizeng Wang,Jizhou Duan,Baorong Hou
Bi 2 WO 6 /AgIO 3 (BWO/AIO) nanosheet composites were constructed by a two-step hydrothermal method . The structure, morphology and photoelectrochemical properties of the composites were characterized by X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (UV-DRS), transmission electron microscopy (TEM), impedance, X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The constructed photocatalyst composites exhibited the best photocatalytic performance at a molar ratio of BWO/AIO-0.8. In addition, there was complete degradation of RhB by the BWO/AIO-0.8 in 180 min under illumination, and the bactericidal rates were 99.10%, 97.32% and 96.3% for P. aeruginosa , S. aureus and E. coli, respectively, in 60 min. Based on the energy band structure of the semiconductor and radical trapping experiments, the S-scheme heterojunction was associated with the enhanced photocatalytic properties.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Fuyou Du,Zhan Lai,Huiyang Tang,Haiyan Wang,Chenxi Zhao
In this work, a novel dual Z-scheme Bi 2 WO 6 /g-C 3 N 4 /black phosphorus quantum dots (Bi 2 WO 6 /g-C 3 N 4 /BPQDs) composites were fabricated and utilized towards photocatalytic degradation of bisphenol A (BPA) under visible-light irradiation. Optimizing the content of g-C 3 N 4 and BPQDs in Bi 2 WO 6 /g-C 3 N 4 /BPQDs composites to a suitable mass ratio can enhance the visible-light harvesting capacity and increase the charge separation efficiency and the transfer rate of excited-state electrons and holes, resulting in much higher photocatalytic activity for BPA degradation (95.6%, at 20 mg/L in 120 min) than that of Bi 2 WO 6 (63.7%), g-C 3 N 4 (25.0%), BPQDs (8.5%), and Bi 2 WO 6 /g-C 3 N 4 (79.6%), respectively. Radical trapping experiments indicated that photogenerated holes (h + ) and superoxide radicals (•O 2 − ) played crucial roles in photocatalytic BPA degradation. Further, the possible degradation pathway and photocatalytic mechanism was proposed by analyzing the BPA intermediates. This work also demonstrated that the Bi 2 WO 6 /g-C 3 N 4 /BPQDs as effective photocatalysts was stable and have promising potential to remove environmental contaminants from real water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·469
·
IF 3.9
Hongzhong Zhang,Zhaoya Fan,Qingqing Chai,Jun Li
In this work, a Z-scheme Bi2WO6/BiO2−xheterojunction was successfully prepared using a self-assembly strategy. Various characterization techniques demonstrated that the formation of the heterojunction not only accelerated the separation of photoinduced carriers but also weakened the recombination rate of photogenerated electron–hole pairs-. The Bi2WO6/BiO2−xcomposites had a wider absorption edge than Bi2WO6in the range of 200–800 nm, which improved the photocatalytic performance of ciprofloxacin (CIP) degradation under xenon lamps. As a result, the Z-scheme heterojunction Bi2WO6/BiO2−xcomposite exhibited excellent photocatalytic activity. Catalyzed by the optimal 20% Bi2WO6/BiO2−x(0.5 g/L), the removal rate of CIP (10.0 mg/L) was 91.8% within 2 h irradiated by visible light, which was 2.37 times that of the BiO2−xcatalyst. This work will provide a fresh perspective on the construction of visible-driven Z-scheme photocatalysts for wastewater treatment.Keywords:photocatalysis;ciprofloxacin;Bi2WO6;BiO2−x;Z-scheme heterostructure
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Ma Yong-hu,Ma Fu,Zhao Tiao-bin,Gao Zi-yi,La Ying-hong,Zhao Hong-jian
Limited interfacial charge separation efficiency and insufficient redox capacity severely hinder the practical application of conventional Bi 2 WO 6 -based photocatalysts. To address these issues, a novel Bi(C 2 O 4 )OH/Bi 2 WO 6 heterojunction was constructed via a facile room-temperature one-pot liquid-phase deposition method. Multiple characterizations confirm the intimate interfacial contact between Bi(C 2 O 4 )OH nanorods and uniformly anchored Bi 2 WO 6 nanoparticles, accompanied by the introduction of abundant oxygen vacancies. On the basis of radical trapping experiments, EPR measurements, and electrochemical tests, an S-scheme charge-transfer model is proposed. This model retains the strong redox potentials of both semiconductors, while oxygen vacancies are speculated to act as efficient interfacial charge-trapping and transfer sites to synergistically promote the migration and separation of photogenerated carriers. The optimized 7%Bi(C 2 O 4 )OH/Bi 2 WO 6 composite achieves an RhB removal efficiency of 97.6% within 60 min for 50 mL of RhB solution (30 mg·L -1 ) under 5-W LED lamp irradiation. Radical trapping and EPR tests confirm that ·O 2 - , h⁺, and ·OH are the dominant active species. This work presents a facile and efficient room-temperature fabrication strategy for Bi-based heterojunctions and systematically elucidates the synergistic promotion mechanism between oxygen vacancies and the proposed S-scheme charge-transfer pathway, offering new insights for designing high-performance photocatalysts for organic wastewater remediation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2021
·
IF 2.348
Wenna Hu,Fan Wu,Wei Liu
In this paper, nitrobenzene was found to be efficiently degraded by the as-prepared Z-scheme Bi 2 O 3 /Bi 2 WO 6 photocatalyst under visible light . The Bi 2 WO 6 and the composites were fabricated individually by solid phase synthesis and water-assisted grinding method. The crystal structure, morphologies, interface, optical property and Brunauer-Emmett-Teller (BET) surface area of samples were examined by different characterization techniques. The tests on photodegradation of nitrobenzene stated clearly the as-prepared composite exhibited evidently enhanced photocatalytic performace compared with uniphase material. Additionally, the optimal Bi 2 O 3 content in the coupled photocatalysts was 2%. The supreme rate constant of nitrobenzene degradation was almost 3.1 and 2.7 times that of single Bi 2 O 3 and Bi 2 WO 6 , respectively. The obviously increased photocatalytic performance of the composite was due to the highly effective separation of photoexcited electron-hole pairs over the Z-scheme structure formed between Bi 2 O 3 and Bi 2 WO 6 . The investigation provides great potential applications in treatment of the toxic and refractory wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yanyan Zhao,Xuhua Liang,Xiaoyun Hu,Jun Fan
Fabrication of binary composite has proved to be an efficient approach to improve the photocatalytic activity of monomer photocatalyst . In this contribution, an effective Reduced Graphene Oxide/Bismuth Tungsten Oxide (rGO/Bi 2 WO 6 ) composite with outstanding photocatalytic activity was designed by employing Bi 2 WO 6 as a primary photocatalyst and rGO as an electron acceptor and transporter for norfloxacin degradation in aquatic environment. The rGO/Bi 2 WO 6 composite displayed higher photocatalytic activity compare with pure Bi 2 WO 6 , which could degrade about 87.49% of norfloxacin with 180 min under visible light irradiation. The results of the UV–vis diffuse reflection spectrum, photoluminescence spectra and transient photocurrent response implied that the enhanced photocatalytic activity of the rGO/Bi 2 WO 6 composite could be attributed to the improved visible light-harvesting ability and the efficient charge separation ability. Additionally, the reactive-species-trapping experiments indicated that ⋅OH and e − played dominant roles during the photocatalytic degradation process. Four possible intermediates and two possible transformation pathways of norfloxacin degradation were detected by LC-MS. This present work provided a low-cost and facile green method to design of Bi-based composite.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Gaoyuan Long,Jiafeng Ding,Lihong Xie,Runze Sun,Mengxia Chen,Yanfang Zhou,Xiuying Huang,Gaorui Han,Yajun Li,Weirong Zhao
Chlorophenols (CPs) have been considered as a kind of priority environmental pollutants for their potential detrimental effects, and photocatalytic reduction dechlorination tend to be a promising approach to CPs’ removal. In this work, 2,4-dichlorophenol (2,4-DCP) was adopted as the model pollutant of CPs, and a simple mixing and heating method was employed to prepare graphitic carbon nitride and bismuth tungstate (g-C 3 N 4 /Bi 2 WO 6 ) binary photocatalysts. Under UV–vis light irradiation and anoxic atmosphere, the g-C 3 N 4 /Bi 2 WO 6 samples exhibited enhanced photocatalytic activities. The optimal dechlorination rate constant of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 (weight ratio 3:7) was 1.13 h −1 , 7.6 and 8.9 times higher than that of pristine g-C 3 N 4 and Bi 2 WO 6 respectively. The enhanced activities originated from the effective suppression of charge recombination and extended spectrum absorption range. Kinetic studies revealed that the dechlorination processes followed the pseudo-first-order model. The photocatalytic mechanism of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 was discussed in detail, and based on which, a mediator-free Z-scheme mechanism was proposed. This work extends the application range of g-C 3 N 4 /Bi 2 WO 6 photocatalyst and provides a new insight into environmental remediation.
✓ 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）