MATERIALS RESEARCH BULLETIN
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2021
·
IF 4.641
Qiao Lu,Changchang Dong,Feng Wei,Jiadong Li,Zhao Wang,Wei Mu,Xiaojun Han
Photocatalysis shows great potential in pollution degradation without environmental harm. Herein, TiO 2 nanotube arrays (TNTAs) were prepared on titanium mesh by an anodic oxidation method, and Bi 2 WO 6 /TiO 2 nanocomposites (BWO/TNTAs) with different Bi 2 WO 6 contents were synthesized by a hydrothermal method. The Bi 2 WO 6 nanosheets decorated on TNTAs significantly improved the photocatalytic degradation of tetracycline (TC). 0.2BWO/TNTAs exhibited the degrading rate of 92.2% within 180 min under visible light. The enhancement of photocatalytic performance was ascribed to the II-type mechanism via Bi 2 WO 6 coupled with TiO 2 , which further extended the visible light absorption range and promoted the charge separation. In addition, •OH is the main active species to dominate the degradation of TC. The possible decomposition mechanism of TC was proposed by gradual loss of hydroxyl groups and C-ring cleavage. It provides a feasible strategy to remove organic pollutants for wastewater treatment.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujun Ju,Hailong Lin,Chen Chen,Ruien Hou,Zhe Wang,Tinglong Hao,Min Xu,Yu Tang,Fengjuan Chen
Covalent organic frameworks (COFs) have attracted significant attention in photocatalytic water purification due to their structural designability and sufficiently negative conduction band edges. However, the limited oxidation capacity of single COFs and the low utilization rate of photogenerated carriers result in suboptimal catalytic activity. To address these challenges, we propose a two-level regulation strategy that involves ligand engineering and the introduction of a piezoelectric field to enhance the photocatalytic performance of COF-based photocatalysts. In this study, we combined the piezoelectric material Bi 2 WO 6 with COFs modified with different ligands to design a series of Bi 2 WO 6 /R-COFs (R=H, F, CH 3 O) heterojunctions. Modifying COFs with –OCH 3 functional group tuned the local electron distribution, thereby remarkably improving photogenerated electrons transfer rate constant. Besides, the incorporation of Bi 2 WO 6 generated a piezoelectric field under ultrasound, which provides a strong driving force for photocatalytic. Meanwhile, the construction of the heterojunctions offered multi-channel for the generation of reactive oxygen species. As a result, the photocatalytic degradation rate of Bi 2 WO 6 /CH 3 O-COFs reached 93.5 % toward sulfamethoxazole within 48 min under ultrasound-coupled light irradiation, which is nearly three times higher than Bi 2 WO 6 /H-COFs. Furthermore, Bi 2 WO 6 /CH 3 O-COFs demonstrated superior degradation performance for other pollutants, including p-chlorophenol, bisphenol A, tetracycline, and phenol, with degradation efficiencies of 99.0 %, 98.4 %, 93.5 % and 88.1 %, respectively. This work proposes a two-level modulation strategy that significantly enhances the antibiotic degradation performance of COF-based catalysts, offering a new perspective for the design of photocatalysts for environmental remediation.
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
BIOELECTROCHEMISTRY
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2025
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IF 4.5
Chunfang Wang,Yining Wang,Faqiong Zhao,Baizhao Zeng
Organic-inorganic composite photoactive materials can combine the merits of organic and inorganic components and show better performance in comparison with single-component materials. In this work, a novel photoactive material was synthesized through chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) on the surface of hydrothermally prepared Bi 2 WO 6 , followed by modification of self-polymerized dopamine (PDA). The integration of poly(3,4-ethylenedioxythiophene) (PEDOT) and Bi 2 WO 6 effectively facilitated the separation of photogenerated electron-hole pairs, thus demonstrated substantially strong photoelectrochemical signal compared to pure Bi 2 WO 6 . The PDA film, with abundant functional groups, could further sensitize the material and facilitate the immobilization of recognition units. As a proof of application, the composite was combined with carcinoembryonic antibody to construct an immunosensor for carcinoembryonic antigen sensing. Resultantly, although the components and construction procedure were simple, the prepared sensor demonstrated a broad linear detection range of 0.001–20 ng/mL and a relative low detection limit of 0.50 pg/mL. It also showed high selectivity and stability. Its practical feasibility was confirmed by detecting real samples and yielding satisfactory results.
研究领域:
生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
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2020
·Vol. 4
·期 7
·2096-2102
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IF 6.788
Aize Hao,Xueer Ning,Yali Cao,Jing Xie,Dianzeng Jia
A novel piezocatalyst, Bi2WO6 nanosheets (BWO NS), has been successfully synthesized by a simple, green and harmless solid-state chemistry method. The BWO NS present excellent piezocatalytic activity in contrast with other piezocatalysts towards methylene blue organic pollutant degradation under ultrasonic vibration. The piezocatalytic efficiency of BWO NS reaches ∼96% after 35 min and they exhibit good recycling performance, suggesting great potential for wastewater dye decolorization treatment. Superoxide radicals (˙O2−) and hydroxyl radicals (˙OH) are the main active species during the piezocatalytic process, based on ESR measurements and fluorescence spectra. The induced generation of polarized electric charges in the piezocatalytic process has also been demonstrated. The piezocatalytic mechanism has been further revealed, indicating that the excellent piezocatalytic activity could be attributed to the piezoelectric effect inducing electric charges to accelerate carrier transport during chemical redox reactions. Our work could offer new guidance for designing novel piezocatalysts and shed light on the relationships between piezocatalytic properties and mechanisms for application in pollutant degradation and energy conversion.
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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DOI
高影响因子
ACS Applied Energy Materials
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2020
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IF 4.473
Zhongkai Xie,Yuyan Xu,Di Li,Suci Meng,Min Chen,Deli Jiang
The highly efficient spatial carrier separation and abundant active sites are significant for CO2 photocatalytic reduction efficiency. Herein, an ultrathin Bi2O3 nanosheet/Bi2WO6 network heterostructure is successfully synthesized via a covalently bonded epitaxial growth strategy. Due to cosharing of the Bi–O tetrahedron between Bi2O3 and Bi2WO6, this heterostructure exhibits a compact interface, which can provide a highway for the charge transfer and then boost their separation. Moreover, the pores generated from the hierarchical structure afford abundant exposed photocatalytic active sites. Thus, the optimal Bi2O3/Bi2WO6 heterostructure (BOBWO-12) shows superior photocatalytic performance for CO2 reduction with an ultrahigh selectivity as well as the removal of RhB. Notably, the photocatalytic CO generation rate over BOBWO-12 reaches up to 17.39 μmol·g–1·h–1, which is 18.0 and 4.2 times higher than that of bulk-Bi2WO6 and Bi2WO6 nanosheets, respectively, and the selectivity is of about 95.4%. Moreover, the Bi2O3/Bi2WO6 heterostructure also exhibits improved long-term stability, resulting from the firm heterointerface. Our studies present a conventient avenue to construct a high-efficiency heterostructure photocatalyst with a firm interface by the covalently bonded epitaxial growth method for CO2 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
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jiadong Li,Feng Wei,Ziyuan Xiu,Xiaojun Han
InVO 4 possesses great potential in photocatalytic CO 2 conversion. It is still highly desired to develop efficient strategies of photocatalyst fabrication to prevent its attenuated activity caused by the rapid recombination of photogenerated electron-hole. Herein, a direct Z-scheme heterojunction of Bi 2 WO 6 /InVO 4 nanosheets is constructed via two-step hydrothermal synthesis. The Bi 2 WO 6 /InVO 4 composite exhibits a superior photocatalytic performance toward CO 2 reduction into CO and CH 4 under visible light irradiation. The CO evolution rate reaches up to 17.97 μmol g −1 h −1 , while the CH 4 production rate is 1.13 μmol g −1 h −1 , which are higher than those catalyzed by bare InVO 4 and bare Bi 2 WO 6 . Based on the photoelectrochemical results, hydroxyl radical test, Scanning Kelvin Probe (SKP) and electron spin resonance (ESR) investigation, the enhanced activity of CO 2 reduction can be attributed to a Z-scheme electron transfer at the interface to promote spatial charge separation, which effectively preserves the reduction ability of photoelectron on the conduction band of InVO 4 for CO 2 conversion.
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
ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Xinyu Li,Hui Zhang,Xuedong Du,Shuaijie Wang,Qingrui Zhang,Houfen Li,Fei Ye
Constructing heterostructures has been a simple yet effective strategy for improving the photocatalytic performance of individual semiconductor photocatalysts. However, the poor quality of the contacted interface coupled with the narrow and overlapping light absorption scope between heterocomponents limits potential improvement. Herein, a 2D/2D rGO-Bi 2 WO 6 heterostructure with face-to-face compact contact interface and UV to NIR light absorption ability was synthesized to overcome the aforementioned limitations. The as-prepared 2 wt%-rGO-Bi 2 WO 6 with a high contact interface quality exhibits the highest kinetic rate of (5.53 ± 0.75) × 10 −2 L mg −1 min −1 toward tetracycline (TC) degradation, which is 2.4 times higher than that of pristine Bi 2 WO 6 and 2.1 times higher than that of the 2 wt%-rGO-Bi 2 WO 6 composite with a poor interface quality. Moreover, approximately 30% of TC can be mineralized with a 2 wt%-rGO-Bi 2 WO 6 presented system after 120 min. The subsequent Escherichia coli culture and liquid chromatography–mass spectrometry were employed to detect the biotoxicity variation of degradation intermediates and the possible transformation pathways of TC, respectively. Finally, the reactive species trapping results indicate that photogenerated holes and superoxide radical anions play dominant roles during the TC degradation process. This work provides a facile and effective method to fabricate an efficient heterojunction photocatalyst for pollutant degradation .
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
Nanoscale
·
2023
·Vol. 16
·期 6
·3024-3033
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IF 6.7
Ruowen Zhao,Yupu Zhang,Fangli Wu,Jianyuan Wang,Fang Chen,Wei Zhai
Integration of oxygen vacancies (Vo) into nanostructured semiconductor-based photocatalysts has been recognized as a promising strategy for enhancing the performance of photoelectrochemical (PEC) water splitting. However, precisely controlling the Vo concentration in photocatalysts via an effective and tunable approach remains challenging. Herein, a series of optimized bismuth tungstate (Bi2WO6) nanosheet-based photoanodes with varying concentrations of Vo were prepared by a sonochemical method with in situ cavitation detection, which enables accurate manipulation of the acoustic cavitation intensity applied to the surface of Bi2WO6 photoanodes in alkaline solution. Based on the analysis of the Vo concentration and sound field characteristics, the mechanism of sonochemical regulation of Vo in Bi2WO6 nanosheets was interpreted. Specifically, the increase in Vo concentration can be attributed to the enhancement of Bi–O bond dissociation. This enhancement is influenced not only by the intensified impact of shear force and the generation of active radicals by transient cavitation, but also by the accelerated diffusion of the reactant, a result of stable cavitation. By optimizing the transient and stable cavitation intensity, a Vo-rich Bi2WO6 photoanode was obtained without altering the microstructure of Bi2WO6 nanosheets. The presence of high concentration Vo facilitates the interfacial chemical reactivity and the transmission of photogenerated carriers, leading to the drastic promotion of the PEC water splitting performance. The transient photocurrent density of the Vo-rich Bi2WO6 photoanode reaches 69.2 μA cm−2 (1.23 V vs. RHE), 7.86 times that of the untreated Bi2WO6 photoanode. Additionally, the charge injection efficiency increases to 35.4%. This work provides a controllable and effective method for defect engineering of nanostructured semiconductor-based electrodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 22
·7002
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IF 3.623
Jiayi Chen,Kuang Wang,Jialong Tian,Wenhui Yu,Yujie Chen,Na Li,Zhenming Qi,Chunxia Wang
In this work, a visible-light-driven BiOCl/Bi2WO6photocatalyst was obtained via a facile hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), ultraviolet/visible light diffuse reflection spectroscopy (UV/Vis), and photocurrent (PC). BiOCl/Bi2WO6was modified with (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride to obtain the cationized BiOCl/Bi2WO6. Cotton fabric was pretreated with sodium hydroxide (NaOH) and sodium chloroacetate solution to obtain carboxymethylated cotton fabric, which was further reacted with cationized BiOCl/Bi2WO6to achieve finished cotton fabric. The cotton fabrics were characterized by Fourier-transform infrared spectroscopy (FT-IR), XRD, SEM, and EDS. The photocatalytic activity of the BiOCl/Bi2WO6photocatalyst and cotton fabrics was assessed by photocatalytic degradation of MB (methylene blue) solution under simulated visible light. The self-cleaning property of cotton fabrics was evaluated by removing MB solution and red-wine stains. Results revealed that the coated cotton fabrics exhibited appreciable photocatalytic and self-cleaning performance. In addition, anti-UV studies showed that the finished cotton fabrics had remarkable UV blocking properties in the UVA and UVB regions. Therefore, the finished cotton fabric with BiOCl/Bi2WO6can provide a framework for the development of multifunctional textiles.Keywords:BiOCl/Bi2WO6;cotton fabric;UV shielding;photocatalysis;self-cleaning
研究领域:
材料科学
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纺织工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Dong Ma,Juan Wu,Mengchun Gao,Yanjun Xin,Tianjin Ma,Yuying Sun
An efficient visible-light-driven Z-scheme g -C 3 N 4 /RGO/Bi 2 WO 6 composite was fabricated by the hydrothermal method. The prepared g -C 3 N 4 /RGO/Bi 2 WO 6 composite were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), nitrogen sorption, Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrometer (XPS). The photocatalytic activity of the g -C 3 N 4 /RGO/Bi 2 WO 6 composite was evaluated by the degradation of 2,4,6-trichlorophenol (TCP) under visible-light irradiation. The photochemical test and scavenging experiment showed the photogenerated electrons (e − ) and holes (h + ) had strong reducing capability and oxidation capability, respectively. The photocatalytic activity of the g -C 3 N 4 /RGO/Bi 2 WO 6 composite was higher than that of the pure g -C 3 N 4 , Bi 2 WO 6 , and g -C 3 N 4 /Bi 2 WO 6 during the TCP degradation, which could be due to the efficient visible-light utilization efficiency and the construction of Z-scheme. RGO served as a charge transmission bridge between the g -C 3 N 4 and the Bi 2 WO 6 , and the Z-scheme kept the electrons with high reducing capability in the conduction band (CB) of g -C 3 N 4 and the holes with high oxidation capability in the valence band (VB) of Bi 2 WO 6 . The photogenerated holes of Bi 2 WO 6 were the major active species in the TCP oxidative degradation, and the photogenerated electrons of g -C 3 N 4 were the major active species in the TCP dechlorination.
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 ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Tongqi Yan,Zhao Du,Jingjing Wang,Huayi Cai,Dandan Bi,Zhonglu Guo,Zhenya Liu,Chengchun Tang,Yi Fang
Bi 2 WO 6 /BN heterojunction photocatalyst with high catalytic activity has been successfully constructed by the solvothermal synthesis . It is worth noting that the formation of superoxide radicals (·O 2 - ) and hydroxyl free radicals (·OH) benefit from the formation of heterojunctions, which effectively degrade pollutants. The photocatalytic activities of the optimal sample for tetracycline (TC) and ofloxacin (OFL) degradation efficiency reached almost 99.1% and 94.66% under visible-light irradiation, respectively. It is mainly because the addition of BN not only provided more active sites for the catalyst but also improved the separation efficiency of electron-hole pairs. It can be found that h + and·O 2 - played a major role in the degradation process through the active species quenching experiment. Furthermore, the possible photocatalytic degradation pathways of TC were revealed by analyzing intermediates and a reasonable photocatalytic mechanism was proposed. Moreover, Bi 2 WO 6 /BN heterojunctions were endowed with excellent recycling and stability. Therefore, this research illustrated that two dimensions/two dimensions (2D/2D) Bi 2 WO 6 /BN heterojunction may hold a great prospect for the degradation of antibiotics in wastewater.
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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产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 12
·859
·
IF 3.8
Lingji Zhang,Mengke Shi,Shuo Zhang,Feng Yue,Cairong Yang,Yang Meng,Wen Li,Cong Li,Mario Berrettoni,Silvia Zamponi,Yongpeng Ma,Hongzhong Zhang
In response to growing concerns about the greenhouse effect, the direct conversion of atmospheric CO2has become a pivotal research focus. This research utilizes hydrothermal synthesis to develop Bi2WO6/MXene(Ti3C2Tx), which efficiently reduces CO2directly at the gas–solid interface through photothermal synergy, without requiring additional sacrificial agents or alkaline absorption solutions. The results indicate that the CO formation rate is about 216.9 μmol·g−1h−1. Notably, this system demonstrates exceptional selectivity for reducing CO2to CO. The outstanding photothermal catalytic efficiency is attributed to the introduction of MXene, which serves as an efficient and economical co-catalyst. The integration of MXene improves the composite material’s specific surface area and pore structure, enhances its CO2adsorption capacity, and results in the Bi2WO6/MXene hybrid having a shorter charge transfer distance and a larger interface contact area. This ensures superior charge transfer capabilities, ultimately leading to a significant enhancement in the catalytic efficiency of the composite. This study presents a straightforward and highly selective method for capturing and converting atmospheric CO2, offering fresh insights for developing efficient photothermal catalytic materials.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）