CHEMICAL ENGINEERING JOURNAL
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2022
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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.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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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.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Longfei Yue,Shanfeng Wang,Guoqiang Shan,Wei Wu,Liwen Qiang,Lingyan Zhu
A novel three-dimensional (3D) mesoporous multiwalled carbon nanotubes-Bi 2 WO 6 (MWNTs–Bi 2 WO 6 ) microsphere photocatalyst with excellent photocatalytic performance was synthesized by a facile hydrothermal method and used to catalytically degrade tetracycline (TC) in water. Compared with pure Bi 2 WO 6 , the photocatalytic activity of the MWNTs–Bi 2 WO 6 composites was enhanced significantly. The incorporated MWNTs facilitated the photogenerated electron transfer and enhanced the separation of photogenerated hole and electron pairs. In addition, the composite displayed stronger light absorption in the visible light region. Furthermore, the large surface as well as π – π electron coupling with the contaminants of MWNTs promoted the adsorption of TC on the photocatalyst surface. As a result, the incorporation of MWNTs with Bi 2 WO 6 enhanced photocatalytic activity. The best photocatalytic performance was achieved with MWNTs proportion of 3%. Almost 100% of TC (20 mg/L) was removed by the solids of 3% MWNTs–Bi 2 WO 6 (0.5 g/L) after irradiation with simulated solar light for 60 min and the degradation efficiency increased about 35% compared with the bare Bi 2 WO 6 . The degradation of the adsorbed TC on the catalyst was also investigated. The FT-IR and DTG analyses demonstrated that the adsorbed TC was slightly degraded in 1 h irradiation although the free TC in solution was completely degraded. As the irradiation extended for 3 h, the adsorbed TC was also degraded. The results indicated that the prepared MWNTs–Bi 2 WO 6 composite has great potential for treatment of organic pollutants in water.
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
CHINESE JOURNAL OF CATALYSIS
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2019
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IF 4.914
Li Guo,Kailai Zhang,Xuanxuan Han,Qiang Zhao,Yuanyuan Zhang,Mian Qi,Danjun Wang,Feng Fu
In this work, a set of novel Cu 2 ZnSnS 4 /Bi 2 WO 6 (CZTS/BWO) two-dimensional (2D)/two-dimensional (2D) type-II heterojunctions with different CZTS weight ratios (1%, 2%, and 5%) were successfully synthesized via a brief secondary solvothermal process. The successful formation of the heterojunctions was affirmed by characterization methods such as X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. The photocatalytic activity results showed that the prepared CZTS/BWO heterojunctions had excellent photocatalytic behaviors for organic degradation, especially when the mass fraction of CZTS with respect to BWO in the composite was 2%. Moreover, the addition of hydrogen peroxide (H 2 O 2 ) could further improve the dye and antibiotic degradation efficiencies. The reinforced photocatalytic and photo-Fenton degradation performance were primarily attributable to the introduction of BWO, which afforded increased active sites, expanded the solar spectral response range, and accelerated the cycle of Cu(II)/Cu(I); after four cycling times, its catalytic activity did not decrease significantly. In addition, reasonable hypotheses of the photocatalytic and photo-Fenton catalytic mechanisms were formulated. This study is expected to provide a visual approach for designing a novel photo-Fenton catalyst to jointly utilize the photocatalytic and Fenton activities, which can be better applied to the purification of residual organics in wastewater.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
NANO
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2017
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IF 1.025
Yunyun Wang,Jixiang Wang,Hongqiang Shen,Pengwei Huo,Chunmei Li,Yongsheng Yan,Weidong Shi
The photocatalytic technology as a kind of green and potential technology has been paid more and more attention in ever-increasing environmental pollution and energy shortage. In this study, a practical strategy is proposed to facilitate effectively the separation of photogenerated electrons and holes by addition of graphene oxide in Ag 3 PO 4 and Bi 2 WO 6 nanocrystals semiconductor composites. Compared with GO-single component, the three-component RGO-Ag 3 PO 4 /Bi 2 WO 6 composites exhibited improved photocatalytic activity with a degradation rate that reached up to 91% for tetracycline (TC) by visible light irradiation. Graphene oxide served as an electronic conduction medium to effectively transfer the photogenerated electrons from the conduction band of Bi 2 WO 6 to the valence band of Ag 3 PO 4 ; the all-solid-state Z-Scheme photocatalytic mechanism was proposed. Our work provides an effective method for development of pragmatic photocatalysts in the present environmental pollution, energy problems and other related fields.
研究领域:
环境科学
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材料科学
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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
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2024
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IF 13.3
Qiuyue Zheng,Tingting Wang,Xue Ma,Ruibai Ma,Chaobo Huang,Xianfa Zhang,Xiaoli Cheng,Lihua Huo,Zoltán Major,Yingming Xu
Developing reliable and portable sensors for detection of highly toxic mustard gas is extremely important for public security. However, gas sensors based on pristine metal oxide semiconductors often suffer from high working temperature, inferior response, and inadequate detection limit owing to their poor intrinsic conductivity and weak adsorption toward target gases, thereby hindering their wide application. Herein, hierarchical WO 3 -Bi 2 WO 6 heterostructures were fabricated as sensing materials to comprehensively improve their sensing properties to 2-chloroethyl ethyl sulfide (2-CEES, a mustard gas simulant). The optimized sensor based on WO 3 -Bi 2 WO 6 -2 displayed short response time of 1.4 s and high sensing response (R a /R g = 63) to 50 ppm 2-CEES at 133 °C, together with an ultra-low detection limit of 10 ppb. The improvement of WO 3 -Bi 2 WO 6 -2 in sensing properties are synergistically attributed to the amount of heterojunction and surface adsorption sites, which were proved by DFT calculations and a series of characterizations. This work might pave the way for further developing heterostructure-based sensors for 2-CEES detection with superior sensing properties.
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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产品关联
DOI
高影响因子
Carbon Letters
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2024
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IF 5.5
Liu Rui,Zhang Xin,Tan Chong
Environmental-friendly photocatalytic technology is attracting considerable attentions in the filed of antibiotic degradation. In this work, an innovative Ag/ZnO/Bi 2 WO 6 catalyst was fabricated using sol–gel and ultrasonic methods for the degradation cefuroxime sodium in wastewater. The optimized Ag/ZnO/Bi 2 WO 6 photocatalyst demonstrated the a remarkable 77.0% photocatalytic efficiency within 180 min under simulated solar sunlight, with an apparent rate constant of 0.01085 min −1 . This efficiency is notably 6.02 and 1.41 times higher than that of pure ZnO and Ag/ZnO, respectively. The Ag/ZnO/Bi 2 WO 6 photocatalyst achieved a degradation efficiency of up to 72.3% in tap water and polluted river water, while achieving 65.7% degradation in pulping wastewater and pharmaceutical wastewater. Experiments involving reactive species scavenging and electron paramagnetic resonance implied that hydroxide radicals were the predominant active species responsible for the degradation. The enhanced catalytic mechanism and degradation pathway were elucidated, providing valuable insights into the construction and development of high-performance catalysts based on zinc oxide.
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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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yanxia Shen,Haibo Zhu,Liya Deng,Liu Yang,Yajing Shen,Qiangwen Fan,Zhanggao Le,Zongbo Xie
Improving the transmission and separation efficiency of light carriers is considered an effective method to enhance the catalytic performance of semiconductor photocatalysis. Herein, we report the synthesis and application of g-C3N4/Bi2WO6 heterostructure nanosheets for the photocatalytic coupling of thiols to disulfides under visible light irradiation. The heterojunction exhibits significant photocatalytic performance compared to the bare catalyst, which dramatically enhances the separation and transfer of photogenerated charge carriers due to the remarkable hole-trapping ability of g-C3N4. Various functional symmetrical and asymmetrical disulfides have been effectively prepared by employing this heterostructure photocatalytic system, which features excellent photocatalytic activity and cycling stability. The outstanding photocatalytic activity of the semiconductor heterojunction catalyst provides an economical, sustainable, and thus green process for producing disulfides.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 20
·12068-12077
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IF 3.119
Keyi Zhou,Jianjiang Lu,Yujun Yan,Chengyu Zhang,Yijin Qiu,Wanjie Li
A series of novel BiI/Bi2WO6 nanosheets was successfully synthesized using a simple and efficient one-step hydrothermal method; the obtained specimens were subsequently characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible spectrophotometry, X-ray photoelectron spectroscopy, N2 adsorption/desorption isotherms, Raman spectroscopy, ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, photoluminescence, and electronic impedance spectroscopy testing. The results indicated that the photocatalytic performance of the BiI/Bi2WO6 composites for the degradation of tetracycline hydrochloride (TC) from aqueous media under visible light irradiation (λ > 420 nm) was higher than that of pure Bi2WO6. The 0.8I-BiI/BWO composite (where 0.8 is the I : W molar ratio) presented the best photocatalytic performance of all analyzed specimens, and was able to degrade approximately 90% of the TC in 80 min. In addition, radical-capture experiments have demonstrated that superoxide anion radicals and hydroxyl radicals were the main active species for degrading organic pollutants, and a photocatalytic mechanism for the BiI/Bi2WO6 system was proposed. This study not only provides a method for the simple preparation of BiI/Bi2WO6, but could also present important implications for ecological risk management and prevention against antibiotic pollution.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Zihan Kang,Mengshi Chen,Jiang Wu,Ni Qin,Dinghua Bao
Piezocatalytic technology with controllable generation of reactive oxygen species (ROS) is emerging in wastewater treatment. This study employed the synergetic regulation of functional surface and phase interface modification to effectively accelerate redox reaction in piezocatalytic process. We anchored the conductive polydopamine (PDA) onto Bi 2 WO 6 (BWO) using template method, in which a small amount of Bi precipitation to induce partial phase transition of BWO from tetragonal to orthorhombic (t/o) in virtue of simple calcination. ROS traceability studies have identified the synergistic relationship between charge separation and transfer. Polarization in two-phase coexistence is intimately modulated by the orthorhombic relative central cation displacement. The orthorhombic phase with large electric dipole moment significantly promotes the generation of piezoresistive effect of intrinsic tetragonal BWO and optimizes the charge distribution. PDA further overcomes the obstruction of carrier migration at the phases interface to accelerate the generation rate of free radicals. Consequently, the superior rhodamine B (RhB) piezocatalytic degradation rate of 0.10 and 0.32 min −1 were delivered by t/o-BWO and t/o-BWO@PDA, respectively. This work reveals a feasible polarization enhancement strategy for the phase coexistence, and flexibly introduces the in-situ synthesized economical polymer conductive unit into the piezocatalysts.
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
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Ning Qi,Lirong Mo,Yacen Tang,Youzhou He,Yuqing Wang,Xintong Shi,Yuyu Fang,Xingyan Liu,Siping Wei
Photocatalytic technology is widely used to solve environmental pollution problems, while most photocatalysts have a weak response to visible light, photogenerated charges are easy to recombine, and catalytic activity is limited. Herein, we used electrostatic self-assembly to tightly load Ti 3 C 2 MXene quantum dots (MQDs) onto Bi 2 WO 6 with oxygen vacancies (BWO) to obtain BWO@MQDs composite photocatalytic materials for the degradation of tetracycline (TC). The presence of oxygen vacancies in BWO provided more active sites, facilitating the reduction of O 2 to ·O 2 - by electrons. Moreover, MQDs and BWO could form a Schottky junction at the contact interface, and then the electrons on the BWO conduction band were transferred to MQDs, reducing the photogenerated electron-hole recombination. Under the optimal experimental conditions, the TC degradation efficiency of the BWO@MQDs photocatalyst was 88.12 %, which was 1.61 times that of original Bi 2 WO 6 , and the catalytic activity was well preserved after cycle stability testing. The possible photocatalytic mechanism and photodegradation pathway were revealed by UV–vis, XPS, ESR and LC-MS, the results indicated that ·O 2 - played the most dominant role in TC degradation and the final degradation products were mainly CO 2 and H 2 O. This study has important implications in oxygen vacancies and quantum dots co-modified bismuth-based materials for photocatalysis to solve water pollution problems.
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
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2020
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IF 5.647
Zhu Mengting,Tonni Agustiono Kurniawan,You Yanping,Mohd Hafiz Dzarfan Othman,Ram Avtar,Dun Fu,Goh Hui Hwang
We aim at fabricating a ternary magnetic recyclable Bi 2 WO 6 /BiOI@Fe 3 O 4 composite that could be applied for photodegradation of tetracycline (TC) from synthetic wastewater. To identify any changes with respect to the composite's morphology and crystal structure properties, ΧRD , FTIR , FESEM-EDS, PL and VSM analyses are carried out. The effects of Fe 3 O 4 loading ratio on the Bi 2 WO 6 /BiOI for TC photodegradation are evaluated, while operational parameters such as pH, reaction time, TC concentration, and photocatalyst's dose are optimized. Removal mechanisms of the TC by the composite and its photodegradation pathways are elaborated. With respect to its performance, under the same optimized conditions (1 g/L of dose; 5 mg/L of TC; pH 7; 3 h of reaction time), the Bi 2 WO 6 /BiOI@5%Fe 3 O 4 composite has the highest TC removal (97%), as compared to the Bi 2 WO 6 (63%). After being saturated, the spent photocatalyst could be magnetically separated from solution for subsequent use. In spite of three consecutive cycles with 71% of efficiency, the spent composite still has reasonable photocatalytic activities for reuse. Overall, this suggests that the composite is a promising photocatalyst for TC removal from aqueous solutions.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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