APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Zhongwei Zou,Haiming Xu,Dongya Li,Jingyu Sun,Dongsheng Xia
The 2D BiOCl nanosheets with excellent photocatalytic activity were synthesized via the facile hydrothermal method by regulating the pH value of the precursor solution and using dulcitol (C 6 H 14 O 6 ) as the surfactant. The photocatalysts were characterized by XRD, FT-IR, SEM, TEM, BET, XPS, ESR, O 2 -TPD, EIS, DRS and PL. The results of morphological and structural characterization indicate that the pH has a large effect on the thickness of the nanosheets and the exposure ratio of {0 0 1} facets. The photocatalytic property of the sample prepared at pH 4 showed excellent visible-light photocatalytic performance to degrade RhB owing to the small thickness, the exposed {0 0 1} facets and the optimum concentration of oxygen vacancy. Moreover, the reasonable photocatalytic mechanism was revealed by the active species trapping experiments and ESR characterization, which suggested O 2 − and h + are the main active species in the present system.
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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2024
·
IF 5.8
Xiaohua Zheng,Mengnan Xu,Chenbin Cai,Yanhaohan Yuan,Feng Lin,Wei Chen,Fanger Yang
Photocatalysis is a green approach to solving energy and environmental problems, and researchers are still pursuing high-performance photocatalysts . Although BiOX (X = Cl or Br) has a suitable bandgap and good stability, its photoresponse is mostly concentrated in the UV region. Conversely, SnS 2 has a wide photoresponse range but exhibits perceptible photocorrosion and poor stability. To exploit the advantages of both BiOX and SnS 2 , this study hydrothermally synthesized and introduced superfine SnS 2 (∼30 nm in size) into a BiOCl/BiOBr binary system to fabricate BiOCl/BiOBr/SnS 2 composites. Subsequently, the degradation performance of these composites in a Rhodamine B solution under visible light was investigated. Results show that the BiOCl/BiOBr/SnS 2 heterojunctions were successfully prepared and the composites exhibited the best photocatalytic performance with 6% mass fraction of SnS 2 (BiOCl-to-BiOBr mol ratio = 1:1). The formation of a double S-schedule heterojunction between BiOCl/BiOBr and SnS 2 not only accelerated charge separation and transfer but also broadened the photoresponse range and reduced photoelectron–hole recombination under full-spectrum irradiation. Loading a small narrow-bandgap photocatalyst onto a large photocatalyst provides an effective way to construct heterojunctions with excellent photocatalytic performance. The ternary photocatalyst presents a favorable photocatalytic stability, and its photodegradation rate is 4.6, 4.5 and 220.5 times that of BiOCl, BiOBr and SnS 2 , respectively.
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
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 6
·2162-2171
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IF 3.343
Wei Li,Shu-ao He,Xiao Wang,Qiong Ma,Chen-hui Zhao
Summary β-iron oxide hydroxide (β-FeOOH) had been proven to be an effective co-catalyst during H 2 evolution reaction (HER) process. In this research, a BiOCl/β-FeOOH heterojunction was successfully synthesized by a solid-state doping method. Then, the structure, composition, and photo-electrochemical properties of the prepared photocatalysts were studied. For the superior HER photocatalytic activity of ultrasmall β-FeOOH nanoparticles (NPs) and the formation of the BiOCl/β-FeOOH heterojunction, this heterojunction photocatalyst exhibited very superior photocatalytic performance in the HER process. Especially, when the amount of incorporated β-FeOOH NPs was appropriate, the BFOH-2 possessed the highest photocatalytic activity in HER process, and the HER rate was about 16.64 mmol·g −1 ·h −1 during illuminated time of 6 hours under visible light. When appropriate, ultrasmall β-FeOOH NPs were implanted into the structure of BiOCl, the BiOCl/β-FeOOH heterojunction interfaces would form for the existence of interfacial interactions. Therefore, this BiOCl/β-FeOOH heterojunction exhibited superior visible-light response, fast photo-carrier migration, and high-efficient separation of photo-carriers, so that the BFOH-2 heterojunction possessed high-efficient hydrogen evolution reaction (HER) photocatalytic activity.
研究领域:
材料科学
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光催化
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Xiaoman Yu,Menglin Liu,Haiming Xu,Jian Xu,Jiarui Yi
Enhancing adsorption ability of photocatalyst by vacancy is a fascinating strategy. Thus, Bi 2 WO 6 /BiOCl with millefeuille-like was successfully prepared via multi-pots method. Experimental results discern that BOW-10 can degraded 75.19% doxycycline hydrochloride (DOC, 20 mg/L) in 1 h, which is 1.3 and 3.5-fold larger than Bi 2 WO 6 and BiOCl, respectively. The mechanism revealed that OVs (oxygen vacancies) not only promote the adsorption of DOC and O 2 but also augment the activation ability of molecular oxygen. Therefore, photo-induced electrons can rapidly transfer from BiOCl to Bi 2 WO 6 via carrier transport channels formed by interface oxygen vacancies (IOVs) under interfacial electric field (IEF) to reduce the adsorbed O 2 . Finally, DOC was eliminated by O 2 ˙ - and h + . Moreover, the relationship of surface areas, OVs concentration and the separation efficiency of photo-generated carriers was constructed. Meanwhile, the degradation paths of DOC and the toxicity of the intermediates were comprehensively investigated through DFT theoretical calculation. This research provides an innovation approach to regulate the capability of pollution adsorption and molecular oxygen activation by vacancy engineering and heterostructure engineering.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 14
·12241-12250
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IF 2.324
Sun Jingyu,Li Dongya,Cai Yujie,Zou Zhongwei,Zhang Hua,Gong Jiayang,Sun Lei,Xu Haiming,Xia Dongsheng
High content oxygen vacancies BiOCl consisted of thinner nanosheets was successfully synthesized assisted with ammonium sulfamate (AS) via a facile solvothermal route. X-ray powder diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), UV–Vis diffused reflectance spectra (DRS), temperature programmed oxidation (O 2 -TPD), photoluminescence (PL), electrochemical impedance spectroscopy (EIS), and electron spin resonance (ESR) were applied to characterize the structure, morphology as well as the physicochemical properties of as-synthesized samples. The results confirm that AS and the mix solution pH have great effect on the BiOCl properties. BOC-2 ( k = 0.484 min − 1 ) due to its high content oxygen vacancies exhibits 23 times high visible photocatalytic performance than BOC ( k = 0.021 min − 1 ) for degradation of Rhodamine B (RhB), and enhanced photodegradation of antibiotic tetracycline hydrochloride (TC-HCl) solution. This work provides new insights on controllable synthesis of highly active BiOCl with different content oxygen vacancies.
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
ACS Omega
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2020
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IF 2.87
Qiao Chen,Ning-bo Feng,Xian-he Huang,Yao Yao,Ying-rong Jin,Wei Pan,Dong Liu
The performance of a bismuth oxychloride (BiOCl)-based quartz crystal microbalance (QCM) humidity sensor was studied using an oscillating circuit method. The BiOCl powder was prepared by a hydrolysis method. Scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used to characterize the BiOCl sample. Its humidity-sensing property was analyzed by combining it with a QCM at room temperature (25 °C). Experimental results indicated that the BiOCl-based QCM sensor showed good humidity characteristics from 11.3 to 97.3%, such as good logarithmic frequency response to humidity levels (R2 = 0.994), fast response time (5.2 s)/recovery time (4.5 s), good reversibility, stability, repeatability, and low humidity hysteresis. In addition, the response to human nose breaths showed excellent practicability. Finally, the humidity sensing mechanism of the BiOCl-based QCM humidity sensor was discussed in detail. This work demonstrates that BiOCl is a promising candidate material for humidity detection.
研究领域:
材料科学
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传感器技术
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Bingxin Yuan,Meiting Li,Chi Zhang
BiOCl micro/nanoplates and their hierarchical architectures were selectively synthesized via 24 h of hydrothermal reaction at 180 °C and a wide range of solution pH (2–12), where the vital role of solution pH in phase/morphology evolution were elaborated from solution chemistry and crystal facet engineering. It was unambiguously demonstrated that a higher solution pH retarded the binding interaction between H + and oxygen-terminated {001} facets, and also yielded more oxygen vacancies. Therefore, the ab -dominated hierarchical self-assembly was the result. Analysis of photocatalytic properties further manifested that the significant exposure of ab plane is beneficial to photocatalysis. The best pH = 10 catalyst showed the strongest UV absorption, ∼98.5 % of removal efficiency toward the methyl orange molecules within 20 min of simulated solar light irradiation and favorable reusability, while the values are only ∼55.21 % and 50.75 % for the pH = 2 and pH = 12 ones, respectively. This systematic study facilitates a better understanding of photoreaction mechanism of the compound by considering oxygen vacancy defects and electron-hole interaction.
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
SOLAR ENERGY
·
2020
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IF 4.608
Jianhua Hou,Qian Dou,Ting Jiang,Jin Yin,Junli Liu,Yuanyuan Li,Geshan Zhang,Xiaozhi Wang
Bismuth oxychloride (BiOCl) has great potential as a photocatalytic material. It is worthy to improve its photocatalytic performance by a simple and feasible method. In this work, withered cattail is carbonized directly at 800 ℃ in nitrogen atmosphere to obtain cattail carbon with good conductivity, which could be a good acceptor of photogenerated electrons. Through the one-step facile co-precipitation route with stirring at room temperature followed by the treatment of acetic acid, ultrathin nanosheets of BiOCl were synthesized and grew on the surface of cattail carbon. The BiOCl/cattail carbon composites have well-contacted heterojunction interface, hierarchical structure, high specific surface area and enhanced utilization of visible light, which allow the composites to separate the photogenerated electron-holes efficiently. Thus the BiOCl/cattail carbon composites could show excellent photocatalytic activity, which could remove rhodamine B completely within one hour under visible light. The degradation rate of the composite could achieve about 17 times higher than that of pure BiOCl. Mechanism test showed that both OH and h + active species could work together to degrade organic pollutants. Therefore, our work combines readily available and inexpensive biochar materials with BiOCl, which provides a strategy for the low-cost synthesis of efficient BiOCl-based photocatalytic materials that can be used in large-scale industrial production to be applied in the treatment of organic wastewater.
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
FUEL
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2022
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IF 8.035
Jiaxiu Guo,Ting Shen,Juan Liang,Shulin He,Yue Jing,Yinghao Chu,Wanglai Cen
In this paper, an N -doped BiOCl photocatalyst was prepared and systematically characterized. The results showed that N doping does not change the crystal phase of BiOCl but changes the surface morphology of BiOCl nanosheets and increases specific surface area. N -doped BiOCl broadens the light absorption region, narrows the band gap and promotes the separation of the photoexcited carriers. N could be adsorbed on the Bi or to replace Cl atom in the BiOCl lattice, causing the generation of intermediate energy levels in the band gap of N -BiOCl including N 2p-Cl 2p hybrid states, N 2p-O 2p hybrid states or N 2p state. N -BiOCl achieves about 60% removal efficiency of NO under all-light irradiation and exhibits favorable stability and recyclability. The presence of some H 2 O in the reaction system promotes the photodegradation of NO, while O 2 greatly affects the efficiency of NO removal. Moreover, N doping promotes the formation of •O 2 − and •OH on N -BiOCl photocatalyst under all-light irradiation, resulting in the enhancement of photocatalytic oxidation of NO to NO 3 – . NO could be adsorbed on the surface of N -BiOCl or oxidized into NO 2 – under darkness and further oxidized into NO 3 – under all-light irradiation. However, the accumulation of the final product on the catalyst surface results in a decrease in photoactivity.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 21
·10573-10581
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IF 6.233
Jing Jiang,Lizhi Zhang,Hao Li,Weiwei He,Jun Jie Yin
In this study we demonstrate that self-doping and surface plasmon resonance could endow a wide-band-gap ternary semiconductor BiOCl with remarkable visible light driven photocatalytic activity on the degradation of organic pollutants and photocurrent generation properties. The self-doped BiOCl with plasmonic silver modification was synthesized by a facile one-pot nonaqueous approach and systematically characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-visible diffuse reflectance spectra, electron spin resonance, and X-ray photoelectron spectroscopy. The photocurrent enhancement was found to be intimately dependent on the irradiation wavelength and matched well with the intensity of the absorption of the Ag nanoparticles. Reactive species trapping experiments and electron spin resonance spectroscopy with 5,5-dimethyl-1-pyrroline-N-oxide spin-trapping adducts confirmed that more oxidative species could be generated from the photogenerated electrons due to the plasmon-excitation of the metallic Ag in the self-doped BiOCl with plasmonic silver modification, which is responsible for the great enhancement of photocatalytic activity and photocurrent. Surface photovoltage spectroscopy and time-resolved photoluminescence spectroscopy results revealed the transfer of plasmon-band-induced electrons from Ag nanoparticles into BiOCl and the acceleration effect of surface plasmon resonance-induced intense oscillating electric fields on this electron transfer. This study would not only provide direct evidence of plasmonic photocatalysis, but also shed light on the design of highly efficient metal–semiconductor composite photocatalysts.
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 WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2025
·Vol. 40
·期 3
·650-659
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IF 1.1
Zheng Jingyan,Deng Yichao,Xu Mengying,Li Lian,Tremblay Pier-Luc,Zhang Tian
Ti 3 C 2 /BiOCl composite was successfully synthesized by combining BiOCl (BOC) with an exposed (110) crystal plane and Ti 3 C 2 using a simple hydrothermal process. The photocatalytic performance of produced composite was evaluated using the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH) under visible light. The results demonstrated that Ti 3 C 2 /BOC composite had higher photocatalytic activity than pure BOC. The optimum incorporation amount of Ti 3 C 2 was 2 wt%. The photodegradation rate of 2 wt%-Ti 3 C 2 /BOC at 10 min to 20 mg/L RhB was 97.6%, which was much higher than that of BOC (75.3%). Similarly, the photodegradation rate of 2 wt%-Ti 3 C 2 /BOC to 10 mg/L TCH at 30 min was 80.4%, which was higher than BOC (68.1%). In addition, the prepared 2 wt%-Ti 3 C 2 /BOC composite also maintained good stability even after four cycles. Electrochemical impedance spectroscopy (EIS), transient photocurrent response (IT) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis) confirmed that the photoelectrochemical properties of 2 wt%-Ti 3 C 2 /BOC composite were significantly improved. On the basis of analyzing the action mechanism of photocatalyst, it was pointed out that ·O 2 - and h + were the main active substances in the photodegradation of RhB and TCH by 2 wt%-Ti 3 C 2 /BOC.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 16
·1352
·
IF 4.4
Teng Gao,Hongqi Chu,Shijie Wang,Zhenzi Li,Wei Zhou
Photocatalysis is the most promising green approach to solve antibiotic pollution in water, but the actual treatment effect is limited by photocatalytic activity. Herein, Bi and BiOCl were loaded onto the surface of Ce-MOF (metal–organic framework) using an electrostatic adsorption method, and a special ternary heterojunction of Ce/Bi/BiOCl was successfully prepared as a photocatalyst for the degradation of tetracycline (TC). FTIR demonstrated that the obtained photocatalyst contains functional groups such as -COOH belonging to Ce-MOF and characteristic crystal planes of Bi and BiOCl, indicating the successful construction of a ternary photocatalyst. The results of UV–vis absorption spectra confirm that the band gap of Ce/Bi/BiOCl heterojunction is reduced from 3.35 eV to 2.7 eV, resulting in an enhanced light absorption capability in the visible light region. The special ternary heterojunction constructed by Ce-MOF, Bi, and BiOCl could achieve a narrow band gap and reasonable band structure, thereby enhancing the separation of photogenerated charges. Consequently, the photocatalytic performance of the Ce/Bi/BiOCl ternary heterojunction was significantly enhanced compared to Ce-MOF, Bi, and BiOCl. Therefore, Ce/Bi/BiOCl can achieve a photocatalytic degradation rate of 97.7% within 20 min, which is much better than Bi (14.8%) and BiOCl (67.9%). This work successfully constructed MOF-based ternary photocatalysts and revealed the relationship between ternary heterojunctions and photocatalytic activity. This provides inspiration for constructing other heterogeneous catalysts for use in the field of photocatalysis.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
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