MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2023
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IF 4.1
Jingjing Dang,Jianxu Zhang,Yun Shen,Liping Wang,Feng Guo,Yuliang Li,Weisheng Guan
The establishment of Z-scheme heterojunction with ascendant redox ability presents a potential application prospect in the development of efficient photocatalysts for environmental purification. Herein, the Z-scheme Fe 3 O 4 /BiOCl/BiOBr heterostructure composite with preeminent retrievability was obtained using a facile solvothermal method. The various physicochemical properties of the acquired materials were explored through systematic characterizations. The Fe 3 O 4 /BiOCl/BiOBr ternary photocatalyst possessed excellent photocatalytic degradation efficiency (85%) towards tetracycline (TC) under simulated sunlight irradiation. Given the results of capturing experiments, superoxide radicals (·O 2 − ) and holes (h + ) made predominant contributions to the photodegradation reaction. The enhanced photocatalytic activity of Fe 3 O 4 /BiOCl/BiOBr was mostly resulted in the framework of Z-scheme heterojunction, which led to the efficient migration of the photoinduced carriers. In addition, Fe 3 O 4 /BiOCl/BiOBr exhibited good recyclability and stability while retaining its high photocatalytic activity. It was expected that this work would create a new opportunity to fabricate magnetically recyclable photocatalysts with Z-scheme heterojunction for efficient removal of antibiotic pollutants.
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
Nano Materials Science
·
2025
·
IF 17.9
Tingfang Xie,Shaodong Sun,Fangyuan Wang,Meiqi Ding,Jie Cui
Interface engineering has emerged as an effective strategy for addressing challenges related to insufficient solar light harvesting and poor photocharge separation in photocatalysis. The distinctive in-plane homogeneous architecture offers the potential for significant enhancements in both photocharge separation and solar light absorption. Herein, a simple one-pot hydrothermal method was developed to construct in-plane homogeneous BiOCl bicrystals within BiOCl nanosheets (BOC-B). During this process, thiourea plays a pivotal role in introducing dislocations to form bicrystal structure. As expected, the synthesized BOC-B samples exhibited substantially higher photocatalytic degradation activity for TC and RhB compared to BOC. Notably, the mechanism underlying effective solar light absorption and charge carrier separation, driven by the homogeneous bicrystal structure, was elucidated through a series of experimental evidences. This work introduces a novel homogeneous bicrystal structure in BiOCl photocatalysts to optimize catalytic activity, providing a framework for developing new BiOCl-based photocatalysts.
研究领域:
材料科学
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纳米技术
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环境科学
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Faxiang Feng,Zanming Zhu,Jiale Li,Shi Su,Guilin Dong,Guanhui Wang,Xiaobing Liu,Runlin Han
The widespread use and even abuse of antibiotics has led to antibiotic wastewater posing a serious threat to global human health. However, due to its poor biodegradability, the effectiveness and cost of traditional wastewater treatment technologies in the field of antibiotic wastewater treatment remain challenging. This study introduces BiCl₃ into a polyimide (PI) solution and employs electrospinning technology to fabricate PI fiber membranes with high BiOCl loading in-situ, demonstrating outstanding photocatalytic performance. The photocatalytic performance of PI/BiOCl nanocomposite membrane was investigated in detail and the mechanism of photocatalytic degradation was explored. Experimental results demonstrate that the nanocomposite membrane exhibited excellent hydrophilicity. It exhibits significant efficacy in degrading tetracycline hydrochloride (TC). Under UV irradiation, it achieves a photodegradation efficiency of 99.3 % for TC within 8 h. After five cycles, the membrane maintained over 90.3 % degradation efficiency for TC, with photodegradation efficacy declining by only 9.1 %. It was found that the photocatalytic degradation of TC was mainly induced by superoxide radical (·O 2 − ). The membrane exhibits excellent stability, recoverability, and reusability, sustaining consistent degradation performance during prolonged operation. This approach offers a novel perspective for future research into developing more efficient and environmentally friendly materials for degrading tetracycline hydrochloride.
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 6
·1362
·
IF 4.2
Zisheng Shi,Wei Chen,Yin Hu,Fen Zhang,Lingling Wang,Dan Zhou,Xuanye Chen,Sugang Meng
In recent years, oxygen vacancy (VO) engineering has become a research hotspot in the field of photocatalysis. Herein, an efficient GQDs/BiOCl-VOheterojunction photocatalyst was fabricated by loading graphene quantum dots (GQDs) onto BiOCl nanosheets containing oxygen vacancies. ESR and XPS characterizations confirmed the formation of oxygen vacancy. Combining experimental analysis and DFT calculations, it was found that oxygen vacancy promoted the chemical adsorption of O2, while GQDs accelerated electron transfer. Benefiting from the synergistic effect of oxygen vacancy, GQDs, and dye sensitization, the as-prepared GQDs/BiOCl-VOsample exhibited improved efficiency for RhB degradation under visible-light irradiation. A 2 wt% GQDs/BiOCl-VOcomposite effectively degraded 98% of RhB within 20 min. The main active species were proven to be hole (h+) and superoxide radical (·O2−) via ESR analysis and radical trapping experiments. This study provided new insights into the effective removal of organic pollutants from water by combining defect engineering and quantum dot doping techniques in heterojunction catalysts.
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
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
·
IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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
ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Qiaoying Li,Zhipeng Guan,Di Wu,Xiuge Zhao,Shenyuan Bao,Baozhu Tian,Jinlong Zhang
Although semiconductor photocatalysis has made great progresses as a promising solution to solve the problem of environmental pollution, the highly efficient decomposition of organic pollutants driven by sunlight is still a challenge. Herein, we successfully constructed a Z-scheme photocatalyst BiOCl-Au-CdS for the first time by stepwise deposition of Au and CdS. It was found that the Au nanoparticles (NPs) were selectively anchored on the {001} facets of BiOCl nanosheets in the process of photoreduction while CdS NPs were further in situ deposited on Au NPs via the strong S–Au interaction. Compared to BiOCl, BiOCl-Au, and BiOCl-CdS, the Z-scheme BiOCl-Au-CdS exhibited evidently higher sunlight-driven photocatalytic activity toward the degradations of anionic dye Methyl Orange, cationic dye Rhodamine B, colorless pollutant phenol, and antibiotic sulfadiazine. The radical trapping experiments indicated that ·OH, h+, and ·O2– are the main reactive species responsible for the degradations of organic pollutants over BiOCl-Au-CdS. Based on the photoelectrochemical measurements, PL spectra, and band potential calculation, it can be concluded that the Z-scheme structure of BiOCl-Au-CdS not only retains the photogenerated electrons and holes with higher redox ability but also decreases their recombination rate. As a highly efficient sunlight driven photocatalyst, BiOCl-Au-CdS can be potentially used in environmental pollutant remediation.
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 Advances
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2021
·Vol. 3
·期 16
·4851-4857
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IF 4.553
Xiaoli Yang,Shaodong Sun,Jie Cui,Man Yang,Qing Yang,Peng Xiao,Shuhua Liang
Heterojunction engineering is an effective strategy to enhance the photodegradation activity via improving the spatial charge separation. However, the poor interface interactions and stability limit the photocatalytic activity and stability of traditional heterojunctions. Herein, robust BiOCl/ZnO p–n heterojunctions with semi-coherent interfaces were prepared by a one-pot hydrothermal method to improve the activity and stability toward photocatalytic degradation than that of the counterpart, in which the semi-coherent interfaces exhibited lower phase boundary energy, resulting in highly-stable interfaces between BiOCl and ZnO as well as the formation of the built-in electric field in this robust p–n heterojunction for enhanced charge separation. The cycle test results verified that the BiOCl/ZnO heterojunctions with semi-coherent interfaces can maintain the photocatalytic degradation activity at the initial level even after 10 cycles, while deactivation of the sample without semi-coherent interfaces occurred after 3 cycles only. Optical and electrical properties revealed that BiOCl/ZnO heterojunctions with semi-coherent interfaces possessed the highest electron migration and charge separation efficiency, resulting in the highest photodegradation activity. Density functional theory (DFT) calculations and electron spin-resonance (ESR) results verified that the enhanced charge separation was assigned to the type-II photocatalytic mechanism, leading to the enhancement of ˙OH and ˙O2− reactive oxygen species. This work would provoke the development of one-step construction of new highly active BiOX (X = Cl, Br, and I)-based heterogeneous photocatalysts with stable semi-coherent interfaces.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jun Liu,Hui Wang,Meng-Jie Chang,Meng Sun,Zhi-Wei He,Cong-Miao Zhang,Wen-Yao Zhu,Jia-Liang Chen,Hui-Ling Du,Long-Gui Peng,Zhen-Min Luo,Li Zhang
Magnetically separatable CoFe 2 O 4 /BiOCl (CFO/BOC) fibers were facilely prepared by solvothermal growth of BiOCl on hollow electrospun CoFe 2 O 4 nanofibers in a weak reduction ethylene glycol (EG) solvent for visible light photocatalytic degradation of various contaminants. Due to the defect level resulted from the oxygen vacancies (OVs), evident visible light response and enhanced charge transfer are achieved both for the solo BiOCl spheres and nanosheets on the CoFe 2 O 4 fibrous support. The optimum CFO/BOC synthesized at 160 °C with a precursor concentration of 50 mM shows outstanding photocatalytic activity to degrade different pollutants of Rhodamine B (RhB, 92.9%), Norfloxacin (NOR, 75.5%), and Cr(VI) (78.0%) within 2 h under visible light. The CoFe 2 O 4 nanofibers are not pivotal for the photocatalytic process, but mainly contribute to the photocatalysis as magnetic support, ensuring the CFO/BOC no aggregation and easy collection under an external magnet. In contrast, the OVs play an important role in the visible light absorption , reactive oxygen species generation and redox process during the photocatalytic process. In detail, both photosensitization of RhB and species of h + and·O 2 - contribute to the degradation of RhB, while NOR decomposition is accomplished by three species (h + ,·O 2 - ,·OH). In addition, electrons are the main reactive species for the photoreduction of Cr(VI). Compared to current reported CoFe 2 O 4 /BiOI photocatalysts , significant advances for the CFO/BOC are obtained not only for the cheap BiOCl with OVs for the photocatalytic application, but also much clearer investigation of more details of CFO/BOC photocatalysts such as light absorption, charge transfer and active species for the degradation of various pollutants.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yujie Luo,Shiyu Zhou,Yaofang Sun,Deqiang Zhao,Xiaosong Gu,Qiutong Yan,Fangying Ji,Xuan Xu
To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF 4 :Yb 3+ , Er 3+ @BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity . Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
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 PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Dafeng Zhang,Changhua Su,Shujuan Yao,Hong Li,Xipeng Pu,Yanling Geng
BiPO 4 /BiOCl p-n heterojunction photocatalysts were successfully prepared by a facile in situ chemical transformation method with the aim of degrading rhodamine B under simulated sunlight. X-ray diffraction, field emission scanning electron microscopy , ultraviolet–visible diffuse reflectance spectroscopy , photoluminescence , and electrochemistry tests were used to characterized the structure, morphology, optical properties , and inhibited recombination of photoinduced charges. BiPO 4 /BiOCl composites exhibited significantly higher photocatalytic activity for the degradation of rhodamine B than pure BiOCl, and the apparent rate constant is 3.18 times higher than that of BiOCl. The significantly increased photocatalytic activity of the BiPO 4 /BiOCl composites can be ascribed to the formation of a p-n heterojunction , which can effectively boost the separation of photoinduced electron-hole pairs during the photocatalytic process. Additionally, the main active species were investigated and a plausible mechanism is proposed.
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 MATERIALS SCIENCE
·
2016
·Vol. 51
·期 9
·4342-4348
·
IF 2.302
Xu Yanqiu,Hu Xiulan,Zhu Haikui,Zhang Jianbo
Bismuth oxychloride (BiOCl) with tunable structures and morphologies were successfully synthesized through a facile solvothermal method in water–methanol solution. Size and shape of BiOCl could be effectively tuned by adjusting the volume fraction of water in water–methanol solution. With the increasing water content, BiOCl grows along the c -axis [001] orientation, and the exposure of {001} facets also increases. In the case of 10 % water, dispersed BiOCl nanoplates with the size of 200 nm and the thickness of 40 nm were obtained instead of microspheres as obtained in pure methanol. These BiOCl nanoplates showed higher photocatalytic activity toward methyl orange (MO) than BiOCl microspheres and higher degradation activity for rhodamine B (RhB) than P25. The excellent photocatalytic activity of BiOCl nanoplates could be mainly attributed to its effective separation of electron–hole pairs, increased exposure of {001} facets, and reductions in size and thickness. And BiOCl nanoplates prepared with 15 % water exhibit promising oxygen reduction reaction performance in alkaline electrolyte (KOH) due to the increased exposure of {001} facets.
研究领域:
材料科学
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纳米技术
·
环境科学
·
电化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
X. Sun,M. Wang,Y.Q. Ma
For the first time, magnetic nano-structures (MNS) of 2D ε-Fe 3 N nano-sheets and 1D Fe 3 O 4 /Fe 3 N heterogeneous nano-chains were synthesized through electrochemical anodization without the assistance of any templates or surfactants. 2D BiOCl nano-sheets were intimately grown on surfaces of these MNS via the vapor-thermal method and isopropanol and ethylene glycol acting as solvents. As a result, 2D-2D and 1D-2D magnetic photocatalysts were achieved. MNS function as directing agents of BiOCl growth and control the oriented growth of BiOCl; furthermore, they compress the BiOCl crystal lattice due to the strain at the interface between MNS and BiOCl. BiOCl grown on 2D nano-sheets exhibits a flower-like morphology that consists of square nanosheets, while exhibiting the morphology of epispastic sponge for BiOCl grown on 1D heterogeneous nano-chains. To the best of our knowledge, this has not been reported before. The synergistic effects of MNS and BiOCl enhance the absorbance in the visible-light spectrum. All magnetic photocatalysts exhibited excellent adsorption and degradation abilities to target pollutants such as rhodamine B, methylene blue, and phenol. Here, using MNS as directing agents opens up a new route to realize the oriented assembly and growth of BiOCl nanosheets; this strategy can be adjusted for the synthesis of other catalysts.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
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