OPTICAL MATERIALS
·
2023
·
IF 3.9
Min Liu,Junzi Huang,Huihui Xie,Salman Riaz,Wenbo Fan,Weitao Han,Liang Li,Peng Wei,Yahong Xie,Ying Qi
In this work, we designed the plasmonic photocatalyst of Au–BiOCOOH through a one-pot method, which can be used to effectively treat wastewater contaminated with rhodamine (RhB) and tetracycline (TC). Compared with neat BiOCOOH, as expected, the resulting Au–BiOCOOH illustrated significantly boosted photocatalytic efficiency for degrading RhB and TC under visible light illumination. Remarkably, 3.0%Au–Bi showed the most optimal performance against RhB and TC, achieving degradation rates of 99.5 % and 99.7 % within 120 min. Through multiple characterization techniques, the physical and chemical photoelectric properties of the photocatalyst as well as the photocatalysis mechanism were discussed in detail. UV–visible diffuse reflectance spectroscopy (DRS) analysis demonstrates that the loading of Au nanoparticles (Au NPs) onto 2D nanosheets of BiOCOOH significantly expanded the wavelength range of response of BiOCOOH to visible light. Separately, the outcomes of electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) manifestly reveal that the presence of Au NPs on BiOCOOH can efficiently reduce the interfacial charge transfer resistance and accelerate the photogenerated charge transfer. The free radical trapping test provided evidence for the essential role played by holes (h + ) and superoxide radicals (·O 2 − ) were involved in the degradation of RhB. The study provided a possibility to improve the photocatalytic efficiency of BiOCOOH.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yuexiang Wang,Hui Zhou,Jing Kong,Ming Shen
A broad-spectrum responsive organic-inorganic heterojunction was synthesized by in-situ self-assembled perylene diimide (PDIsm) through π-π stacking onto the surface of flower-like BiOCOOH. The PDIsm/BiOCOOH with different compositions exhibited enhanced photocatalytic degradation of levofloxacin under visible light irradiation. Among them, 10% PDIsm/BiOCOOH had the best photocatalytic activity, which was 4.6 and 14.1 times higher than pure PDIsm and BiOCOOH, respectively. The enhancement of photocatalytic activity was mainly attributed to the introduction of PDIsm which significantly improved the light absorption in almost the whole visible light range. Besides, the formed heterojunctions facilitate the separation and transfer of photogenerated charge carriers. In addition, after five cycles of degradation, the degradation rate of the PDIsm/BiOCOOH composite for levofloxacin hydrochloride remained above 75%, indicating its good photocatalytic activity and stability. Furthermore, free radical capture experiments and electron spin resonance experiments verify that •O 2 ‾ and h + were the active species generated in the photocatalytic process. Combining the experimental results of high-performance liquid chromatography-mass spectrometry, a possible photocatalytic reaction mechanism was proposed. This work provides a way to prepare an efficient organic-inorganic photocatalyst , which can potentially be utilized in environmental remediation under visible light.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiawen Zhang,Haoyang Xu,Yage Zheng,Yue Shen,Chaoqun Mu,Yao Wang,Aili Niyazi,Zhixian He,Zhiqiang Zhang,Liang Zhang,Juanqin Xue
In this work, a Z -scheme heterostructured BiOCOOH/O-gC 3 N 4 material was synthesized and immobilized on chitosan (CTS) to obtain the BiOCOOH/O-gC 3 N 4 /CTS photocatalytic material for photocatalytic degradation of oxytetracycline hydrochloride (CTC).Our findings indicate that the composite material BiOCOOH/O-gC 3 N 4 , as well as the BiOCOOH/O-gC 3 N 4 /CTS composite membrane , displayed a significantly higher efficiency in photocatalytic degradation of CTC compared to BiOCOOH alone, owing to the synergistic effect of adsorption and photocatalysis . Following four cycles of use, the composite material retained around 96 % of its initial photocatalytic degradation activity. The addition of CTS in the photocatalytic material resolved issues such as aggregation and difficult recovery commonly encountered with powder materials, thereby facilitating effective collision between the photocatalytic active sites and CTC. Experimental and theoretical calculations provided confirmation that the combination of BiOCOOH and O-gC 3 N 4 effectively enhanced the light absorption capacity and photocatalytic performance. Furthermore, we investigated the influence of environmental factors such as pH value and anions on the photocatalytic degradation experiment, which offers valuable insights for the application of composite catalysts in wastewater treatment .
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
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 29
·14056-14067
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IF 3.3
Yanan Duan,Jianjiang Lu,Yujun Yan,Yanbin Tong,Yalong Song,Jinfeng Xiao
The construction of photocatalysts that can activate persulfate (PS) efficiently is the key to the removal of water pollutants. In this study, a BiOI/BiOCOOH (IB) composite photocatalyst was prepared via an ultrasound-assisted solvothermal method, which activated PS under visible light to efficiently degrade ciprofloxacin (CIP). Compared with those of pure BiOCOOH and BiOI, the photocatalytic activity of IB was significantly improved. The 0.5 IB/PS system exhibited a maximum CIP (10 mg L−1 50 mL) degradation rate of 95.10% after 90 min of irradiation, and the photoreaction rate constant was 0.0304 min−1, which was 100.7-fold that of BiOCOOH/PS, respectively. Through photolysis experiments involving different water quality and other antibiotics and dyes, the practical application potential and universal ability of the 0.5 IB/PS system were revealed. After five cycles, the degradation rate of CIP decreased by only 13.33%, which showed good cyclic stability. On the basis of a quenching experiment and electron spin resonance measurement, a stepped heterojunction photocatalytic mechanism involving charge transfer and separation was proposed. In addition, the degradation pathway of CIP was proposed based on LC–MS analysis. This work shows that the strategy of constructing a heterojunction photocatalyst to activate PS has great application potential in environmental water 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
Journal of Water Process Engineering
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2020
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IF 3.465
Haijin Liu,Hui Zhang,Min Chen,Chaonan Zhang,Cuiwei Du,Jianbiao Peng,Kai Jiang
Photocatalysis is an efficacious technology for pollutants degradation ; however, there remains ample room for the improvement of its degradation efficiency. Herein, a system involving a g-C 3 N 4 /BiOCOOH photocatalyst coupled with peroxymonosulfate (PMS) was developed, using Malachite green (MG), Rhodamine B (RhB), ciprofloxacin hydrochloride (CIP), and levofloxacin hydrochloride (LVF) as target pollutants. The prepared g-C 3 N 4 /BiOCOOH nanocomposites were systematically characterized. In contrast to pure g-C 3 N 4 or BiOCOOH, the photocatalytic activities of the nanocomposites were enhanced due to the formation of g-C 3 N 4 /BiOCOOH heterojunctions , extensive specific surface areas, and more efficient charge separation. The degradation of RhB, MG, CIP, and LVF was further improved in this g-C 3 N 4 /BiOCOOH/PMS system due to the synergistic effects between the photocatalysts and PMS (the degradation of MG in the photocatalyst/PMS system was four fold that of a single photocatalyst system). An exploration of these synergetic mechanisms indicated that · O 2- and 1 O 2 were the most significant reactive oxygen species in the single photocatalysis system, whereas in the photocatalyst/PMS system, additional 1 O 2 was generated due to the addition of PMS, and became the dominant species. This research suggests that the combination of photocatalysts and PMS is a feasible strategy for improving the pollutant removal activities of photocatalysts, which have strong potential for myriad applications in environmental remediation.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
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2022
·
IF 4.969
Cong Lu,Haifeng Zhou
The easy recombination of electron-hole pairs produced by monomeric photocatalysts under light exposure severely limits their application in wastewater treatment. Based on this, BiOCOOH/Ag/AgBr ternary photocatalysts in flower-like microspheres were controllably synthesized by precipitation photoreduction and characterized by various techniques. In addition, the effects of different molar ratio of BiOCOOH and AgBr, catalyst dose, pH and coexisting ions on the photocatalytic degradation of rhodamine B (RhB) and tetracycline (TC) were investigated. The results showed that the BOC/Ag/AgBr-0.5 composite exhibited excellent photocatalytic activity for the degradation of RhB and TC. The excellent photocatalytic activity was mainly attributed to the surface plasmon resonance (SPR) effect of metallic Ag and charge transfer mechanism between composites, thus promoting charge separation. The degradation efficiency of RhB and TC was 92.7% and 72.3% with the degradation rate constant of 0.073 and 0.023 under light irradiation of xenon lamp in 30 and 45 min, respectively, which was 6 and 2 times higher than that of BiOCOOH and AgBr. The stability studies showed that BOC/Ag/AgBr-0.5 maintained a high catalytic activity after four cycles. The results of radical capture experiments showed that h + and · O 2 – were the main reactive radicals, while · OH played a secondary role in the photocatalytic system. Subsequently, a potential photocatalytic mechanism was proposed based on the experimental results.
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
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Ping Chen,Qianxin Zhang,Yuehan Su,Lingzhi Shen,Fengliang Wang,Haijin Liu,Yang Liu,Zongwei Cai,Wenying Lv,Guoguang Liu
A visible light-driven and environmentally compatible photocatalyst is considered to be a potential application for wastewater treatment processes. In the present study, we employed carbon quantum dots (CQDs) to modify BiOCOOH with the aim of negating the UV limit of the photocatalyst, while increasing its photocatalytic activity. The structure, morphologies, and other characteristics of CQDs/BiOCOOH composites were investigated, which confirmed that CQDs were successfully coupled with BiOCOOH. Under visible light irradiation, a very low CQDs content of 2.0% weight resulted in a 4.64-fold more rapid reaction rate in the photodegradation of diclofenac (DCF) than pristine BiOCOOH. The CQDs served to enhance the visible light absorption of BiOCOOH, which significantly improved visible-light harvesting, as well as interfacial charge transfer and separation. Through a new model study it was revealed that O 2 − was predominantly responsible for DCF degradation. Based on mass spectrometry and theoretical calculations, primary intermediates were identified, and the key pathways proceeded mainly through e − reduction, O 2 − attack, and OH addition reactions. The Vibrio fischeri , Desmodesmus subspicatus , and Daphnia magna were selected to evaluate the acute toxicity, which initially increased and further decreased when the total organic carbon and organic chlorine compounds were reduced. The excellent dechloridation, mineralization, and detoxicity properties via the synthetic CQDs/BiOCOOH photocatalysts clearly demonstrated the potential of this strategy.
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
Surfaces and Interfaces
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2023
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IF 6.2
Yue Shen,Haoyang Xu,Yage Zheng,Yao Wang,Liang Zhang,Zhiqiang Zhang,Lvling Zhong,Zhixian He
The development of a low-cost and recyclable method for wastewater treatment has been a major challenge. Polyvinylidene fluoride (PVDF) membranes have received considerable attention owing to their excellent mechanical strength , unique antioxidant properties, and low cost. In this study, Bi/BiOCOOH/PVDF composite membrane materials were prepared using a simple two-step solvent thermal method and phase conversion method. The results showed that under the synergistic action of adsorption and photocatalysis , the photocatalytic degradation efficiency of Bi/BiOCOOH composite material and Bi/BiOCOOH/PVDF composite membrane material for ciprofloxacin (CIP) was much higher than that of BiOCOOH. The introduction of PVDF acted as a carrier, improved the adsorption of the catalytic material to CIP, and facilitated the effective collision of the photocatalytic active site and CIP. The experimental results and theoretical calculations confirmed that the combination of Bi and BiOCOOH effectively improved the light absorption capacity and photocatalytic performance. The reproducibility test revealed that the small amount of new composite catalyst for Bi/BiOCOOH/PVDF as a carrier was lost and that the Bi/BiOCOOH/PVDF catalyst still had high catalytic activity. In addition, the influence of water matrix factors, such as pH and anion, on the photocatalytic degradation experiment was investigated, which would provide some reference for the actual wastewater treatment of the composite catalyst. This study demonstrates a photocatalytic activation mechanism between metals and semiconductors and provides some basis for constructing catalysts for the synergistic and effective treatment of water pollution through a combined adsorption and photocatalysis process.
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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水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
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IF 3.927
Yuqi Cui,Xinyi Zhang,Huixuan Zhang,Qingfeng Cheng,Xiuwen Cheng
The application of semiconductor photocatalysts in wastewater treatment has received increasingly attentions because of its potential utilization of solar energy. In this study, a novel visible-light-driven (VLD) BiOCOOH/g-C 3 N 4 composite photocatalyst was successful synthesized by a facile hydrothermal method. Afterwards, physicochemical properties of the resulting samples were investigated through X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface areas, UV–visible diffuse reflectance spectroscopy (UV–vis DRS), transient photocurrent density, Mott-Schottky (M−S) and electrochemical impedance spectroscopy (EIS) measurement. Furthermore, the visible light photocatalytic (PC) performance was evaluated through the degradation of amido black 10B dye. All results indicated that the combination of g-C 3 N 4 and BiOCOOH could exhibited greatly visible light absorbance and photo-generated charge separation efficiency, thereby resulting in the enhanced PC performance of BiOCOOH/g-C 3 N 4 composite photocatalyst. The optimal Bi/C molar rate in BiOCOOH/g-C 3 N 4 composite was determined to be 1/1, and the corresponding photodegradation rate for amido black 10B was 0.01794 min −1 , which was nearly 2.19 and 5.73 folds higher than that of pure g-C3N4 and BiOCOOH. The possible mechanism of the PC reaction was also discussed in detail. Furthermore, BiOCOOH/g-C 3 N 4 composite photocatalyst performed good reusability and stability even after four recycle utilization.
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
SOLAR ENERGY
·
2025
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IF 6.6
Jiayuan Geng,Yipei Cao,Hongquan Fu,Jinming Chang,Hejun Gao,Fang Liao,Juan Zhang,Yunwen Liao
Photocatalytic nitrogen fixation, converting atmospheric nitrogen into ammonia under ambient conditions, offers a sustainable alternative to the Haber-Bosch process. Herein, the hydrothermal and solvothermal methods to prepare the heterojunction based on BiOCOOH nanosheets and BiOBr nanosheets (BiOCOOH/BiOBr) have been reported. The BiOBr nanosheets epitaxially grow along the nanosheets structure of BiOCOOH. The BiOCOOH/BiOBr heterojunction exhibit photogenerated electron–hole separation properties, which was ascribed from the suitable bandgap values for photocatalytic nitrogen fixation. The NH 3 yield of BiOCOOH/BiOBr heterojunction (63.7 μmol·g −1 ·h −1 ) was about 9 times higher than that of pure BiOCOOH with addition of 0.75 mL of methanol as a sacrifice solvent. Moreover, it is confirmed that the texture coefficient of the (102) BiOBr facet between BiOCOOH and BiOBr is positively correlated with photocatalytic performance, which verifies the growth law of BiOBr on BiOCOOH and explains the formation of the heterojunction from a new perspective. The oxygen vacancies from the (102) BiOBr facet can facilitate the adsorption of nitrogen molecules with a stable adsorption energy of 0.1 eV by density functional theory calculations. This study may offer new perspectives for the design of a series of photocatalytic nitrogen fixation catalysts, particularly in terms of crystal facet control and oxygen vacancy-enhanced nitrogen adsorption.
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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纳米技术
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物理化学
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 8
·1368-1380
·
IF 3.117
Hui Zhou,Kaleemullah Kalware,Ming Shen,Songtao Zhong,Yufeng Yao
A series of BiOCOOH and Bi/BiOCOOH heterojunction micro-/nanostructures with various morphologies have been successfully synthesized by a one-step hydrothermal process with the assistance of formamide. The morphology, structure and composition of the as-obtained samples and the effect of formamide were systematically characterized and investigated. The results reveal that formamide plays multiple roles in the synthesis of the BiOCOOH and Bi/BiOCOOH heterojunctions, which acts as the carbon and alkali source. Moreover, the formic acid abundantly provided by the hydrolysis of formamide serves as the reductant and structure-directing agent. The photocatalytic activities of all the catalysts were evaluated by the degradation of rhodamine B (RhB) and reduction of potassium dichromate (K2Cr2O7) under simulated sunlight irradiation. It is found that the photocatalytic activity is closely related to the morphology and composition of the photocatalyst. The well-defined 3D flower-like BiOCOOH prepared at 20 vol% formamide shows a higher photocatalytic activity than the other BiOCOOH samples, which could be attributed to its hierarchical nanostructure, larger specific surface area and stronger adsorption capacity. Meanwhile, the Bi/BiOCOOH heterojunction obtained at 60 vol% formamide shows the best photocatalytic performance due to the increased light absorbance capacity and more efficient separation and transfer of photogenerated carriers with the existence of in situ deposited metallic Bi. Trapping experiments reveal that h+ and ˙O2− are the main active species in the photodegradation process and a possible photocatalytic 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
CRYSTENGCOMM
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2011
·Vol. 13
·期 7
·2381-2390
·
IF 4.006
Jinyan Xiong,Gang Cheng,Zhong Lu,Jiale Tang,Xianglin Yu,Rong Chen
Different shaped bismuth oxide formate (BiOCOOH), including spherical-like, sponge-like, tremella-like, flower-like hierarchical nanostructures have been successfully synthesized through a facile and template-free solvothermal process in different solvents. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflection spectroscopy (DRS) and nitrogen adsorption. Based on the electron microscopy observations of the products obtained under different experimental conditions, a possible growth mechanism which involves Ostwald ripening and self-assembly process was proposed. It was found the solvent plays a crucial role in the formation of the BiOCOOH hierarchical nanostructures. The optical properties, Brunauer–Emmett–Teller (BET) surface areas and photocatalytic activities on the degradation of Rhodamine B (RhB) of the different BiOCOOH hierarchitectures were also evaluated. The results indicated that the synthesized sponge-like BiOCOOH hierarchical nanostructures possessed favorable recycling characteristics, and exhibited the highest photocatalytic activity compared with other BiOCOOH hierarchitectures, because of its largest surface area (30.28 m2 g−1) and large band gap (3.46 eV). This work not only provides new strategies for the controllable synthesis of other novel hierarchical materials, but also develops new promising photocatalysts for degrading organic pollutants and explores significant potential applications in environment pollution.
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
危险品化学品经营许可证（带存储）