GREEN CHEMISTRY
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2024
·Vol. 26
·期 4
·2290-2299
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IF 9.3
Peng Bai,Yicheng Zhao,Yongdan Li
Conventional photocatalytic CO2 reduction is usually combined with the oxidation of H2O or sacrificial agents, which faces problems such as low catalytic activity and inefficient atom economy. In this work, a photocatalytic CO2 reduction and selective styrene oxidation synergetic system is developed with an NH4Cl-modified g-C3N4/BiOBr composite photocatalyst. The interfacial heterostructure promotes the formation of surface amino groups and oxygen vacancies, which facilitates the adsorption and chemical reduction of CO2. The heterostructure also improves the separation of photogenerated electron–hole pairs and enhances the photocatalytic activity. The simultaneous consumption of electrons and holes is beneficial for both CO2 reduction and styrene oxidation processes. Meanwhile, the oxygen atoms removed during CO2 reduction are utilized efficiently for styrene oxidation in this synergistic system, and thus the atom economy is improved significantly. The generation rates of CO, CH4, benzaldehyde and styrene oxide are 802, 8, 684 and 139 μmol g−1 h−1, respectively. This study provides a novel strategy for designing a green photocatalytic CO2 reduction 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
Molecular Catalysis
·
2017
·
IF 0
Li Wang,Lei Sun,Zebin Yu,Yanping Hou,Zhenbo Peng,Fei Yang,Ying Chen,Jun Huang
The Fe 3 O 4 @SiO 2 -BiOBr (FSB) magnetic composite was prepared and introduced into the dielectric barrier discharge (DBD) system as a heterogeneous Fenton-like photocatalyst for synergistic degradation of perfluorooctanoic acid (PFOA). The FSB was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, energy dispersive X-ray spectroscopy and scanning electron microscope. Characterization results demonstrated that BiOBr was successfully coated on Fe 3 O 4 @SiO 2 , forming FSB, and it exhibited good UV & visible response. The presence of FSB accelerated PFOA degradation: PFOA removal efficiency and total organic carbon removal from DBD-FSB system increased from 73.5% to 92.9% and 28.9% to 62.5%, respectively, within 60 min under reaction conditions of 20 mg L −1 PFOA, initial pH 4.28, 100 mg L −1 FSB and 22 kV peak voltage, as compared with DBD system. Accordingly, defluorination efficiency of PFOA and energy efficiency increased from 21% to 32.8% and 46.39 mg kW −1 h −1 to 72.47 mg kW −1 h −1 , respectively. The synergetic mechanism was attributed to the combination of active species such as OH, H 2 O 2 , O 3 , directly generated from the DBD plasma and a great amount of OH generated from Fenton-like reaction initiated by FSB photocatalyst under light irradiation emitted during discharge. The OH and photogenerated holes played essential roles in the mineralization process. Based on the identified intermediates, possible degradation pathways of PFOA in DBD-FSB system were proposed, and PFOA degradation mainly occurred via the pathway of perfluoroalkyl radical pathway.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jia Song,Yunfei Ma,Qitao Zhang,Chaohua Zhang,Xuelian Wu
The photocatalytic oxygen evolution of bismuth oxybromide (BiOBr) is greatly hindered by its low visible-light response and high electron–hole recombination. Nonmetal doping can effectively alleviate these issues, leading to improvement in photocatalytic performance. Herein, Bi2Te3 was introduced as both the Te doping source and the morphology-control template to improve the photocatalytic performance of BiOBr. Appropriate amounts of Te are critical to maintain the ultrathin plate-like structure of BiOBr, whereas excessive Te results in the formation of a flower-like architecture. Oxygen evolution activity disclosed that a plate-like structure is essential for realizing higher performance owing to sufficient light utilization and efficient charge separation. An optimal oxygen evolution rate of 368.0 μmol h–1 g–1 was achieved for the Te-doped sample, which is 2.3-fold as that of the undoped BiOBr (158.9 μmol h–1 g–1). Theoretical calculations demonstrated that Te doping can induce impurity levels above the valence band of BiOBr, which slightly narrowed the band gap and strengthened the light absorption in the range of 400–800 nm. More importantly, Te dopants could act as shallow traps for confining the excited electrons, thus prolonging the carrier lifetime. This work provides a novel strategy to prepare highly efficient photocatalysts by simultaneously realizing morphology manipulation and nonmetal doping.
研究领域:
材料科学
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化学
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光催化
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 24
·18542-18550
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IF 2.019
Wu Huating,Ding Xingeng,Li Wenqi,Ren Chunrong,Yang Hui
In this study, a magnetic Fe 3 O 4 /SiO 2 /BiOBr composite photocatalyst was controllably synthesized a PVP-assisted solvothermal method. The Fe 3 O 4 /SiO 2 /BiOBr composites are composed of many three-dimensional (3D) flower-like BiOBr microspheres loaded with many spherical Fe 3 O 4 particles. The formation mechanism and effect of PVP’s concentration on the products were investigated and proposed. Experimental results showed that PVP might act as a potential crystal plane inhibitor in the system as well as the stabilizer on the surface of BiOBr nanoplates. The Fe 3 O 4 /SiO 2 /BiOBr displayed high photocatalytic activity for the degradation of RhB under visible light irradiation, after which it can be easily recovered by applying an external magnetic field. Moreover, the as-prepared photocatalyst exhibited excellent stability and reusability in the cycled experiments.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Jinhong Bi,Zhangtong Zhang,Jinjin Tian,Guocheng Huang
Tetracycline (TC) antibiotics, extensively utilized in livestock farming and aquaculture, pose significant environmental challenges. Photocatalysis, leveraging renewable sunlight and reusable photocatalysts, offers a promising avenue for mitigating TC pollution. However, identifying robust photocatalysts remains a formidable challenge. This study introduces a novel hollow-flower-ball-like nanoheterojunction composed of a nitrogen-rich covalent organic framework (N-COF) coupled with BiOBr (BOB), a semiconductor with a higher Fermi level. The synthesized N-COF/BOB S-scheme nanoheterojunction features an expanded contact interface, strengthened chemical bonding, and unique band topologies. The N-COF/BOB composites showcased exceptional TC degradation performance, achieving an 81.2% removal of 60 mg/L TC within 2 h, markedly surpassing the individual efficiencies of N-COF and BOB by factors of 3.80 and 5.96, respectively. Furthermore, the total organic carbon (TOC) removal efficiency highlights a superior mineralization capacity in the N-COF/BOB composite compared to the individual components, N-COF and BOB. The toxicity assessment revealed that the degradation intermediates possess diminished environmental toxicity. This enhanced performance is ascribed to the robust S-scheme nanoheterojunction structure, which promotes efficient photoinduced electron transfer from BOB to N-COF. This process also augments the separation of photogenerated charge carriers, resulting in an increased yield of superoxide radicals (∙O 2 − ) and hydroxyl radicals (∙OH). These reactive species significantly contribute to the degradation and mineralization of TC. Consequently, this study introduces a sustainable approach for addressing emerging antibiotic contaminants, employing COF-based photocatalysts.
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
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2022
·Vol. 128
·期 5
·1-13
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IF 2.983
Hu Hanmei,Wang Tao,Peng Lulu,Ling Xiaohui,He Yunyun,Sun Mei,Yang Mingdi,Deng Chonghai
In this study, a novel CdS/BiOBr heterojunction comprising CdS quantum dots (QDs) decorated on BiOBr nanoflakes (NFs) was successfully synthesized by a facile microwave-assisted aqueous chemical synthesis technology. The crystal structure, chemical composition, and optical and electric properties were characterized by various techniques. The results demonstrated that cubic CdS QDs are planted uniformly on {001}-faced exposed tetragonal BiOBr NFs with about 30 nm thicknesses. The formation mechanism for CdS/BiOBr nanostructure was proposed. The photocatalytic performance of CdS/BiOBr heterojunction was greatly enhanced by the decomposition of organic pollutant under visible light irradiation. In particular, sample CB-3 exhibited the best photocatalytic activity for the degradation of malachite green, the fastest pseudo-first-order kinetic rate constant of which reached 0.125 min −1 , 4.4, 22.6, and 3.2 times higher than that of BiOBr, CdS and the physical mixture, respectively. The direct Z-scheme photocatalytic mechanism for CdS/BiOBr heterojunction could be attributed to the perfect band matching and the efficient charge carrier separation and transfer. Furthermore, the highly efficient photocatalytic performance for the degradation of Congo red (CR) and methyl red (MR) suggests a promising application in industrial wastewater treatment.
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
CARBON
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2024
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IF 10.5
Miao-Miao Chen,Yuan Liu,Shuaiqi Zhao,Jun Jiang,Qi Zhang,Peiwu Li,Xiaoqian Tang
Semiconductor-conductor-semiconductor (SCS) heterojunctions with cascade-type energy-level configurations hold great promise in improving the photoelectric conversion efficiency for photoelectrochemical (PEC) sensing. However, the existing SCS heterostructures were restricted by the incidental Coulomb blockade effect, high cost and the complicated preparation procedure. Hence, we induced methylamine bromide perovskite quantum dots-decorated carbon nanospheres (PQDs@CNSs) ensemble to boost the photoelectric activity of bismuth oxybromide (BiOBr) by creating indirect SCS Z-scheme heterojunctions. PQDs@CNSs@BiOBr ternary composites demonstrated substantially higher photocurrent response compared to individual PQDs@CNSs or BiOBr. Moreover, the stability of PQDs materials was greatly promoted through this design. Further combing with immune recognition, highly selective and ultra-sensitive quantitative detection of a kind of mycotoxin, deoxynivalenol (DON) as a food contaminant, was realized. The detection of limit was calculated to be 34.3 pg/mL. Satisfactory recoveries of DON in corn, as well as wheat samples, indicated the practicability of the as-proposed PEC sensors. This facile approach may provide new ideas for the preparation of carbon-based photoactivity semiconductors with desired PEC sensing performance in food safety field.
研究领域:
食品安全
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材料科学
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分析化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Runren Jiang,Guanghua Lu,Tianjian Dang,Min Wang,Jianchao Liu,Zhenhua Yan,Haijiao Xie
The difficult separation of products after photocatalytic degradation of microplastics (MPs) limits the in-depth analysis of the MPs fragmentation process and degradation mechanism, and there are no studies about the photocatalytic degradation of functional groups modified MPs. In this work, we synthesized a “dissolvable” BiOBr-OH semiconductor-organic framework (SOF) to degrade polystyrene (PS) MPs modified by different functional groups, including –OH, –NH 2 , -SO 3 H, –COOH and -epoxy. First, a series of characterization confirmed that small molecules were intercalated into BiOBr layers to construct BiOBr-OH SOF. The BiOB-OH SOF system has significantly enhanced the photocatalytic degradation performance of microplastics, and BiOB-OH-0.75 has the strongest catalytic performance. The photocatalytic degradation performance of different functional groups modified PS-MPs differed significantly, with the weight loss order being -epoxy > –NH 2 > –OH > –COOH > -SO 3 H. After dissolving the catalyst, clean nano plastic particles were obtained after degradation, and it was found that six types of PS-MPs exhibited three different types of fragmentation processes. The surface potential of and fragmentation mode of different PS-MPs dominated the adsorption and photocatalytic degradation of BiOBr-OH SOF. The degradation products of PS-MPs are mainly composed of styrene and functional group-modified monomer molecules and multimolecular complexes. In addition, by analyzing the toxicity of the degradation products of microplastics, it was found that solid products were the main reason for their enhanced toxicity. Finally, based on the photoelectrochemical characterization and free radical analysis, the mechanism of photocatalytic degradation of different functional groups modified PS-MPs by BiOBr-OH SOF was proposed.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
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IF 5.518
Rui Zhang,Ziyin Chen,Yu Li,Chen Zhao,Lu Cai,Junrong Yu,Ze Yang,Jiacheng Jiang
The unique properties of MOFs make them the best candidates for catalytic and photocatalytic applications. In this research, the NH 2 -UiO-66 material was prepared by solvothermal method , and different content of NH 2 -UiO-66 was added before the composite growth of Bi 2 S 3 and BiOBr nanomaterials to obtain the NH 2 -UiO-66/BiOBr/Bi 2 S 3 ternary composite material. In order to investigate the relationship between the structure and properties of the catalyst, XRD , FT-IR, SEM , HRTEM , UV–vis DRS, XPS and other characterization technologies were used to analyze the structure, morphology, optical properties of the samples, showing that NH 2 -UiO-66/BiOBr/Bi 2 S 3 have been successfully synthesized. Their photocatalytic performance was evaluated based on the photocatalytic degradation of tetracycline hydrochloride and rhodamine B under visible light . The results show that 2% NH 2 -UiO-66/BiOBr/Bi 2 S 3 has better photocatalytic activity than other materials. Moreover, NH 2 -UiO-66/BiOBr/Bi 2 S 3 also demonstrated good photocatalytic reusability and stability. The formation of Bi 2 S 3 and BiOBr heterojunctions and the introduction of NH 2 -UiO-66 with more active sites increase the carrier performance and separation efficiency. Then the valence band and conduction band values of the semiconductor material are calculated through the M-S curve, combined with the forbidden bandwidth deduced by UV–vis DRS and the experimental results of radical trapping, a double Z-type electron transfer mechanism suitable for this system is inferred. Finally, taking RhB as an example, the degradation path of dye pollutants was studied.
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
MOLECULES
·
2024
·Vol. 29
·期 13
·3185
·
IF 4.2
Li Lin,Si Xiao,Chuxuan Wang,Manhong Huang,Ling Xu,Yi Huang
The development of superlyophobic materials in liquid systems, enabling synchronous oil/water separation and dye removal from water, is highly desirable. In this study, we employed a novel superwetting array-like BiOBr nanosheets anchored on waste rock wool (RW) fibers through a simple neutralization alcoholysis method. The resulting BiOBr/RW fibers exhibited superoleophilic and superhydrophilic properties in air but demonstrated underwater superoleophobic and underoil superhydrophobic characteristics. Utilizing its dual superlyophobicity, the fiber layer demonstrated high separation efficiencies and flux velocity for oil/water mixtures by prewetting under a gravity-driven mechanism. Additionally, the novel BiOBr/RW fibers also exhibited excellent dual superlyophobicity and effective separation for immiscible oil/oil systems. Furthermore, the BiOBr/RW fibers could serve as a filter to continuously separate oil/water mixtures with high flux velocity and removal rates (>93.9%) for water-soluble dye rhodamine B (RhB) simultaneously by directly activating peroxymonosulfate (PMS) in cyclic experiments. More importantly, the mechanism of simultaneous oil/water separation and RhB degradation was proposed based on the reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis. Considering the simple modified process and the waste RW as raw material, this work may open up innovative, economical, and environmentally friendly avenues for the effective treatment of wastewater contaminated with oil and water-soluble pollutants.
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
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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产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Huiqin Chang,Qiying Zhu,Yuyin Wu,Anqi Liu,Meng Jiang,Chuang Li,Huiting Li,Ling Kong,Zhiwei Chen,Feng Sang
Prostate cancer is one of the most common cancers in the world, and its early diagnosis can effectively reduce mortality. A new label-free photoelectrochemical (PEC) immunosensor on the basis of Bi 2 WO 6 /BiOBr nanocomposite materials has been successfully prepared for the test of prostate-specific antigen (PSA) in human serum in this work. The Ag 2 S-sensitized Bi 2 WO 6 /BiOBr heterojunction was used as a photosensitive material, which effectively improved the photocurrent response. On Bi 2 WO 6 /BiOBr surface, dopamine immobilized PSA antibody by self-polymerizing to form polydopamine membrane. Antigen and antibody are specifically combined to achieve quantitative detection of PSA according to the current changes at different concentrations of antigen. Under the optimal experimental conditions, the PEC immunosensor has an ideal linear relationship between 1 pg/mL - 50 ng/mL, and the detection limit is 0.084 pg/mL. In addition, the prepared immunosensor has good stability, reproducibility and selectivity, providing a new method for the detection of PSA in actual sample analysis.
研究领域:
医学诊断
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生物传感
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癌症研究
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）