JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Xiaojie Cheng,Jiahui Liao,Yue Xue,Qingquan Lin,Zhaomei Yang,Guilong Yan,Guangyong Zeng,Arijit Sengupta
Membrane separation technology is considered as one of the most promising wastewater treatment technologies. However, difficulties in thorough water purification and poor fouling resistance in practical applications are some of the major concerns associated to membrane-based water purification. In the present investigation, a combination of efficient and environmentally friendly photocatalysis technology has been adopted for the fabrication of a series of [email protected] multifunctional photocatalytic composite membranes by stacking MXene nanosheets and BiOCl-PPy photocatalytic nanoparticles on polyethersulfone (PES) substrates. The composite membranes with BiOCl-PPy nanoparticles exhibited excellent permeation performance with pure water (flux of 3680.2 L m −2 h −1 ). Moreover, the composite membranes achieved 99.9% of combined removal rate for three different dyes and 96% for antibiotic (Tetracycline Hydrochloride) by physical sieving and photocatalytic degradation. The self-cleaning mechanism of composite membranes maintained good long-term permeability and selectivity during the cyclic tests. Hence, the service life of the membrane under visible light irradiation has been significantly improved without any compromise on the membrane performance. The density functional theory (DFT) calculation has been utilized to understand the mechanism in enhancing the photocatalytic activity of the composite membrane.
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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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xingping Fu,Qianqian Chen,Ye Zhang,Feng Yu,Junjie Pan,Xiaobing Yang
The overuse of antibiotics, coupled with inadequate wastewater treatment, has led to widespread environmental contamination, posing significant risks to ecosystems and public health. In this study, a novel BiOCl/Bi 2 MoO 6 /MIL-125(Ti) heterojunction catalyst featuring a Z -scheme and II-type dual-functional junctions was prepared via a two-step solvothermal method and employed for the degradation of tetracycline (TC). The synthesized samples were thoroughly characterized by XRD, SEM, BET, TEM, and UV–vis spectroscopy. The results indicate that the incorporation of BiOCl and Bi 2 MoO 6 effectively tunes the band structure of MIL-125(Ti), enhancing its visible-light absorption. Moreover, the formation of the heterojunction interfaces significantly suppresses recombination of photogenerated charge carriers, thereby improving photocatalytic performance. Under visible-light irradiation, the BiOCl/Bi 2 MoO 6 /MIL-125(Ti) catalyst generates reactive radicals (·OH and ·O₂ − ), enabling efficient degradation of TC with a removal efficiency of 95.71 %. The synergistic effect of the Z -scheme and II-type heterojunctions plays a crucial role in the efficient photocatalytic degradation of TC. This study provides new insights into the degradation mechanisms of bifunctional heterojunctions and presents a promising strategy for designing high-performance photocatalysts for tetracycline degradation.
研究领域:
环境科学
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材料化学
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光催化
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环境污染治理
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纳米材料
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药物降解
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半导体异质结
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Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Xinyan Wang,Yuting Zhang,Jian Zhang,Chengpeng Shao,Jiaxing Yang,Yuning Zhang,Ruoyi Li,Zheng Xing
In this study, a Z-type heterojunction photocatalyst CoWO 4 /CS/BiOCl-10 was constructed by hydrothermal synthesis for the efficient removal of norfloxacin (NOR) contaminants in water. X-ray photoelectron spectroscopy (XPS) combined with Fourier transform infrared spectroscopy (FT-IR) confirmed that the hydroxyl group in the chitosan (CS) molecule was bonded with the oxygen atom on the surface of CoWO 4 through hydrogen bonding to form a directional charge transport channel, which greatly improved the photocatalytic degradation efficiency of CoWO 4 /CS/BiOCl-10, and the degradation rate was as high as 98.30 % within 90 min under 300 W xenon lamp irradiation. Optoelectronic measurements show that the interfacial potential difference drives electrons to migrate along the Z-path. Density functional theory (DFT) and liquid chromatography-mass spectrometry (LC-MS) were used to identify intermediates in the NOR degradation process, revealing the degradation pathway of NOR through piperazine ring cleavage and defluorination. The kinetics of NOR degradation intermediates were revealed using two-dimensional correlation spectroscopy (2DCOS) techniques. Rice seed germination experiments have shown that the degraded NOR solution is virtually non-toxic, greatly reducing the environmental impact. This study provides a new strategy for the development of efficient photocatalytic systems through the synergistic regulation mechanism of hydrogen bonding and heterojunction.
研究领域:
环境科学
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材料科学
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光催化
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水处理
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化学工程
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光谱学
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毒理学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2019
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IF 4.914
Zeqing Long,Guang Xian,Guangming Zhang,Tao Zhang,Xuemei Li
A BiOCl-Bi 12 O 17 Cl 2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method. The texture, structure, optical, and photocatalytic properties of the composite were characterized. The results showed that the composite had a sheet flower-like structure with a large specific surface area. Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs. The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination. The composite's reaction rate constant of removing rhodamine B (/ciprofloxacin) was approximately 8.14 (/4.94), 42.63 (/11.91) and 64.66 (/36.07) times that of Bi 12 O 17 Cl 2 , P25, and BiOCl, respectively. Furthermore, the composite showed a wide applicable pH range and excellent reusability. Mechanism analysis showed that photogenerated holes played a dominant role and ·O 2 − also contributed to photocatalytic degradation. In summary, this study presents a high-efficiency photocatalyst for wastewater treatment .
研究领域:
材料科学
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环境科学
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纳米技术
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化学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2020
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IF 2.65
Wei Yang,Xinyao Shan,Ying Chen,Yanhua Gao
In this paper, a novel heterojunction material was synthesized of C 3 N 4 via doping with π-deficient conjugated pyridine ring molecules (2,6-diaminopyridine) and BiOCl by ultrasound-assisted method. First, doping C 3 N 4 with 2,6-diaminopyridine can reduce the structural integrity and orderliness of C 3 N 4 , and reduce the number of structural fragments, Which makes C 3 N 4 have more reactive sites. And then BiOCl nanosheets were grown on the surface of the modified C 3 N 4 nanosheets to obtain a new heterojunction material composed of modified C 3 N 4 doped with π-deficient pyridine ring molecules and BiOCl by the co-precipitation method. At last, the degradation of methyl orange (MO) by BiOCl, C 3 N 4 , modified C 3 N 4 doped with 2,6-diaminopyridine, and a series of C 3 N 4 doped with 2,6-diaminopyridine and BiOCl composite heterojunction materials under visible light was studied. X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), ultraviolet visible diffuse reflection (UV–Vis DRS) and transient photocurrent densities, and electrochemical impedance spectroscopy (EIS) were used to analyze the structure, morphology, and photogenerated charge transfer characteristics of samples. The experimental results show that the new heterojunction composite materials has better photocatalytic activity compared with pure BiOCl, C 3 N 4 , and modified C 3 N 4 doped with 2,6-diaminopyridine. In addition, the degradation performance of methyl orange with different mass ratios of composite materials is also different. When the mass ratio of C 3 N 4 doped with 2,6-diaminopyridine to BiOCl is 1:2, The composite material exhibits the best photocatalytic performance, which may be related to the synergistic effect of the modified C 3 N 4 doped with 2,6-diaminopyridine and BiOCl. Based on the band structure and active species experiments, the reasons for the enhanced photocatalytic activity are discussed, and the possible degradation mechanisms are proposed. The research in this paper provides an effective new way to construct new heterojunction materials.
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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纳米技术
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高影响因子
Nanoscale
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2015
·Vol. 8
·期 25
·12715-12722
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IF 7.394
Yu Xu,Zhenzhi Shi,Ling'e Zhang,Eric Michael Bratsolias Brown,Aiguo Wu
Layered bismuth oxyhalide nanomaterials have received much more interest as promising photocatalysts because of their unique layered structures and high photocatalytic performance, which can be used as potential inorganic photosensitizers in tumor photodynamic therapy (PDT). In recent years, photocatalytic materials have been widely used in PDT and photothermal therapy (PTT) as inorganic photosensitizers. This investigation focuses on applying layered bismuth oxyhalide nanomaterials toward cancer PDT, an application that has never been reported so far. The results of our study indicate that the efficiency of UV-triggered PDT was highest when using BiOCl nanoplates followed by BiOCl nanosheets, and then TiO2. Of particular interest is the fact that layered BiOCl nanomaterials showed excellent PDT effects under low nanomaterial dose (20 μg mL−1) and low UV dose (2.2 mW cm−2 for 10 min) conditions, while TiO2 showed almost no therapeutic effect under the same parameters. BiOCl nanoplates and nanosheets have shown excellent performance and an extensive range of applications in PDT.
研究领域:
纳米技术
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癌症治疗
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光催化
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Congcong Wu,Minghui Fu,Wenbo Zhai,Yujing Tang,Changhao Men,Yi Yu,Hung-Ta Wang
Bismuth oxychlorides are emerging two-dimensional wide-bandgap semiconductors with exceptional potential for advanced photoelectric applications. Elastic strain engineering is a promising strategy to enhance their photoelectric performances. However, fundamental elastic properties of bismuth oxychlorides are largely unknown. In this work, atomic force microscopy based nanoindentations were employed to characterize sub 5 nm thick freestanding BiOCl and Bi3O4Cl circular membranes, and recorded elastic responses were analyzed using a nonlinear membrane model. Experimentally acquired Young’s moduli and breaking strains of BiOCl and Bi3O4Cl membranes indicate a Cl–Cl interfacial shear effect in epitaxially grown BiOCl and a process-induced defect effect in the phase-transformed Bi3O4Cl. Built atomistic models illustrated bond strain behaviors of structurally symmetric BiOCl and asymmetric Bi3O4Cl and enabled predictions of strain-mediated interlayer electric fields and electronic structures. These results provide fundamental insights into the unique nanomechanics of layered bismuth oxychlorides and show guidelines of elastic strain engineering to tailor photoelectric properties of BiOCl and Bi3O4Cl.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Qiulin Bi,Qi Li,Zhipeng Su,Rui Chen,Chengxiang Shi,Tiehong Chen
In recent years, scientists have been striving to produce highly efficient photocatalysts through green and efficient synthesis methods. In this work, at room temperature, ultrathin iodine-doped BiOCl nanosheets were synthesized by template-free precipitation method for the first time. The catalyst exhibited enhanced photocatalytic activity and good durability for the removal of RhB under simulated solar irradiation. Transmission electron microscopy showed that it consists of a large number of ultrathin nanosheets (1–4 layers). X-ray photoelectron spectroscopy confirmed that oxygen vacancies exist on the catalyst surface. The significant increase in the photocatalytic activity of ultrathin nanosheets can be attributed to the reduction of its longitudinal dimension and the existence of surface defects.
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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2021
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IF 5.316
Yanguang Zhang,Jing Tian,Detong Tian,Weibing Li,Zhenze Liu,Fenghui Tian,Yuyu Bu,Shaoping Kuang
In order to solve the problem of low efficiency of existing photocatalyst in wastewater treatment, BiOCl and Bi x In y OCl solid solution photocatalysts with different indium element content were prepared by one-step solvothermal method. The solid solution of indium element greatly affects the porous structure and specific surface area of BiOCl, and the specific surface area of BiInOCl-0.5 is 9.26 times that of BiOCl, which provides abundant active sites for photocatalytic reaction. Furthermore, after indium element solid solution, the conduction band and valence band potentials of BiOCl shift towards negative and positive, respectively, enhancing the redox capacity of the photogenerated electrons and holes. Thus, BiInOCl shows excellent photocatalytic performances for reduction of Cr(VI), degradation of norfloxacin, dyes and even industrial cotton pulp wastewater. This provides a possibility for the practical application of photocatalytic technology 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
RSC Advances
·
2016
·Vol. 6
·期 22
·18577-18582
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IF 3.289
Yichang Yu,Zhangjun Hu,Yalei Zhang,Hongwen Gao
The title composite was synthesized under facile conditions by hydrolysis and co-precipitation. Through comparative studies, it was found that the morphology, structure and properties were affected by hexadecyl trimethylammonium bromide (CTAB) doping. Although the surface area decreases from 53.5 to 7.5 m2 g−1, it was found that CTAB@BiOCl exhibits higher adsorption capacity than the isolated BiOCl, and still maintains good photocatalytic activity, which is a little worse than the isolated BiOCl has. This was caused by the lower content of BiOCl in CTAB@BiOCl, which is less than 70%. The studies show that, in high concentrations of dye-contaminated water, the composite exhibits strong adsorption capacities of 901 mg g−1 to Congo Red (CR) and 699 mg g−1 to Reactive Red 3 (X3B). In the low-concentration case, it is able to process photocatalysis of those dyes. In the recycling experiment, the CTAB@BiOCl composite was regenerated in situ. And CTAB in the composite was almost completely degraded after five cycles, resulting in the regenerated BiOCl. Subsequently, the surface area of the composite increases from 7.5 to 22.62 m2 g−1, and along with this the adsorption capacities to CR and X3B decrease obviously due to the absence of the CTAB component. In addition, the photocatalysis activity of the generated composite has been promoted to be similar to the isolated BiOCl.
研究领域:
环境科学
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材料化学
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光催化
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水处理
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DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
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IF 0.847
Li-Xin LI,Chen CHEN,Zi-Hao LI,Fei-Fei WANG,Yun LIU,Zhi-Guo YI
Bismuth oxychloride (BiOCl) square microplates were prepared via a facile hydrothermal method . The X-ray diffraction patterns of the samples reveal a tetragonal BiOCl phase, and the scanning electron microscopy images show plate-like structures with large lateral size of 3~6 μ m and thickness in the range of 100~300 nm. The effects of surfactant, reaction temperature and duration on the morphology of BiOCl powders are systematically investigated. The polar behavior of a BiOCl single-crystalline microplate is examined by using piezoresponse force microscopy evidenced over 80 pm displacement under 40 V bias voltage. In addition, the photoelectric performance of the BiOCl microplates is evaluated by using electrochemical workstation with three-electrode system, and large photocurrent densities (over 0.5 μ A/cm 2 ) and fast photoresponse (0.7~1.1 s) are detected by applying both 365 nm monochromatic light and sunlight illumination. The surface potential changes of BiOCl microplate under different light condition, characterized by in-situ Kelvin probe force microscopy , further verify the separation ability of the photo-induced charge carriers. These findings would be beneficial for further design photocatalytic and piezocatalytic materials.
研究领域:
材料科学
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光化学
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纳米技术
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电化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
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IF 11.4
Zhang Yan,Wenjian Kuang,Yu Lei,Wenxiao Zheng,Hengyi Fu,Han Li,Zhenchao Lei,Xin Yang,Shishu Zhu,Chunhua Feng
Mixed metal oxide (MMO) anodes are commonly used for electrochlorination of ammonium (NH4+) in wastewater treatment, but they suffer from low efficiency due to inadequate chlorine generation at low Cl– concentrations and sluggish reaction kinetics between free chlorine and NH4+ under acidic pH conditions. To address this challenge, we develop a straightforward wet chemistry approach to synthesize BiOCl-functionalized MMO electrodes using the MMO as an efficient Ohmic contact for electron transfer. Our study demonstrates that the BiOCl@MMO anode outperforms the pristine MMO anode, exhibiting higher free chlorine generation (24.6–60.0 mg Cl2 L–1), increased Faradaic efficiency (75.5 vs 31.0%), and improved rate constant of NH4+ oxidation (2.41 vs 0.76 mg L–1 min–1) at 50 mM Cl– concentration. Characterization techniques including electron paramagnetic resonance and in situ transient absorption spectra confirm the production of chlorine radicals (Cl• and Cl2•–) by the BiOCl/MMO anode. Laser flash photolysis reveals significantly higher apparent second-order rate constants ((4.3–4.9) × 106 M–1 s–1 at pH 2.0–4.0) for the reaction between NH4+ and Cl•, compared to the undetectable reaction between NH4+ and Cl2•–, as well as the slower reaction between NH4+ and free chlorine (102 M–1 s–1 at pH < 4.0) within the same pH range, emphasizing the significance of Cl• in enhancing NH4+ oxidation. Mechanistic studies provide compelling evidence of the capacity of BiOCl for Cl– adsorption, facilitating chlorine evolution and Cl• generation. Importantly, the BiOCl@MMO anode exhibits excellent long-term stability and high catalytic activity for NH4+-N removal in a real landfill leachate. These findings offer valuable insights into the rational design of electrodes to improve electrocatalytic NH4+ abatement, which holds great promise for wastewater treatment applications.
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高影响因子
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