JOURNAL OF NANOBIOTECHNOLOGY
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2019
·Vol. 17
·期 1
·1-14
·
IF 5.345
Gasmalla Hind Baballa,Lu Xiaoquan,Shinger Mahgoub Ibrahim,Ni Lubin,Chishti Aadil Nabi,Diao Guowang
Background Iron oxide nanocomposites have received a great attention for their application in various fields like physics, medicine, biology, and material science etc., due to their unique properties, such as magnetism, electrical properties, small size, biocompatibility and low toxicity. Methods Fe 3 O 4 /Ag 3 PO 4 @WO 3 nanocomposites with different weight percent of Ag 3 PO 4 were successfully prepared through fabricated Ag 3 PO 4 /Fe 3 O 4 with WO 3 via in situ fabrication method, electrospinning involved precursor solution preparation and spinning to enhance photocatalyst performance under simulated sunlight for the degradation of methylene blue (MB) and antibacterial activity against Staphylococcus aureus ( S. aureus ). Results The photocatalytic degradation of methylene blue (MB) under simulated light irradiation indicated that the nanocomposite with 0.25 mg of Ag 3 PO 4 has the best activity. An additional advantage of these photocatalysts is magnetic recoverability, using external magnetic field and photocatalytic stability of the nanocomposites was evaluated for three cycles. In addition, using different scavengers, holes (h + ) and superoxide radical (O
·−) 2
radicals and hydroxide radical ( · OH) were identified the main oxidative species in the degradation reaction of methylene blue. Conclusions The results reveal that Fe 3 O 4 /Ag 3 PO 4 @WO 3 -0.25 nanocomposites have photocatalytic and antibacterial activity against S. aureus. The photocatalyst and mechanism based on the enhancement of electron transfer processes between Ag 3 PO 4 and WO 3 nanoparticles.
研究领域:
材料科学
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环境科学
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微生物学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Chaorong Chen,Hongyan Zeng,Moyu Yi,Gaofei Xiao,Sheng Xu,Shigen Shen,Bo Feng
The photocatalytic performance of Ag 3 PO 4 is severely restricted by the photocorrosion and high charge carrier recombination rate. In order to overcome these defects, a novel Ag 3 PO 4 /calcined Zn-Al layered double hydroxides (APMO) heterostructure photocatalyst was fabricated via in-situ growth of Ag 3 PO 4 particles on the surface of calcined Zn-Al layered double hydroxides (MMO). The crystal structures, morphologies, optical and photoelectrochemical properties of the as-synthesized samples were characterized using various techniques, and its photocatalytic activity for tetracycline (TC) degradation was evaluated under simulated solar light irradiation. Obviously, all the APMO composites demonstrated much higher photocatalytic performances for TC degradation than pure Ag 3 PO 4 . Especially, the APMO70 showed the highest photocatalytic activity, which was almost about 49.3 times as high as that of pure Ag 3 PO 4 , and the degradation efficiency was still above 89% after 5 cycles. The improved photocatalytic performance and stability of APMO were ascribed to the efficient charge transfer and strong interfacial contact between Ag 3 PO 4 and MMO. The possible photocatalytic mechanisms involving the charge transfer pathway and reactive species generation during the process of TC degradation were also discussed. Finally, the aquatic toxicity of TC was assessed using Chlorella vulgaris ( C. vulgaris ) as an ecological indicator, and the result suggested that the as-prepared APMO composite can effectively diminish the aquatic toxicity of TC.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Weiping Zhang,Guiying Li,Wanjun Wang,Yaxin Qin,Taicheng An,Xinyan Xiao,Wonyong Choi
A chemically modified Ag 3 PO 4 @MS 2 (M = Mo, W)/rGO composite was firstly synthesized via a liquid-exfoliation solvothermal method. The structure, morphology, optical properties and composition were characterized by X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and X-ray photoelectron spectroscopy, respectively. The characterization results indicated that compact structure could be obtained by using this typical method due to in-situ chemical modification, which could also control the sizes of Ag 3 PO 4 nano-sheets by adding MS 2 /rGO hybrids. More importantly, the resultant Ag 3 PO 4 @MS 2 /rGO composite exhibited higher photocatalytic activity and stability toward the degradation of 4-nitrophenol than pure Ag 3 PO 4 under sunlight irradiation. The stable structure of Ag 3 PO 4 @MS 2 /rGO was closely related with Z-scheme electronic structure and electrical conductivity of MS 2 /rGO hybrids, leading to a higher consumption and transfer of photogenerated electrons. However, by controlling the amounts of MS 2 /rGO hybrids, more stable but lower photocatalytic activity composites could be obtained. Further analysis found that the holes and O 2 − were the main reactive species involved in the photocatalytic degradation of 4-nitrophenol. In addition, possible photocatalytic degradation pathways of 4-nitrophenol were also proposed based on the identified intermediates. The findings of this work may provide a new method to design efficient composites for photocatalytic degradation of organic 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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Qingyong Li,Fulei Wang,Yuxiang Hua,Yuting Luo,Xiaoheng Liu,Guorong Duan,Xujie Yang
A series of novel visible-light-driven Ag/Ag 3 PO 4 /WO 3 (AAPW) Z-scheme heterostructures were fabricated using a facile deposition-precipitation method followed by photo-reduction without adding any surfactant . To explore more deeply about the photocatalytic activity of AAPW nanocomposites under neutral and strongly acidic/alkaline conditions, we investigated their photocatalytic rhodamine B (RhB) efficiency at different pH value that was controlled by adding HNO 3 or NaOH aqueous solution. It was found that as-prepared AAPW photocatalysts showed enhanced photocatalytic RhB efficiency under neutral and even strongly acidic/alkaline environment. The process of charge carrier separation and transfer in the AAPW nanocomposites and Z-scheme mechanism for RhB degradation were described in sufficient detail based on systematical characterizations and measurements. The silver particles introduced to build AAPW Z-scheme structure should contribute to more efficient charge separation, resulting in enhanced photocurrent response and photocatalytic activity . We expect that this work will provide systematic study concerning Z-scheme Ag/Ag 3 PO 4 /WO 3 structure, and fulfill the research about photodegrade activity of catalyst under strongly acidic/alkaline conditions.
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 COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Qing Wang,Jiamin Wei,Shiye Xu,Jiajie Li,Tinghai Yang,Guangyu He,Haiqun Chen
Intrinsic activity and accessibility of active sites are two fundamental descriptors for enhancing Ag 3 PO 4 -based photocatalysts. However, simultaneously optimizing both parameters poses a significant challenge for Ag 3 PO 4 -based heterojunction photocatalysts prepared by a conventional ion exchange precipitation method. This study demonstrates that Ag 3 PO 4 /In 2 O 3 Z-scheme heterojunction prepared by pre-fabrication and post calcination method not only increases the electron transfer rate (boosts intrinsic activity) by introducing oxygen vacancies and constructing heterojunctions, but also obtains highly dispersed Ag 3 PO 4 particles on the surface of hollow tubular In 2 O 3 after calcination treatment (enhances accessibility of active sites). Remarkably, the optimized Ag 3 PO 4 /In 2 O 3 -2 Z-scheme heterojunction demonstrates an exceptional catalytic efficiency (0.113 min −1 ) in facilitating the photocatalytic decomposition of tetracycline (TC), significantly outperforming the catalyst synthesized via the conventional ion exchange precipitation technique (0.036 min −1 ). In addition, three-dimensional excitation emission matrix fluorescence spectroscopy, high-resolution mass spectrometry, photoelectrochemical testing, free radical capture experiments, and electron spin resonance techniques were conducted to elucidate the possible degradation pathways for TC. Importantly, a systematic investigation was conducted to assess the practical application potential of Ag 3 PO 4 /In 2 O 3 -2 composites, encompassing the degradation activity in actual wastewater, different dyes and antibiotics, as well as the calculation of toxicity of degradation products and exploration of antibacterial activity. This study provides a “two-in-one” strategy from the perspective of synchronously enhancing the intrinsic activity of catalysts and the accessibility of active sites.
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhenfei Yang,Xinnian Xia,Luhua Shao,Longlu wang,Yutang Liu
Herein, Ag 3 PO 4 /mixed-valence MIL-88A(Fe) [AMM] Z-scheme heterojunctions with an in-situ-generated photo–Fenton process were successfully constructed. The optimized AMM-20 heterojunctions show the maximum rate of photocatalytic TC degradation, which is 2.5 and 6.6 times of pristine Ag 3 PO 4 and MIL-88A(Fe). The electronic and band structures of Ag 3 PO 4 , MIL-88A(Fe), m-MIL-88A(Fe) and AMM heterojunctions were deeply investigated by both experimental and theoretical simulation. The Z-scheme transfer pathway greatly accelerates the transfer rate of charge carriers and effectively inhibits the photocorrosion, leading to the improvement of photocatalytic activity and photostability. Moreover, the adjustment of the Fe II /Fe III ratio of mixed-valence MIL-88A(Fe) further enhances the photocatalytic activity of the hybrid photocatalysts, benefiting from the promotion of the efficiency of the in-situ-generated photo-Fenton process. The Z-scheme transfer route coupling with an in-situ-generated photo–Fenton process was verified by the free radical trapping experiment, in-situ XPS measurement, in-situ ESR measurement, and coumarin fluorescence analysis. The degradation pathways of TC were determined through LC-MS analysis and theoretical calculation. Furthermore, the toxicity of intermediates was evaluated by QSAR prediction.
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
WATER SCIENCE AND TECHNOLOGY
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2022
·Vol. 85
·期 3
·887-899
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IF 2.43
Duan Mengtian,Wu Daoxin,Ji Yu,Tong Haixia
The Cs 3 PW 12 O 40 /Ag 3 PO 4 (CsPW/Ag 3 PO 4 ) heterojunction photocatalyst in this study was prepared using a simple chemical precipitation method. Spherical CsPW particles were successfully deposited on Ag 3 PO 4 nanocrystals, all the as-prepared samples are characterized by X-ray diffraction pattern (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV visible spectroscopy (UV-Vis), and X-ray photoelectron spectroscopy (XPS). The catalyst activity in relation to rhodamine B (RhB) degradation was evaluated under visible light ( λ > 420 nm). The CsPW/Ag 3 PO 4 heterojunction photocatalyst can effectively degrade RhB. The Z-scheme 3% CsPW/Ag 3 PO 4 heterojunction photocatalyst has a higher photocatalytic ability compared with the single-component photocatalyst CsPW or Ag 3 PO 4 . The comparatively high photocatalytic performance can be attributed to the high matching of the energy band position and close interface contact, suggesting an enhanced separation efficiency of the photoinduced carriers of the CsPW/Ag 3 PO 4 heterojunction photocatalyst. The reactive species trapping experiments demonstrated photogenerated holes (h + ) and superoxide radicals to be the main active components of photocatalytic degradation. A possible photocatalytic mechanism is subsequently proposed. A Z-scheme heterojunction photocatalyst CsPW/Ag 3 PO 4 has been synthesized and it possesses excellent stability. The CsPW/Ag 3 PO 4 photocatalysts exhibited apparent visible-light absorption and weakened recombination of photogenerated electron/hole pairs. A possible photocatalytic reaction mechanism has been proposed.
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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纳米技术
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光催化
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Xiaotong Mu,Lihua Chen,Nannan Qu,Min Yin,Shang Wu,Qimeige Hasi,Chaohu Xiao
Solar-powered interface evaporation is considered a promising technology to obtain freshwater from non-potable water by using sustainable solar energy. However, research on combining the photocatalytic effect with solar interfacial evaporation technology to go for photothermal conversion materials with full solar spectrum utilization for photothermal and photodegradation capabilities is still scarce. Due to the unique optical properties of MXene, a novel MXene/Ag 3 PO 4 -based membrane with synergistic photothermal and photocatalytic effects was developed from the perspective of practical applications such as water purification, photodegradation of organic dyes and antibacterial properties. In this paper, polyvinylidene fluoride (PVDF) and carbon black (CB) were used as the substrate, calcium carbonate (CaCO 3 ) and hydrochloric acid (HCl) were selected as the pore-forming agent for hydrophilic modification, and MXene/Ag 3 PO 4 serves as the photocatalyst. The prepared composite polyvinylidene fluoride membrane (PCC-MXene/Ag 3 PO 4 ) with Schottky junction, possesses a rich pore structure, abundant water molecule transport channels, high light absorption ability, and low thermal conductivity, which lead to a good performance in solar interface evaporation, photodegradation and antibacterial. The superhydrophobicity and floatability of the nanosponges in water enable them to continuously pump water, which greatly promotes the dissolution of salt accumulation. With the help of porous nanosponges, PCC-MXene/Ag 3 PO 4 exhibits excellent evaporation stability and salt resistance under 1 kW m −2 solar irradiation, as well as photodegradation of organic dyes. In addition, the PCC-MXene/Ag 3 PO 4 membrane has the properties of self-buoyancy, electrical conductivity, and superior flexibility. Therefore, considering the simple preparation method and fine performances, the PCC-MXene/Ag 3 PO 4 mixed membrane has great application potential in the study of interface evaporation, photodegradation of organic dyes, and antibacterial properties.
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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水处理
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光催化
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能量转换
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Kexin Li,Yun Zhong,Shenglian Luo,Wenying Deng
In this article, a series of powder and modular H 3 PW 12 O 40 /Ag 3 PO 4 composites were successfully fabricated for the first time by simple strategies. The as-prepared powder and modular H 3 PW 12 O 40 /Ag 3 PO 4 composites showed the unique photocatalytic characteristic of ultra-fast degradation of organic pollutants in water under visible-light. For the best powder H 3 PW 12 O 40 /Ag 3 PO 4 , 4-fluorophenol (4-FP) and methyl orange (MO) in water can be completely degraded and rhodamine B (RB) in water can be degraded to 78 % after 360 s of visible-light irradiation. For the best modular H 3 PW 12 O 40 /Ag 3 PO 4 , 4-FP, MO, and RB can be degraded to 84 %, 72 %, and 92 % after 30 min of visible-light irradiation. The reasons for this unique photocatalytic characteristic of as-prepared powder and modular H 3 PW 12 O 40 /Ag 3 PO 4 composites were systematically studied by various modern characterization strategies. The "four-step" strategy was proposed in order to realize the practical engineering application of as-prepared powder and modular H 3 PW 12 O 40 /Ag 3 PO 4 composites in photocatalytic organic wastewater treatment technology.
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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DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Yu Yao,Qianhong Shen,Qifeng Chen,Yanyan He,Libei Jiang,Jie Liu,Yue Li,Xudan Cao,Hui Yang
A silver phosphate (Ag3PO4)/silver (Ag)/silver halide (AgX, X = Cl, Br, or I) ternary composite photocatalysts were prepared by loading Ag nanoparticles on Ag3PO4 tetrapods followed with in situ halogenation. The interface charge transfer behavior in the Ag3PO4/Ag/AgX nanocomposite was studied, and the photocatalytic performance was also evaluated. The results show that the Ag3PO4/Ag/AgI photocatalyst exhibits higher photocatalytic activity than the other two photocatalysts due to the more matched band structure between AgI and Ag3PO4. An internal electric field (IEF) from Ag3PO4 to AgI is formed at the heterogeneous interface, so the photogenerated electrons at the conduction band of AgI can rapidly transfer to the valence band of Ag3PO4 and recombine with photogenerated holes, which is consistent with the S-scheme charge transfer mechanism. Meanwhile, the photogenerated electrons left at the conduction band of Ag3PO4 can transfer to Ag nanoparticles due to the Schottky junction and react with oxygen to produce •O2–, which is proved to be the main active species in the photocatalytic procedure. This tandem junction modulated between the S-scheme heterojunction and Schottky junction promotes the efficient separation of photogenerated carriers, thus significantly increasing the average PL lifetime of electrons by 2.95 times. Therefore, the Ag3PO4/Ag/AgI photocatalyst exhibits excellent photocatalytic activity for the degradation of methylene blue and norfloxacin. The seven consecutive cyclic tests prove the good stability of the photocatalyst, thus showing the application potential in the field of sewage treatment.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 14
·10147-10159
·
IF 2.993
Wu Xiao-Qiong,Shen Jiang-Shan,Zhao Fei,Shao Zai-Dong,Zhong Lu-Bin,Zheng Yu-Ming
Semiconductor photocatalysis is a promising technology for removing contaminants from water. Particularly, visible-light photocatalysis has attracted much attention because of its potential to utilize solar energy. However, nano-sized visible-light-driven photocatalysts easily aggregate during water treatment. Besides, it is difficult to recycle them from treated systems. Therefore, it is of great importance to develop visible-light-responsive immobilized photocatalysts with high activity. In this work, MWCNTs/Ag 3 PO 4 /polyacrylonitrile (PAN) ternary composite fiber membranes (TCFMs) with good photocatalytic performance were fabricated by electrospinning technique combined with in situ Ag 3 PO 4 forming reaction. Due to the addition of MWCNTs, the band gap of MWCNTs/Ag 3 PO 4 /PAN TCFMs became narrower than that of Ag 3 PO 4 /PAN binary composite fiber membranes (BCFMs), which made MWCNTs/Ag 3 PO 4 /PAN TCFMs be able to use light at longer wavelengths. Compared with Ag 3 PO 4 /PAN BCFMs, the as-prepared MWCNTs/Ag 3 PO 4 /PAN TCFMs showed enhanced photocatalytic activity and stability for degrading rhodamine B (RhB) in batch processing systems, which mainly ascribed to fast electron transfer from Ag 3 PO 4 to MWCNTs and the resulting high electron–hole (e − –h + ) separation efficiency. Radical trapping experiments revealed that holes (h + ) and superoxide radicals ( · O 2 − ) played primary roles in RhB degradation. In addition, the flexible MWCNTs/Ag 3 PO 4 /PAN TCFMs also showed potential practical application in the continuous wastewater treatment by a suitable photocatalytic membrane reactor. This work provides a facile approach to prepare flexible supported photocatalytic membrane with visible-light response, high activity and good stability.
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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产品关联
DOI
高影响因子
ACS Omega
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2024
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IF 3.7
Yihang Yue,Lin Han,Bo Ding,Yanxi Yang,Xiaoju Yue,Shifeng Wang,Qingguo Song,Chun Du
The escalating problem of water pollution has become an urgent concern, as it significantly undermines people’s quality of life and overall public health. The increasing severity of water pollution represents a global challenge, with profound implications for human society. In this study, hydrothermal carbonization coupled with alkaline activation was utilized to repurpose barley straw into activated carbon (AC) as an absorbent. Silver phosphate (Ag3PO4) was synthesized as a potent photocatalyst. Subsequent ultrasound-assisted loading integrated the robust adsorptive capabilities of the AC with the advanced photocatalytic efficiency of silver phosphate, resulting in a superior composite material (AC/Ag3PO4) and implementing a novel “absorption–photocatalysis” active circular degradation strategy to remove hazardous organics in water. Comprehensive characterization assays confirmed the successful synthesis and incorporation of Ag3PO4 onto the AC scaffold. The composite with a Ag3PO4 concentration of 3 wt % exhibited a high methylene blue (MB) removal efficiency of 99.4% within 100 min. The reaction rate of this composite surpassed that of standalone AC by a factor of 2.89. Furthermore, cyclic regeneration studies via adsorption–desorption methodologies revealed the composite’s resilience and sustained performance. The MB removal efficiency was maintained at 85.5% over five consecutive cycles, demonstrating the composite’s remarkable stability. The integration of adsorptive and photocatalytic functionalities within a single system mitigates potential secondary pollution arising during the AC’s desorption phase and enhances the organic contaminant removal efficiency. Moreover, the utilization of this integrated material reduces the quantity of chemicals and energy required for conventional adsorption water treatment techniques, as the material harnesses sunlight or alternative light sources to catalyze contaminant decomposition. This reduces the dependence on chemical treatment agents, contributing to resource conservation and alleviating environmental burdens. This pioneering approach offers a novel paradigm for addressing pollutant challenges in aqueous environments.
研究领域:
环境科学
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材料科学
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水处理
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纳米技术
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可持续化学
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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）