Journal of the Taiwan Institute of Chemical Engineers
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2015
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IF 3
Xia Cui,Yi Fan Zheng,Huan Zhou,Hao Yong Yin,Xu Chun Song
In this study, the Ag 3 PO 4 microcrystal was successfully prepared at different temperatures using precipitation and hydrothermal methods. The as-prepared products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and so on. It was found that the synthesized temperature had some effects on the morphologies and photocurrent of Ag 3 PO 4 . As the synthesized temperature increased from 20 °C to 120 °C, the ratio of exposed (110) facets increased, which are the active photocatalysis facets in Ag 3 PO 4 crystals, along with a higher photocatalytic efficiency over RhB under visible light irradiation. And the Ag 3 PO 4 microcrystals synthesized at 120 °C exhibited the highest photocatalytic activities with the degradation ratio of RhB rising up to 97.83% in 6 min due to the high separation efficiency of electron and hole pairs. In addition, the main active species and their roles were investigated by adding scavengers (isopropyl alcohol and EDTA) during the photocatalytic degradation of RhB and a possible mechanism was discussed.
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TALANTA
·
2017
·
IF 4.162
Xue Wang,Bing Zhang,Jing Li,Honghong Chang,Wenlong Wei
Colorimetric assay is a powerful tool for detection of tumor markers with the outstanding advantages of visualization and simple analytical instruments. Herein, a simple and fast chromogenic reaction was developed based on Ag 3 PO 4 /Ag nanocomposite synthesized by one-step chemical bath method. And the Ag 3 PO 4 /Ag nanocomposite owned the ability of oxidizing of TMB under the acidic condition due to the hydrolytic action. The nanocomposite was characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Then, the colorimetric immunoassay was constructed by utilizing Ag 3 PO 4 /Ag nanocomposite as molecular labels for carcino embryonie antigen (CEA, UniProt accession number: P06731) detection. The blue color with gradient change was observed with the increasing of CEA concentrations. Under optimal conditions, the variation between absorbance values and CEA levels was linear in the range of 0.2 ng mL −1 ~ 2.5 ng mL −1 with the detection limit of 0.03 ng mL −1 . More importantly, the developed colorimetric immunoassay exhibited good selectivity , repeatability, stability and potential application in the real serum sample detection.
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Asia-Pacific Journal of Chemical Engineering
·
2024
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IF 1.4
Jianke Tang,Qiaoling Li,Rongqian Meng,Yanfeng Xue,Shengjian Zhang,Shengjuan Shao
Using the prepared Ag 3 PO 4 /WO 3 ·H 2 O composite as the matrix, AgI nanoparticles were introduced onto the surface of Ag 3 PO 4 to construct AgI/Ag 3 PO 4 /WO 3 ·H 2 O ternary heterojunction photocatalysts. The ternary composite photocatalysts exhibited higher photocatalytic degradation activities for rhodamine B (RhB) and tetracycline hydrochloride (TCH) than those of binary Ag 3 PO 4 /WO 3 ·H 2 O and AgI/WO 3 ·H 2 O photocatalysts and individual AgI, Ag 3 PO 4 , and WO 3 ·H 2 O photocatalysts. After exposure to visible light for 12 and 24 min, the removal efficiencies of RhB and TCH by the S2-50% photocatalyst (50% molar percentage of AgI to Ag 3 PO 4 ) reached 98.0% and 85.3%, respectively. After four degradation cycles, the removal efficiency of RhB by S2-50% remained at 93.2%, significantly surpassing that of the Ag 3 PO 4 /WO 3 ·H 2 O photocatalyst. The enhanced photocatalytic performance of the AgI/Ag 3 PO 4 /WO 3 ·H 2 O photocatalyst is primarily attributed to the formation of Z-scheme/conventional Type II heterojunctions, which facilitate spatial separation of the photogenerated electrons and holes while maintaining the strong reductive capabilities of electrons in the AgI conduction band.
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Desalination and Water Treatment
·
2024
·
IF 1
Jun Xu,Shanqing Jiang,Jiahui Ma,Qiuya Zhang,Hui Peng,Li Jiao,Liping Wang
Protonated g-C 3 N 4 (CNH) was prepared with g-C 3 N 4 powder by HNO 3 hydrothermal method, and Ag 3 PO 4 /CNH composite was further synthesized by chemical precipitation. The prepared samples were characterized by X-ray diffraction, Fourier transform infrared spectra, UV–Vis diffuse reflectance spectrometer, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, photoluminescence spectra and electron spin resonance. The photocatalytic performance of Ag 3 PO 4 /CNH under visible light was evaluated by the microcystin-LR (MC-LR) degradation experiment. The results showed that Ag 3 PO 4 could be successfully loaded on the surface of CNH, and its light absorption intensity was significantly improved compared with CNH. When the mass ratio of Ag 3 PO 4 was 20% in Ag 3 PO 4 /CNH composite, the photodegradation efficiency of MC-LR was the highest under the condition of visible light irradiation for 2 h with the degradation rate of 79.8% which was 5.4 times higher than that of pure CNH and 9.8 times higher than that of pure g-C 3 N 4 . The photodegradation reaction of Ag 3 PO 4 /CNH for MC-LR was in line with quasi-first-order kinetic model. The scavenger tests proved that ·O 2 – and h + played the major role in the degradation process. A possible Z-scheme degradation mechanism of MC-LR over Ag 3 PO 4 /CNH hybrid was proposed.
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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纳米材料
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Desalination and Water Treatment
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2024
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IF 1
Xiaoting Hong,Yumei Zhou,Zhuoliang Ye,Haifeng Zhuang,Wanpeng Liu,K.S. Hui,Zhi Zeng,Xianhuan Qiu
Ag 3 PO 4 /TiO 2 nanocomposite was fabricated by an in situ precipitation method and then blended into poly(vinylidene fluoride) (PVDF) casting solution to prepare the ultrafiltration membrane via wet phase inversion technique. The water flux and bovine serum albumin (BSA) rejection rate of membrane were investigated; meanwhile, the ultrafiltration membrane morphologies and structural properties were analyzed using scanning electron microscope (SEM) and X-ray diffraction. Compared with the control membrane, the permeate performance of blended membranes was improved while possessing a steady BSA retention due to enhanced hydrophilicity. Mechanical tests revealed that the modified membranes exhibited a larger tensile strength and breakage elongation. SEM images and the halo zone testing were employed to assess the antibacterial performances of the nanocomposite membranes against Escherichia coli. The antibacterial tests confirmed that the modified membranes showed an effective antibacterial property against E. coli.
研究领域:
材料科学
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环境工程
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膜技术
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纳米复合材料
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水处理
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Caiyu Luo,Yan Lin,Yupei Zhang,Shuai Zhang,Shehua Tong,Shaohua Wu,Chunping Yang
Antibiotics in swine wastewater could lead to risks to the environment and human health, and it is a competitive alternative to degrade antibiotics via photocatalysis which is green and eco-friendly. However, charge separation efficiency and light absorption capacity have been key factors limiting the technology. In this work, we synthesized the novel photocatalysts of MOF-545/Ag 3 PO 4 via solvothermal methods, and examine the performance and mechanism for the degradation of oxytetracycline (OTC) in swine wastewater. The results showed that compared with Ag 3 PO 4 , the composite catalysts have stronger photoresponse and charge separation ability. MOF-545/Ag 3 PO 4 could completely degrade OTC within 3.0 min with a rate constant of 3.97 min −1 which is 12.9 times that of Ag 3 PO 4 . OTC removal was still 100% within 3.0 min after 5 cycles, which confirmed that the composite catalyst was stable. Data from free radical capture tests showed that photogenerated holes (h + ) and superoxide radicals (•O 2 – ) played a dominant role in OTC degradation. In-situ X-ray photoelectron spectroscopy (XPS) spectra and electron spin resonance (ESR) spectra proved the formation of an S-scheme heterojunction in MOF-545/Ag 3 PO 4 , which greatly improves the carrier separation efficiency of catalysts. This study provides a novel MOF-based catalyst for improving photocatalytic performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 10
·7543-7558
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IF 2.779
Duan Mengtian,Wu Daoxin,Wu Jialun,Tong Haixia
A precipitation process was used to produce Ag 3 PO 4 with an irregular small polyhedral structure and an average size of 200–300 nm. Furthermore, using a simple dissolution precipitation technique, polyhedral Ag 3 PO 4 was successfully deposited on the surface of ZnWO 4 . XRD, SEM, TEM, XPS, UV–Vis DRS, and FT-IR spectroscopy were employed to analyze ZnWO 4 /Ag 3 PO 4 composites. The photocatalytic oxidation ability of composites was assessed using Rhodamine B dye degradation model. The results revealed that ZnWO 4 /Ag 3 PO 4 composite material displayed improved visible-light photocatalytic activity, with 7% ZnWO 4 /Ag 3 PO 4 exhibiting the maximum photocatalytic activity. The degradation rate of RhB was 94.0% after 120 min of visible-light irradiation. Nyquist plot indicates that 7% ZnWO 4 /Ag 3 PO 4 composites show the smallest diameter, suggesting a more effective separation of photogenerated electron–hole pairs and faster interface charge transfer. The photocatalytic activity of ZnWO 4 /Ag 3 PO 4 composites does not deteriorate considerably after four cycles, indicating their high stability. The active species capture tests show that h + and •OH are possible reactive species in the degradation reaction. Finally, the p-n heterojunction mechanism is proved by the discussion of the band structure. This study demonstrates that ZnWO 4 /Ag 3 PO 4 photocatalytic composites can be utilized to degrade contaminants.
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Sustainability
·
2023
·Vol. 15
·期 17
·13279
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IF 3.9
Ke Li,Miaomiao Chen,Lei Chen,Songying Zhao,Wencong Xue,Yanchao Han
In this study, a novel Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst was successfully synthesized, tailored specifically for the visible light-driven photocatalytic degradation of sulfonamide antibiotics, more precisely, sulfamethazine (SMZ). To analyze the fabricated samples, characterization techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), and UV-vis diffuse reflectance spectra (UV-vis) were systematically employed. The composite showcased efficient visible-light absorption and charge separation, with its peak photocatalytic performance recorded at a solution pH value of 6.0. Significantly, the Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst displayed excellent stability and recyclability, consistently maintaining a high degradation efficiency of over 97% even after five consecutive cycles. Further experimentation with radical scavengers confirmed a significant decrease in photocatalytic activity, establishing that superoxide radicals (•O2−) and photo-generated holes (h+) are the primary active species during the degradation of SMZ. Overall, it provides a crucial understanding regarding the photocatalytic decomposition of sulfonamide antibiotics using magnetic composite photocatalysts. It also emphasizes the promising potential of the Fe3O4/Ag3PO4/g-C3N4composite for tangible applications in environmental remediation.Keywords:visible light;photocatalysis;Fe3O4/Ag3PO4/g-C3N4;sulfonamide
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Tengfei Li,Haoran Wei,Hanzhong Jia,Tianjiao Xia,Xuetao Guo,Tiecheng Wang,Lingyan Zhu
The application of Ag3PO4 as a commonly used photocatalyst is limited by its high recombination potency and electron–hole pairs with weak redox potential. It is significant to enhance the photocatalytic activity of Ag3PO4 by coupling with a wide band gap semiconductor. In this study, Ag2WO4 was selected to promote the photocatalysis of Ag3PO4 giving that it has wide band gap energy and strong redox potential. A facile chemical precipitation method was applied to assemble Ag2WO4 nanoparticles on the surface of Ag3PO4 to form an Ag2WO4/Ag3PO4 heterojunction. The Ag2WO4/Ag3PO4 heterojunction containing 7.5% molar mass of WO42– (7.5W) displayed the most superior photocatalytic efficiency under simulated solar light irradiation: 93% of bisphenol A was degraded just within 10 min and above 75% was mineralized within 30 min. The degradation reaction rate constant was 3 times higher than that of the pure Ag3PO4. The excited high-level-energy electrons on the conduction band of Ag3PO4 would transfer thermodynamically to the conduction band of Ag2WO4, and the generated valence band holes on Ag2WO4 easily shifted to the low-energy valence band of Ag3PO4, resulting in high separation of electron–hole pairs. The photogenerated holes and superoxide radical species played predominant roles in the reaction system.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hui Li,Yanlin Zhang,Qian Zhang,Yifei Wang,Yanping Fan,Xin Gao,Jing Niu
In our work, Z -scheme Ag 3 PO 4 /NG/WO 3 composites were fabricated via a facile deposition approach, which was used in the photocatalytic degradation of indomethacin (IDM) under visible light irradiation. The as-prepared Ag 3 PO 4 -based photocatalysts were characterized by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscope , Fourier transform infrared, X-ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy in order to determine the chemical structure , morphological feature and optical performance. From the degradation experiments of IDM, the Ag 3 PO 4 /NG/WO 3 composite exhibited the highest photocatalytic activity and stability, and its kinetics constant was ~8 times of pure Ag 3 PO 4 . Furthermore, reactive species trapping experiment, electron spin resonance , liquid chromatography-mass spectrometry, total organic carbon , photoelectrochemical measurement and photoluminescence spectra were applied to analyze the possible degradation pathways and photocatalytic mechanism of IDM. The results indicated that the visible-light photocatalytic degradation of IDM using Ag 3 PO 4 /NG/WO 3 conformed to a Z -scheme photocatalysis mechanism, further facilitating the photoinduced charge carriers separation, and inhibiting the recombination of photoinduced electron-hole pairs. It also confirmed that the holes, OH and O 2 – radicals generated in Z -scheme system played the significant roles during the photocatalytic degradation of IDM.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiangyu Zhang,Chao Zhang,Yongqiang Yang,Hongyu zhang,Xiaobo Huang,Ruiqiang Hang,Xiaohong Yao
Bacterial infection is one of the serious problems during wound healing. Antibiotics and traditional antibacterial treatment can produce side effects, such as bacterial resistance, cell toxicity, during the long-term interaction with bacteria. Therefore, developing new antibacterial materials and methods for rapid and safe disinfection in wound healing is important. This work fabricated a hybrid hydrogel incorporated with Ag 3 PO 4 /MoS 2 composites for rapid sterilization during wound healing. This hydrogel exhibited a superior antibacterial activity within 5 min by co-irradiation of 660 nm visible light (VL) and 808 nm near infrared (NIR) light due to the synergistic effects of both photodynamic antibacterial and photothermal antibacterial treatments. In addition, the antibacterial hydrogel could promote the wound healing compared with the pure hydrogel and medical gauze (MG) and cause no noticeable organ abnormalities in rats during the wound healing process.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yali Zhai,Youzhi Dai,Jing Guo,Lulu Zhou,Minxing Chen,Hantong Yang,Liangping Peng
In the study, a series of novel Z-scheme biochar@CoFe 2 O 4 /Ag 3 PO 4 photocatalysts were synthesized and employed to degrade bisphenol A under visible light irradiation (λ ≥ 420 nm). The structural morphology, optical properties and physicochemical properties of composites were characterized by means of TEM , XRD , FT-IR, XPS , UV–Vis, BET, EIS and VSM analysis. The photocatalytic performances of the photocatalysts were evaluated systematically. The MBA-3 photocatalyst exhibited the highest photocatalytic and mineralization ability within 60 min among all photocatalysts, 91.12% and 80.23%, respectively. After four cycles, the degradation of BPA still kept the photocatalytic activity of 73.94%, and the removal rate of TOC remained 58.96%. Moreover, the active species in the photocatalytic process were evaluated, and we proposed the Z-scheme photocatalytic mechanism for highly efficient degradation of BPA. According to the GC-MS results, the photodegradation pathway of BPA is also suggested. The present study has provided a valuable way of using the magnetic biochar in the design of new and efficient system for the degradation of organic pollutions in waste water .
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