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Highly Efficient Photocatalytic Remediation of Simulated Polycyclic Aromatic Hydrocarbons （PAHs） Contaminated Wastewater under Visible Light Irradiation by Graphene Oxide Enwrapped Ag3PO4 Composite

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Chinese Journal of Chemistry 2017年第10期35卷 1549-1558页

作者： Xiaolong Yang Haoyuan Cai Mutai Bao Jianqiang Yu Jinren Lu Yiming Li Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao Shandong 266100 China School of Chemistry and Chemical Engineering Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province Qingdao University Qingdao Shandong 266071 China

Effective removal of polycyclic aromatic hydrocarbons （PAHs） from wastewater before their discharge into the environment is an ever pressing requirement. In this study, for the first time, simulated PAHs contaminated wastewater was photocatalytically remediated with graphene oxide （GO） enwrapped silver phosphate as visible light-driven photocatalysts. The GO/Ag3PO4 photocatalysts exhibited superior photocatalytic activity and stability compared with pure Ag3PO4, g-C3N4 and TiO2 （P25）. The degradation efficiency of naphthalene, phenanthrene and pyrene could reach 49.7%, 100.0% and 77.9%, rspectively within 5 min irradiation. The apparent rate constants of photocatalytic degradation of 3 wt% GO/Ag3PO4 composRe photocatalyst were 0.14, 1.21 and 2.46 rain^-1 for naphthalene, phenanthrene and pyrene, respectively. They were about 1.8, 1.5 and 2.0 times higher than that of pure Ag3PO4, and much higher than that of g-C3N4 and TiO2. Meanwhile, the efficiencies of 44.6%, 95.2% and 83.8% were achieved for naphthalene, phenanthrene and pyrene degradation even after 5 times of recycling in the GO/Ag3POa-PAHs photocatalysis system. Reactive species of O2^- and h^＋ were considered as the main partici- pants for oxidizing naphthalene, phenanthrene and pyrene.

关键词： polycyclic aromatic hydrocarbons (PAHs) photocatalysis silver phosphate graphene oxide degradation

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Ag3PO4 colloidal nanocrystal clusters with controllable shape and superior photocatalytic activity

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Nano Research 2015年第1期8卷 106-116页

作者： Fei Pang Xueteng Liu Mingyuan He Jianping Ge Department of Chemistry Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal UniversityShanghai 200062 China

Cluster-like Ag3PO4 nanostructures including nanoparticles, trisoctahedrons, tetrahedrons and tetrapods have been prepared by the synergetic reaction of Ag nanocrystals, phosphate anions and hydrogen peroxide. The acidity and alkalinity of the reaction solution are tuned to adjust the oxidizing ability of H2O2, and thus control the final morphology. Ag nanocrystals function as a sacrificial precursor, leading to the generation of clusterqike nanostructures. Through a kinetic study, the formation of Ag3PO4 nanocrystal clusters can be understood as the conversion from Ag to AgBPO4 nanocrystals assisted by H2O2, followed by the oriented attachment of nanocrystals into cluster-like colloids with specific shapes. The as-prepared AgBPO4 nanostructures have higher photocatalytic activity than commercial TiO2 and some reported AgBPO4 microcrystals in the degradation of dyes. The catalytic activity decreases in the order nanoparticles 〉 trisoctahedrons 〉 tetrahedrons 〉 tetrapods, while the stability increases in the order nanoparticles 〈 tetrahedrons 〈 trisoctahedrons 〈 tetrapods, which can be explained by the extent of absorption of visible light and structural factors, including size and exposed crystal facets.

关键词： nanocrystal cluster photocatalysis silver phosphate

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Photocatalytic degradation of dyes by AgBr/Ag_3PO_4 and the ecotoxicities of their degraded products

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Chinese Journal of Catalysis 2016年第5期37卷 711-719页

作者： Pongsaton Amornpitoksuk Sumetha Suwanboon 宋卡王子大学理学院化学系和化学杰出创新中心宋卡王子大学能源纳米技术杰出中心宋卡王子大学理学院材料科学与技术系

Ag3PO4 powders were prepared through a precipitation reaction between AgNO3 and precipitating agent solutions that were prepared by adjusting the amount of H3PO4 in the Na3PO4 solutions. The Ag3PO4 powders prepared from the precipitation solution with a pH of 6 showed the highest photocatalytic activity for decolorizing the methylene blue and rhodamine B dyes. These Ag3PO4 powders were further modified by the addition of KBr solutions to obtain AgBr/Ag3PO4 powders and these photocatalysts can decolorize the anionic dyes as reactive orange and methyl orange. The reactive species involved in the photocatalytic degradation process were evaluated for their inhibitory activity using the appropriate scavengers. After photocatalysis, mass spectrometry confirmed that the dyes were degraded to smaller molecules. The ecotoxicities of the dye solutions before and after treatment were evaluated by studying their ability to inhibit the growth of the bioindicator Chlorella vulgaris.

关键词： silver phosphate silver bromide Photocatalytic degradation One-pot synthesis Ecotoxicity

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Recent progress in Ag_3PO_4-based all-solid-state Z-scheme photocatalytic systems

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Chinese Journal of Catalysis 2017年第11期38卷 1794-1803页

作者： Ming Ge Zhenlu Li College of Chemical Engineering North China University of Science and Technology Tangshan 063210 Hebei China Hebei Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment Tangshan 063210 Hebei China

Heterogeneous semiconductor photocatalysis is a promising green technology solution to energyand environmental *** photocatalyst TiO2,with a wide band gap of3.2eV,canonly be excited by UV light and utilizes less than4%of solar *** phosphate(Ag3PO4)isamong the most active visible‐light‐driven photocatalysts ***,unwanted photocorrosionis the main obstacle to the practical application of *** effort has been made inrecent years to address this issue and further enhance the photocatalytic performance of *** construction of Z‐scheme photocatalytic systems that mimic natural photosynthesis is a promisingstrategy to improve the photocatalytic activity and stability of *** brief review conciselysummarizes and highlights recent research progress in Ag3PO4‐based all‐solid‐state Z‐schemephotocatalytic systems with or without a solid‐state electron mediator,focusing on their construction,application,and reaction ***,the challenges and future prospects ofAg3PO4‐based Z‐scheme photocatalytic systems are discussed.

关键词： silver phosphate Photocatalysis Z‐scheme system Application Mechanism

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Ag_3PO_4/Ag_2CO_3 p–n heterojunction composites with enhanced photocatalytic activity under visible light

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Chinese Journal of Catalysis 2015年第12期36卷 2186-2193页

作者：法文君王平岳冰杨风岭李大鹏郑直许昌学院表面微纳米材料研究所河南省微纳米能量储存与转换材料重点实验室河南许昌461000 郑州大学化学与分子工程学院河南郑州450001 平顶山学院化学化工学院河南平顶山467000

Formation of a p–n heterojunction rather than p-type or n-type semiconductors can enhance the separation of photogenerated electrons and holes and increase the quantum efficiency of photocatalytic reactions owing to the difference of the electric potential in the inner electric field near the junction,pointing from n toward p. n-Ag3PO4/p-Ag2CO3 p–n heterojunction composites are prepared through a facile coprecipitation process. The obtained Ag3PO4/Ag2CO3 p–n heterojunctions exhibit excellent photocatalytic performance in the removal of rhodamine B（RhB） compared with Ag3PO4 and Ag2CO3. The 40%-Ag3PO4/Ag2CO3 composite photocatalyst（40 mol% Ag3PO4 and 60 mol% Ag2CO3） exhibits the best photocatalytic activity under visible light,demonstrating the ability to completely degrade RhB within 15 min. Transient photovoltage characterization and an active species trapping experiment further indicate that the formation of a p–n heterojunction structure can greatly enhance the separation efficiency of photogenerated carriers and produce more free h＋active species,which is the predominant contributor for RhB removal.

关键词： silver phosphate silver carbonate Composite catalyst p–n heterojunction Visible light Transient photovoltage

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Construction of Ag_3PO_4/Ag_2MoO_4 Z-scheme heterogeneous photocatalyst for the remediation of organic pollutants

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Chinese Journal of Catalysis 2017年第2期38卷 337-347页

作者：唐华付彦惠苌树方谢思雨唐国刚江苏大学材料科学与工程学院江苏镇江212003 镇江高等专科学校化学与材料工程学院江苏镇江212003

Hole/electron separation and charge transfer are the key processes for enhancing the visible-light photocatalysis performance of heterogeneous photocatalytic *** better utilize and understand these effects,binary Ag3PO4/Ag2MoO4 hybrid materials were fabricated by a facile solution-phase reaction and characterized systematically by X-ray diffraction（XRD）,energy-dispersive spectroscopy,Fourier transform infrared spectroscopy,Raman spectroscopy,field-emission scanning electron microscopy and ultraviolet-visible diffuse-reflectance *** visible-light illumination,a heterogeneous Ag3PO4/Ag/Ag2MoO4 photocatalyst was constructed and demonstrated enhanced photocatalytic activity and photostability compared with pristine Ag3PO4toward the remediation of the organic dye rhodamine *** Ag3PO4/Ag2MoO4 hybrid catalyst with8%mole fraction of Ag2MoO4 exhibited the highest photocatalytic activity toward the removal of typical dye molecules,including methyl orange,methylene blue and phenol aqueous ***,the mechanism of the photocatalytic enhancement was investigated via hole- and radical-trapping experiments,photocurrent measurements,electrochemical impedance spectroscopy and XRD *** XRD analysis revealed that metallic Ag nanoparticles formed initially on the surface of the Ag3PO4/Ag2MoO4 composites under visible-light illumination,leading to the generation of a Ag3PO4/Ag/Ag2MoO4 Z-scheme tandem photocatalytic *** enhanced photocatalytic activity and stability were attributed to the formation of the Ag3PO4/Ag/Ag2MoO4Z-scheme heterojunction and surface plasmon resonance of photo-reduced Ag nanoparticles on the ***,a plasmonic Z-scheme photocatalytic mechanism was *** work may provide new insights into the design and preparation of advanced visible-light photocatalytic materials and facilitate their practical application in environmental issues.

关键词： Z-scheme heterojunction silver phosphate Hybrid material Charge transfer Photocatalysis

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钒酸离子掺杂的Ag3PO4及其在可见光下光解氧化水的性质研究（英文）

钒酸离子掺杂的Ag3PO4及其在可见光下光解氧化水的性质研究（英文...

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第十三届全国太阳能光化学与光催化学术会议

作者：李叶澄余济美香港中文大学化学系

＜正＞The photolysis of water catalysed by semiconductors is a promising approach for solar energy *** semiconductor photocatalysts that can directly split water under visible-light irradiation have attracted much ***,silver orthophosphate was found to be a simple and efficient photocatalyst for water ***,the new material suffered from poor stability under visible light irradiation.

关键词： photocatalysis water-splitting silver phosphate

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