MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Mingming Zou,Honghong Liu,Lu Feng,Fengqiang Xiong,Tiju Thomas,Minghui Yang
A simple solvothermal approach with post-calcination is used to obtain (Ag, Ag 2 O) co-loaded TiO 2 microspheres with high specific surface area (43.8 m 2 g -1 ) and desirable visible light photocatalytic degradation (64% after 2 h visible light irradiation). Generally, N-doping of TiO 2 via nitridation using NH 3 improves the visible light absorption property of material. However, nitridation of (Ag, Ag 2 O) co-loaded TiO 2 results in a deleterious impact on the photocatalytic performance (around 20% after 2 h visible light irradiation). This is because nitridation of Ag-Ag 2 O-TiO 2 results in (a) reduction of Ag 2 O to Ag and (b) Ag agglomeration and grain growth on TiO 2 particles. These results in fact imply that in as-synthesized (Ag, Ag 2 O) co-loaded TiO 2 systems, local surface plasmonic resonance (associated with of 5–12 nm Ag particles) aids in enhanced broad band visible light absorption; furthermore the heterojunction between TiO 2 and Ag 2 O improves efficiency with which photogenerated carriers become available for photocatalysis . In all cases we show through selective radical quenching experiments that singlet oxygen is the primary reason for the dye degradation observed.
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 ELECTROANALYTICAL CHEMISTRY
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2016
·
IF 2.822
Yan Wang,Binbin Huang,Wanlin Dai,Jianshan Ye,Bin Xu
Ag/Ag 2 O-loaded poly(sodium4-styrenesulfonate) (PSS) functionalized reduced graphene oxide (rGO) composite (Ag/Ag 2 O-PSS-rGO) with high catalytic activity was synthesized for sensitive determination of capsaicin . The prepared composite was characterized by Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The obtained images revealed the good distribution of Ag/Ag 2 O on the PSS-rGO and confirmed the successful synthesis of the nanocomposite . Adsorptive stripping voltammetry (AdsSV) and differential pulse stripping voltammetry (DPSV) were used to study the electrochemical performance of the prepared sensor, and showed excellent electro-catalytic activity to the redox reaction of capsaicin due to the synergistic effect between Ag/Ag 2 O and PSS-rGO. Under the optimized conditions, the linear range of capsaicin was found to be 1.0–60 μM with a detection limit of 0.40 μM (S/N = 3).
研究领域:
分析化学
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材料科学
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食品科学
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DOI
高影响因子
Acta Biomaterialia
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2025
·
IF 9.6
Zhizi Ma,Zhuang Yang,Jie Ma,Sainan Liu,Qi Meng,Wenying Zhang,Ziyong Cheng,Zhangfeng Wang,Abdulaziz A. Al Kheraif,Ping’an Ma,Jun Lin
With the deepening of research of sonodynamic therapy (SDT), it is shown that the efficacy of single component and single functional sonosensitizers is not satisfactory. Therefore, this study utilized multihole TiO 2 @Ag 2 O (TA) as sonosensitizer to achieve synergetic SDT and sonothermal therapy (STT) under US irradiation. As a p-n nanoformulation, the construction of TA is conducive to generate a built-in electric field and lead to energy band bending, which are efficient in separating electrons and holes. Besides, it can promote carrier relaxation between the different energy bands to produce abundant phonons, inducing lattice thermal vibration and realizing the conversion of mechanical energy to thermal energy. Moreover, the feasibility of enhancing cavitation effect for improving sonothermal capability is demonstrated for the first time. When TA enters tumor cells under US irradiation, plentiful ⚫OH and 1 O 2 are generated to attack mitochondria, causing dysfunction, disrupting energy supply and damaging DNA, thereby inducing apoptosis. Meanwhile, TA can also cause rapid local heating of surrounding environment to kill tumor cells by lattice thermal vibration and cavitation bubbles bursting on its surface. Obviously, this work effectively achieves both heterojunction enhanced SDT, and carrier relaxation and cavitation effect promoted STT combined anti-tumor therapy through designing multihole p-n TA. Statement of Significance None
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2019
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IF 0
Fujin Sun,Qihui Zeng,Wen Tian,Yingming Zhu,Wei Jiang
Silver oxide is a high-performance visible-light-driven nanoparticle photocatalyst. However, its high cost and difficult recovery limit its wide application. Constructing a magnetic composite is a smart strategy to effectively utilize nanoparticle photocatalysts with acceptable performance maintenance. In this study, three magnetic ferrite supports, that is, CoFe 2 O 4 , ZnFe 2 O 4 , and NiFe 2 O 4 , were used as support to load Ag 2 O and construct Ag 2 O/MFe 2 O 4 composites to lower the Ag consumption and intensify the recovery rate. The photoactivity, stability, and magnetic recovery of the three composite magnetic photocatalysts were evaluated by using four typical organics. The results of the batch experiment confirm that Ag 2 O/MFe 2 O 4 (60%) possesses a good photoactivity and stability. However, Ag 2 O/ZnFe 2 O 4 exhibits a better photoactivity and higher magnetic recovery based on cycling during the semi-continuous process. The ferrites are inert for photocatalysis process without significant effect on Ag 2 O photocatalytic performance, but increase the surface area and improve the recovery rate as magnetic composite carriers.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujie Zhang,Rongfang Yuan,Huilun Chen,Beihai Zhou
Combining adsorption and photocatalysis as a synergistic technique has become a research trend since adsorption is a prerequisite for photocatalytic surface reactions. In this study, a Z-scheme heterojunction FeTiO 3 @Ag/Ag 2 O with local surface plasmon resonance (LSPR) effect was fabricated for the removal of dimethoate from water. Under visible light irradiation, dimethoate could be completely removed within 75 min in the presence of 0.3 g/L FeTiO 3 @Ag/Ag 2 O (with Ag 2 O percentage of 10 wt%). High removal efficiency of dimethoate was mainly attributed to the synergistic effect between the large specific surface area of the catalyst (160.695 m 2 /g), the formation of heterojunction of FeTiO 3 and Ag 2 O, and the LSPR effect of metal Ag, which reinforced the absorption of visible light and promoted the separation and transfer of the carriers. Radicals of O 2 − and OH were the main reactive groups triggered the photocatalytic degradation process of dimethoate. Density Functional Theory (DFT) calculations indicate that P S and P–S bonds in the dimethoate molecule were more susceptible to be attacked by reactive groups. The degradation pathways mainly include oxidation of P S bond and cleavage of P–S bond, and the toxicity of most intermediates was reduced when compared with the parent compound. This study exploited the role of adsorption and photocatalysis in the field of pollutant removal, and provides ideas for the preparation of bifunctional photocatalysts.
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
NANOTECHNOLOGY
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2020
·Vol. 31
·期 24
·245702
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IF 3.551
Yongfei Cui,Huanhuan Sun,Peng Guo
Strontium titanate (SrTiO3) with perovskite structure has recently received significant attention in t he area of photocatalysis. However, challenges remain relating to its industrial applications; the high charge carrier recombination rate and low light-harvesting efficiency being the main two. Herein, a novel strategy based on fabrication of a typical n-p heterojunction has been proposed and the typical narrow-bandgap p-type semiconductor Ag2O was chosen to be coupled with SrTiO3 using a facile chemical precipitation method. The phase compositions, microstructures and optical properties of the prepared SrTiO3/Ag2O heterostructured photocatalysts have been systematically investigated with an x-ray diffractometer, scanning electron microscope, high resolution transmission electron microscope, x-ray photoelectron spectroscope and UV–vis spectrophotometer. The photocatalytic properties were evaluated through photodegradation of a common organic dye Rhodamine B (RhB). The results demonstrated that the heterostructured photocatalyst SrTiO3/Ag2O-0.15 outperformed pristine SrTiO3 and Ag2O. Specifically, the reaction rate of SrTiO3/Ag2O-0.15 is about 69 times and 4 times that of bare SrTiO3 and Ag2O respectively in photodegradation of RhB. The excellent photocatalytic performance was attributed to the synergetic effect between the improved visible-light harvesting efficiency and inhibited electron–hole recombination rate arising from the built-in electric field in a p-n heterojunction, as evidenced by the transient photocurrent and photoluminescence spectrum investigation. Furthermore, the excellent recyclability of the heterostructured photocatalyst was confirmed and holes were verified to be the major active species contributing to the overall degradation. Our findings demonstrate construction of p-n heterojunctions with narrow-bandgap semiconductors as a feasible avenue to promote overall photocatalytic efficiency, through simultaneously boosting charge-carrier separation and expanding photon-absorption range.
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
ACS Omega
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2021
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IF 3.512
Runtian He,Teng Ma,Jiong Cheng,Binbin Jin,Jing Xu
Formation of formic acid from renewable biomass resources is of great interest since formic acid is a widely used platform chemical and has recently been regarded as an important liquid hydrogen carrier. Herein, a novel approach is reported for the conversion of glucose, the constituent carbohydrate from the cellulose fraction of biomass, to formic acid under mild hydrothermal conditions with simultaneous reduction of Ag2O to Ag. Results showed that glucose was selectively converted to formic acid with an optimum yield of 40.7% and glycolic acid with a yield of 6.1% with 53.2% glucose converting to carbon dioxide (CO2) immediately at a mild reaction temperature of 135 °C for 30 min. In addition, Ag2O was used as a solid oxidant for glucose oxidation, which avoids the use of traditionally dangerous liquid oxidant H2O2. Furthermore, complete conversion of Ag2O to Ag can be achieved. This study not only developed a new method for value-added chemical production from renewable biomass but also explored an alternative low-carbon and energy-saving route for silver extraction and recovery.
研究领域:
化学工程
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可再生资源利用
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Jiaman Wang,Zekai Cui,Yuechang Wei,Zhiling Tang,Jing Xiong,Yingli Wang,Xiong Wang,Xuanzhen Li,Yunpeng Liu,Zhen Zhao
MOF-derived Ag 2 O/TiO 2 p-n heterojunction enhances charge separation. • Ag 2 O acts as a proton shuttle, enabling selective CO 2 reduction to CH 4 . • In-situ DRIFTS and DFT reveal the key role of *CO protonation. • Achieves 27.89 μmol g −1 h −1 CH 4 rate with 85.87% selectivity. The photocatalytic conversion efficiency of CO 2 with H 2 O to hydrocarbons is dependent on the simultaneous enrichment of protons and electrons. Herein, the composite photocatalyst of Ag 2 O/TiO 2 were constructed by anchoring Ag 2 O species onto the MOF-derived TiO 2 support via a laser deposition technique. The optimally engineered Ag 2 O/TiO 2 photocatalyst exhibited a remarkable CH 4 selectivity of 85.87% with a formation rate of 27.89 μmol g −1 h −1 in the photocatalytic reduction of CO 2 to CH 4 , surpassing the near-zero CH 4 yield of pristine MIL-125(Ti). By combining the results of in situ DRIFT spectra and density functional theory calculations, the photocatalytic mechanism is proposed: The catalytic interface effectively overcomes the kinetic bottleneck of *CO hydrogenation, by synchronously delivering enriched protons from the Ag 2 O sites and photogenerated electrons from the MOF-derived TiO 2 support. This targeted facilitation of the critical *CO protonation step suppresses intermediate desorption which dictates the selectivity toward CH 4 . This work unveils a universal strategy of coupling robust MOF-derived microenvironments with dynamic proton-electron delivery to overcome kinetic limitations in multi-step catalytic processes. Download: Download high-res image (277KB) Download: Download full-size image
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2022
·
IF 4.889
Lanqing Deng,Lang Chen,Liangdi Zhu,Yang Li,Jie Ou-Yang,Shaofeng Wu,Peng Chen,Sheng Shen,Junkang Guo,Yongbo Zhou,Chak-Tong Au,Shuang-Feng Yin
Being extensively applied in various fields of chemistry and chemical industry, the development of a green and versatile method for the synthesis of amides is in line with the demand of sustainable chemistry. Herein, a direct, highly selective, and scale-up (5–20 mmol) method for photocatalytic synthesis of amides through aerobic oxidative amination of alcohols with amines was developed under visible light, room temperature, using air as the oxidant. Benefiting from the adsorption of sodium hemiaminal on catalyst lengthens the C H bond (1.148 Å), this novel process is feasible for a broad range of functionlized amides (69 examples), especially those for drug manufacture (e.g., moclobemide and pipobroman). Imines was almost prevented with excellent amide selectivity up to 99 % could be ascribed to the low energy barrier for hemiaminal dehydrogenation while that for dehydration is high (2.13 eV). This green and efficient protocol represents an ideal alternative to the currently known methods.
研究领域:
有机化学
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催化化学
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环境化学
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产品关联
DOI
高影响因子
Science Bulletin
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2019
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IF 6.277
Shaofei Wang,Shanli Yang,Haoxi Wu,Jiaolai Jiang,Lang Shao,Yiming Ren,Yingru Li,Chuanhui Liang,Mingfu Chu,Xiaolin Wang
Charge-transfer (CT) is an important enhancement mechanism in the field of surface-enhanced Raman scattering (SERS) that typically increases the Raman intensity of molecules by as much as 10–100 times. Herein, a low-cost Ag 2 O aggregates substrate was prepared via a facile chemical precipitation method, and the calculated CT-based enhancement factor of the uranyl ions adsorbed on it reached as high as 10 5 , a metal-comparable value. The efficient photoinduced CT process from the valence band of Ag 2 O to the LUMO of uranyl ions under appropriate excitation sources resulted in the repulsion of the axial oxygen atoms of the O U O bond, which enhanced its polarizability , creating a more intense Raman mode. To the best of our knowledge, this study firstly reports such a strong photoinduced CT enhancement of uranyl ions, with concentrations of 10 −8 mol L −1 or lower being detected using this Ag 2 O substrate. Most importantly, this research has shown that the photoinduced CT enhancement also contributes to the SERS of uranyl ions on pure Ag substrates which have often been ascribed to the electromagnetic enhancement in previous studies. In addition, Ag 2 O can be used to selectively detect uranyl ions without interference from many other molecules or ions because of the energy matching rule of the photoinduced CT process, which was readily available for uranyl detection in the environmental aqueous solution.
研究领域:
化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2026
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IF 5.2
Juntong Zhou,Ya Li,Yang Chen,Yijie Liu,Jingyi Xu,Nengqin Jia
An ECL-smartphone colorimetric dual-mode sensor is developed using SnS 2 QDs and Ag 2 O nanozyme. • SnS 2 QDs exhibit high and stable ECL intensity for durable detection. • Ag 2 O nanozyme catalyzes TMB oxidation, in free of H 2 O 2 . • This sensor achieves high-sensitivity detection to suppress false positives. Sulfadiazine (SDZ), a widely used antibiotic, poses a serious residue threat to food safety, necessitating the development of rapid, sensitive, and reliable detection. Here, a dual-mode sensor combining electrochemiluminescence (ECL) and smartphone-based colorimetry is developed using SnS 2 quantum dots (QDs) as the ECL emitter and Ag 2 O nanozyme as the 3,3′,5,5′-tetramethylbenzidine (TMB) coloring catalyst. This dual-mode platform, which features a molecularly imprinted polymer (MIP)-SDZ-aptamer sandwich configuration, combines the high sensitivity and wide dynamic range of ECL with the simplicity, visual readability, and portability of smartphone-based colorimetric analysis. The sensor exhibited high sensitivity in a wide linear range (10 −4 –10 3 μM) with a low detection limit (5.8 × 10 −5 μM, S/N = 3). Spiked recovery tests in real chicken samples confirmed its high accuracy and reliability. This work not only provides a convenient, low-cost, and accurate method for SDZ detection but also offers a new strategy for the potential application of multimodal sensing platforms in food safety monitoring. Download: Download high-res image (147KB) Download: Download full-size image
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Jianfeng Gou,Qiuling Ma,Xiaoyong Deng,Yuqi Cui,Huixuan Zhang,Xiuwen Cheng,Xiaoli Li,Mingzheng Xie,Qingfeng Cheng
Norfloxacin, as an antimicrobial drug, has frequently been detected in municipal plants, which is predicted to be potential risk on human beings and the environment. In the present study, zeolite immobilizes silver oxide decorated titanium dioxide (Ag 2 O/TiO 2 -Zeolite) composite has been fabricated through modified sol-gel method. Afterwards, physicochemical properties of the as-fabricated Ag 2 O/TiO 2 -Zeolite sample are systematically studied by scanning electron microscope, X-ray diffraction, X-ray photoelectron microscopy, ultraviolet visible diffuse reflectance spectroscopy and surface photovoltage spectra measurements. Besides these, photocatalytic (PC) performance of Ag 2 O/TiO 2 -Zeolite composite is evaluated by photodecomposition of norfloxacin under simulated solar light illumination and generation of active hydroxyl ( OH) radicals. Results indicate that the decorated Ag species exists in the form of Ag 2 O, which can greatly enhance the visible light absorbance and charge separation efficiency. Furthermore, Ag 2 O/TiO 2 -Zeolite composite displays superior PC performance, which is mainly ascribed to the intense light absorbance in visible region, narrow band gap level and high charge separation efficiency. In addition, the solar light PC degradation pathways of norfloxacin are proposed according to the HPLC-MS/MS measurements, including hydroxylation addition to parent compound, decarboxylation and defluorination of side chain from the norfloxacin. Moreover, the as-fabricated Ag 2 O/TiO 2 -Zeolite composite exhibits high stability after consecutive utilization for seven times.
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高影响因子
危险品化学品经营许可证（带存储）