RSC Advances
·
2015
·Vol. 6
·期 4
·3186-3197
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IF 3.84
Zhifeng Jiang,Jimin Xie
Novel visible-light-driven Ag/Ag2O@g-C3N4 (AAC) hybrid materials were synthesized successfully via a green, facile hydrothermal treatment approach by reducing AgNO3 using carbon nanodots as reducing agent for the first time. Natural leaves were used as precursors to prepare carbon nanodots. By adjusting the feed mass ratio of AgNO3 to carbon nanodots, the average diameter of Ag/Ag2O can be modulated from 8 to 33 nm. The effects of Ag/Ag2O deposition on the optical and photocatalytic performance of AAC in the degradation of rhodamine B (RhB) under visible light irradiation were systematically investigated. It was found that the Ag/Ag2O content greatly influences the photocatalytic activity of AAC nanocomposites. A suitable amount of Ag/Ag2O in the AAC system could obtain the best photocatalytic activity. The experimental results indicated that all the AAC nanocomposites showed higher photocatalytic activities compared with that of pure g-C3N4. The remarkable visible-light photocatalytic activity of AAC heterostructures could be attributed to their absorption in the visible region and low recombination rate of the electron–hole pairs because of the heterojunction formed between Ag2O and g-C3N4. In addition, Ag nanoparticles are believed to play an essential role in affecting the photoreactivity because they are able to trap electrons, further separate the electron–hole pairs, and prolong the life of electron–hole pairs. In other words, it can be concluded that the increased photocatalytic activity of AAC was attributed to the synergic effect between g-C3N4, Ag2O and Ag. It is believed that the present work could render useful information for steering the design and application of noble nanoparticle loaded g-C3N4-based heterojunction composites with high photocatalytic activity.
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 ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 10
·5508-5520
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IF 2.047
Wang Yan,Zheng Zhanshen,Li Yuanliang,Jia Pengwei,Liu Tong
Degradation of harmful pollutants is the key to water pollution control. Herein, a series of BiOI/g-C 3 N 4 -Ag 2 O (BCNA) heterojunction photocatalysts were prepared by a simple liquid-phase synthesis method for photocatalytic degradation of organic pollutants under visible light. The crystal structure, morphology, and elemental composition of the synthesized photocatalysts were characterized by x-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and x-ray photoelectron spectroscopy (XPS). The experimental results showed that compared with g-C 3 N 4 and BiOI, BiOI/g-C 3 N 4 -Ag 2 O composite showed the best photocatalytic activity when the Ag 2 O loading was 14.68 wt.%, and the removal rate of rhodamine B (RhB) could reach 98% after 30 min, and the photodegradation showed good stability through the cycle tests. In addition, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence excitation spectrum (PL), and photoelectrochemical measurements confirmed that the enhanced photoactivity of BiOI/ g-C 3 N 4 -Ag 2 O is due to the formation of ternary heterojunction, which not only amplifies the visible light response of g-C 3 N 4 but also improves the separation and migration rate of photoinduced carriers. Finally, a possible mechanism of charge separation and transfer for ternary heterojunction photocatalysts was proposed. This study extends the application range of g-C 3 N 4 for RhB degradation and provided a new opportunity for environmental remediation.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Tian Xing,Jiawei Wang,Jiayu Zhang,Hao Liu,Lijie Xu,Wen Zhang,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
Ag 2 O-Ag/CH 3 NH 3 PbBr 3 (MAPbBr 3 ) heterojunction composites were synthesized using a strategy that combines one-step spin coating, electron beam evaporation, and laser irradiation. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses confirmed the formation of dense and uniform nanoparticles on the sample surface after laser irradiation, as well as the successful introduction of oxygen vacancies. These nanostructures and oxygen defects contribute to the emergence of a broad plasmonic resonance absorption peak and enhance the local electromagnetic field intensity, thereby promoting stronger nonlinear optical effects. Z -scan results show that the Ag 2 O-Ag/MAPbBr 3 heterojunction composites exhibit strong saturable absorption (SA), in contrast to monolayer Ag 2 O–Ag or MAPbBr 3 , due to efficient interfacial charge transfer that suppresses reverse saturable absorption (RSA) arising from excited-state absorption and multiphoton absorption. The nonlinear optical absorption was effectively tuned by laser irradiation with different pulse widths. The maximum third-order nonlinear absorption coefficient of the heterojunction was measured to be −7.96 × 10 −7 cm/W. In addition, the finite-difference time-domain (FDTD) simulation results were in good agreement with the experimental data. These results indicate that the as-synthesized Ag 2 O-Ag/MAPbBr 3 heterojunction composites have promising potential for applications in nonlinear optical devices.
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高影响因子
TALANTA
·
2023
·
IF 6.1
Feng Luo,Yue Tang,Jia Zheng,Zhengmin Xie,Junjun Wang,Jianli Zhou,Yuangen Wu
Carbendazim (CBZ) is a widely used pesticides, and its excessive intake is serious damage to humans and animals. Herein, a stable and sensitive colorimetric aptasensor for rapid detection of CBZ residue has been established based on the enhancement of CBZ-specific aptamer (CZ-13) on oxidase-mimicking activity of octahedral Ag 2 O nanoparticles (NPs). The CZ-13 aptamer can significantly increase the catalytic activity by promoting the production of superoxide anion (·O 2 − ) on the surface of Ag 2 O NPs and enhancing the affinity of octahedral Ag 2 O NPs to 3,3′,5,5′-tetramethylbenzidine (TMB) molecules. In the presence of CBZ, the quantity of CZ-13 aptamer will be exhausted due to the specific binding to CBZ pesticide. Thus, the rest CZ-13 aptamer no longer enhanced the catalytic activity of octahedral Ag 2 O NPs, which leads to the change in color of sensing solution. The color change of sensing solution can be easily converted to the corresponding RGB value by a smartphone for quantitative and rapid detection of CBZ. The designed aptasensor has excellent sensitivity and specificity, and the limit of detection was determined as low as 7.35 μg L −1 for CBZ assay. Besides, the aptasensor exhibited good recoveries in the spiked cabbage, apple and cucumber, showing that it may have broad application prospects for detecting CBZ residues in agriculture products.
研究领域:
分析化学
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食品科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 25
·11310-11324
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IF 3.553
Ren Hai-Tao,Han Jing,Li Ting-Ting,Liang Yu,Jing Meng-Zhen,Jiang Si-Meng,Lin Jia-Horng,Lou Ching-Wen
Visible light response PAN@Ag–Ag 2 O/TiO 2 (PAN@AT) nanofibers with different mass ratios between Ag–Ag 2 O and TiO 2 were synthesized via a facile electrospinning technique and pH-induced precipitation reaction. X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscope analyses manifest the formation of Ag–Ag 2 O/TiO 2 heterojunctions, and Ag–Ag 2 O/TiO 2 nanoparticles are evenly distributed on PAN nanofibers. The fabricated nanofibers show a highly photocatalytic performance toward As(III) oxidation under visible light, and the conversion is 92.1% after 120-min reaction at pH 5.0 in the system of PAN@AT4. Furthermore, conversion of As(III) can retain 88.6% of the original activity after repeating four cycles, indicating the good recyclability of PAN@AT4 nanofibers. Quenching experiments and electron spin resonance spectra analysis further demonstrate that the predominate active species for As(III) oxidation by PAN@AT4 are h + and · OH. The enhanced catalytic activity of PAN@AT4 is therefore ascribed to the formation of Ag–Ag 2 O/TiO 2 heterojunctions on PAN surface and the efficient separation of photoinduced electron–hole pairs. This study provides a new material to oxidize reducing pollutants [such as As(III)] and also sheds light on the fabrication of recyclable photocatalysts.
研究领域:
材料科学
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环境工程
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纳米技术
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光化学
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产品关联
DOI
高影响因子
CELLULOSE
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2025
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IF 4.8
Liu Weiyu,Qin Mei,Rao Wenhui,Xie Yijun,Yu Chuanbai
With industrialization progressing rapidly, the discharge of printing and dyeing wastewater has risen significantly. This wastewater contains organic dyes like methylene blue (MB), posing a significant risk to the environment and human health. This study reports the successful fabrication of a multifunctional magnetic aerogel (ZACPF) with synergistic adsorption and catalytic properties. The aerogel was prepared by incorporating ZnO/Ag 2 O heterojunctions into a dual-network hydrogel formed by cross-linking cellulose nanofibers (CNFs) and polyvinyl alcohol (PVA), followed by in-situ loading of magnetic Fe 3 O 4 . Experimental results showed that the aerogel has excellent adsorption performance for both cationic (416.34–984.52 mg/g) and anionic dyes (993.83–1025.95 mg/g) at 25 °C with pH 6.5. Characterization analyses confirm that the adsorption mechanism involves multi-site interactions, including electrostatic attraction, hydrogen bonding, and pore filling. When combined with H 2 O 2 , its degradation efficiency for MB at 20 mg/L was significantly enhanced, reaching 85.15% within 120 min at 25 °C with pH 6.5. The band alignment mechanism also facilitated the effective separation of photogenerated carriers, enabling a MB degradation rate of 98.91% under visible light within 60 min. Furthermore, the aerogel exhibited excellent recyclability, maintaining over 79.2% of its initial degradation efficiency after five cycles. In conclusion, this study presents an innovative strategy for developing high-performance aerogel catalysts to treat dye-contaminated water.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 6
·1062-1069
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IF 1.071
Wang Hui,Wang Jiafeng,Zhang Lei,Yu Qinqin,Chen Zewen,Wu Shengji
In the present work, a remarkable combination of non-thermal plasma and photocatalyst was developed to widen the operating temperature window of selective catalytic reduction(SCR) of NO x with CH 4 , especially to improve the low-temperature removal efficiency of NO x . It was shown that the operating temperature window was significantly widened. Among all the catalysts prepared, 1%Ag 2 O/TiO 2 showed the highest catalytic activity for NO x removal due to the utilization of near ultraviolet light. The conversion of NO x to N 2 over the in-plasma 1%Ag 2 O/TiO 2 photocatalyst at 60 and 300 °C could achieve 31.8% and 53.0%, respectively. The combination mode of plasma and catalyst affected NO x removal efficiency greatly, the in-plasma catalysis outperformed the post-plasma catalytic mode remarkably, signifying the contribution of photocatalytic processes on the catalysts. Meanwhile, the characterizations of the catalyst demonstrated that the morphology and structure of the Ag 2 O/TiO 2 catalyst were unchanged throughout the non-thermal plasma and photocatalytic processes, implying the superior stability of the catalyst.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Mengxi Song,Kemin Qi,Yuan Wen,Xiaoli Zhang,Yi Yuan,Xiaoyun Xie,Zhaowei Wang
Direct Z-scheme heterojunctions composed of Ag 2 O nanoparticles and ZnO nanorods were immobilized on Ni foam (AZN) via combined hydrothermal and precipitation methods to successfully construct 3D reticulated composites, and their photocatalytic performance were evaluated under simulated sunlight. Just as expected, the AZN samples exhibited excellent photocatalytic effects of 99.26% for the model pollutant (rhodamine B) in water after loading with Ag 2 O, which was 2.77 times higher than that of regular ZnO NAs/Ni foam composites. Meanwhile, the surface wettability of composite was remarkably enhanced. Besides, a series of photoelectrochemical measurements showed a significant improvement in the charge separation efficiency of AZN, which was attributed to the synergistic effect of direct Z-scheme heterojunction, matched energy band structure as well as 3D porous structure. Moreover, the AZN sample presented satisfactory stability after four cycles, meanwhile it displayed good removal performance against different types of antibiotics (Tetracycline, Sulfadiazine and Ciprofloxacin). The applicability and durability of AZN for rhodamine B degradation were evaluated by sequential batch experiments in a homemade simulated flowing water device. More importantly, the lower value of electrical energy per order indicated the photocatalyst/simulated sunlight system was more energy efficient and effective. Accordingly, this work provided a new strategy for designing 3D reticulated composites with low-dimensional nanomaterials to decompose organic pollutants in impaired waters.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
Food Bioscience
·
2024
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IF 4.8
Lian Xia,Jia Zheng,Jian Su,Hongli Yang,Zhengmin Xie,Yue Tang,Yuangen Wu
Ethyl carbamate (EC) is a small compound produced and stored during fermentation processes from ethanol, urea, citrulline, and carbamoyl phosphate. EC is commonly found in fermented foods and alcoholic beverages. Prolonged exposure to EC can cause nervous system diseases and liver damage in human beings. EC lacks stable physicochemical properties, and the presence of numerous interfering substances in alcoholic beverages poses challenges for its detection. Herein, it is found that EC1-34 aptamer bound to EC can enhance the laccase-like activity of cubic Ag 2 O nanoparticles (NPs). Subsequently, Ag 2 O NPs are wrapped with EC1-34 aptamer to prepare recognition probes, which are immobilized on a carrier membrane. Thus, a portable paper-based sheet for EC detection in Chinese Baijiu is designed. The visual detection limit of the developed paper-based sheet for EC is 10 μg⋅L −1 , and shows an outstanding linear relationship within the range of 10–200 μg⋅L −1 . Moreover, this colorimetric paper-based sheet has a good practicality in various Chinese Baijiu samples. It is believed that such paper-based sheet can facilitate portable inspection for EC in Baijiu, and may also become a beneficial tool for monitoring EC molecules in other fermented foods.
研究领域:
食品科学
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分析化学
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纳米技术
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DOI
高影响因子
MATERIALS & DESIGN
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2023
·
IF 8.4
Shuai Zha,Siyu Pan,Yuehan Jian,Yunhui Peng,Lijun Jiang
Hydrogen sulfide (H 2 S), a third gas signaling molecule, is considered to play a vital role in the development and treatment of diseases. To elucidate the intricate role of H 2 S in the organism and its participation in disease processes, there is an urgent need to visualize the dynamics of H 2 S. However, most currently available molecular probes have limitations in terms of sensitivity, specificity, and precision. In this study, the safe and biocompatible upconversion nanosensor NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 anchored with Ag 2 O was successfully fabricated for H 2 S detection with an ultralow detection limit at 0.93 ng/mL. NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 @Ag 2 S is formed through in situ sulfuration reaction, and second near-infrared (NIR-II) fluorescence can be recorded upon the presence of H 2 S under 808 nm excitation. The results demonstrate the exceptional detection linearity and high specificity for H 2 S quantification. Additionally, NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 @Ag 2 O possesses a safe nature in normal and cancer cells. This nanosensor presents a NIR fluorescence imaging strategy for highly sensitive and specific detection of H 2 S, which has promises to be a practical tool for biomedical applications.
研究领域:
分析化学
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生物医学工程
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纳米技术
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分子生物学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
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IF 6.065
Yannan Chen,Gangqiang Zhu,Mirabbos Hojamberdiev,Jianzhi Gao,Runliang Zhu,Chenghui Wang,Xiumei Wei,Peng Liu
Ag 2 O nanoparticles-loaded Bi 5 O 7 I microspheres forming a three dimensional Ag 2 O/Bi 5 O 7 I p – n heterojunction photocatalyst with wide-spectrum response were synthesized in this study. The results of transmission electron microscopy observations revealed that the Ag 2 O nanoparticles with the diameter of ca. 10–20 nm were distributed on the surfaces of Bi 5 O 7 I nanosheets. The as-synthesized Ag 2 O/Bi 5 O 7 I exhibited an excellent wide-spectrum response to wavelengths ranging from ultraviolet (UV) to near-infrared (NIR), indicating its potential for effective utilization of solar energy. Compared with pure Bi 5 O 7 I, the Ag 2 O/Bi 5 O 7 I composite also demonstrated excellent photocatalytic activity for the degradation of Bisphenol A and phenol in aqueous solution under visible LED light irradiation. Among samples, the 20% Ag 2 O/Bi 5 O 7 I composite photocatalyst showed the highest photocatalytic activity for the degradation of Bisphenol A and phenol in aqueous solution. In addition, the 20% Ag 2 O/Bi 5 O 7 I composite also exhibited a photocatalytic activity for the degradation of Bisphenol A under NIR light irradiation. The improved photocatalytic activity is attributed to the formation of a p - n heterojunction between Ag 2 O and Bi 5 O 7 I, allowing the efficient utilization of solar energy (from UV to NIR) and high separation efficiency of photogenerated electron-hole pairs. The present work is desirable to explore a possible avenue for the full utilization of solar energy.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Jing Chen,Qifang Ren,Chunshan Xu,Bin Chen,Shaohua Chen,Yi Ding,Zhen Jin,Wanmi Guo,Xinyu Jia
In this study, Ag 2 O/BiVO 4 /diatomite composite with p-n heterojunction structure was synthesized by simple hydrothermal method with diatomite as carrier. It was found that under the action of hydrogen peroxide (H 2 O 2 ), the imidacloprid (IMD) could be effectively degraded by the composite. Systemic evaluations was conducted on effects of pH value, catalyst dosage, H 2 O 2 concentration, initial IMD concentration, and anion on how effeciently this new photocatalytic composite can degrade IMD. The results show that the p-n heterojunction formed between the two contact surfaces of Ag 2 O nanoparticle and BiVO 4 promotes the charge transfer between the interfaces, inhibits recombination of electrons and holes, and thus significantly improves the catalytic performance. The stability and reusability of Ag 2 O/BiVO 4 /diatomite composites were tested with ICP experiment and cyclic experiment. Active substance capture experiment and ESR reveal the photocatalytic reaction mechanism and confirm that superoxide radical ( O 2 − ), hydroxyl radical ( OH), and h + can promote the degradation of IMD. The degradation products and the intermediates of IMD were identified through LC-MS, on a basis of which the possible transformation pathway was proposed. In situ synthesis of p-type Ag 2 O and n-type BiVO 4 heterojunction composites has opened a new direction 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
危险品化学品经营许可证（带存储）