RSC Advances
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2015
·Vol. 5
·期 50
·40000-40006
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IF 3.84
Shuaishuai Ma,Jinjuan Xue,Yuming Zhou,Zewu Zhang
Ag2O/g-C3N4 p–n heterojunctions were successfully fabricated by a facile photochemical method and applied as a photocatalyst in the degradation of antibiotic tetracycline hydrochloride (TC-HCl) under visible light irradiation. The samples were well characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results demonstrated that Ag2O nanoparticles with sizes of 5–15 nm were distributed on the surface of g-C3N4 to form the Ag2O/g-C3N4 p–n heterojunctions. The heterojunctions were conducive to the high dispersibility of small Ag2O nanoparticles and the efficient separation of photogenerated electron–hole pairs, resulting in the enhancement of photocatalytic activity by using Ag2O/g-C3N4 heterojunctions as the photocatalyst compared to pure Ag2O and g-C3N4 in TC-HCl degradation. In particular, the degradation rate of TC-HCl was 1.21 and 3.52 times higher than that of pure Ag2O and g-C3N4, respectively. Furthermore, the stability of the Ag2O/g-C3N4 photocatalyst toward the degradation process under visible light irradiation was investigated.
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
·
IF 4.7
Songshan Jiang,Lin Xu,Fan Wu,Rui Wen,Meiling Yang,Bai He,Wei Xiong,Huan Yi
The development of stable and efficient MOF-based photocatalysts is essential for the treatment of high-strength dye wastewater. In this study, Ag/Ag 2 O@MOF-808 surface heterojunction photocatalysts were synthesized by a low-temperature impregnation calcination method. Comprehensive structural analyses (XRD, FT-IR, SEM, TEM, BET, H 2 -TPR, XPS) confirmed successful silver loading without damaging the MOF-808 framework. By adjusting the calcination temperature, both Ag 0 and Ag 2 O were introduced to form surface heterojunctions with MOF-808. UV–vis DRS and valence band XPS showed that Ag 2 O reduced the band gap and valence band position, improving light absorption and charge separation. The optimized catalyst (10 wt% Ag, 150 °C) achieved 98.1 % degradation of Rhodamine B (25 mg/L) under UV light within 60 min and maintained 88.8 % efficiency (within 180 min) at 100 mg/L. The catalyst exhibited excellent reusability with 0.417 % Ag + leaching and over 73 % activity retention after four cycles. Radical scavenging experiments identified superoxide radicals as the dominant reactive species. The enhanced performance is attributed to the synergistic effect of Ag 2 O as the active phase, Ag 0 as a conductive bridge, and MOF-808 as a stable support. This work offers a controllable, oxidant-free strategy for efficient photocatalytic degradation of hazardous dyes in wastewater.
研究领域:
材料科学
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环境化学
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光催化
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废水处理
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金属有机框架材料（MOFs）
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Yan Zhou,Jinlong Wang,Wangni Meng,Lian Xia,Yue Tang,Jianli Zhou,Yuangen Wu,Pengcheng Yan
Acetamiprid (ACE), a neonicotinoid pesticide broadly used in agricultural production, can accumulate in the food chain due to excessive or incorrect use, thereby posing a threat to human health. In this manuscript , a colorimetric aptasensor assisted by a smartphone was established, relying on the S-18 aptamer-mediated amplification of the laccase-mimic activity of spherical Ag 2 O nanoparticles (NPs). The S-18 aptamer strengthens the interaction and facilitates electron transfer between the Ag 2 O NPs and oxidative substrates, which significantly improves the laccase-mimic activity of the Ag 2 O NPs. When acetamiprid is present, the S-18 aptamer preferentially binds to the target molecule, forming a steady aptamer-acetamiprid complex. This binding interaction prevents the aptamer from promoting the catalytic behavior of the Ag 2 O NPs, producing a distinct and quantifiable color variation in the reaction system. Monitoring the concentration-dependent colorimetric response enables the quick and accurate identification of acetamiprid. The colorimetric aptasensor achieved a limit of detection (LOD) of 8.69 μg∙L −1 markedly lower than the maximum residue limits defined by the national standard (GB 2763–2019) for acetamiprid in fruits and vegetables. Furthermore, the aptasensor demonstrates satisfactory recovery rates in actual samples analyses of cabbage, apple, and tomato, confirming its practical potential for on-site food safety oversight.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Jia Tang,Yuanwen Hou,Yuetian Yang,Hongquan Fu,Juan Zhang,Hejun Gao,Jinming Chang,Yunwen Liao
Hydrogen peroxide (H2O2) is a crucial industrial chemical with diverse applications, ranging from disinfection and bleaching to chemical synthesis and environmental remediation. However, conventional H2O2 production methods, such as the anthraquinone oxidation process, face significant challenges, including high energy consumption, environmental concerns, and reliance on hazardous chemicals. To address these issues, there is a growing need for the development of stable, green, and efficient production technologies. Piezoelectric catalysis has emerged as a cutting-edge solution, leveraging piezoelectric materials to convert mechanical energy into chemical energy. This process facilitates the charge separation necessary for redox reactions, offering a promising pathway for the clean and sustainable production of H2O2. In this study, S-type ZnO/Ag2O heterojunctions were synthesized using a precipitation method. This heterojunction demonstrated exceptional catalytic performance, achieving an impressive H2O2 production rate of 346.9 μmol g−1 h−1, surpassing many existing catalysts. A key breakthrough of this research lies in the dual reaction pathway mechanism of H2O2 production. Unlike traditional methods that rely on a single reaction pathway, the ZnO/Ag2O catalyst enables simultaneous H2O2 generation through both the water oxidation reaction (WOR) and the oxygen reduction reaction (ORR). This dual reaction pathway approach significantly enhances the overall yield. This study not only highlights the potential of piezoelectric catalysis as a high-performance method for H2O2 synthesis but also paves the way for further advancements in clean and sustainable chemical production.
研究领域:
材料科学
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催化
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环境化学
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纳米技术
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能量转换
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DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2016
·
IF 2.525
Xinshan Rong,Fengxian Qiu,Zhongtian Jiang,Jian Rong,Jianming Pan,Tao Zhang,Dongya Yang
In current work, a ternary combined ZnO-Ag 2 O/porous g-C 3 N 4 (ZnO-Ag 2 O/pg-C 3 N 4 ) composite photocatalyst was prepared and used for the degradation of ciprofloxacin (CIP) under visible light irradiation. The structure, surface morphology and chemical composition of as-prepared composite photocatalyst are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and Brunauer–Emmett–Teller (BET) methods. From the DRS and PL optical property test, the result indicated that ZnO-Ag 2 O/pg-C 3 N 4 presented relative narrow band gap and higher separation rate of photoinduced charge carriers in the ternary combined system, which was favorable for the photocatalytic activity enhancement under visible light irradiation. Compared with ZnO , porous g-C 3 N 4 , Ag 2 O and ZnO-Ag 2 O, the prepared ZnO-Ag 2 O/pg-C 3 N 4 presents the highest degradation efficiency (97.4%) within 48 min. The degradation intermediates of CIP were detected by HPLC/MS during photocatalytic degradation. Furthermore, porous g-C 3 N 4 as a visible-light-driven photocatalyst used as supporter in the combined system not only improves the degradation efficiency, but also speeds up the reaction rate.
研究领域:
环境科学
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材料科学
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高影响因子
APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Qiang Le,Zhilin Cheng
The higher energy consumption and processing cost greatly constricted the extensive application of the adsorption desulfurization technique. Herein, the nano-Ag 2 O/ZIF-8@ polyacrylonitrile (PAN) nanofiber membrane (NFM) was successfully made by using electrospinning and microwave-assisted synthesis. The characterizations demonstrated that the nano-Ag 2 O-dotted ZIF-8 with the exclusive corncob-like structure uniformly grew on the surface of PAN nanofiber. The in-situ fabrication of nano-Ag 2 O/ZIF-8 on the surface of PAN nanofiber was rapidly realized by microwave-assisted method, thus resulting in the less loss of the mechanical performance of NFM. The tests indicated that the tensile strength and young's modulus of Ag 2 O/ZIF-8@PAN NFM were 35 % and 185 % higher than PAN NFM, respectively. The fabrication of the multi-pore structure endowed the Ag 2 O/ZIF-8@PAN NFM to achieve the superior adsorption performance for thiophene (TH) from fuel oil, having the increase by 312 % and 175 % in the batch adsorption (maximum: 37.142 mg·g −1 ) and fixed-bed breakthrough adsorption (maximum: 35.423 mg·g −1 ) capacities compared to PAN NFM, respectively. Furthermore, the saturated adsorption capacity of Ag 2 O/ZIF-8@PAN NFM in fixed-bed adsorption experiment was higher than those of Cu 2 O-doped PAN NFM (4.571 mg·g −1 ) and Ag 2 O@HNTs-doped PAN NFM (31.982 mg·g −1 ) reported by our previous study. The adsorption mechanism of TH molecules on the Ag 2 O/ZIF-8@PAN NFM was explored by the kinetics, intra-particle diffusion, isotherms and thermodynamic models, which affirmed to exist the synergistic effect of physical adsorption, and chemical adsorption including π-complexation interaction and S-M interaction adsorption. Finally, this work provided a novel prospective adsorption desulfurization based on the membrane separation.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
Food Packaging and Shelf Life
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2025
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IF 10.6
Xin Ding,Yiming Zhao,Xin Chen,Yanyan Huang,Zhihao Lin,Jing Wang,Ge Chen,Guangyang Liu,Xiaomin Xu,Bining Jiao,Xijuan Zhao,Donghui Xu
Chitosan film is frequently used to preserve food. However, the stability of chitosan film is poor, so it is crucial to strengthen the stability, anti-ultraviolet, antibacterial activity, anti-oxidation and continuous fresh-keeping activity of chitosan film. In this work, paeonol@ZIF-8 and Ag 2 CO 3 /Ag 2 O nano-heterojunctions were dispersed into chitosan/kudzu-based solution by matrix mixing and solution casting method, which successfully prepared a biodegradable nanocomposite film and used it for preservation of raspberry. Moreover, ZIF-8 provided a large number of active sites to PAE. The loading rate of PAE@ZIF-8 was 36.33 ± 0.82 % by a simple one-pot process. The paeonol@ZIF-8 had the effect of slow release in different food environments and intelligent response to pH. The Ag 2 CO 3 /Ag 2 O nano-heterojunctions also cooperated to inhibit bacteria by releasing silver ions. Meanwhile, the physical and chemical properties of chitosan film were improved, which could make it more suitable for food packaging. The improved film could block 90.32 % of UV–visible light. Moreover, its antioxidant and antibacterial properties were increased by 1.24 times and 4 times, respectively. It could extend the shelf life of raspberries to 5 days as the hydrophobic film. The nanocomposite film also effectively maintained cucumber slice quality. It also found that the migrating silver ion content of raspberry and cucumber slice complied with EU food safety law regulations. Importantly, the nanocomposite film was degradable and did not affect the germination and growth of the seed. Our work provides a sustainable multifunctional food packaging material that can be used to preserve perishable foods.
研究领域:
食品科学
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材料科学
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纳米技术
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高分子科学
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农业工程
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
·
IF 4.3
Dejing Meng,Linchun Nie,Wenjing Liu,Rui Yang,Haobo Yang,Junlong Li,Ranhao Zhao,Shaojie Su,Qingxiang Zhou
The inappropriate administration of lincomycin hydrochloride (LIN) will lead to severe side effects. It is critically essential to establish LIN effective detection technique. In this work, a new nanozyme Cu-BDC@Ag 2 O was synthesized by hydrothermal method, which was composed of metal organic framework (Cu-BDC, with copper ion as metal center and 2-aminoterephthalic acid as organic ligand) and Ag 2 O, exhibiting enhanced oxidase-like activity (K m = 0.70 mM, V max = 42.53 × 10 −8 M s −1 ) and laccase-like activity. This enhanced activity was attributed to the interconversion between Cu + /Cu 2+ valence states and the synergistic effect between Ag and Cu elements. The superoxide anion radical ( O 2 – ) produced during the catalytic process of Cu-BDC@Ag 2 O can swiftly oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue oxidation product (oxTMB). The methylthio group in LIN molecules reacted with Ag + in the nanozyme, forming a stable complex that inhibited the catalytic activity of Cu-BDC@Ag 2 O, causing discernible fading of the blue coloration. Based on this, a smartphone-assisted chromogenic detection system was established for LIN quantification. The linear range extended from 3.42 to 171 μM, with a detection limit of 3.14 μM. Moreover, the colorimetric sensing platform demonstrated promising results in the analysis of real samples with spiked recoveries in the range of 94.1–100.9 % and relative standard deviations lower than 8.0 %, and validated LIN content compliance with commercial ophthalmic solutions against pharmacopeial specifications. The developed colorimetric sensor demonstrated rapid response (4 min) and superior efficiency, offering a portable tool for LIN detection.
研究领域:
分析化学
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纳米技术
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生物传感器
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环境监测
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药物分析
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4227-4243
·
IF 1.674
Deng Anquan,Zhu Yufu
TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres have been synthesized via a low-temperature hydrothermal method using SiO 2 spheres as templates, combined with a light-induced reduction method and a hydrogen peroxide oxidation process. Scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses have demonstrated that Ag and Ag 2 O nanoparticles were successfully deposited on the surfaces of TiO 2 /SiO 2 nanocomposite spheres and porous TiO 2 nanospheres forming nanoheterojunctions. The photocatalytic experiment results reveal that all the as-prepared catalysts possess improved photocatalytic activities compared with P25 nanoparticles. Both TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres exhibit excellent photocatalytic performances, which can be attributed to the synergistic effects of different kinds of nanoparticles. The synergistic mechanism of these nanoparticles is also discussed in detail.
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 Catalysis
·
2022
·
IF 13.7
Dongmiao Li,Jinni Shen,Jiangjie Zhang,Yao Chai,Yanyu Xie,Chengwei Qiu,Mengmeng Ni,Yuanhui Zheng,Xuxu Wang,Zizhong Zhang
The development of direct conversion for selective functionalization of inert methane plays an important role in the chemical sciences. Here, we report a photocatalytic approach to successfully convert methane into methyl chloride over NaTaO3 photocatalyst using an alkali chloride solution as the chlorine source under ambient conditions, which can overcome disadvantages of toxicity and corrosiveness in the traditional chlorination of methane. Various noble metals and oxide cocatalysts (Pt, Pd, Au, Ag, and Ag2O) and different chloride ion solutions (NaCl, KCl, LiCl, MgCl2, BaCl2, CaCl2, CuCl2, FeCl3, ZnCl2, etc.) are investigated to optimize the photocatalytic chlorination processes. Ag2O/NaTaO3 is the best photocatalyst, giving the maximum CH3Cl yield of 152 μmol g–1 h–1 in aqueous NaCl solutions and an apparent quantum yield of 7.2% under 254 nm monochromatic light irradiation. The target product CH3Cl is verified to be formed by a direct combination of the photoinduced species •CH3 and •Cl on the Ag2O surface. This work provides a meaningful approach for the conversion of methane into chloromethane under normal conditions.
研究领域:
化学科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunni Liu,Qian Li,Zichao Lian,Jinchen Fan,Ying Tao,Guisheng Li,Hexing Li
Polarization field introduced photoelectrocatalytic system has been raised and applied for environmental purification and green fuel generation. Herein, we synthesized the Ag 2 O/TiO 2 nanotubes arrays (TNTs) p - n heterojunction photoanodes and innovatively introduced the SrTiO 3 (STO) as a relay to construct a highly stable PEC system. The SrTiO 3 layers with the ferroelectric properties were inserted in the interfaces between p-Ag 2 O and n-TiO 2 , creating a charge-stable polarized electric field thereby maintaining a constant driving force that promoted the effctive separation of electron and hole between SrTiO 3 and TNTs, and prevented the electron transfer from SrTiO 3 to Ag 2 O. Controlling suitable annealing and regulating hydrothermal time could induce SrTiO 3 spontaneous polarization, resulting in effective photoinduced charge separation. Consequently, the as-designed TNTs/STO/Ag 2 O photoanodes exhibited excellent PEC activity and stability (>40 h) for both persistent organic pollutants degradation and synergistic hydrogen evolution owing to the strengthened charge carrier capture ability of solar light and improved photocurrent density.
研究领域:
环境科学
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材料科学
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能源科学
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高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 24
·16651
·
IF 4.614
Nan Yang,Zhihan Zhang,Shicheng Zhang,Liting Chen,Jia Zhu,Jingsi Gao
In order to improve the catalytic activity and recycling performance of semiconductor activators, and improve the activation pathway of persulfate, graphitic carbon nitride (g-C3N4) was prepared by calcining melamine, and a composite activator Ag2O/g-C3N4based on g-C3N4supported metal oxide was prepared using a precipitation method. The morphology, structure, and basic properties of the composites were characterized using SEM, XRD, FT-IR and XPS. The activation efficiency of the Ag2O/g-C3N4composite activator on peroxodisulfate (PDS) was explored. The results showed that Ag2O in the composite activator was highly dispersed on the surface of g-C3N4and did not change the molecular structure of g-C3N4significantly. Under different activation systems, the degradation process of MO was best fitted under the pseudo-second-order reaction kinetic model, compared to the separate g-C3N4or Ag2O activated PDS systems; the activation of the PDS system with Ag2O/g-C3N4had the best effect on MO degradation; and the composite activator Ag2O/g-C3N4showed better activation performance. Under the conditions that the mass combined ratio of Ag2O in the activator was 12%, the initial concentration of PDS was 4 mmol/L, the initial concentration of the activator was 1.25 g/L, and the initial pH was 3, the degradation degree of MO reached 99.4% after 40 min reaction. The free radical quenching experiment proved that the active substances that could degrade MO in the system were SO4−· and ·OH, and the effect of SO4−· was greater than that of ·OH. The degradation degree of MO in the reaction system remained above 80% after four cycles of use, and the crystal structure of Ag2O/g-C3N4did not change significantly before and after the reaction. The above results show that Ag2O/g-C3N4is an efficient and stable composite activator with good application potential in the treatment of dye wastewater by activating PDS.
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
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