APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Yanyang Shang,Xi Chen,Wenwen Liu,Pengfei Tan,Haoyun Chen,Laidi Wu,Cheng Ma,Xiang Xiong,Jun Pan
A facile microemulsion-assisted co-precipitation method was carried out to synthesize nano-sized Ag 2 CrO 4 highly dispersed on the surface of porous g-C 3 N 4 as high-efficiency visible-light-driven composite photocatalysts for the first time. The structure and morphology of the composites were systematically characterized by various techniques. Compared with Ag 2 CrO 4 and g-C 3 N 4 , g-C 3 N 4 /Ag 2 CrO 4 composites showed a dramatically increased photocatalytic activity in degradation of rhodamine B (RhB) and methylene blue (MB). The optimum mass ratio of the Ag 2 CrO 4 to g-C 3 N 4 was about 30 wt%, the degradation rate of which were 6.1 (7.9) and 9.7 (15.2) times higher than pure Ag 2 CrO 4 and g-C 3 N 4 in RhB (MB) degradation, respectively. The excellent photocatalytic activity and stability mainly benefited from the synergistic effect including smaller Ag 2 CrO 4 particle size, high specific surface area of the composites and matched band potentials which not only promoted the separation of photon-generated charge carriers, but also inhibited the photocorrosion of Ag 2 CrO 4 . Further study revealed that the photocatalytic mechanism followed a Z-scheme which provided an efficient transfer pathway for charge carriers meanwhile endowed the composites with strong oxidation and reduction ability. Hence the porous g-C 3 N 4 /Ag 2 CrO 4 composites are potential in environmental purification.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20959-20967
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IF 2.324
Wu Xiang-Feng,Zhang Chen-Xu,Wang Yu-Duan,Su Jun-Zhang,Zhang Jia-Rui,Feng Yan-Mei,Zhang Mi,Tong Xin,Zhang Wei-Guang,Sun Xiu-Guo
The Ag 2 CrO 4 /SnO 2 n–n type heterojunction has been fabricated by coupling Ag 2 CrO 4 particles with SnO 2 nanorods via an in situ synthetic method. The photocatalytic degradation mechanism of the as-prepared heterojunction has also been discussed. Characterization results revealed that the as-fabricated Ag 2 CrO 4 /SnO 2 composites could reinforce the photo-degradation competencies for rhodamine B dilute solution compared to pure Ag 2 CrO 4 and SnO 2 samples. As the increase in the molar ratios of Ag 2 CrO 4 –SnO 2 , the photocatalytic degradation efficiency appeared to the tendency of first increasing and then decreasing. When it was 4:10, in 90 min, the as-obtained samples possessed the vintage photocatalytic degradation efficiency of 95.8% among of pure SnO 2 , Ag 2 CrO 4 and the as-prepared composites with various molar ratios, respectively. Furthermore, the Ag 2 CrO 4 and SnO 2 were connected via chemical bonds to form the homogenous heterojunction. It could boost the separation and transfer of the photogenerated holes and electrons. In addition, the holes, hydroxyl and superoxide radicals played a major role during the photodegradation process.
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
CHEMICAL PHYSICS
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2025
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IF 2.4
Yusong Pan,Shuhuan He,Linjie Ou,Shihui Zang,Run Huang
Photocatalytic technology is one of the most promising technologies for wastewater treatment. In this paper, Ag 2 S/Ag 2 CrO 4 core–shell heterojunction were prepared using in-situ anion exchange method. The structure, morphology, and optical properties of the prepared samples were characterized by XRD, SEM, TEM, XPS, and DRS technologies. The photo-degradation results verified that the 2 %-Ag 2 S/Ag 2 CrO 4 heterojunction exhibited excellent photocatalytic activity for degradation of organic dyes and antibiotics under visible light irradiation. The removal efficiency for RhB was 95 % in 15 min, which was obviously superior to that of pure Ag 2 CrO 4 (∼73 %) and Ag 2 S (∼7%) photocatalysts. The enhanced photocatalytic performance of the Ag 2 S/Ag 2 CrO 4 was mainly attributed to the Z-scheme core–shell heterojunction structure of the photocatalyst that facilitated excellent charge carriers separation and migration. Meanwhile, the results of trapping experiments for active species demonstrated that both the holes (h + ) and superoxide radical ( O 2 − ) played an important role for degradation of organic pollutants.
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
Catalysts
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2023
·Vol. 13
·期 5
·817
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IF 3.9
Haoyu Yuan,Chao Zhang,Wenjing Chen,Yuzhou Xia,Lu Chen,Renkun Huang,Ruiru Si,Ruowen Liang
Metal–organic frameworks (MOFs) are new porous materials composed of metal centers and organic ligand bridges, which received great attention in the field of photocatalysis. In this work, Ag2CrO4@MIL–125(Ti)–NH2(denoted as AgCr@M125) Z–scheme heterojunctions were synthesized via a simple microemulsion method, by which highly dispersed nano–sized Ag2CrO4can be anchored uniformly on the surfaces of porous MIL–125(Ti)–NH2(denoted as M125). Compared with pure M125 and Ag2CrO4, the as–prepared AgCr@M125 hybrids show significant photocatalytic efficiency against inactivatedStaphylococcus aureus(S. aureus), reaching over 97% inactivation of the bacteria after 15 min of visible light irradiation. Notably, the photocatalytic activity of the obtained 20%AgCr@M125 is about 1.75 times higher than that of AgCr–M125, which was prepared via a traditional precipitation method. The enhanced photocatalytic antibacterial activity of the AgCr@M125 photocatalytic system is strongly ascribed to a direct Z–scheme mechanism, which can be carefully discussed based on energy band positions and time–dependent electron spin response (ESR) experiments. Our work highlights a simple way to enhance the antibacterial effect by coupling with Ag2CrO4and M125 via a microemulsion–assisted strategy and affords an ideal example for developing MOFs–based Z–scheme photocatalysts with excellent photoactivity.Keywords:MIL–125(Ti)–NH2;Ag2CrO4;S. aureus;Z–scheme;microemulsion method
研究领域:
材料科学
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环境科学
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微生物学
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DOI
高影响因子
VACUUM
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2024
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IF 3.8
Ying Du,Juan Li,Xinqi Ma,Quanhui Guo
With the development of economy, overuse of antibiotics has been seen as a huge threat to human health. Photocatalytic degradation is an effective method for resolving this problem at present. The method of combining plasmon resonance effect and Z-scheme heterojunction can effectively improve the separation efficiency of photogenerated carrier, which is of great significance for the treatment of antibiotic wastewater. Herein, the Ag/Ag 2 CrO 4 /g-C 3 N 4 catalyst was prepared by in-situ loading and photo-reduction method for the degradation of antibiotic wastewater containing tetracycline and quinolone antibiotics . The research results showed that mesoporous graphitized carbon nitride (denoted as g-C 3 N 4 ) provided good support for Ag and Ag 2 CrO 4 nanoparticles , and mesoporous composite Ag/Ag 2 CrO 4 /g-C 3 N 4 (denoted as ACO /CN) provided more reaction sites for organic pollutants degradation. Under visible light irradiation, 5%ACO/CN catalyst showed the best degradation activity and stability for tetracycline (TC), levofloxacin (LVFX), oxytetracycline hydrochloride (OTC) and norfloxacin (NFLX), and their degradation rate constants were respectively 5.66, 8.26, 11.72 and 15.97 times of Ag 2 CrO 4 which indicated it had good potential application value in the treatment of wastewater containing various organic pollutants. This benefits from the plasmon resonance effect of silver effectively improves the utilization efficiency of visible light and the Z-scheme heterojunction between Ag 2 CrO 4 and g-C 3 N 4 promotes the rapid transmission of photogenerated carriers. Based on the experimental results, the possible TC degradation pathway and photocatalytic mechanism were proposed. This study provides a simple way for the successful design and preparation of plasmon resonance effect synergistic Z-scheme heterojunction with promising applications in the treatment of antibiotic wastewater.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 9
·097508
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IF 4.386
Xiaomin Guo,Pinghua Chen,Hualin Jiang,Xiaoqiu Tang,Yiping Huang,Guanghui Wu,Jian Zhang
Due to the strong toxicity of heavy metal ions to public health and the environment, it is a great challenge to develop a method for ultra sensitive capture and determination of heavy metal ions effectively. Herein, a novel heterostructure composite (MIL-53(Fe)/Ag2CrO4, named MA(1:x)) was prepared by a simple method successfully. MA(1:x) modified GCE was applied to detect heavy metals ions simultaneously. Significantly, the designed MA(1:1)/GCE sensors performed outstanding detection performances. The wide ranges of 7.49 ∼ 320.00 μmol l−1 and 7.49 ∼ 320.04 μmol l−1 are obtained for Pb(II) and Cu(II) ions, respectively. The LOD of the MA(1:1)/GCE sensor was determined to be 27.40 nmol l−1 (5.68 ppb) for Pb(II) and 86.96 nmol l−1 (5.52 ppb) for Cu(II) ion simultaneously, which are lower than the allowable level of drinking water stipulated by the World Health Organization (WHO). Possible detection mechanism by the MA(1:1)/GCE was discussed. The MA(1:1)/GCE was successfully applied to monitor heavy metal ions locate in tap and river water. The recoveries are in the range of 93.86%–104.4%, which further proves the potential in analyzing real samples. Moreover, the MA(1:1)/GCE also showed excellent stability, selectivity, reproducibility. A novel method was provided to construct sensitive sensors for simultaneous analysis of different metal ions.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Wen Jiang,Jia Zheng,Jian Su,Yue Tang,Yuangen Wu,Yating Cao,Wentao Cao
Colorimetric methods have the benefits of rapid detection and easy operation in dimethoate (DMT) analysis. However, the existing colorimetric sensor for DMT detection still face challenges in terms of performance stability and result reliability of sensing materials. Bimetallic Ag 2 CrO 4 nanoparticles (NPs) have been found to have both oxidase-mimic and laccase-mimic catalytic activities. DMT has opposite effect on the above dual-enzyme-mimic activities, which can enhance oxidase-mimic activity while inhibiting laccase-mimic activity of Ag 2 CrO 4 NPs. Therefore, a novel colorimetric sensor was constructed using the dual-enzyme-mimic activities as a sensing signal for rapidly detecting DMT in vegetables. The concentration of DMT is directly correlated with the absorbance change of the sensing solution, and the color change is further integrated with the smartphone to enable quantitative measurement of DMT. The limits of detection were as low as 8.7 μg L −1 in the oxidase-mimic channel and 10.9 μg L −1 in laccase-mimic channels. Besides, the colorimetric sensor has shown marked preference in selectivity over other competing pesticides, and obtained relatively preferable recovery rates in some vegetables, indicating that the established sensor has a wide range of potential applications in the area of vegetable pesticide detection.
研究领域:
分析化学
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食品安全
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纳米技术
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农药检测
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 24
·10435-10452
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IF 3.553
Zhang Kailian,Zhou Man,Yu Changlin,Yang Kai,Li Xiaoxiao,Yang Shi,Guan Jie,Dai Wenxin,Huang Weiya
Wide spectral responsive photocatalysts are of great importance for making full use of solar energy and broad application in highly efficient photocatalytic wastewater treatment, production of H 2 O 2 , etc. Thereinto, it is significative to open an appropriate way to extend the absorption to the NIR region, in which it accounts for ~ 49% in the solar spectrum. In this work, we synthesized successfully the new-style NaYF 4 :Yb 3+ , Er 3+ /Ag 2 CrO 4 photocatalyst via the hydrothermal and followed precipitation method, and it exhibited the more excellent photocatalytic performances than Ag 2 CrO 4 for the photocatalytic H 2 O 2 production and disposals of pollutants, such as methyl orange (MO), methylene blue (MB), rhodamine B (RhB) and tetracycline (TCs). The morphological, structural and optical behavior were investigated by XRD, SEM, N 2 adsorption/desorption, TEM, XPS, UV–Vis DRS, UC luminescence and photoelectrochemical experiments. It revealed that NaYF 4 :Yb 3+ , Er 3+ /Ag 2 CrO 4 photocatalyst presented stronger absorptive capacity in the visible–NIR region by the benign fluorescence resonance energy transfer (NaYF 4 :Yb 3+ , Er 3+ can convert near-infrared light to visible light via upconversion process), and showed more efficient charge transfer and separation than that of pure Ag 2 CrO 4 . The primary reactive species of ·O 2 − and h + by the trapping experiments played a considerable important role in the photocatalytic process. A promising potent system was suggested for the highly efficient utilization of sunlight in the enhancement of photocatalytic activities.
研究领域:
材料科学
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环境科学
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光化学
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太阳能利用
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Bo Peng,Yue Lu,Jun Luo,Ziling Zhang,Xu Zhu,Lin Tang,Lingling Wang,Yaocheng Deng,Xilian Ouyang,Jisui Tan,Jiajia Wang
A visible light self-powered photoelectrochemical (PEC) aptasensor based on silver chromate particles, graphitic carbon nitride nanosheets and graphene oxide sheets (Ag 2 CrO 4 /g-C 3 N 4 /GO) for the ultrasensitive detection of chloramphenicol (CAP) was reported in this work. g-C 3 N 4 was considered to be the fundamental photoelectric material because of its great oxidation ability of photogenerated hole as well as excellent biocompatibility and low toxicity. However, the narrow light absorption range and rapid carrier recombination rate limit the application of pure g-C 3 N 4 . Herein, Ag 2 CrO 4 and GO as photosensitizer were introduced to improve the photoelectric properties of g-C 3 N 4 . The photocurrent of the developed ternary composite was about 3 times higher than that of pristine g-C 3 N 4 , which proves it can be used as a suitable photoelectric active material. Moreover, the mechanism of Z-scheme electron transfer path was proved by density functional theory (DFT) calculation. The fabricated PEC aptasensor exhibited high sensitivity toward CAP with a wide liner response of 0.5 pM to 50 nM and a detection limit of 0.29 pM. The specific recognition mechanism and excellent sensing performance indicated this aptasensor could serve as a useful tool for selective and ultrasensitive CAP detection in practical analysis.
研究领域:
分析化学
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材料科学
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生物传感
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DOI
PubMed
高影响因子
Catalysis Science & Technology
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2026
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IF 4
Xianfeng Zhang,Hao Zhang,Jingbo Lu,Sun Zhao,Jianjian Cheng,Han Zhou,Yuting Liang
This study reports the successful fabrication of a novel ternary heterojunction photocatalyst, denoted as CBA (g-C3N4/BiOI/Ag2CrO4), featuring a double Z-scheme charge transfer pathway aimed at the effective degradation of the toxic azo dye Sudan red III under visible light. The synthesis commenced with the fabrication of porous g-C3N4 via calcination coupled with a subsequent etching process. BiOI nanospheres were then grown onto the g-C3N4 substrate via a hydrothermal route. Subsequently, Ag2CrO4 nanoparticles were anchored on the g-C3N4/BiOI composite via a straightforward precipitation technique. The experimental evidence confirms successful formation of a ternary heterojunction, which exhibits a mesoporous structure and enhanced visible-light absorption. Evaluation of photocatalytic performance revealed that the optimized CBA catalyst (containing 30% g-C3N4/BiOI) attained a Sudan red III degradation efficiency of 82.37% under 90 min visible-light irradiation, with a pseudo-first-order rate constant of 0.01944 min−1. This constant value is 31.35 times that of the binary g-C3N4/BiOI system and 1.99 times that of individual Ag2CrO4. The remarkable photocatalytic enhancement is attributable to the established dual Z-scheme mechanism. This configuration effectively facilitates photogenerated charge separation, broadens visible-light absorption, and maintains high redox potentials. Thus, this work advances the design of efficient g-C3N4-based heterojunction systems, offering a viable strategy for photocatalytic purification of dye wastewater.
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DOI
高影响因子
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