MATERIALS SCIENCE FORUM
·
2021
·
IF 0
Di Xiang,Chang Long Shao
A simple route has been developed for the synthesis of Ag2O/ZnO heterostructures and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and photoluminescence (PL) spectroscopy analysis. Considering the porous structure of Ag2O/ZnO, the photocatalytic degradation for the organic dyes, such as eosin red (ER), methyl orange (MO), methylene blue (MB) and rhodamine B (RhB), under visible light irradiation was investigated in detail. Noticeably, Ag2O/ZnO just took 40 min to degrade 96 % MB. The rate of degradation using the Ag2O/ZnO heterostructures was 2.3 times faster than that of the bare porous ZnO nanospheres under visible light irradiation due to that the recombination of the photogenerated charge was inhibited greatly in the p-type Ag2O and n-type ZnO semiconductor. So the Ag2O/ZnO heterostuctures showed the potential application on environmental remediation.
研究领域:
材料科学
·
环境科学
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DOI
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Dafeng Zhang,Changhua Su,Hong Li,Xipeng Pu,Yanling Geng
Ag 2 O/K 0.5 Na 0.5 NbO 3 (Ag 2 O/KNN) piezophotocatalysts with different weight ratios of Ag 2 O to KNN were synthesized by a facile two-step method involving hydrothermal and precipitation methods. Ag 2 O particles were attached on the surface of KNN via a precipitation method. Ag 2 O/KNN composites exhibit better photoactivity than pure Ag 2 O and KNN under visible light irradiation. Moreover, under both irradiations of visible light and ultrasound, the piezophotocatalytic activity was further enhanced in comparison with photoactivity. Based on the experimental results, the improved piezophotocatalytic activities of Ag 2 O/KNN composites should be attributed to the formation of p-n heterojunction between Ag 2 O and KNN and the generation of external electric field of KNN, which leads to high separation rate of photo-induced charges. The photostability and corresponding piezophotocatalytic mechanism were discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Ying Wang,Na Bi,Hao Zhang,Wen Tian,Tao Zhang,Pan Wu,Wei Jiang
In this study, a photocatalysis-assisted adsorption process was proposed to remove a typical azo dye , Congo red (CR), from wastewater, using Ag 2 O. The organic dyes were adsorbed using Ag 2 O, and photodegraded in situ under visible light irradiation, thus, eliminating the desorption step. The results indicated that the maximal adsorption capacity of Ag 2 O for CR reached 180.8 mg/g at the initial CR concentration of 300 mg/L and pH 7. The adsorption of CR could be described using the Langmuir equation, and obeyed the pseudo-second-order kinetic expression. The CR adsorbed by Ag 2 O was completely photodegraded in 35 min to regenerate the Ag 2 O adsorbent under visible light irradiation, and only a slight decrease in the performance of Ag 2 O was observed after four cycles. This photocatalysis-assisted adsorption process could be extended to other azo dyes including acid orange 7 and amido black 10B , but could not be applied to non-azo dyes such as rhodamine B and methylene blue . This adsorption behavior difference was ascribed to the similar molecular orbital structures of Ag 2 O and azo dyes.
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
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chuanfeng Zang,Xiangye Han,Hao Chen,Haifeng Zhang,Yonggang Lei,Hongchao Liu,Chunxia Wang,Guangyu Zhang,Mingzheng Ge
ZnO has been widely employed in the photodegradation of pollutants; however, it exhibits poor photocatalytic performance under visible light illumination. Thus, visible-light-driven heterostructured PVDF/ZnO/Ag 2 O photocatalysts were fabricated by combining the electrospinning, hydrothermal, and in situ deposition techniques. As matrix materials, it is easy to recycle and reuse electrospun PVDF nanofibers . ZnO nanorods anchored on PVDF nanofibers with a high specific surface area provide an abundance of photocatalytically active sites. As a photosensitizer , silver oxide nanoparticles enhance the visible-light photocatalytic efficiency. Thus, the composited PVDF/ZnO/Ag 2 O photocatalysts exhibit excellent photocatalytic performance under both UV and visible light irradiation as a result of the enhanced electron-hole separation/transfer and broadened visible light absorption range. Under visible light irradiation, the kinetic constant of PVDF/ZnO/Ag 2 O nanocomposites is 24.4 and 6.73 times greater than that of PVDF/Ag 2 O and PVDF/ZnO, respectively. Moreover, the PVDF/ZnO/Ag 2 O nanocomposites exhibit advantages in recycling and reusing with high stability, thus considerably widening their practical applications in the field of environmental remediation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 73
·期 2
·314-321
·
IF 1.547
Jiang Bo,Jiang Liangliang,Shi Xuewei,Wang Wenchao,Li Guisheng,Zhu Fengxia,Zhang Dieqing
Ag 2 O/TiO 2 nanorods heterojunctions were synthesized by an environmentally benign approach, including hydrothermal treating TiCl 4 aqueous solution for the formation of rutile TiO 2 nanorods and precipitating Ag 2 O quantum dots on the surface of rutile TiO 2 nanorods. The as-obtained Ag 2 O quantum dots were highly uniformly deposited on the surface of rutile TiO 2 rods for the formation Ag 2 O/TiO 2 heterojunctions photocatalyst. Such photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 adsorption desorption, UV–Vis diffuse reflectance spectroscopy. The photocatalytic activities of the samples were evaluated by phenol under visible-light irradiation. It was found that the optimal Ag:Ti molar ratio (4:10) contributed the highest photocatalytic performance for removing phenol (10 mg/L) with a degradation rate of 66 %, about 11 and 5 times of that of the pure rutile TiO 2 nanorods and N-doped TiO 2 , respectively, after 40 min of reaction under visible light irradiation (λ > 420 nm). Such greatly enhanced photocatalytic performance of the as-prepared photocatalysts was attributed to the strong Ag 2 O/TiO 2 heterojunctions, 1D rutile TiO 2 architecture, and high visible light absorption capability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Rui Li,Yingying Cai,Shuoyang Liang,Aikelaimu Aihemaiti,Zuotai Zhang
Constructing heterojunctions in a rational and effective way plays a vital role in enhancing the catalytic performance of piezo-/ferroelectric nanomaterials. In this paper, a new material called Ag 2 O@KNbO 3 was fabricated using solvothermal and alkaline deposition methods. This material was found to be an effective catalyst for breaking down various organic pollutants, for example, Orange Ⅱ, Methyl orange, etc. Under optimal conditions, Ag 2 O@KNbO 3 (1:1) demonstrated superior piezocatalytic activity with a degradation efficiency of 97.8% for Orange II within 120 min and a high TOC removal efficiency of 58.4%. The cycle stability for Orange II removal was also excellent. After 5 cycles, the degradation efficiency of Orange II still surpassed 95%. The related enhancement mechanism of the piezocatalytic activity was elaborated in detail, with Ag 2 O/KNbO 3 heterojunctions promoting directed charge movement, reducing impedance of charge transport, and hindering electron-hole recombination, thereby improving charge transfer efficiency. Additionally, OH was confirmed to be the primary active species by electron spin resonance analysis and free radical capture experiment. Notably, a possible degradation pathway of Orange Ⅱ was inferred according to the LC-MS measurement. Overall, this study provides a promising approach for designing and synthesizing new piezoelectric catalytic materials.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Industrial Textiles
·
2022
·
IF 2.926
Jing Han,Hai-Tao Ren,Ting-Ting Li,Bing-Chiuan Shiu,Yong-Gui Li,Jia-Horng Lin,Ching-Wen Lou
Visible light response PAN@Ag-Ag2O/Sch (PAN@AS, schwertmannite and polyacrylonitrile abbreviated as Sch and PAN) nanofibers with different mass ratios were synthesized by electrospinning technology and pH-induced precipitation reaction. X-Ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy analysis showed that the formation of Ag-Ag2O/Sch heterojunction and Ag-Ag2O nanoparticles were evenly distributed on the surface of Sch. The prepared nanofibers have high oxidative removal performance for As(III) under visible light. In the PAN@AS0.10 system, the total As removal percent can reach 90.96% after 120 min irradiation at pH 4.0. The scavenger experiments confirmed that the main active substances of the PAN@AS0.10 system were h+ and •OH. The high oxidation and removal performance of the PAN@AS0.10 composite for As(III) was attributed to the effective separation of photogenerated electron-hole pairs and high adsorption capacity of Sch for As under acidic conditions. This research provides a new material for the oxidation and removal of pollutants in water [such as As(III)] and also provides a research basis for the preparation of recyclable photocatalysts.
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
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Xiuling Xue,Xiuwen Gong,Xiaoyi Chen,Bor-Yann Chen
In recent years, environmental pollution caused by volatile organic compounds (VOCs) has posed a great challenge to environmental protection. This first-attempt study provided a novel facile chemical precipitation-reduction method to construct Ag/Ag 2 O@TiO 2 (A/AO@TO) photocatalyst for the removal of gaseous toluene. The introduction of Ag in the presence of NaBH 4 with N 2 purging inhibited the passivation of Ag 2 O and thus enhanced the stability of A/AO@TO. A/AO@TO exhibited outstanding photocatalytic performance toward gaseous toluene under different light sources like UV light , simulated sunlight and natural light, which were 99.3%, 48.3% and 28.5%, respectively. The superior photocatalytic performance could be attributed to the synergy effect of p-n heterojunction between Ag 2 O and TiO 2 and the surface plasmon resonance (SPR) effect of Ag, which facilitate the separation of charge carriers and thus suppress the recombination rate of them, and enhance the light response. The active species like ·OH, ·O 2 − and h + were contributed to the excellent photocatalytic performance. The study provided a new method for the fabrication of A/AO@TO photocatalyst and introduce p-n scheme A/AO@TO as a feasible natural sunlight photocatalyst for further applications.
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
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 22
·1-21
·
IF 2.8
Nazir Ahsan,Huo Pengwei,Jagirani Muhammad Saqaf,Akram Muhammad Yasir,Wang Huijie
In this study, a plasmonic p–n heterojunction Ag@Ag 2 O–BiVO 4 photocatalyst was successfully prepared by a simple chemical precipitation-reduction process. The obtained samples were tested by various measurements and the photocatalytic behavior in the decomposition of tetracycline (TC) under irradiation with visible light was studied. The photodegradation study exhibits that Ag@Ag 2 O–BiVO 4 has the optimum activity and can efficiently degrade 83.52% of TC in 60 min by irradiation with visible light. Furthermore, the Ag@Ag 2 O–BiVO 4 exhibited more pronounced visible light absorption and the best performances than the BiVO 4 and Ag 2 O–BiVO 4 , which was mainly due to the LSPR of plasmonic Ag. The experimental radical trapping proved that the active species of the photocatalytic process act in the following order: ·O 2 − > h + > · OH. To find intermediates, the possible TC degradation pathways via HPLC–MS were also investigated. This research provides a successful method to develop a plasmonic photocatalyst with p–n heterojunction for wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Gongduan Fan,Banghao Du,Jinjin Zhou,Zhongsen Yan,Yifan You,Jing Luo
The practical application of photocatalytic technology in the natural water body is limited by the low reuse capability and potential secondary pollution risk of powder catalysts. Consequently, it is highly desirable to develop the stable floating photocatalytic composites for efficient alleviating harmful algal blooms. In this study, the self-floating Ag 2 O/g-C 3 N 4 /hydrogel composites with a porous three-dimension (3D) network nanostructure via the cross-linking of chitosan and polyvinyl alcohol have been synthesized. The effects of doping load, initial algal density and dissolved organic matter on Microcystis aeruginosa ( M . aeruginosa ) removal were investigated by Ag 2 O/g-C 3 N 4 /hydrogel under visible light irradiation. Among the synthesized photocatalysts, the 20-Ag 2 O/g-C 3 N 4 /hydrogel showed the highest adsorption, good reusability performance and excellent photocatalytic activity within 4 h for the removal of M . aeruginosa . Algal cell membrane and phycobiliprotein were severely damaged during the photocatalytic process. The inactivation mechanisms are attributed to the water-adsorbing swelling of the hydrogel and the generated reactive oxygen species (mainly ·O 2 − and ·OH) by Ag 2 O/g-C 3 N 4 . Moreover, the antioxidant system of the algae cells was also collapsed under the effects of reactive oxygen species. The superoxide dismutase (SOD) and catalase (CAT) content of algal cells decreased rapidly after photocatalytic reaction by Ag 2 O/g-C 3 N 4 /hydrogel, while the malondialdehyde (MDA) activity was higher than that of the control group. The self-floating Ag 2 O/g-C 3 N 4 /hydrogel photocatalyst would have real practical applications for harmful algae in the fields of natural water body.
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Tingting Li,Shenglian Luo
Ag 2 O/Bi 2 O 3 microspheres were successfully synthesized by a facile co-precipitation hydrothermal method in the presence of surfactant polyvinylpyrrolidone (PVP). X-ray diffraction confirmed that Ag 2 O/Bi 2 O 3 was made up of the cubic Ag 2 O phase and the tetragonal Bi 2 O 3 phase. Scanning electron microscopy and transmission electron microscopy showed that the synthesized Ag 2 O/Bi 2 O 3 microspheres were assembled by radially grown nanosheets with the thickness of about 50 nm. In comparison with N-doped TiO 2 , Bi 2 O 3 and Ag 2 O, the Ag 2 O/Bi 2 O 3 composites showed much higher efficiency for photodegradation of Rhodamine B (RhB) under visible light irradiation ( λ ≥420 nm). Among the Ag 2 O/Bi 2 O 3 composites, the sample with 0.3 mol fraction of Ag 2 O exhibited the highest photocatalytic activity. The excellent photocatalytic activity of Ag 2 O/Bi 2 O 3 may be ascribed to the strong visible light absorption resulting from the quantum dot sensitization of Ag 2 O and the efficient separation of photogenerated electron–hole pairs through Ag 2 O/Bi 2 O 3 heterojunction . The possible photocatalytic mechanism was proposed based on band gap structure analysis and the reaction effects by adding the radical scavengers.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 30
·15710-15714
·
IF 7.443
Ming Wu,Jun-Min Yan,Xue-Wei Zhang,Ming Zhao,Qing Jiang
Ag2O modified g-C3N4 (Ag2O/g-C3N4) was synthesized by a facial hydrothermal reaction. The as-prepared Ag2O/g-C3N4 shows efficient photocatalytic properties for hydrogen evolution from water splitting under visible light irradiation. The rate is about 274 times higher than that of pure g-C3N4, and is even better than that of Pt/g-C3N4. More importantly, Ag2O/g-C3N4 also demonstrates a relatively good recycling stability for photocatalytic hydrogen evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）