APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater 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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yingdong Hao,Yonghui Zhao,Chunlai Zhang,Xinqing Chen,Nannan Sun,Wei Wei
Achieving a high yield of oxygenates and inhibiting overoxidation remain challenging for CH 4 photooxidation. Here, we report a catalyst with enriched Ag-ZnO interfaces by using ZIF-8 as the precursor. The resulting Ag/Z-450 photocatalysts show extraordinary efficiency in the photocatalytic oxidation of CH 4 , a high liquid oxygenate yield of 57.88 mmol·g cat −1 (28.94 mmol·g cat −1 ·h −1 ) and a selectivity of ∼100 % were obtained over 3.0Ag/Z-450, with HCHO as the major product (41.04 mmol·g cat −1 , ∼71 % selectivity). Mechanistic studies revealed that ZnO and Ag species acted as electron donors and acceptors, respectively, which enhanced charge carriers transfer and separation. CH 4 and O 2 can be effectively activated to generate •CH 3 and reactive oxygen species (ROS), their following reaction led to formation of CH 3 OOH, which can be further converted to CH 3 OH and HCHO. This work contributes to the development of a “two-in-one” CH 4 photooxidation catalyst system that simultaneously achieves unparallel productivity and selectivity.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Journal of Applied Spectroscopy
·
2024
·Vol. 91
·期 4
·903-911
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IF 0.8
Zheng Zhiheng,Zhang Fan,Liu Yankun,Wang Zhiwu,Pei Yuan,Wu Zhengang,Li Bo,Wei Yingna,Chen Ying,Wei Hengyong,Li Jingwu
TiN–Ag@Ag composite substrates were prepared via ammonia reduction nitridation followed by electrochemical deposition. Fabricated TiN–Ag@Ag substrates were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and ultraviolet-visible spectrophotometry. The surface-enhanced Raman spectroscopy activity of these substrates was evaluated using ibuprofen as the probe molecule. The size of the Ag particles prepared via electrochemical deposition was approximately 1 μm, and Ag nanoparticles with an average particle size of 100 nm were uniformly distributed on the surface of TiN–Ag films. The Raman signal of ibuprofen was significantly enhanced, and the minimum detection concentration of ibuprofen was 10 –5 M. The mechanism by which the TiN–Ag@Ag composite substrate enhanced the Raman signals was analyzed using ultraviolet photoelectron spectroscopy and density functional theory implemented in the Gaussian software. Overall, charge transfer and the local electromagnetic field effect enhanced the Raman signals of ibuprofen.
研究领域:
材料科学
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分析化学
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纳米技术
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药物分析
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Jiao Li,Tingting Xue,Jiuyang Li,Jiaqi Wang,Xiaochao Zhang
The immobilization of highly-efficient catalyst has always been one key issue in the research and development of industrial catalysts for carbon dioxide reduction. In this work, a series of novel Ag/Bi 12 SiO 20 /BiOBr composite films with varying levels of Ag deposition have been successfully synthesized using in-situ photodeposition method. Photocatalytic CO 2 reduction experiments indicate that 1.5 wt.%-Ag/Bi 12 SiO 20 /BiOBr composite film demonstrates the highest CO generation rate (33.47 μmol∙m −2 ∙h −1 ) and cycle stability, exhibiting the 1.62-fold increase after the incorporation Ag nano-particles (NPs). Characterization tests reveal that the presence of Ag NPs not only brings about the red-shift phenomenon of light absorption to extend and enhance visible-light response, but also acts as photo-generated carrier recombination center between Bi 12 SiO 20 and BiOBr to create unique Z-scheme charge transport pathway. More importantly, the Schottky barrier effect between Ag and semiconductors is conducive to improving the effective separate of photogenerated charges, improving photocatalytic CO 2 reduction. Our findings should offer valuable guidance for the research and development of construction heterostructures and noble metal deposition modification strategy for solar-driven CO 2 reduction photocatalyst system.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Ting Xu,Shuang Wang,Tao Wang,Xin Li,Yanli Chen,Qiong Wu,Lili Yang,Xiaoyan Liu,Maobin Wei,Jian Cao
Coupling Ag NPs and direct Z-scheme heterojunction in Fe 3 O 4 @SiO 2 @ZnO-PDA-Ag photocatalysts (FSZ-PDA-Ag) were constructed via the self-polymerization of dopamine. The effects of the loading amounts of Ag NPs on the structure, morphologies, and properties of the photocatalysts were investigated. Under ultraviolet and visible light irradiation, FSZ-PDA-Ag5 exhibited superior photocatalytic activity for tetracycline degradation. Direct Z-scheme ZnO-PDA heterojunction formed in FSZ-PDA-Ag could promote the transfer efficiency of electrons, and then inhibit the recombination of photo-generated charges. Meanwhile, the appropriate load of Ag NPs acted as another conductive channel to further facilitate the electrons transfer , which could extend the lifetime of the photo-generated charges. Thus, the multiple pathways of electrons transfer resulted in the enhanced photocatalytic activity , the degradation mechanism of FSZ-PDA-Ag5 was explored in detail. Moreover, this photocatalyst possessed superior cycling stability and reusability for the wastewater purification. This study may provide a reference for designing efficient and stable photocatalysts.
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
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 27
·9274-9281
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IF 4.174
He Li,Yu Zou,Jiang Jiang
Ag and CuO in the form of nanoparticles have been widely used in our daily life as antibacterial agents, through releasing Ag ions and generating reactive oxygen species (ROS). In this work, we demonstrate that by synthesizing Ag@CuO nanohybrids with core–shell configurations, their bactericidal activity can be synergistically enhanced compared to the respective constituents. Upon AM 1.5G light illumination for short durations, the measured minimum inhibitory concentrations of the Ag@CuO nanohybrids show a significant decrease against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacterial strains, requiring only 7% and 34% of those when conducted in the dark. The spread plate results demonstrate that with nanohybrid concentrations of 11.0 and 21.9 mg L−1, at least 7 orders of magnitude decrease in Escherichia coli and Staphylococcus aureus colony forming units is achieved, when the Ag@CuO nanohybrids are exposed to light illumination for 10 min. The effect of illumination is found to induce Ag+ release and enhance 1O2 generation, which act concertedly to facilitate the remarkable photo-enhanced bactericidal effect.
研究领域:
材料科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Jia-Feng Xu,Jia-Cheng Wu,Lu-Jiong Ruan,Wei Tian,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Coupling photocatalysis with membrane separation technology becomes one pioneering method to solve the membrane fouling . In this study, Ag@SnS photocatalyst was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate Ag@SnS/PVDF composite membranes via non-solvent induce phase separation (NIPS) method. The results show that with the addition of Ag@SnS, water flux of Ag@SnS/PVDF hybrid membranes increases due to the enhanced membrane hydrophilicity and increased porosity. The optimal hybrid membrane (MAS-2) exhibits the rejection rate of 97.0 % and 95.4 % for BSA and HA accompanied with a water permeance of 578.5 L m −2 h −1 bar −1 . Moreover, MAS-2 membrane reveals excellent self-cleaning ability by photodegradation of HA on membrane surface , and its flux recovery rate (FRR) can achieve 91.7 % after UV irradiation and 95.8 % after 3 h natural sunlight irradiation via photocatalysis regeneration. The heterostructure of Ag@SnS can assist separation of photoinduced electrons and holes by transferring photoinduced electrons to Ag nanoparticles with enhanced photocatalytic activity. After three cycles, the FRR can still reach around 90.0 %, revealing its outstanding cleaning ability. Therefore, the Ag@SnS/PVDF membranes have a foreseeable potential in the field of water treatment due to its high flux performance, self-cleaning ability via photocatalysis process.
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
ChemistrySelect
·
2024
·Vol. 9
·期 27
·e202303733
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IF 1.9
Yao Gu,Dongjian Shi,Liang Wang,Mingqing Chen
Graphical A range of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composite materials, featuring varying Fe 3 O 4 concentrations, were synthesized utilizing the co-precipitation method. The inherent magnetic characteristics of Fe 3 O 4 , combined with the resultant Z-type heterojunction structure, confer exceptional photo-catalytic prowess upon the material. This enables swift degradation of rhodamine B, and furthermore, facilitates its retrieval for subsequent reuse. To increase specific surface area and light utilization of photo-catalysts, a series of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites with different Fe 3 O 4 contents were synthesized via co-precipitation. The structure, composition, and optical properties of these composites were characterized using X-ray diffraction (XRD), nitrogen adsorption and desorption (BET), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and fluorescence spectroscopy (PL). The photo-catalytic activity of the composites was further evaluated using rhodamine B as a model for photo-catalytic degradation. The results revealed that the composites with optimal Fe 3 O 4 loading exhibited the narrowest bandgap width, approximately 2.13 eV, and the highest electron-hole pair separation efficiency. Rhodamine B could be almost completely degraded within a short illumination time in the presence of the Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites. The degradation mechanism of rhodamine B was proposed to involve the improvement of the photo-catalytic activity of the resulting composites by the Fe 3 O 4 and the Z-type heterojunction structure. Additionally, the composites could be recycled and reused multiple times, making them an environmentally friendly and sustainable option.
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
Food Bioscience
·
2024
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IF 4.8
Jiaxin Wen,Yuxin Guo,Xiangyu Li,Bingyang Wang,Huifang Wang,Xianghua Gao,Baolong Niu,Wenfeng Li
Antimicrobial packaging films are an effective means to avoid food infections. PVA has good film-forming and mechanical properties, but its water resistance and antimicrobial properties are insufficient. In this study, a rod-shaped Ag-MOF with photocatalytic properties was synthesized as an antimicrobial agent by a hydrothermal method using citrate esterified PVA as a film-forming substrate. The MICs of Ag-MOF against Escherichia coli and Staphylococcus aureus were 16 μg/mL and 32 μg/mL, respectively, and it had good biocompatibility. Under blue light irradiation, Ag-MOF induced the production of ROS, which increased the inhibition rate by more than 83.78%. The antimicrobial mechanism experiments showed that it caused irreversible damage to the bacterial cell membrane through the synergistic effect of Ag + and ROS. The best mechanical properties of the films were obtained at 3% citric acid content, with the water vapor transmission rate, water solubility and swelling rate reduced by 0.19 g·mm·m −2 ·h −1 ·kPa −1 , 65.33% and 11.26%, respectively. The antimicrobial rate of the composite film could reach more than 98% by adding only 1 MIC of Ag-MOF. In conclusion, photocatalytic antimicrobial agents have great potential for application in food packaging.
研究领域:
食品科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 21
·12311-12320
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IF 4.4
Fang Jia,Yi Chengcheng,Pu Ping,Chen Chen,Yang Yi,Wang Jiaxin,Lin Bin
Ag/CeO 2 catalyst is synthesized by hydrothermal method, which has been studied under the effects of different catalyst content, ash and Ag load through activity and characterization tests. Ag loading increases the catalytic activity of CeO 2 , and the peak combustion temperature of soot decreases by 74 °C. The catalytic effect of Ag/CeO 2 is affected by catalyst content, Ag load and ash content. The optimum mass ratio of soot/catalyst is 1/10, and 10 mass% is the saturation value of Ag loading at CeO 2 . Ash inhibits the promoting effect of Ag/CeO 2 in the oxidation process of soot. This study provides a theoretical basis for the industrial application of Ag/CeO 2 catalyst in gasoline engine and also provides a research idea for the low-temperature oxidation of soot.
研究领域:
催化
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环境科学
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材料科学
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DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 15
·期 7
·1339-1344
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IF 3.842
Wei Wang,Zhenyu Feng,Wei Jiang,Jinhua Zhan
Porous CuO–Ag nanofibers have been synthesized via a combination of the electrospinning technique and the PVP-assisted sol–gel technique in the absence of any templates. The thermal behavior of the as-spun fibers was characterized by TG-DSC while FT-IR was employed to prove the removal of the polymer, which resulted in a porous structure. The structure and morphology of the resultant products were characterized by XRD, TEM and SEM. Porous CuO–Ag nanofibers fabricated on a Si substrate exhibited large Raman enhancement ability, which was also investigated. The SERS signals on the obtained substrate had perfect temporal stability under continuous laser radiation and a good uniform response, enabling quantitative detection of analyte azobenzene. The log–log plot of the SERS intensity to the azobenzene concentration exhibited a good linear relationship.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Lijuan Fu,Junsheng Yu,Jinsong Wang,Fan Xie,Shun Yao,Yongsong Zhang,Jiang Cheng,Lu Li
CuSbS 2 has been considered as a promising photovoltaic absorber material, due to its earth abundant and environmentally friendly constituents. However, the electron affinity and similar radius of cations bring heavy atomic disorders in CuSbS 2 film, limiting its photovoltaic performance. Herein, we report an efficient way to reduce disorders by introducing Ag atom into CuSbS 2 crystal structure. The crystal structure and chemical analysis confirm that Ag occupies the Cu position in the as-prepared films by the spray pyrolysis. The absorption spectra combined with photoluminescence measurement indicate that Ag-substituted CuSbS 2 films have fewer recombination centers. The density functional theory calculation result reveals that Ag-substituted CuSbS 2 has a more stable crystal structure, and the formation energy of the primary point defects obviously increases. Therefore, Ag-substituted CuSbS 2 photovoltaic device shows asignificantly improved power conversion efficiency from 0.73% to 2.48%.
研究领域:
材料科学
·
光伏技术
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理论计算
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）