DESALINATION
·
2025
·
IF 9.8
Liying Song,Tao Zhou,Jing Wang,Hongmeng Ding,Liyan Yu,Zhaolin Yang,Na Song,Lina Sui,Lifeng Dong
Biofouling remains a critical challenge in polyamide thin-film composite reverse osmosis (RO) membranes, significantly impairing performance and increasing operational costs. To address this, we developed a thermoresponsive antibacterial strategy by grafting poly(N-isopropylacrylamide)-silver (PNIPAm-Ag) nanocomposites onto RO membrane surfaces via a potassium persulfate (K₂S₂O₈)-assisted grafting method. The resulting thin-film nanocomposite (TFN) membranes leverage the temperature-sensitive phase transition of PNIPAm to regulate Ag + release: at temperatures below the lower critical solution temperature (LCST), PNIPAm swells and retains Ag + ; upon temperature rise during RO operation (e.g., 37 °C), it collapses and triggers controlled Ag + release. This intelligent response enables potent antimicrobial activity, achieving inhibition rates of 99.8 % against E. coli , 98.4 % against S. aureus , and 94.6 % against C. albicans . Furthermore, the modified membranes exhibit enhanced antifouling properties with a flux recovery rate (FRR) of 91.45 %, improved long-term stability, and maintained high salt rejection (>99 %). This work presents a promising approach for developing smart, self-defensive RO membranes with on-demand antibacterial functionality.
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高影响因子
CARBON
·
2018
·
IF 7.082
Xin Liu,Changfeng Chen,Hongwu Ye,Yushuai Jia,Yiyun Wu,Ailing Jin,Yabin Wang,Xiangshu Chen
The growth of Ag nanowire@carbon nanofiber@Ag nanoparticles (denoted as Ag NW@CNF@Ag NPs) is achieved by a one-step, template-free hydrothermal method using Ag 3 PO 4 -AgCl as the catalyst precursor and naturally available glucose as the carbon source. In the hydrothermal process, freshly prepared AgCl together with the active Ag 0 particles produced by the Ag 3 PO 4 –glucose redox reaction cocatalyzes the growth of tubular CNFs and leads to in situ assembly of the coaxial one-dimensional nanostructure of Ag NW@CNF, with ultrasmall Ag NPs well dispersed outside. The structure and composition are characterized using various advanced microscopic and spectroscopic techniques. The fabricated Ag NW@CNF@Ag NPs composite displays superb catalytic activities for the photodegradation of the organic pollutant methylene blue under visible light, which is contributed by the excellent adsorption ability of CNFs as well as the unique electron transport property afforded by the synergistic effect between Ag NW-Ag NP and conductive CNF. Coupled with economical, environmentally friendly synthetic process, sustainability of precursor, and versatility of material, the novel ternary composite developed in this study paves a new way for the fabrication of other carbon material-based hybrids to improve heterogeneous catalysis and solar-driven photocatalytic applications.
研究领域:
材料科学
·
环境科学
·
纳米技术
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Zhiyu Liu,Liang Chen,Congcong Piao,Jianhe Tang,Yu Liu,Yitong Lin,Dawei Fang,Jun Wang
A novel Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is prepared via hydrothermal and calcination methods. In this system, WO 3 :Yb 3+ ,Er 3+ is used as an excellent up-conversion luminescent agent and highly active photocatalyst to broaden the light response range. Ag with SPR effect is regarded as electronic channel and cocatalyst to accelerate electron transfer and increase hydrogen production. The photocatalytic performance of Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is assessed by levofloxacin degradation with synchronous hydrogen production. Some influence factors, sunlight irradiation time, sacrificial agent concentration and catalyst cycle number, are discussed. The emission light spectrum and energy conversion mechanism of WO 3 :Yb 3+ ,Er 3+ are studied. The photocatalyst gives prominent degradation ratio (90.44 %) and hydrogen production amount (489.02 μmol/g) under sunlight irradiation for 180 min. It shows a high stability and reusability in levofloxacin degradation with synchronous hydrogen production within five cycles. The possible mechanism of levofloxacin degradation with synchronous hydrogen production caused by Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is proposed.
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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.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·9123-9134
·
IF 4.21
Zhou Jianhua,Wang Lin,Zha Xianghua,Li Xiang
Abstract Ag/fluorine-containing polyacrylate latex was successfully synthesized via Pickering emulsion polymerization using Ag/poly(2-dimethylaminoethyl methacrylate- co -hexafluorobutyl acrylate) (Ag/P(DMAEMA- co -HFBA)) hybrid micelles as particle emulsifiers. The influences of introducing the Ag nanoparticles (NPs) component and the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelles on emulsion polymerization and finished cotton fabric properties were studied. The results showed that the Ag/fluorine-containing polyacrylate latex had a higher conversion, smaller particle size than the fluorine-containing polyacrylate latex using P(DMAEMA- co -HFBA) micelles as emulsifiers, indicating the positive effect of Ag NPs on emulsion polymerization. And thermogravimetric analysis (TGA) proved that Ag NPs improved the thermal stability of the latex film. Moreover, the surface of the cotton fabric finished by Ag/fluorine-containing polyacrylate latex showed more rough morphology, better hydrophobicity and excellent antibacterial activity owing to the synergistic effect of the cationic fluorine-containing polyacrylate compounds and Ag nanoparticles. Meanwhile, the presence of Ag NPs also improved the tensile strength of the finished cotton fabric, but reduced slightly the whiteness. When the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelle emulsifier was 8 mg/mL, the Ag/fluorine-containing polyacrylate latex particles presented regular raspberry-shaped with an average diameter of 120 nm, and the water/oil contact angles of finished cotton fabric attained 145° and 90°, respectively. In addition, the finished cotton fabric exhibited excellent antibacterial properties against both S. aureus and E. coli as the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelles was 12 mg/mL. The mechanism for the formation of Ag/fluorine-containing polyacrylate latex was proposed. Graphic abstract
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jun Zan,Yang Shuai,Jun Zhang,Jiachi Zhao,Bingxin Sun,Liuyimei Yang
Intrauterine adhesion (IUA) is a common gynecological disease caused by endometrial injury, which might result in abnormal menstruation, miscarriage, and even fetal deaths. Nevertheless, existing treatment strategies such as intrauterine device and uterine cavity balloons only provide a physical barrier, and not circumvent inflammation of endometrial microenvironment and retrograde infection. In this study, a slow-controlled bifunctional nanostructure was developed via encapsulating hyaluronic acid (HA) on surface of silver-metal organic framework (Ag-MOF), and then loaded in poly lactic- co -glycolic acid scaffold to prevent IUA. In therapy, macro-molecule of HA provided anti-inflammatory function by the adjustment of signal transduction pathways of macrophage surface receptors, whereas Ag-MOF inactivated bacteria by destroying bacterial membrane and producing reactive oxygen. Significantly, the coated HA effectively avoided burst release of Ag + , thus achieving long-term antibacterial property and good biocompatibility. Antibacterial results showed antibacterial rate of the scaffold reached 87.8 % against staphylococcus aureus . Anti-inflammatory assays showed that the scaffold inhibited the release of inflammatory cytokines and promoted the release of anti-inflammatory cytokines. Moreover, in vitro cell tests revealed that the scaffold effectively inhibited fibroblast growth, indicating its good ability to prevent IUA. Taken together, the scaffold may be a promising candidate for IUA treatment.
研究领域:
妇科学
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纳米医学
·
生物材料
·
药剂学
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 68
·e202202044
·
IF 5.02
Hanghang Zhou,Ying Luo,Jun Xu,Lidan Deng,Zheng Wang,Hong He
Graphical The well-defined CaTaO 2 N single crystals with uniform particle size were successfully synthesized through a one-pot NaCl-assisted nitridation procedure. The performance of photocatalytic CO 2 reduction to CO by H 2 O under visible light was enhanced due to the high crystallinity of CaTaO 2 N and the modification with core-shell structured Ni−Ag bicomponent cocatalyst. Cubic-like CaTaO 2 N photocatalysts with high crystallinity and uniform particle size were successfully prepared by the flux-assisted nitridation method. The growth of CaTaO 2 N single crystals under different synthesis conditions was systematically investigated to understand the effects of the crystallinity and optical property on photocatalytic performance of CO 2 reduction. Moreover, the modification of CaTaO 2 N single crystals with core-shell Ni−Ag bicomponent cocatalyst by two-step decoration process gave a 2.4 times higher amount of CO evolution than the deposition of sole Ag cocatalyst, because of the synergistic effects of bicomponent cocatalyst on the interfacial electron transfer and surface catalytic process. This study provides a valuable way to construct high-crystalline photocatalysts with effective bicomponent cocatalyst for visible-light-driven CO 2 reduction with H 2 O.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Min Wang,Dehua Xin,Wei Zhang,Dan Luo,Guoqiang Tan
The optimization of the photogenerated carriers’ relaxation dynamics process is critical for the improvement of photocatalytic performance. Herein, a ternary heterojunction with multilevel charge transfer channels was constructed by coupling plasma Ag, nitrogen vacancies carbon nitride (NVs-CN) and Bi 2 O 2-δ CO 3 . Ag/NVs-CN/Bi 2 O 2-δ CO 3 heterojunction showed the S-scheme mechanism, which not only promoted the interfacial charge transfer, but also enhanced the driving force for redox reactions. The defect states induced by nitrogen vacancies and oxygen vacancies provided an additional energy level platforms for hot electrons relaxation of plasma Ag, resulting in the improved separation efficiency and utilization rate of the high-energy hot carriers. Hence, the prepared Ag/NVs-CN/Bi 2-δ O 2 CO 3 heterojunction exhibited the markedly boosted full-spectrum driven catalytic activity for antibiotics degradation. 80.5% and 83.8% of tetracycline and ciprofloxacin could be mineralized into H 2 O and CO 2 by the optimal heterojunction under visible light irradiation, and the corresponding mineralization efficiencies could reach 81.7% and 81.5% under NIR light irradiation. The proposed multichannel charge transfer mechanism provided a new insight into the design and preparation of high-active full-spectrum responsive heterojunction photocatalysts.
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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.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xinke Wang,Xia Gao,Xiaodong Lin,Shuo Zheng,Yong Yan,Shuo Wang,Yaqing Liu
Silver ion pollution is a great threat to global environment and public healthcare today. Thus, quick, portable and sensitive assays for Ag + tracing are highly needed. Herein, a reliable fluorescent and colorimetric dual-channel assay has been constructed for Ag + detection by utilizing a terbium-based fluorescent nanomaterial (named as Tb-DPA) and a Pt/Pd nanoflower (Pt/Pd NF)-triggered reaction between N-ethyl-N-(3-sulfopropyl)-3-methylaniline sodium salt (TOPS) and 4-amino-antipyrine (4-AAP). Initially, in the sensing system containing 4-AAP, TOPS, Tb-DPA and Pt/Pd NF, TOPS and 4-AAP is catalyzed by Pt/Pd NF to produce a purple compound (called as PC1), which endows a broad UV absorption that can fully cover the emission band of Tb-DPA. Thus, the system exhibits a high UV absorption (originating from PC1) and a low fluorescence intensity (originating from Tb-DPA) which has been quenched by PC1 through a filtering effect. However, when the system meets Ag + , the oxidase-like activity of Pt/Pd NF will be inhibited, leading less amount of PC1. As a result, the system exhibits a decreased UV absorption and a recovered fluorescence intensity, both of which can be used for Ag + detection, reporting low detection limits of 3.63 nM and 1.63 nM, respectively. Specially, results from the dual-channel assay can mutually validate each other, improving the detection reliability. Moreover, this dual-mode assay shows good capability toward Ag + detection in real samples, illustrating the potential for practical applications.
研究领域:
环境科学
·
分析化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Hao Zhou,Yunfang Liu,Weidong Chi,Changyuan Yu,Yingjie Yu
Immobilization of silver nanoparticles (Ag NPs) on poly-dopamine (PDA) functionalized graphene oxide sheets (GOSs) were carried out by an easy in situ reduction method. The PDA layer was coated on the surface of the GOSs via the self-polymerization of dopamine under atmosphere condition. The PDA layer not only works as the chemisorption and reduction sites for silver ions to form Ag NPs but also stabilizes them. High-resolution transmission electron microscopy observation shows that the average size of the Ag NPs anchored on the PDA/GOS composite is about 2.8 nm. The inhibition zone diameter of the Ag@PDA/GOS nanocomposite is about 23.7 mm, whereas said diameter of the Ag NPs is only 18.5 mm. The minimum bactericidal concentration of the Ag@PDA/GOS nanocomposite is about 25 μg/ml that is only half of said concentration of the Ag NPs. The Ag@PDA/GOS nanocomposite exhibits an excellent antibacterial property.
研究领域:
材料科学
·
微生物学
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DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 8
·085403
·
IF 1.929
Yanqin Xu,Jie Liu,Shumin Guan,Aotong Dong,Yuan Cao,Changguo Chen
pH-sensitive Ag/AgO/carboxymethyl chitosan (CMCS) bacteriostatic hydrogels and Ag/AgO/CMCS/Aspirin (ASP) carrier hydrogels were prepared by Ag/AgO in situ precipitation method, and the effects of swelling, degradation, drug release and antibacterial properties of hydrogels were studied. The network of Ag/AgO/CMCS/ASP drug-loaded gels produced was mainly cross-linking by hydrogen bonding and intermolecular forces, and the cross-linking silver was mainly present in the elemental Ag and Ag2+ states. Under the condition of buffer solution pH = 7.4, the cumulative release amount of Ag/AgO/CMCS/ASP drug-loaded gel was 75.20% within 12 h, and the inhibition rate of Gram-negative Escherichia coli (E. coli) reached the maximum of 92.32%, which had broad application prospects in the medical field.
研究领域:
材料科学
·
药学
·
生物医学工程
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高影响因子
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