Frontiers of Chemical Science and Engineering
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2023
·Vol. 17
·期 7
·906-917
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IF 4.5
Zou Min,Tan Chao,Yuan Zhengqiu,Wu Ming,Jian Jian,Zhang Lei,Zhang Yan,Ma Zhou,Zhou Hu
The industrial application of nano-photocatalysts in wastewater treatment has been severely restricted for a long time due to their difficult separation, poor reusability, and low efficiency. In this work, a facile strategy was proposed to enhance the photocatalytic activity and recovery performance of Ag@AgCl nanocatalysts. Biological veins (Bio-veins) with a unique 3D porous construction were used as carriers for the in-situ growth of Ag@AgCl nanoparticles. Scanning electron microscopy results showed that the Ag@AgCl nanoparticles were uniformly loaded on the surface and interior of the Bio-veins, and the size of the Ag@AgCl nanoparticles immobilized on the Bio-veins (50–300 nm) was significantly smaller than Ag@AgCl obtained by the co-precipitation method (1–3 µm). The Bio-veins played a vital role in the photocatalysis reaction system. The degradation efficiency of the Ag@AgCl/Bio-veins(CI4) was up to 3.50 times as high as pure Ag@AgCl. Furthermore, the composites also exhibited excellent recyclability and stability under both visible and solar light. This work provided a suitable strategy for nanophotocatalysts for practical application and may also offer new possibilities for the high-value utilization of biomass materials.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jielin Huang,Shuaifei Liu,Wen Long,Qi Wang,Xin Yu,Shijie Li
Fabricating rapid and high-efficient charge-transfer pathways is contributing to improving charge separation and receiving extensive concerns in preparation of semiconductors composites photocatalysts. In this work, ternary Ag/AgCl/Ta 2 O 5−x mesocrystals were fabricated for visible-light photodegradation of emerging pollutants by introducing Ag/AgCl nanoparticles into defects engineered Ta 2 O 5−x mesocrystals. The prepared composites showed efficient visible-light absorption and efficient visible-light photodegradation of emerging pollutants, mainly attributed to the fabricating of high-efficient Z-scheme charge-transfer pathways between Ag/AgCl and Ta 2 O 5−x mesocrystals. Note that, the experimental results also demonstrated the significant roles of defects engineered Ta 2 O 5−x mesocrystals in fabricating high-efficient Z-scheme charge-transfer pathways. Besides, the prepared Ag/AgCl and Ta 2 O 5−x composites could be employed for efficient visible-light photodegradation of many other organic contaminants. Current work indicates a promising and high-performance visible-light composite photocatalyst for dealing with emerging contaminants.
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
CELLULOSE
·
2021
·Vol. 28
·期 6
·3515-3529
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IF 5.044
Zhang Mingzhu,Li Meng,Yu Ningya,Su Shengpei,Zhang Xiaomin
A series of tannic acid (TA)-modified cellulose hydrogels embedded size-controlled AgCl nanoparticles (AgCl@TA x -cellulose hydrogels) were fabricated successfully via a one-step method. The size of AgCl nanoparticles in the TA-cellulose hydrogels could be adjusted expediently by varying the TA content. With the increase of TA content, the size of AgCl nanoparticles initially decreased and reached the minimum size of 5.5 nm at 5% TA content and then increased dramatically. The hydrogels with the smallest AgCl nanoparticles exhibited excellent catalytic activity in NaBH 4 -mediated reduction of 4-nitrophenol (4-NP); the reaction rate constant was as high as 1.383 min −1 . It should be noted that NaBH 4 played a double role in the reduction of 4-NP presented here, i.e., in-situ reduction of AgCl to Ag nanoparticles and successive reduction of 4-NP over the resultant Ag@TA x -cellulose hydrogels. In such a way, the strategy of “catalysis along with reduction” provided a novel path for catalytic systems involving noble metal catalysts. Also, the above AgCl@TA x -cellulose hydrogels exhibited good catalytic activity for NaBH 4 -mediated reduction of various organic dyes following the procedure of “catalysis along with reduction”.
研究领域:
材料科学
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纳米技术
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催化
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Haijia Zhao,Jiakang Qu,Fengyin Zhou,Zhuqing Zhao,Xiang Chen,Hongwei Xie,Qiushi Song,Dihua Wang,Huayi Yin
High-temperature molten salts are excellent solvents for materials synthesis, because they not only provide a water- and oxygen-free environment but also accelerate the reaction rate by enhancing the mass/electron transport in a liquid medium. Herein, a self-driven salt-thermal reduction approach is reported for preparing low-valence oxides and their compounds without using any reducing agent or toxic chemical. The molten-salt medium drives the reduction of oxides to suboxides and oxygen (e.g., from CuO to Cu2O) and acts as a capping agent to prevent the growth of oxides. At the same time, the AgCl–Cu2O hybrid is prepared from microsized CuO and AgCl. The prepared AgCl–Cu2O hybrids show superior visible-light photocatalytic activity toward the photodegradation of methyl orange in 10 min with a degradation rate of up to 98.4%. Besides the AgCl–Cu2O hybrid, a library of metal oxides can be prepared using eco-friendly feedstocks and chemicals.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Jianxin Liu,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
For detecting the active roles of ZIF-8 in composite photocatalyst , a novel Ag/AgCl/ZIF-8(50%) composite photocatalyst was designately prepared by anchoring Ag/AgCl nanoparticles on the surface of ZIF-8 with 50% content. The adsorption and photocatalytic performance of Ag/AgCl/ZIF-8(50%) were conducted by removal of Rhodamine B (RhB) from aqueous solution under dark and visible light irradiation (λ > 420 nm). The experimental results showed that the as-synthesized Ag/AgCl/ZIF-8(50%) exhibited higher photocatalytic activity than Ag/AgCl. The XRD , TEM , FTIR, DRS, VB XPS, ESR, N 2 adsorption isotherms and active species trapping experiments were used to characterize the performance of the composite photocatalyst. We found that the ZIF-8 in composite photocatalyst not only has the adsorption ability for RhB by its large specific area, but also has the ability for the formation of O 2 · − by an appropriate position of conduction band (CB). A reasonable reaction mechanism with a new perspective on the composite photocatalyst of Ag/AgCl/ZIF-8(50%) was proposed. This insight on the active roles of ZIF-8 in Ag/AgCl/ZIF-8(50%) may open a window for the use of MOF material in photocatalytic field.
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 Applied Materials & Interfaces
·
2020
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IF 8.758
Chun Zhang,Yinan Gu,Guixiang Teng,Liping Wang,Xiaodong Jin,Zengwei Qiang,Weigang Ma
Development of highly efficient photocatalysts is a primary goal in the photocatalysis domain among which reusable composites with a synergistic photocatalytic effect have attracted extensive interest. The ability of catalysts to capture light determines their photocatalytic effect, and porous or hollow photocatalysts are more conducive to the entry and reflection of light. The goal of this research is to develop a type of visible-light-driven, double-shell photocatalyst with high antibacterial activity and excellent cycling stability. Photocatalysts were fabricated using hollow graphitized ZnFe2O4 nanospheres (G-ZnFe2O4) as the carrier. After G-ZnFe2O4 was functionalized with a polydopamine (PDA) template layer, Ag nanoparticles (NPs) and cubic AgCl NPs were in situ generated on the surface of the PDA/G-ZnFe2O4 nanospheres successively. Then, the PDA template was removed using KOH solution, and double-shell Ag/AgCl/G-ZnFe2O4 nanocubes (referred to as DAGZNs) with excellent photocatalytic antibacterial activity were constructed. The DAGZNs showed excellent antibacterial properties against Staphylococcus aureus and Escherichia coli. The efficient synergistic photocatalytic antibacterial activity coupled with magnetic separability and recyclability of DAGZNs make them potential for practical application in water purification and environmental protection. The method of designing and synthesizing double-shell structures to enhance photocatalysis may also be extended to synthesis of other photocatalytic and optical materials.
研究领域:
材料科学
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环境科学
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生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 1
·286-301
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IF 2.993
Fang Hongbiao,Cao Xin,Yu Jiajie,Lv Xiang,Yang Nan,Wang Tianhe,Jiang Wei
Tungsten oxide (WO 3 ) is a well-known photocatalyst, but its application is restricted due to its low conduction band and reduction power. In addition, WO 3 catalyst in powder forms has little application prospect because of difficulties in separation and regeneration. In this work, we prepared WO 3 /Ag/AgCl films on conventional glass that not only have much enhanced photocatalytic capability but also can be readily regenerated. The WO 3 film was prepared on glass substrate by calcination of spin-coated W precursor. Ag/AgCl particles were then deposited on WO 3 film by an impregnating–precipitation–photoreduction method. The photocatalytic efficiency of WO 3 /Ag/AgCl was evaluated by using methyl orange (MO) and Rhodamine B (RhB) as target pollutants. The highest photocatalytic performance was achieved with the 3-WO 3 /Ag/AgCl film, being 18 and 13 times higher than that of pure WO 3 film for degradation of MO and RhB, respectively. The degradation rate for both MO and RhB by 3-WO 3 /Ag/AgCl film catalyst decreased by less than 5% after five cycled tests. The photodegradation mechanism was discussed based on the electrochemical impedance spectroscopy Nyquist tests, photoelectrochemical analysis and reactive oxygen species scavenging experiments. A possible all-solid-state Z-scheme mechanism is proposed based on the photoelectron chemical tests and radical trapping experiments. This study provides a feasible technique to prepare a photocatalytic film with practicability and reproducibility.
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 LETTERS
·
2015
·
IF 2.489
Meichao Gao,Dafeng Zhang,Hong Li,Xipeng Pu,Xin Shao,Wenzhi Li
AgCl/BiOCl heterostructures were synthesized by a simple one-pot combustion method. The as-synthesized photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. Photodegradation experiments show that the AgCl/BiOCl heterostructures exhibit better photocatalytic properties than pure BiOCl sample to degrade rhodamine B. The 15% AgCl/BiOCl shows the best photocatalytic performance under the UV light irradiation. The formation of heterostructure improves the separation of photogenerated electrons and holes derived from the coupling effect of BiOCl and AgCl heterojunction.
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
OPTICAL MATERIALS
·
2023
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IF 3.9
Mian He,Jun Chen,Yang Yang,Xinru Hu,Ziru Jiang,Yuan Yan,Jingyi Sun,Lianshe Fu,Jiamin Wei,Tinghai Yang
Unstable contact interface, inferior charge transmission efficiency and low redox capability significantly inhibit the photocatalytic property of heterojunctions . Herein, a stable AgCl/NH 2 -MIL-68In Z-scheme heterojunction that couples with plasmonic Ag nanoparticles (NPs) to promote efficient long-range charge separation is rationally designed. This heterostructure is successfully fabricated by the in-situ growth of AgCl and Ag NPs on the surface and framework of NH 2 -MIL-68In via a facile ion exchange precipitation approach. Benefiting from the surface plasmon resonance (SPR) effect of Ag NPs and the interfacial heterojunction, the visible light response is enhanced and the recombination rate of photogenerated charges is weakened. Impressively, the artificial Z-scheme heterojunction exhibits superior photocatalytic activity for levofloxacin degradation. Furthermore, the adjustment of the AgCl and Ag NPs loading ratio of NH 2 -MIL-68In further improves the photocatalytic degradation activity of levofloxacin (0.0222 min −1 ), which is much higher than that of pure NH 2 -MIL-68In ( k = 0.00121 min −1 ) and AgCl ( k = 0.00093 min −1 ). This work not only develops an effective photocatalyst for the degradation of organic pollutants, but also provides a promising sight for feasible designing the more stable Z-scheme heterojunction with efficient charge separation efficiency.
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
OPTICS EXPRESS
·
2023
·Vol. 31
·期 16
·26474-26495
·
IF 3.8
Linlin Xu,Ming Chen,Qingqiang Cui,Chang Wang,Mnegya Zhang,Linqi Zheng,Shuang Li,Hua Zhang,Guangda Liang
Exploring multifunctional surface-enhanced Raman scattering (SERS) substrates with high sensitivity, broadband response property and reliable practicability should be required for ultrasensitive molecular detection in complex environments, which is heavily dependent on the photo-induced charge transfer (PICT) efficiency realized on the desirable nano-architectures. Herein, we introduce ultra-clean ternary Au/Ag/AgCl nanoclusters (NCs) with broadband resonance crossing the visible light to near-infrared region created by one step laser irradiation of mixed metal ion solution. Interestingly, the surface defects and interaction among these unique cluster-like ternary nanostructures would be further enhanced by thermal annealing treatment at 300°C, providing higher broadband SERS activities than the reference ternary nanoparticles under 457, 532, 633, 785, and 1064 nm wavelengths excitation. More importantly, the further promoted SERS activities of the resultant Au/Ag/AgCl NCs with achievable ∼5-fold enhancement than the initial one can be conventionally realized by simplistically declining the temperature from normal 20°C to cryogenic condition at about -196°C, due to the lower temperature-suppressed non-radiative recombination of lattice thermal phonons and photogenerated electrons. The cryogenic temperature-boosted SERS of the resultant Au/Ag/AgCl NCs enables the limit of detection (LOD) of folic acid (FA) biomolecules to be achieved as low as 10−12 M, which is obviously better than that of 10−9 M at room temperature condition. Overall, the smart Au/Ag/AgCl NCs-based broadband SERS sensor provides a new avenue for ultrasensitive biomolecular monitoring at cryogenic condition.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2012
·
IF 3.85
Li-guang Wu,Ting Wang,Zeng Jiang
AgCl nanoparticles were synthesized in water—in—oil microemulsions using polymerizable 2-acrylamido-2-methyl propane sulfonic acid (AMPS) as the surfactant and a glycidyl methacrylate (GMA)/methyl methacrylate (MMA) mixture as the oil phase. AgCl/poly(GMA-co-MMA-co-AMPS) copolymer hybrid membranes were prepared by in situ microemulsion polymerization. The morphology of the AgCl particles and hybrid membranes was characterized by UV-visible spectrophotometry, transmission electron microscopy , and scanning electron microscopy. A size decrease was observed in the AgCl nanoparticles with increased surfactant and salt concentrations. The AgCl nanoparticles maintained an even dispersion in the hybrid membranes. The separation performance of the hybrid membranes was evaluated by pervaporation experiments of benzene/cyclohexane mixtures. The high solubility of the polymerizable surfactant in the MMA-GMA mixture led to better hybrid membrane performance compared with the hybrid membranes prepared by macromolecular surfactant. The swelling–sorption behavior of benzene and cyclohexane indicated that the equilibrium swelling–sorption amounts in all hybrid membranes were larger than in membranes without the nanoparticles. When the surfactant and salt concentrations were both 0.3 mol L −1 , the equilibrium swelling–sorption amounts in the hybrid membranes reached a maximum.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-10
·
IF 2.833
Qin Yanyan,Cui Yanping,Tian Zhen,Wu Yangling,Li Yilian
Ag@AgCl core–shell nanowires were synthesized by oxidation of Ag nanowires with moderate FeCl 3 , which exhibited excellent photocatalytic activity for As(III) oxidation under visible light. It was proved that the photocatalytic oxidation efficiency was significantly dependent on the mole ratio of Ag:AgCl. The oxidation rate of As(III) over Ag@AgCl core–shell nanowires first increased with the decrease of Ag 0 percentage, up until the optimized synthesis mole ratio of Ag nanowires:FeCl 3 was 2.32:2.20, with 0.023 mg L −1 min −1 As(III) oxidation rate; subsequently, the oxidation rate dropped with the further decrease of Ag 0 percentage. Effects of the pH, ionic strength, and concentration of humic acid on Ag@AgCl photocatalytic ability were also studied. Trapping experiments using radical scavengers confirmed that h + and ·O 2
− acted as the main active species during the visible-light-driven photocatalytic process for As(III) oxidation. The recycling experiments validated that Ag@AgCl core–shell nanowires were a kind of efficient and stable photocatalyst for As(III) oxidation under visible-light irradiation.
研究领域:
环境科学
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材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
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