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Constructing a novel Zn2SnO4/C/AgBr nanocomposite with extended spectral response and improved photocatalytic performance
摘要： High-ef?cient photocatalyst based on Zn2SnO4/C/AgBr multi-component heterostructure was prepared via a two-step hydrothermal synthesis method followed by chemical deposition process. Morphological studies showed that ultra-?ne AgBr nanoparticles with the size of 3e5 nm were in situ grown on the surface of the carbon layers attached to Zn2SnO4 nanocrystals. UVevis characterization demonstrated that the co-modi?cation of carbon and AgBr contributed to the dramatically improved light absorption ability of Zn2SnO4/C/AgBr nanocomposites. In the multi-component heterostructured photocatalyst, carbon functioning as a charge mediator plays a pivotal role in separating photogenerated electron-hole pairs ef?ciently. Zn2SnO4/C/AgBr photocatalysts exhibited a signi?cant enhancement of visible-light photocatalytic performance toward the photodegradation of rhodamine B (RhB), resulting from the synergistic effect of the intensi?ed visible-light absorption capacity and ef?cient photogenerated electron-hole pairs transfer. In addition, a proposed schematic mechanism for the signi?cant enhancement of photocatalytic performance is as well put forward on the basis of the experimental results.
关键词： Photocatalytic degradation,Visible-light,Heterostructure,Zn2SnO4/C/AgBr
更新于2025-09-23 15:23:52
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Dispersion of Ag–AgBr particles in activated carbon as a recyclable photocatalyst for adsorption and degradation of pollutants
摘要： The photocatalyst, with high photocatalytic performance and cycling stability in visible light, as well as superior adsorption capability, was highly desired for degradation of organic pollutants in wastewater. In this contribution, the uniform and well-dispersed morphology with cubic Ag–AgBr particles were homogeneously decorated on the porous activated carbon (AC), by a simple solvothermal-photoreduction method, so as to obtain a hybrid photocatalyst with optimized nanostructure. The materials were systematically characterized and further evaluated for degradation of Rhodamine B (RhB) under visible light irradiation. The results indicated that the composite had a high adsorption capacity and photocatalytic properties for the removal of organic compounds, which is attributable to the formation of heterojunctions between Ag0, AgBr and AC. Furthermore, the possible photodegradation mechanism was postulated based on the photoactive radicals test. This study provides new insights into the design and fabrication of advanced visible light photocatalytic materials as well as the potential application in organic pollution cleanup.
关键词： adsorption,photocatalytic properties,Ag–AgBr-AC,photoactive radicals
更新于2025-09-23 15:22:29
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An efficient and robust exfoliated bentonite/Ag <sub/>3</sub> PO <sub/>4</sub> /AgBr plasmonic photocatalyst for degradation of parabens
摘要： Efficient visible-light-driven heterojunction photocatalysts have attracted broad interest owing to their promising adsorption and degradation performances in the removal of organic pollutants. In this study, a mesoporous exfoliated bentonite (EB)/Ag3PO4/AgBr (30%) photocatalyst was obtained by stripping and exfoliating bentonite as the support for loading Ag3PO4 and AgBr. The particle size ranges of Ag3PO4 and AgBr were about 10–30 nm and 5–10 nm, respectively. The exfoliated bentonite could greatly improve the dispersion and adsorption of Ag3PO4 and AgBr, and significantly enhance the stability of the material during paraben photodegradation. 0.2 g L?1 methylparaben (MPB) was completely decomposed over the EB/Ag3PO4/AgBr (30%) in 40 min under visible light irradiation. In addition, the photocatalytic activity of EB/Ag3PO4/AgBr (30%) remained at about 91% after five recycling runs manifesting that EB/Ag3PO4/AgBr (30%) possessed excellent stability. Radical quenching tests revealed that holes (h+) and hydroxyl radicals (?OH) were the major radicals. They attacked the side chain on the benzene ring of parabens, which were gradually oxidized to the intermediates, such as benzoic acid, 3-hydroxybenzoic acid, 4-hydroxybenzoic acid, azelaic acid, and eventually became CO2 and H2O. The enhancement of photocatalytic activity and photo-stability could be ascribed to the stable structural characteristics, enlarged surface area, high absorption ability, and improved light absorption ability from loading Ag3PO4 onto EB. Meanwhile, the matched energy levels of Ag3PO4 and AgBr made the photoelectron–hole pairs separate and transfer effectively at the interfaces. As a result, the photocatalytic properties of EB/Ag3PO4/AgBr (30%) composites were enhanced.
关键词： heterojunction photocatalysts,exfoliated bentonite,Ag3PO4/AgBr,paraben photodegradation,visible-light-driven
更新于2025-09-23 15:19:57
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A New Ag/AgBr/LaAlO3 Plasmonic Composite: Synthesis, Characterization, and Visible-Light Driven Photocatalytic Activity
摘要： In recent years, fabricating the visible-light induced photocatalysts based on the concept of plasmonic photocatalysis provides an efficient way to reduce environmental pollution. Accordingly, the present investigation has been carried out to develop such materials based on lanthanum aluminate (LaAlO3; LAO) and Ag/AgBr. The Ag/AgBr/LAO composite is prepared by deposition of metallic Ag nanoparticles onto the pre-prepared AgBr/LAO heterostructure by visible-light photo-reduction. The characteristic properties of synthesized catalysts were investigated by using a variety of techniques such as XRD, N2 adsorption–desorption, FESEM/EDX/EDS mapping, TEM-HRTEM, UV–Vis DRS, FT-IR, XPS, and PL measurements. The photocatalytic degradation of methylene blue (MB) was used as a probe reaction to evaluate their photocatalytic activity under visible-light irradiation. Because of the higher surface area with vast mesoporous nature, enhanced visible light absorption, and more efficient charge separation after the deposition of Ag/AgBr, the composite Ag/AgBr/LAO showed enhanced photocatalytic activity compared with pristine LAO. The recycling experiment revealed excellent stability (up to five successive cycles) of Ag/AgBr/LAO composite. Furthermore, a photocatalytic mechanism is proposed for the degradation of MB over Ag/AgBr/LAO composite. The composite Ag/AgBr/LAO can be used as a promising catalyst for environmental remediation.
关键词： charge separation,methylene blue,Ag/AgBr,plasmonic Ag nanoparticles,nanocomposite,LaAlO3
更新于2025-09-23 15:19:57
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Fabrication of novel AgBr/Bi <sub/>24</sub> O <sub/>31</sub> Br <sub/>10</sub> composites with excellent photocatalytic performance
摘要： Novel porous AgBr/Bi24O31Br10 (AB/BOB) heterojunction composites were prepared by a hydrothermal calcination-ion exchange route and their physico-chemical properties were characterized by XRD, XPS, SEM, EDX, UV-vis DRS, BET and electrochemical measurements. The photocatalytic activity of the composites consisting of different AB/BOB mass ratios was evaluated by degradation of methylene blue (MB) under visible light irradiation. Compared with pure AB and BOB, the porous 20% AB/BOB composite exhibits much enhanced photocatalytic activity with good cycling stability. The significant enhancement in photoactivity is contributed to by both a high adsorption capacity and the separation efficiency of photo-generated electron–hole (e–h+) pairs via a Z-scheme mechanism. In addition, radical scavenging experiments confirm that the reactive ?OH radicals play an important role in the photocatalytic reaction. The novel AB/BOB heterojunction composites could have a promising application in treatment of various dyestuff wastewaters on a large scale.
关键词： AgBr/Bi24O31Br10,heterojunction,Z-scheme mechanism,photocatalysis,visible light
更新于2025-09-19 17:15:36
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In Situ Ion Exchange Synthesis of Cauliflower-like AgBr/Ag3PO4/Sulfonated Polystyrene Sphere Heterojunction Photocatalyst With Enhanced Photocatalytic Activity
摘要： The cauliflower-like AgBr/Ag3PO4/sulfonated polystyrene sphere (SPS) heterojunction photocatalyst was prepared using wastewater containing silver ion and SPS as raw materials via in situ ion change method. The AgBr/Ag3PO4/SPS photocatalyst was characterized by field emission scanning electron microscopy, X-ray diffraction and UV–Vis diffuse reflectance spectra (UV–Vis DRS). The results showed that AgBr nanoparticles and Ag3PO4 nanoparticles are highly dispersed on the surface of sulfonated polystyrene. And the heterogeneous junction structures are also formed between AgBr and Ag3PO4, which is benefit for the separation of photogenerated electrons and holes. Hence, the AgBr/Ag3PO4/SPS photocatalyst had an excellent activity for photocatalytic degradation of rhodamine B (RhB) in water under visible light irradiation. The cyclic test results showed that the AgBr/Ag3PO4/SPS photocatalyst also had a good stability.
关键词： Semiconductor,Functional material,Polymeric composite,AgBr/Ag3PO4/SPS
更新于2025-09-19 17:15:36
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Cotton functionalized with nanostructured TiO2-Ag-AgBr layer for solar photocatalytic degradation of dyes and toxic organophosphates
摘要： The functionalization of cotton fabric with photoactive TiO2-Ag-AgBr nanostructured layer has been successfully developed using a low temperature non-aqueous sol-gel route and aqueous suspension of AgBr. Evidence for the growth of TiO2 layer and the immobilization of AgBr nanoparticles have been confirmed by Raman, XRD and XPS. GSDR analysis revealed a strong absorption in the visible region brought by surface Plasmon resonance (SPR) of Ag nanocrystals generated at the surface of AgBr. The XPS evidenced the presence of Ag+, Ag0 and bromine, suggesting that Ag0 formed a shell around the deposited AgBr. The immobilized TiO2-Ag-AgBr heterostructured layer imparts a strong photocatalytic activity under visible light for the degradation of dyes in aqueous solution as well as of dimethyl methylphosphonate (DMMP), a chemical warfare agent simulant. These new catalytically active functionalized fabrics, with self-detoxification properties, have great potential for application in chemical protective clothes and might offer new opportunities for the design of functional materials for toxic chemical protection.
关键词： Ag-AgBr,plasmonics,cotton,warfare,TiO2
更新于2025-09-19 17:15:36
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Construction of 1D Ag-AgBr/AlOOH Plasmonic Photocatalyst for Degradation of Tetracycline Hydrochloride
摘要： In this work, the highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results con?rm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that ?O?2 and ?OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading organic pollutants.
关键词： tetracycline hydrochloride,degradation,Ag-AgBr/AlOOH,plasmonic photocatalyst,methylene blue
更新于2025-09-19 17:13:59
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High photoresponse and fast carrier mobility: Two‐dimensional rGO‐AgBr/Ag composite based on Z‐scheme heterointerface with plasma for hydrogen evolution
摘要： With the improvement of people's living standard, energy shortage is increasingly severe. Photocatalysis technology is one of the most effective means to solve this problem. Generally, poor visible‐light response and fast combination of photo‐induced carriers are the main limiting factors to traditional photocatalysts. Aiming at this problem, in this paper, AgBr was used as the photosensitizer to immobilize on the surface of reduced graphene oxide (rGO) for the complexation of Ag+ ions and carboxyl groups of precursor graphene oxide (GO), then the two‐dimensional rGO‐AgBr/Ag composites (2D rGAA‐α, α = 1, 2 and 3) were synthesized by solvothermal method. The structures, morphologies, chemical bonding states and photoelectrochemical properties of the samples were analyzed to study the samples, and the corresponding visible‐light‐driven (VLD) catalytic performances were studied by hydrogen evolution reaction (HER). Compared with pure rGO, the light absorption of rGAA‐α was almost extended to full spectral range for the Z‐scheme heterointerface (rGO‐AgBr) construction, and the separation of photo‐induced carriers can be promoted effectively. The HER results showed that the average hydrogen evolution rate ( Rp) of rGAA‐α was significantly increased, and the rGAA‐2 catalyst presented the highest Rp (72.71 μmol ‐1). After six recycling experiments, the very faint activity decrease and ‐1g h unobvious structure change suggested the high photostability. Accordingly, the enhanced catalytic activity of rGAA‐α catalysts was attributed to the formation of Z‐scheme heterointerface and generation of Ag plasmas, so this study will provide a simple, effective and promising method for hydrogen energy development.
关键词： AgBr,heterostructure,Ag plasma,hydrogen evolution,reduced graphene oxide
更新于2025-09-12 10:27:22
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Enhanced photocatalytic activity and stability of AgBr/BiOBr/graphene heterojunction for phenol degradation under visible light
摘要： In this work, we have reported synthesis of AgBr/BiOBr photocatalyst supported on graphene (Gr) using facile precipitation method. AgBr/BiOBr/Gr was characterized using various spectral techniques like FESEM, TEM, XRD, FTIR, XPS, Raman and PL analyses. AgBr/BiOBr/Gr had improved visible light absorption. PL studies indicated the reduction in recombination of photogenerated electron hole pair of AGBr/BiOBr/Gr. AFM analysis con?rmed the thickness of AGBr/BiOBr/Gr was less than 8.0 nm. The higher dispersibility of photocatalyst was ascertained by Tyndall effect. AgBr/BiOBr/Gr photocatalyst was effectively used for the photodegradation of phenol from simulated water. The phenol degradation process was remarkably in?uenced by adsorption process. The concurrent adsorption and photocatalytic was effective for degradation of phenol. The phenol was completely mineralized into CO2 and H2O in 6 h. The degradation process followed pseudo ?rst order kinetics. The results con?rmed that integration of AgBr/BiOBr with graphene caused an increase in photocatalytic activity due to reduced recombination of photogenerated electron hole pair and electron sink behavior of graphene for photogenerated electrons of BiOBr. AgBr/BiOBr/Gr photocatalyst displayed signi?cant stability and recyclability for ten catalytic cycles.
关键词： Enhanced photocatalytic activity,Recyclability,Phenol degradation,Graphene,AgBr/BiOBr,Heterojunction formation
更新于2025-09-11 14:15:04