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Degradation of methylparaben using BiOI-hydrogel composites activated peroxymonosulfate under visible light irradiation
摘要： A novel hydrogel photocatalyst (p(HEA-APTM)-BiOI) was synthesized by irradiation polymerization and chemical precipitation method, while employed as peroxymonosulfate (PMS) activator to enhance methylparaben (MP) degradation. The structure, morphology and physicochemical properties of the prepared p(HEA-APTM)-BiOI were characterized by XRD, XPS, SEM, TEM, FTIR and BET. The experimental results revealed that the MP catalytic degradation by p(HEA-APTM)-BiOI activated PMS can achieve the best performance under the visible light irradiation. In addition, the parameters including the molar radio of [PMS]/[MP], initial pH, Cl- and HCO3- were also investigated in detail. It was worth noting that p(HEA-APTM)-BiOI also effectively eliminated MP in the absence of visible light. Based on the quenching experiment, 1O2, h+ and ?O2- were determined as the dominant active species contributing to the catalytic oxidation process in the p(HEA-APTM)-BiOI/PMS/Vis system, and the possible degradation mechanism was also elaborated. Eventually, the possible pathways of MP degradation were deduced from several intermediates identified by HPLC-MS.
关键词： Methylparaben,peroxymonosulfate,degradation mechanism,visible light,BiOI-hydrogel
更新于2025-09-23 15:21:21
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Photocatalytic removal of diclofenac by Ti doped BiOI microspheres under visible light irradiation: Kinetics, mechanism, and pathways
摘要： BiOI microspheres doped with different amounts of Ti were fabricated and used to remove diclofenac (DCF) from water under visible light irradiation. The fabricated photocatalysts were well characterized. Ti doped BiOI microspheres were found to exhibit higher photocatalytic activity towards DCF under visible light compared with BiOI. Ti doping broadened the band gap of BiOI, which leads to a more negative conduction band edge and a higher reducing activity of photo-generated electrons, thus facilitates ·O2? production during photocatalysis. Among all the fabricated Ti doped BiOI microspheres, TB450 exhibited the highest DCF photocatalytic removal efficiency. Specifically, 99.2% of DCF (C0 = 10 mg L?1) was removed by TB450 (250 mg L?1) at pH 5 within 90 min under visible light irradiation. Scavenger experiments indicated that active species including h+, ·O2? and H2O2 played important roles in the photocatalytic process. The degradation pathway of DCF was elucidated by theoretical density functional theory (DFT) and by-products identification through liquid chromatograph mass spectrometer (LC-MS) analysis. DCF degradation pathway mainly included hydroxylation and the cleavage of C\N bond. DFT calculation can well interpret the degradation mechanism and the sites of DCF molecule with high radical-attack Fukui index (f0) exhibit high reactivity. Acidic condition was found to facilitate the DCF photocatalytic removal. Due to strong photo-stability, Ti doped BiOI microspheres contained good visible-light-driven (VLD) photocatalytic removal efficiency for DCF in the fourth consecutive reused cycle. Ti doped BiOI microspheres can be employed as a cost-effective and high-efficient material to efficiently degrade emerging contaminants (e.g., pharmaceutical) from wastewaters under visible light conditions.
关键词： Ti doped BiOI microspheres,Photocatalysis,Diclofenac,Reuse,Degradation pathway,DFT calculation
更新于2025-09-23 15:21:21
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In situ synthesis of a cadmium sulfide/reduced graphene oxide/bismuth Z-scheme oxyiodide system for enhanced photocatalytic performance in chlorinated paraben degradation
摘要： An efficient reduced graphene oxide (rGO)-based cadmium sulfide/reduced graphene oxide/bismuth oxyiodide (CdS/rGO/BiOI) Z-scheme system was fabricated by an in-situ growth method. Solid interactions between the rGO and nanoparticles promoted the transmission of photoinduced carriers, which separated and accumulated electrons from CdS and holes from BiOI. Moreover, the Z-scheme system enabled CdS electrons to maintain a high reduction capability and BiOI holes to maintain a high oxidation capability. Therefore, the CdS/rGO/BiOI composite exhibited better photocatalytic activity in the degradation of methyl 3,5-dichloro-4-hydroxybenzoate (MDHB) than that of pure CdS and BiOI under visible light irradiation. In particularly, the identification of active species and transformation products revealed that the accumulated photoinduced electrons promoted the reductive dechlorination of MDHB. The dechlorinated byproducts were then oxidatively split and degraded into harmless small-molecule carboxylic acids or inorganic substances by photoinduced holes. This work provided a favorable in situ growth method to design and synthesize Z-scheme photocatalysts for simultaneous chlorinated paraben dechlorination and degradation under visible light irradiation.
关键词： Dechlorination,Visible light photocatalysis,CdS/rGO/BiOI composite,Z-scheme,Chlorinated paraben
更新于2025-09-23 15:21:01
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Multi-Walled Carbon Nanotubes/BiPO <sub/>4</sub> /BiOI Heterostructure Composite Photoelectrochemical Sensor in Detection of Salicylic Acid
摘要： In this work, BiOI, BiPO4, BiPO4/BiOI (M) and MWCNT/BiPO4/BiOI(MWCNT/M) heterostructure were synthesized through hydrothermal methods and served the function of fabricating photoelectrochemical (PEC) sensor for detection of Salicylic acid (SA). MWCNT covered with BiPO4/BiOI were observed with the aid of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Under visible light excitation, the low detection limit of 0.55 μM and working range of 1–320 μM and 480–3840 μM were obtained at the MWCNT/M/ITO. Moreover, it has excellent reproducibility and long-term stability. Meanwhile, results suggest that MWCNT/M developed herein offers a promising platform for the ultrasensitive detection of SA.
关键词： Multi-Walled Carbon Nanotubes,BiPO4/BiOI Heterostructure,Photoelectrochemical Sensor,Salicylic Acid
更新于2025-09-23 15:19:57
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Synthesis and photocatalytic properties of electrodeposited bismuth oxyiodide on rutile/anatase TiO<sub>2</sub> heterostructure
摘要： Bismuth oxyiodide (BiOI) modified rutile/anatase TiO2 heterostructure was fabricated by a three-step process. Anatase TiO2 sheet was first formed on fluorine-doped tin oxide (FTO) glass substrate. Rutile TiO2 nanorods were then grown on anatase TiO2 sheet via a hydrothermal process. BiOI was finally coated on the surface of hierarchical TiO2 film using an electrochemical deposition method. Photocatalytic tests on degradation of methylene blue (MB) in water indicated that BiOI modified hierarchical TiO2 film possessed an excellent photocatalytic activity superior to those of the monophase anatase and rutile TiO2 films, commercial P25 film and hierarchical TiO2 film. The enhanced photocatalytic performance was probably attributed to the synergetic effects of strong visible light absorption and formation of heterojunctions by the interfaces in the BiOI / rutile TiO2 / anatase TiO2 / FTO structure, which promoted efficient separation of photoinduced electron-hole pairs. In addition, the main active species during the degradation were confirmed to be hydroxyl radicals and superoxide radicals.
关键词： hierarchical rutile/anatase TiO2,nanostructure,film,electrodeposition,charge carrier separation,visible absorption,BiOI
更新于2025-09-19 17:15:36
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Functionalization of cotton fabric with bismuth oxyiodide nanosheets: applications for photodegrading organic pollutants, UV shielding and self-cleaning
摘要： A multifunctional cotton fabric was prepared by immobilizing bismuth oxyiodide (BiOI) nanosheets on the surface of cotton treated to briefly dissolve surface molecules with upon the low-temperature addition of NaOH and urea (cotton micro-dissolution). Immobilization was accomplished by successive adsorption and reaction (SILAR) at the temperature (* 25 °C). The morphology, structural characteristics, photodegradation ability for organic pollutants, UV shielding, and self-cleaning of the treated fabric were studied. The growth rate and uniformity of the BiOI nanosheets were compared between the treated fabrics and the untreated fabrics. The absorption wavelength of the cotton fabric with BiOI nanosheets was extended to the visible light (* 630 nm) region. Under visible light irradiation, cotton fabric containing BiOI nanosheets (BiOI > 8.4 wt%) showed remarkable photocatalytic ability for degrading rhodamine B (RhB) with a degradation rate of 99% (C0 = 20 mg/L) and 95% after the first and sixth cycle, respectively. The ultraviolet protection factor (UPF) of cotton fabric with BiOI nanosheets was > 50, and its transmittance of ultraviolet A (T(UVA)) was < 5%. The cotton fabric with BiOI nanosheets also exhibited superhydrophobic and self-cleaning properties. Thus, the cotton fabric with BiOI nanosheets has great potential for application as a multifunctional protective material.
关键词： BiOI nanosheets,Visible-light photocatalytic activity,Superhydrophobicity,Ultraviolet protection factor
更新于2025-09-19 17:15:36
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Construction of precious metal-loaded BiOI semiconductor materials with improved photocatalytic activity for microcystin-LR degradation
摘要： The composite photocatalyst of precious metal loaded on BiOI (M/BiOI, M = Pt, Au, Ag) was prepared by photochemical deposition and used for the photocatalytic degradation of microcystins (MC-LR). The material was characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet visible (UV-vis) diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), and photoluminescence spectra (PL). The effect of photodegradation of MC-LR and the possible mechanism were investigated. It turned out that, among precious metals of Pt, Au, and Ag, Ag had the most significant improvement for photocatalytic activity of BiOI and Au was the least. The Ag/BiOI catalyst was illuminated 2 h under the simulated visible-light condition with the optimal load ratio of Ag catalyst (1.0 wt%) and the 2-h illumination under simulated visible-light condition, the degradation rate of MC-LR was 61.26% ± 0.12%. In addition, through the experiment of trapping agent and the analysis of electron spin resonance (ESR), we could conclude that the main active species is O2? in the process of the degradation of MC-LR by three precious metal-loaded BiOI semiconductor materials.
关键词： Microcystin-LR,Photocatalysis,Precious metals,BiOI
更新于2025-09-19 17:15:36
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Enhanced photocatalytic degradation and antibacterial performance by GO/CN/BiOI composites under LED light
摘要： GO/CN/BiOI composites were obtained by in-situ generation route and investigated in photocatalytic degradation and antibacterial. Detailed analysis of the photocatalyst was presented by XRD, TEM, SEM, XPS, FT-IR, Raman, DRS, photocurrent, EIS and LSCM. The synthesized GO/CN/BiOI composites showed good photocatalytic degradation and excellent antibacterial performance under LED light. The optimal composite could degrade 93% methyl orange (MO) in 60 min and 74% tetracycline (TC) in 100 min. In terms of antibacterial, GO/CN/BiOI composites could completely inactivated E. coli and S. aureus within 30 min. The mechanism of photocatalytic degradation and antibacterial activity was studied by trapping experiments, and h+ played an important role in the system. The improved photo-performance was attributed to the e?cient separation of electrons (e?) and holes (h+) in the composite. This work showed the GO/CN/BiOI composite is a potential photocatalyst in pollution removing and water disinfection.
关键词： Antibacterial,Photocatalytic degradation,GO/CN/BiOI,LED light
更新于2025-09-16 10:30:52
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AgI-BiOI-graphene composite photocatalysts with enhanced interfacial charge transfer and photocatalytic H2 production activity
摘要： BiOI-based photocatalysts were proved to exhibit photocatalytic H2 production activity. AgI-BiOI-graphene showed better H2 production activity than BiOI and BiOI-graphene. The surface chemistry, electronic property, phase structure, morphology, optical property and photocatalytic performance of these photocatalysts were studied. The interfacial electronic states of the photocatalysts were investigated through their C K-edge near-edge X-ray-absorption fine-structure (NEXAFS) spectra. Based on the in situ NEXAFS spectra measured with and without illumination, a mechanism about the transport of photoelectron from AgI to graphene through BiOI is proposed for the photocatalytic H2 production process. The incorporation of graphene restricted the three-dimensional self-assembly of BiOI nanocrystals and led to the formation of less extensively crystallized BiOI domains through a confined-space effect. Addition of AgNO3 precursor altered the crystal structure of BiOI from flower-like to horizontally stacked flat plates. The results of NEXAFS spectra, photoluminescence spectra and photocurrent tests reveal that the improved photocatalytic activity of the AgI-BiOI-graphene photocatalyst is attributable to the interfacial interaction among AgI, BiOI and graphene, which enhanced the separation of photogenerated electrons to generate H2. AgI-BiOI-graphene photocatalyst was a stable photocatalyst for the production of H2. After three cycles, 86 % activity of recycled photocatalysts was retained.
关键词： X-ray absorption spectra,Near edge X-ray absorption fine structure,Interfacial electronic states,Photocatalytic H2 production,BiOI
更新于2025-09-10 09:29:36
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Synergistic Photocatalytic-Photothermal Contribution to Antibacterial Activity in BiOI-Graphene Oxide Nanocomposites
摘要： The threat of environmental microbial contamination to the health of human beings has arisen particular attention. In order to explore the synergistic effect of photocatalytic and photothermal process to the antibacterial property, a stably combined BiOI-graphene oxide (GO) nanocomposite was constructed and prepared through a facile solvothermal method. BiOI crystals were uniformly distributed on the GO nanosheets by the formation of Bi-C bond. Based on the various characterizations, the great surface area, the high light harvesting with extension into NIR region and the efficient transfer of photo-induced electrons by the conductivity of GO was demonstrated, which was beneficial for the photocatalytic antibacterial activity. More importantly, the photothermal effect of GO raise the temperature of BiOI-GO composite with high photothermal conversion efficiency and induced the photo-generated electrons from BiOI crystals to obtain more energy and higher carrier mobility. Conversely, the temperature elevation of BiOI-GO composite improved its capability of light absorption and separation of photo-induced charges. As a result, BiOI-GO composite presented the synergistic photocatalytic-photothermal effect to the improvement of antibacterial property for Acinetobacter baumannii with the higher efficiency of TOC removal and leakage of K+ ions, in comparison to the individual photocatalytic process. Thus, the synergistic photocatalytic-photothermal contribution of BiOI-GO composite will provide a significance for the potential application of environmental disinfection in the future.
关键词： Antimicrobial activity,Synergistic photocatalytic-photothermal contribution,BiOI-graphene oxide,Nanocomposite
更新于2025-09-10 09:29:36