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Controlled synthesis of Ag-doped CuO nanoparticles as a core with poly(acrylic acid) microgel shell for efficient removal of methylene blue under visible light
摘要： Nowadays, constructing a narrow bandgap nanocomposite photocatalyst that can degrade contamination under visible light is critical but challenging. In this report, poly (acrylic acid) microgel (PAA) based nanocomposites (Ag@CuO/PAA NC) were constructed via free radical solution polymerization by varying the concentration of silver-doped copper oxide nanoparticles (Ag@CuO NPs) from 0 to 12%. As prepared Ag@CuO and Ag@CuO/PAA were characterized by X‐ray diffraction spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray and X-ray photoelectron spectroscopy. The size of Ag@CuO NPs was found to be 30–50?nm. The photocatalytic activity of CuO is increased by Ag doping and C3 NPs show the best photodegradation of methylene blue (MB). Then, 4% of Ag@CuO nanoparticles were incorporated into PAA microgel, the resultant nanocomposite showed a drastic increase in photodegradation of MB. Ag@CuO/PAA NC completely degraded dye in only 30?min which was degraded up to 65% in 60?min. by Ag@CuO NPs. The successful combination of PAA with Ag@CuO boosts the photocatalytic activity because microgel provides a large surface to adsorb pollutants. Ag@CuO/PAA NC reused successfully for photodegradation of dye due to the recycling ability of microgels. This study gives a good insight into planning a significant visible‐light‐driven photocatalyst for environmental remediation.
关键词： photocatalytic degradation,methylene blue,Ag-doped CuO nanoparticles,visible light,poly(acrylic acid) microgel
更新于2025-09-19 17:13:59
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pH-Controlled photocatalytic abatement of RhB by an FeWO <sub/>4</sub> /BiPO <sub/>4</sub> p–n heterojunction under visible light irradiation
摘要： A novel p–n heterostructure of an FeWO4/BiPO4 nanocomposite was designed and synthesized through a simple hydrothermal method. Among all the nanocomposites prepared with different weight percentages of FeWO4, 30% FeWO4/BiPO4 (S3) showed the highest photocatalytic performance for the degradation of Rhodamine B and tetracycline under visible light irradiation. The degradation efficiency of RhB for the S3 sample was 87% under neutral conditions within 300 min but interestingly, at pH 3, 99% degradation efficiency was observed within 30 min with good recyclability. The enhanced photocatalytic performance should be due to the maximum electron–hole pair decoupling efficiency of the S3 catalyst. The mineralization of RhB during the catalytic process was detected by GC-MS. Consequently, based on the experimental results, a possible photocatalytic mechanism over the FeWO4/BiPO4 composite was anticipated, which indicated the substantial potential of the composite for the treatment of textile and pharmaceutical wastewater.
关键词： p–n heterojunction,Rhodamine B,tetracycline,visible light irradiation,FeWO4/BiPO4,photocatalytic degradation
更新于2025-09-16 10:30:52
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Heterojunction of BiPO <sub/>4</sub> /BiOBr photocatalysts for Rhodamine B dye degradation under visible LED light irradiation
摘要： BiOBr synthesized by alcoholysis precipitation is used in the preparation of BiPO4/BiOBr composites by adding H3PO4. Pristine BiOBr and a series of BiPO4/BiOBr composites have been successfully synthesized using an entirely room-temperature production process. X-ray powder diffraction, scanning electron microscopy, High-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV–vis absorption spectroscopy were used to investigated the bulk structure, surface morphology, element composition and optical properties of the samples. The degradation effect of different proportions of BiPO4/BiOBr composites, BiOBr and BiPO4 on Rhodamine B (RhB) was evaluated under visible LED light irradiation. Compared to pure BiOBr and BiPO4, the as-synthesized BiPO4/BiOBr composites showed enhanced performance, with 30% BiPO4/BiOBr composite showing the best performance, as it could degrade 95.66% of RhB (100 ml, 15 mg/L) within 120 min. The enhanced photocatalytic activity of BiPO4/BiOBr was attributed to the heterojunction formation between BiOBr and BiPO4 and efficient charge separation.
关键词： heterostructure,photocatalytic degradation,composites
更新于2025-09-16 10:30:52
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Study of the photocatalytic performance and carrier migration of reduced graphene oxide-modified infrared-responsive photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO
摘要： To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity. Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
关键词： Photocatalytic degradation,Characterization,BiOCl nanosheets,Reduced graphene oxide (rGO)
更新于2025-09-16 10:30:52
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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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Enhanced Photocatalytic Degradation of Levofloxacin by Fe-doped BiOCl nanosheets under LED light irradiation
摘要： In this research, Fe-doped BiOCl nanosheets were successfully synthesized through controlled hydrothermal method and applied in the degradation of levofloxacin (LVX) by sulfate radical-based photo-Fenton process. The conduction band of Fe-doped BiOCl was calculated as 2.77 eV compared to BiOCl (3.24 eV), and showed remarkable visible-LED-light driven photocatalytic activity with the expanded visible light absorption. Certain parameters were studied, with the addition persulfate (1 mM) and catalyst dosage (0.5 g L-1) at natural pH, the LVX reached over 95% degradation efficiency in 60 min during at least five successive experiments which displayed excellent catalytic activity and stability. LVX degradation was confirmed to depend on the formation of free reactive oxidant species through radical scavenger reagents and EPR analysis. On the basis of the experimental results and density functional theory calculations, the role of photocatalytic degradation mechanism of LVX degradation by the Fe-BiOCl sample was investigated. Moreover, the LVX degradation pathway was induced according to the intermediates detected by LC-MS. The results of this research demonstrated the good feasibility of Fe-doped BiOCl nanosheets which would enhance the utilization of photocatalysts under visible light irradiation.
关键词： LED light,Fe-BiOCl,levofloxacin (LVX),photocatalytic degradation
更新于2025-09-16 10:30:52
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Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide
摘要： The high crystallinity of graphene quantum dots-ZnO nanocomposites is considered to have a significant effect in improving the carrier lifetime for enhanced photocatalytic degradation. The graphene quantum dots-ZnO nanocomposites were synthesized by adding graphene quantum dots solution into starting precursors during the precipitation. Characterization was performed using various techniques. High crystallinity of graphene quantum dots-ZnO nanocomposites is obtained in terms of increased crystal size and decreased dislocation density. The improved crystallinity increases the carrier lifetime on the material surface for the functional improvement of photocatalytic material. Photocatalytic test of methylene blue and methyl orange was performed under UV irradiation. Degradation rate constant reaches the maximum value for both organic dyes for the appropriate preparing condition of graphene quantum dots-ZnO nanocomposites. The graphene quantum dots-ZnO nanocomposites were then applied to degrade commercial glyphosate herbicide contaminants for an agricultural wastewater treatment investigation. The investigation aims to demonstrate a facile useful way of herbicide contaminant reduction for the better health of farmers. The graphene quantum dots-ZnO nanocomposites show an enhancement of the photocatalytic process with improved degradation rate constant (23% increased) in comparison to pure ZnO. Therefore, this work demonstrates that graphene quantum dots-ZnO nanocomposites can be used as a photocatalytic material for degrading organic dyes and commercial herbicide contaminants owing to its low-cost and environmental-friendly properties.
关键词： graphene quantum dots,ZnO,organic dye,photocatalytic degradation,herbicide
更新于2025-09-12 10:27:22
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Ultrasound‐assisted nanoscaled supramolecular coordination polymer as an efficient recyclable catalyst for photocatalytic degradation of dye pollutants
摘要： An ultrasound‐assisted nanoscaled supramolecular coordination polymer (nanosized 1′) has been synthesized using a self‐assembly reaction of K3[Cu(CN)4] and hexamethylenetetramine in the presence of Me3SnCl under ambient conditions. Nanosized1′ was examined using elemental analysis, Fourier transform–infrared, scanning electron microscopy, transmission electron microscopy and X‐ray powder diffractions. It was structurally compared with the single crystal 3[Cu6(CN)7(C6H12N4)2(OH3)]; SCP 1. The photocatalytic activities of nanosized 1′ and SCP 1 toward different hazardous organic dyes were determined under ambient, UV‐light irradiation and ultrasonic conditions. SCP 1 and nanosized 1′ as heterogeneous nanoparticles catalysts exhibited high catalytic activity for degradation of Congo Red, Methyl Violet 2B and Methylene Blue dyes. The effects of operational parameters on catalytic degradation process, identification of the degradation products and recycling of the catalyst were also investigated. SCP 1 and nanosized 1′ are recyclable heterogeneous catalysts and can be reused with efficient activities. The mechanism of degradation using different scavenger techniques is proposed and discussed. The catalytic oxidation process is mainly caused by ?OH radicals.
关键词： photocatalytic degradation,nanoscaled supramolecular coordination polymer,hazardous organic dyes
更新于2025-09-12 10:27:22
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Photocatalytic Degradation of Gentian Violet Using BaxSr1-xFe0.5Co0.5O3-d
摘要： Perovskite oxides BaxSr1-xFe0.5Co0.5O3-δ (x = 0.2, 0.4) were synthesized by citrate method. The structures and the morphology of the prepared samples were characterized by X-ray diffraction and scanning electron microscopy. The photocatalytic degradation property of Gentian violet in aqueous solution was investigated using BaxSr1-xFe0.5Co0.5O3-δ as the photocatalysts. The effects of irradiation time, catalyst dose, initial concentration and pH value on the degradation were explored systematically under the irradiation of a 400 W high pressure mercury lamp. The optimum reacted conditions were that irradiation time was 60 and 80 min, catalyst dose 0.2 and 0.22 g in 100 mL10 mg/L Gentian violet solution using Ba0.2Sr0.8Fe0.5Co0.5O3-δ and Ba0.4Sr0.6Fe0.5Co0.5O3-δ, respectively, initial concentration and pH value were Gentian violet 5 mg/L and 3.08 for both photocatalysts.
关键词： Influence factors,Photocatalytic degradation,BaxSr1-xFe0.5Co0.5O3-δ,Gentian violet
更新于2025-09-11 14:15:04
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Photocatalytic Degradation of Acidic Black 10B of Aqueous Solution Using BaxSr1-xFe0.5Co0.5O3-d
摘要： Two kinds of perovskite BaxSr1-xFe0.5Co0.5O3-δ (x = 0.2, 0.4) were prepared by citrate method and were sintered at 850 °C for 8 h. The obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The photocatalytic degradation efficiency of acidic black 10B of aqueous solution was evaluated in different reaction conditions under the irradiation of UV. Several operational parameters affecting the photocatalytic degradation of acidic black 10B under the irradiation of UV were studied systematically,including irradiation time, photocatalyst dose, acidic black 10B initial concentration, pH value of initial acidic black 10B solution and amount of H2O2 (1 %) added. The results showed that perovskite-type BaxSr1-xFe0.5Co0.5O3-δ exhibited excellent photocatalytic properties.
关键词： Affecting parameters,Photocatalytic degradation,BaxSr1-xFe0.5Co0.5O3-δ,Acidic black 10B
更新于2025-09-11 14:15:04