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Visible-light-driven Photocatalytic Removal of PPCPs using Magnetically Separable Bismuth Oxybromo-iodide Solid Solutions: Mechanisms, Pathways, and Reusability in Real Sewage
摘要： In testing a series of bismuth oxybromo-iodide (BiOBrxI1-x; 0 ≤ x ≤ 1) solid solutions, BiOBr0.9I0.1, due to its superior charge-carriers separation, exhibited the best performance in the visible-light-driven photocatalytic degradation of pharmaceutical and personal care products (PPCPs). Subsequently, its superparamagnetic version, BiOBr0.9I0.1/Fe3O4@SiO2, possessing a mesoporous hierarchical morphology, was solvothermally developed, and completely degraded the two model PPCPs, ibuprofen and benzophenone-3, in 1 and 2 h, respectively. Scavenger studies revealed that the ibuprofen degradation was dominated by e–, ?O2–, and h+, while the benzophenone-3 degradation was dominated by e– and ?O2–. Hydroxylation, decarboxylation, and demethylation were found to be the major reactions involved in the degradation pathways. The aquatic toxicity of the intermediates ― estimated using the ECOSAR software ― was found to be lower than for the parent PPCP molecules, indicating a reduced environmental risk after photocatalytic degradation. The solution matrix study elaborated the varying extent of the interacting roles of the co-present anions, cations, and NOM. The reusability and stability of BiOBr0.9I0.1/Fe3O4@SiO2 was examined in real secondary treated sewage in a prototype photocatalytic reactor equipped with a magnetic separator. Due to the interferences and unwanted interactions caused by the co-present constituents in secondary treated sewage, a gradual loss in the photocatalytic performance of BiOBr0.9I0.1/Fe3O4@SiO2 was observed during consecutive rounds of recycling.
关键词： visible-light-driven photocatalysis,magnetic photocatalyst,Bismuth oxyhalide,pharmaceuticals and personal care products,solid solution
更新于2025-09-19 17:15:36
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UV light enabled photocatalytic activity of α-Fe2O3 nanoparticles synthesized via phase transformation
摘要： In this work, hematite (a-Fe2O3) nanoparticles (NPs) were synthesized by co-precipitation method involving chemical precipitation of aqueous salts of iron (Fe2+/Fe3+) using NaOH aqueous solution. The synthesis of a-Fe2O3NPs via phase transformation and its photocatalytic application under ultra violet (UV) light is rarely reported. The maximum removal of methylene blue (MB) dye (92%) was achieved at pH 10 and 200 mg amount of catalyst, whereas the concentration of dye was 10 ppm. The removal percentage of MB dye was found to vary with pH of the solution, concentrations of dye, and amount of a-Fe2O3 NPs for certain interval of time. Moreover, plot of ln(Ct/C0) Vs time exhibited almost a linear relationship between them which suggested the pseudo-?rst order kinetics reaction of photocatalytic degradation of MB.
关键词： Hematite,Phase transformation,Nanoparticles,FTIR,UV irradiation,Photocatalyst
更新于2025-09-19 17:13:59
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Facile graft copolymer template synthesis of mesoporous polymeric metal-organic frameworks to produce mesoporous TiO2: Promising platforms for photovoltaic and photocatalytic applications
摘要： Mesoporous polymeric metal-organic frameworks (mesoporous polymeric MOFs) are prepared on fluorine-doped tin oxide (FTO) substrate using hydrophilic terephthalic acid as the ligands, titanium isopropoxide as polymeric MOF precursors, and amphiphilic graft copolymers (i.e., poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM) as structure-directing agents. The hydrophilic POEM chains in amphiphilic graft copolymers interact with the hydrophilic ligands and polymeric MOF precursors. Following thermal treatment at 500 °C, mesoporous polymeric MOFs are transformed to mesoporous TiO2 with high specific surface area and crystallinity, suitable for photovoltaic and photocatalytic applications. Solid-state dye-sensitized solar cells (ssDSSCs) and dye-sensitized solar cells (DSSCs) fabricated with mesoporous TiO2 photoanodes have efficiencies of 7.45 and 8.43 % at 100 mW/cm2, which is much higher than that of ssDSSCs and DSSCs with photoanodes of conventional TiO2 (5.36 and 7.14 %), respectively. The enhanced efficiency is attributed to good interconnectivity, larger surface area, and high porosity of the mesoporous TiO2, which results in suppressed interfacial charge recombination loss, enhanced electron transport, increased dye loading, and facilitated penetration of the electrolytes. Mesoporous TiO2 shows excellent activity as a photocatalyst for the degradation of humic acid under UV light irradiation.
关键词： Photocatalyst,Dye-sensitized solar cell (DSSC),Metal-organic framework (MOF),Graft copolymer,Titanium dioxide (TiO2),Polymerized ionic liquid,Mesoporous
更新于2025-09-19 17:13:59
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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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Laser irradiation for controlling size of TiO2-Zeolite nanocomposite in removal of 2,4-dichlorophenoxyacetic acid herbicide
摘要： This study has focused on the synthesis of TiO2-Zeolite nanocomposite through a sol-gel approach. The decrease in the size of the nanocomposite considers as a primary parameter to improve the photocatalytic activity. In this regards fabricated samples exposed to laser irradiation (532 nm) at four different time intervals in order to investigate the size variation of nanocomposite. FTIR, UV-Vis, XRD, DLS, SEM and EDX analysis were applied to characterize and determine the size of the products. Optimized nanocomposite sample, in term of the particle size, used for photodegradation of 2, 4-D herbicide from aqueous solution. Photodegradation carried out under UV- irradiation (12 W) and Xe lamp irradiation (200 W). Obtained results showed that laser irradiation time has a substantial effect on controlling the size of nanocomposite. Results from the photocatalyst study indicated that the elimination of 2, 4-D under the Xe lamp irradiation was higher compared to the UV-irradiation. Also, the ?nal synthesized nanocomposite exhibited higher catalytic activity for photodegradation of 2,4-D compared to pure Zeolite and pure anatase TiO2 samples. The reusability of TiO2-Zeolite nanocomposite was studied in four successive cycles to evaluate the removal of 2,4-D under UV- irradiation.
关键词： photocatalyst,laser irradiation,zeolite,nanocomposite,TiO2,2, 4-D
更新于2025-09-19 17:13:59
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Self-Assembled Protein/Carbon Nitride/Sulfur Hydrogel Photocatalyst For Highly Selective Solar Chemical Production
摘要： Artificial photosynthesis process is a nature inspired process that can convert solar energy to important value added chemicals. Here, we report the synthesis of a self-assembled protein and carbon nitride/sulfur hydrogel (Fmoc-D-PheA/g-C3N4/S) as a visible light active hydrogel photocatalyst for 86.78% reduced nicotinamide adenine dinucleotide (NADH) regeneration and 90.0% L-Glutamate production under solar light irradiation. The present work represents a new benchmark example for NADH regeneration and solar chemical production.
关键词： NADH regeneration,hydrogel photocatalyst,Carbon nitride
更新于2025-09-19 17:13:59
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Chemoselective photocatalytic oxidation of alcohols to aldehydes and ketones by nitromethane on titanium dioxide under violet 400 nm LED light irradiation
摘要： In this study, for the first time, nitroalkanes especially nitromethane, have been used as an electron acceptor for the highly chemoselective oxidation of alcohols in the presence of TiO2 photocatalyst under 400 nm LED irradiation. The reactions showed excellent selectivity for the production of aldehydes. Interestingly aldehydes such as benzaldehyde and p-methoxybenzaldehyde are stable in the reaction condition. In the case of the use of 2-nitropropane and 2-methyl-2- nitropropane, the product of imine, which is the result of the reaction of aldehyde with aliphatic amine, is also produced.
关键词： chemoselective oxidation,ketones,LED irradiation,aldehydes,nitromethane,TiO2 photocatalyst,nitroalkanes,alcohols
更新于2025-09-19 17:13:59
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SILICA a?? CARBON QUANTUM DOTS DECORATED TITANIUM DIOXIDE AS SUNLIGHT-DRIVEN PHOTOCATALYST TO DIMINISH ACETAMINOPHEN FROM AQUATIC ENVIRONMENT
摘要： The presence of pharmaceutical compound (i.e., acetaminophen) in aquatic environment has been declared as environmental issue since researchers found that it has potential risk to human health. Photocatalytic process as a promising method for waste degradation commonly employs titanium dioxide, TiO2. However, TiO2 has narrow light absorption and rapid charge recombination resulting in ineffective photocatalytic activity. In this study, silica – carbon quantum dots (Si-CQDs) from rice husk are decorated into TiO2 matrix through facile mixing approach to minimize the limitations of TiO2. Preliminary studies regarding TiO2 transformation and Si-CQDs incorporation in various amount were systematically investigated. It is observed that 1 wt% is the optimum amount of Si-CQDs in composite in order to maximize the photocatalytic ability of TiO2. Under sunlight irradiation, 1 wt% Si-CQDs/TiO2 composite is able to completely degrade 5 mg/L of acetaminophen within 240 min (33.3% faster than pure TiO2). The excellent performance of the composite is attributed to synergistic effect of Si-CQDs addition on TiO2 surface, which acted as photo sensitizer and electron trapper. Si-CQDs extend light absorption of TiO2 by reducing band gap energy from 3.20 to 3.12 eV, as confirmed by UV-Vis Diffuse Reflectance Spectroscopy (DRS) spectra. Photoluminescence (PL) spectra and N2 sorption isotherm reveal that Si-CQDs addition prolongs the lifetime of charge separation and improves surface area (17% larger than TiO2), respectively. The composite of Si-CQDs/TiO2 also demonstrates good stability which is beneficial for pharmaceutical waste removal in the future.
关键词： sunlight,photocatalyst,Titanium dioxide,acetaminophen,carbon quantum dots,pharmaceutical
更新于2025-09-19 17:13:59
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Noble-metal-free MoS2 nanosheet-coupled MAPbI3 photocatalyst for efficient and stable visible-light-driven hydrogen evolution
摘要： We report that MoS2 nanosheets (MoS2 NSs) as an cocatalyst in situ coupled with MAPbI3 leads to a highly efficient composite photocatalyst for visible-light-driven photocatalytic H2 evolution. The most efficient MAPbI3/MoS2 NSs exhibits a high H2 evolution rate (206.1 μmol h-1) in MAPbI3-saturated HI solution, which is 121 times higher than that of pristine MAPbI3 (1.7 μmol h-1) and greatly superior to that of MAPbI3/Pt/C (68.5 μmol h-1), and the composite is very stable for H2 evolution in 156 h reaction.
关键词： photocatalyst,MoS2 nanosheets,visible-light-driven,MAPbI3,hydrogen evolution
更新于2025-09-19 17:13:59
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Long lifetime g-C3N4 photocatalyst coupled with phosphorescent material working under dark condition
摘要： Existing photocatalysts suffer from decreased photocatalytic efficiency when illuminated at wavelengths beyond the UV region or in the absence of irradiation. To overcome this disadvantage, graphitic carbon nitride (g-C3N4), which is responsive to visible light, was coupled with a phosphorescent material (SEAD) that emits green light after irradiation is discontinued. The excited electron and holes in the as-made SEAD/g-C3N4 undergo slow recombination; thus, the material exhibited better performance than g-C3N4 based on photocurrent measurement. We demonstrated the performance of the samples via photodegradation experiments using three organic dyes; methylene blue (MB), methyl orange (MO), and rhodamine B (RhB). The results show that g-C3N4 coupled with the phosphorescent material exhibited better efficiency for photocatalytic degradation of organic dyes than g-C3N4 alone under dark condition as well as light irradiation. In addition, the decomposition of the dyes continued even after irradiation was discontinued, due to phosphorescence.
关键词： graphitic carbon nitride,Photocatalyst,recombination,degradation of organic dyes,phosphorescent material
更新于2025-09-19 17:13:59