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Influence of Modification Amount, Reactant Concentration and pH Value on the Photocatalytic Activity of Ionic Liquid Modified TiO2 Under Visible Light
摘要： Ionic liquid ([Bmim]OH, [Bmim]Br, [Bmim]BF4) modified TiO2 catalysts were prepared by hydrothrmal method. XRD and UV-visible spectra were used to characterize the prepared composite materials. Ionic liquid modification did not change the crystalline structure of TiO2 particles but reduced the particle size. [Bmim]OH modified TiO2 shows the obviously enhanced visible light absorption. The influence of ionic liquid types, modification amount, reactant concentration and pH value on the photocatalytic activity of TiO2 catalyst under visible light were investigated.
关键词： Visible light,Ionic liquid,Modification,Photocatalyst,TiO2
更新于2025-09-19 17:15:36
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Structure and Photocatalytic Activity of PdCrOx Cocatalyst on SrTiO3 for Overall Water Splitting
摘要： The mechanism of PdCrOx multi-component cocatalyst formation on SrTiO3 was investigated using transmission electron microscopy, X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy. The PdCrOx/SrTiO3 samples were synthesized by a photodeposition method under UV light irradiation (λ > 300 nm) for various time periods (0–5 h). The fine structure and valence state of the Pd species of PdCrOx nanoparticles were varied from Pd oxide to a mixture of metallic Pd and oxidized Pd species with an increase in the irradiation time. The overall water-splitting activity of PdCrOx was strongly dependent on the photoirradiation time during deposition. Although longer photoirradiation time during preparation did not influence the H2 evolution activity of PdCrOx/SrTiO3 from aqueous methanol solution, it was effective in suppressing the O2 photoreduction activity, which is one of the backward reactions during overall water splitting.
关键词： cocatalyst,semiconductor photocatalyst,water splitting
更新于2025-09-19 17:15:36
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Photocatalytic Degradation of Methylene blue with Synthesized rGO/ZnO/Cu
摘要： In order to observe photocatalysts reactions, rGO/ZnO/Cu nano-structure was synthesized through total reflux combined hydrothermal method. The effects of adding rGO and Cu doping on ZnO lattice were assessed. FE-SEM, TEM, EDX analysis, and XRD tests were used to study the morphology and particle size of the catalyst. The XRD-SAXS verified the crystallinity of the catalysts. FTIR and Raman spectroscopy characterized the mineral oxide-GO bonds also DRS was applied to study the band gap. Photocatalytic degradation efficiency was investigated by methylene blue solution and 25 mg photocatalyst is the best dosage for degradation.
关键词： DRS,Photocatalyst,XRD,Zinc oxide,Graphene oxide
更新于2025-09-19 17:15:36
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Recent Developments about Conductive Polymer Based Composite Photocatalysts
摘要： Conductive polymers have been widely investigated in various applications. such as polyaniline (PANI), polypyrrole (PPy), poly(3,4-ethylenedioxythiophene) (PEDOT)), and polythiophene (PTh) have been loaded with various semiconductor nanomaterials to prepare the composite photocatalysts. However, a critical review of conductive polymer-based composite photocatalysts has not been available yet. Therefore, in this review, we summarized the applications of conductive polymers in the preparation of composite photocatalysts for photocatalytic degradation of hazardous chemicals, antibacterial, and photocatalytic hydrogen production. Various materials were systematically surveyed to illustrate their preparation methods, morphologies, and photocatalytic performances. The synergic effect between conductive polymers and semiconductor nanomaterials were observed for a lot of composite photocatalysts. The band structures of the composite photocatalysts can be analyzed to explain the mechanism of their enhanced photocatalytic activity. The incorporation of conductive polymers can result in signi?cantly improved visible-light driven photocatalytic activity by enhancing the separation of photoexcited charge carriers, extending the light absorption range, increasing the adsorption of reactants, inhibiting photo-corrosion, and reducing the formation of large aggregates. This review provides a systematic concept about how conductive polymers can improve the performance of composite photocatalysts.
关键词： synergic effect,degradation,photo-corrosion,photogenerated electron,antibacterial,hydrogen production,photocatalyst,conductive polymer
更新于2025-09-19 17:15:36
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Decoration of carbon dots over hydrogen peroxide treated graphitic carbon nitride: Exceptional photocatalytic performance in removal of different contaminants under visible light
摘要： The development of novel photocatalysts with considerable activity for completely removal of different pollutants from the environment is a dominating goal of modern chemistry. In this study, carbon dots (CDs) were adhered to the graphitic carbon nitride activated by hydrogen peroxide (ag-C3N4) to fabricate photocatalysts with exceptional ability upon visible-light illumination. Interestingly, the BET surface area, visible-light absorption characteristics, and electron-hole separation yield of the pristine g-C3N4 were improved after activation with H2O2 and decoration of CDs. The binary nanocomposite was used for degradation of MB, RhB, fuchsine, and phenol and photoreduction of Cr(VI) under visible light. The nanocomposite exhibited excellent photocatalytic performance with 100% removal of RhB in 60 min, which is almost 34.7 folds as premier as the pristine g-C3N4. Reactive species scavenging measurements displayed that ?O2?, ?OH, and h+ had significant roles for photodegradation of RhB. The possible mechanism was proposed regarding how activation with H2O2 and decoration of CDs improved the photocatalytic performance of g-C3N4. Also, stability of the composite was characterized through cyclic photocatalytic tests.
关键词： Graphitic carbon nitride,g-C3N4/CDs,Hydrogen peroxide treated g-C3N4,Visible-light-active photocatalyst
更新于2025-09-19 17:15:36
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Upgrading the photocatalytic achievement of g-C3N4 nanosheets along decoration with Ag@TiO2 nanospheres for the preparation of vitamin B3
摘要： In this investigation, synthesis of ternary heterojunctions made of g-C3N4 sheets decorated with Ag@TiO2 nanospheres was successfully achieved. The reaction was initially started by combustion routine adopting silica of mesoporous type as a template to fabricate mesoporous C3N4 of graphite-like structure. After that, g-C3N4 nanosheets were decorated with TiO2 nanospheres and then TiO2 nanospheres were doped with Ag. Ag@TiO2/g-C3N4 ternary heterojunctions having 140 m2 g?1 specific surface area were produced. The resultant heterojunctions acquired a limited bandgap (2.26 eV) in addition to 3.4 nm pore size. The resultant Ag@TiO2/g-C3N4 nanocomposites were tested applying the photo-catalytic preparation of vitamin B3. It was observed that vitamin B3 could be synthesized adopting mesoporous Ag@TiO2/g-C3N4 ternary heterojunctions with a higher rate (33 times) than that when pristine TiO2 was adopted. The greater photo-catalytic action of the synthesized heterojunction might be correlated to the favorable Vis light absorption as well as the large separation between es and positive holes produced from inclusion of Ti3+ self-doping. In addition, huge amount of active sites was offered owing to the mesoporous network nature of the resultant heterojunctions. Finally, the dopant Ag nanoparticles positively supported the photocatalytic activity by its surface plasma resonance effect.
关键词： Ag@TiO2/g-C3N4 ternary heterojunctions,Vitamin B3,Visible photocatalyst
更新于2025-09-19 17:15:36
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One-step <i>in situ</i> synthesis of BiOCl/(BiO) <sub/>2</sub> CO <sub/>3</sub> composite photocatalysts with exposed high-energy {001} facets
摘要： Tailoring the chemical composition and morphology of a composite photocatalyst is a key way to achieve superior photocatalytic activity. In this work, a simple method has been developed to controllably prepare BiOCl/(BiO)2CO3 composite photocatalysts with exposed {001} facets. The chemical composition and morphology of the BiOCl/(BiO)2CO3 composites can be easily tuned by simply changing the ethanol/water volume ratio in the initial reaction system. The precursor of guanidine hydrochloride not only acts as the source of chloride and carbonate ions to form the BiOCl/(BiO)2CO3 composites, but also acts as the crystal growth inhibitor to control the growth of BiOCl nanosheets. The composites exhibit superior photocatalytic activity towards the degradation of rhodamine B under visible light irradiation, which can be ascribed to the type-II band alignment and intimate interfacial contacts between BiOCl nanosheets and (BiO)2CO3 nanoparticles, as well as their exposed high-energy facets. Both the formation mechanism of the BiOCl/(BiO)2CO3 composite and the photocatalytic degradation mechanism have been investigated and proposed.
关键词： BiOCl/(BiO)2CO3 composite,solvothermal synthesis,exposed {001} facets,photocatalytic degradation,photocatalyst
更新于2025-09-19 17:15:36
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Alloyed Pd Ni hollow nanoparticles as cocatalyst of CdS for improved photocatalytic activity toward hydrogen production
摘要： Photocatalytic hydrogen evolution has been regarded as an efficient method for H2 production, in which the cocatalysts play a crucial role. In this work, two-dimensional (2D) snow-flake CdS was synthesized via a solvothermal method. PdeNi hollow alloy with different compositions were synthesized by a galvanic replacement method, and decorated on CdS surface. The structural microscopic and spectroscopic analysis demonstrated that the formation of PdNi hollow nanoparticles (HNPs) and the decoration of PdNi HNPs on CdS (PdNi/CdS). Photocatalytic hydrogen evolution reaction was performed under visible light irradiation (l ≥ 420 nm). Pd1Ni1/CdS exhibited higher photocatalytic H2 generation rate about 54 mmol/h/g with a quantum efficiency of 63.97% at 420 nm, which was 1.7-fold higher than that of Pd/CdS (32.4 mmol/h/g). The high photocatalytic performance for Pd1Ni1/CdS was mainly attributed to the strong interaction between Pd1Ni1 HNPs and CdS, and the formation of unique hollow structure of PdNi alloy with porous nature which provided more active sites for H2 evolution. Additionally, the synergistic effect between Pd and Ni, as well as the 2D morphology of CdS enhance the mobility of photo-generated charge carriers which minimize their recombination in turn enhance the photocurrent and photocatalytic performance of solar water splitting reaction.
关键词： PdNi hollow NPs,Hydrogen production,Photocatalyst,CdS
更新于2025-09-19 17:15:36
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Fabrication of branched-TiO2 microrods on the FTO glass for photocatalytic reduction of Cr(VI) under visible-light irradiation
摘要： It is important to prepare a visible-light responsive photocatalyts, which has enhanced absorbance in the range of visible-light. In addition, metal nanoparticles deposited on TiO2 induced the localized surface plasmon resonance (LSPR) effect of Au nanoparticles (AuNPs), and thus enhanced the photocatalytic activity. Herein, TiO2 microrods with nano-branch (B-TiO2) on the fluorine-doped tin oxide glass (FTO) was prepared by hydrothermal method, and AuNPs was deposited on the B-TiO2. Its photocatalytic activity was evaluated by reduction of toxic Cr(VI) to less-toxic Cr(III) under visible-light irradiation. AuNPs/B-TiO2/FTO was successfully photocatalytic reduced target ions and Cr(III) ions were also removed from aqueous phase.
关键词： reduction of Cr(VI),TiO2,Photocatalyst,FTO glass,visible-light-driven
更新于2025-09-19 17:15:36
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Enhanced photocatalytic activity of potassium-doped titania photocatalyst films with nanosheet structure
摘要： Potassium-doped titania (K-doped TiO2) films had been prepared by molten-salt treatment in KNO3 for Ti-TiC coatings, containing different amount of TiC, in order to achieve enhanced activity of the films. When the amount of TiC is lower than 40%, the partial surface morphology of K-doped TiO2 films clearly shows a nanosheet structure, and the formed nanosheets could increase the accessible surface area. The results show that K-doped TiO2 with composite crystals has formed with different amount of TiC, and the relative Raman peak intensity of Ti-O-K bonding is highest for 40% TiC. Even avoiding high adsorption of K-doped TiO2 films, the films exhibit excellent and stable photocatalytic activity. With increasing the amount of TiC, the photocatalytic activity of K-doped TiO2 films first increases then decreases, reaching the highest for 40% TiC.
关键词： nanosheet,K-doped TiO2,photocatalytic activity,photocatalyst films,molten salt of KNO3
更新于2025-09-19 17:15:36