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Concise fabrication of 3D rose-like BiOBrxI1?x with exceptional wide spectrum visible-light photocatalytic activity
摘要： In this work, 3D rose-like BiOBrxI1-x photocatalysts with highly efficient visible-light-driven photocatalytic activities were successfully prepared via acetic acid assisted hydrolysis within 15 min at room temperature. The crystal structure, morphology, surface area, composition, interfacial charge separation, band gaps of BiOBrxI1-x solid solutions are characterized by XRD, SEM, HRTEM, BET, XPS, photocurrent and UV-vis DRS. Besides, the photocatalytic properties including degradation, mineralization and reusability of the BiOBr0.8I0.2 were evaluated by bisphenol A (BPA), rhodamine B (RhB) and methyl Orange (MO) as the target pollutant compounds under visible light. Results shows that the larger BET surface area, 3D rose-like morphology, favorable (110) exposed reactive surface, suitable band gap and adequate potential of the valence band give the positive impact on the exceptional visible photocatalytic activity of BiOBr0.8I0.2, which exceeded other reported BiOX-based solid solutions. This work would enlighten an effortless and feasible strategy to fabricate high efficiency catalysts, yet push the forward pace of the photocatalytic practical application.
关键词： BiOBrxI1-x,Visible light,Facile fabrication,Photocatalyst,Solid solution
更新于2025-09-19 17:15:36
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Visible-light-driven Ag/Bi <sub/>3</sub> O <sub/>4</sub> Cl nanocomposite photocatalyst with enhanced photocatalytic activity for degradation of tetracycline
摘要： In this study, a novel Ag/Bi3O4Cl photocatalyst has been synthesized by a facile photodeposition process. Its photocatalytic performance was evaluated from the degradation of tetracycline (TC) under visible light irradiation (λ > 420 nm). The 1.0 wt% Ag/Bi3O4Cl photocatalyst could significantly enhance the degradation of TC compared with pure Bi3O4Cl, with the degradation level reaching 94.2% in 120 minutes. The enhancement of photocatalytic activity could be attributed to the synergetic effect of the photogenerated electrons (e?) of Bi3O4Cl and the surface plasmon resonance (SPR) caused by Ag nanoparticles, which could improve the absorption capacity of visible light and facilitate the separation of photogenerated electron–hole pairs. In addition, electron spin resonance (ESR) analysis and trapping experiments demonstrated that the superoxide radicals (?O??), hydroxyl radicals (?OH) and holes (h?) played crucial roles in the photocatalytic process of TC degradation. The present work provides a promising approach for the development of highly efficient photocatalysts to address current environmental pollution, energy issues and other related areas.
关键词： photocatalyst,surface plasmon resonance,Ag/Bi3O4Cl,tetracycline degradation,visible light
更新于2025-09-19 17:15:36
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ZnO-Bi2O3/graphitic carbon nitride photocatalytic system with H2O2-assisted enhanced degradation of Indigo carmine under visible light
摘要： Indigo carmine in aqueous solution was effectively degraded using ZnO-Bi2O3/Graphitic Carbon Nitride heterojunction structure by visible light/H2O2 system. The mechanism of photocatalytic degradation of Indigo carmine shows the responsible species for the degradation of Indigo carmine in the ZnO-Bi2O3-xC3N4/H2O2/visible light system (x = 0, 1, 2, and 3) is the hydroxyl radicals which were generated from the reaction of e? and h? with H2O2. Under optimal conditions, ZnO-Bi2O3-2C3N4/H2O2/Vis system degraded more than 93% of Indigo carmine in 180 min. Besides, the kinetic of the photocatalytic process was detailed. These results demonstrate that the ZnO-Bi2O3-2C3N4/H2O2/visible light system may become a promising approach to achieve efficient environmental remediation as an environmentally friendly oxidant.
关键词： Indigo carmine,Hydroxyl radicals,Mineralization,Photocatalyst,Degradation
更新于2025-09-19 17:15:36
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Recent progresses in the design of BiVO4-based photocatalysts for efficient solar water splitting
摘要： Photocatalysis and photoelectrocatalysis are both considered as promising routes to solve energy and environmental crises. Particularly, photoelectrochemical (PEC) water splitting has been extensively studied in the search for sustainable ways of converting solar energy into chemical energy to produce energy-dense fuel with minimal carbon footprint. Bismuth vanadate (BiVO4) has attracted a lot attention in recent years due to its visible-light activity, favorable conduction and valence band edge positions, and low-cost facile synthesis route. However, BiVO4 still suffers from low carrier separation efficiency and slow oxygen evolution kinetics on its surface. To overcome these weaknesses, various modification strategies, including nanostructural morphology control, element doping, heterostructures (particularly Z-scheme), plasmonic enhancement and surface passivation, have been proposed and implemented to improve its PEC activity. This short review summarizes the most recent advances on the designs of BiVO4-based photocatalysts and photoanodes. Some of the best-performing BiVO4–based photo-electrode structures to date are demonstrated, and the critical parameters that contribute to these outstanding performances are discussed.
关键词： Solar energy harvesting,BiVO4,Photocatalyst,Photoelectrochemical water splitting
更新于2025-09-19 17:15:36
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Elucidating Charge Separation in Particulate Photocatalysts Using Nearly-Intrinsic Semiconductors with Small Asymmetric Band Bending
摘要： Photocatalytic water splitting using particulate suspensions is a promising approach for achieving large-scale production of renewable hydrogen fuels. Previous studies have hypothesized that band energy levels of such photocatalysts in water are both flat and symmetrical, and the charge separation in such photocatalysts is driven by random charge carrier diffusion. However, it is not well understood how the observed asymmetry of carrier diffusion is achieved during photocatalysis. To fully understand this charge separation process, we used double-side polished, intrinsic silicon as a model light absorber and manipulated the direction of charge-carrier diffusion using combinations of carrier-selective contacts. Degenerately p-type doped and n-type doped silicon, along with as-grown and annealed TiO2 overlayers grown by atomic layer deposition, were used as carrier selective back and front contacts, respectively. The protective TiO2 layers along with nickel oxide co-catalysts enabled bi-functional, stable silicon photoelectrodes for photoelectrochemical hydrogen evolution and water oxidation in alkaline solution. A device simulation was applied to analyse the experimental results and further gain understandings on the charge separation process in photocatalysts involving semiconductor/liquid junctions. Combined experimental and simulation study indicated that the contacts established asymmetric band bending inside the intrinsic silicon layer and drove the directional charge separation, primarily carrier diffusion. By scaling down the thickness of the silicon layer in the simulation, analogies of charge separation in particulate photocatalysts can be drawn. Based on the understandings from intrinsic silicon, we further revealed that photocatalysts generally do require asymmetric band bending to drive diffusional charge separation, and that a small band edge offset of 0.45 eV between reductive and oxidative catalytic sites can build a sufficient, steady-state photovoltage of over 1.23 V for overall water splitting by using a model SrTiO3 absorber. It provides an insightful guidance for designing efficient and stable particulate photocatalysts especially those using Si and III-V semiconductors with protective layers such as TiO2.
关键词： Carrier-selective contact,Particulate photocatalyst,Charge separation
更新于2025-09-19 17:15:36
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The Use of TiO2-SiO2 in Photocatalytic Process to Degrade Toxic and Dangerous Waste
摘要： This study was conducted to investigate the use of TiO2 immobilized on SiO2 (TiO2-SiO2) in a photocatalytic process to degrade toxic industrial waste, phenol, linear alkylbenzene sulfonate (LAS), and Cr(VI), which is dangerous for humans and the environment. Titanium dioxide (TiO2), as a photocatalyst, can make the solution become turbid. Thus, TiO2-SiO2 was used to increase the possibility of ultraviolet (UV) transmission. The phenol and LAS levels were measured with the Indonesian National Standard (INS) while the Cr(VI) level was determined with the colorimetric method. The activity test for the catalyst in suspension and immobilization against phenol showed that TiO2-SiO2 was more active than TiO2. By using the photocatalytic process with the TiO2-SiO2 photocatalyst for 8 h, degradation of phenol and LAS reached 50% as a single compound and 12% as a mixture. However, TiO2-SiO2 did not decrease Cr(VI).
关键词： TiO2-SiO2,photocatalyst,LAS,Cr(VI),phenol
更新于2025-09-19 17:15:36
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Significant enhancement of stability for visible photocatalytic overall water splitting by assembling ultra-thin layer of NiO over Zn1-xCdxSX
摘要： Solar light driven water splitting into hydrogen and oxygen using visible light active photocatalyst has been considered as a clean, green, and renewable route to solar energy conversion and storage. Although Zn1-xCdxS catalyst shows comparatively higher activity for photocatalytic hydrogen generation under visible light irradiation, it suffers serious photocorrosion during the photocatalytic reaction. Deposition of protection layer over Zn1-xCdxS catalyst is believed to be an effective way to inhibit such photocorrosion. Nevertheless, seldom of protection layer exhibits satisfied catalytic properties for hydrogen evolution while presents good protection ability. In this work, a new Zn1-xCdxS photocatalyst has been developed for water splitting under visible light illumination by assembled an ultra-thin NiO layer over Zn0.8Cd0.2S via in-situ photodeposition method. By this strategy, NiO/Zn0.8Cd0.2S showed significant higher activity than Pt/Zn0.8Cd0.2S under same conditions without photocorrosion. The AQE of 0.66% for hydrogen evolution at 430 nm has been achieved and multi-cycle stability has been accomplished up to 12 hours without significant decay. Moreover, the strong electronic coupling between NiO layer and Zn1-xCdxS promoted efficient charge separation and migration.
关键词： Overall water splitting,sulfide semiconductor photocatalyst with thin NiO catalytic layer,enhanced charge separation and migration,significant enhanced stability,anti-photocorrosion
更新于2025-09-19 17:15:36
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Photoinduced atom transfer radical polymerization of methyl methacrylate with conducting polymer nanostructures as photocatalyst
摘要： Light-mediated control/living radical polymerization (CLRP) provides a convenient method to synthesize polymers with controlled molecular weight and narrow molecular weight distribution. However, high-energy wavelengths (such as UV light) and blue light are needed to initiate the polymerization, leading to unwanted side reactions. To overcome these defects, the use of long-wavelength light for light-mediated CLRP is highly desirable. In this work, photoinduced atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was successfully carried out for the synthesis of polyMMA (PMMA) with predictable molecular weights (Mn,GPC) and narrow molecular weight distribution (Mw/Mn). This was achieved using one-dimensional nanopoly(diphenyl butadiyne) (nanoPDPB) as photocatalyst, which activated the dormant alkyl bromides initiator to reversibly produce propagating radicals at ambient temperature. Initiation and termination of polymerization were regulated by periods of light. The polymerization of MMA was accomplished by the radicals generated in the redox reaction of nanoPDPB with EBP. Both 1H nuclear magnetic resonance (1H NMR) spectroscopy and chain-end extension polymerization show highly preserved bromine chain-end functionality in the synthesized PMMA. nanoPDPB displays remarkable photophysical properties in the visible light region. The polymerization of MMA followed the first-order kinetics and the evolution of the Mn,GPC versus monomer conversion and Mw/Mn demonstrated the well-controlled polymerization process. The living character of heterogeneous photomediated ATRP with nanoPDPB as photocatalyst was successfully confirmed.
关键词： Poly(diphenyl butadiyne),Control/living radical polymerization,Living radical polymerization,Photocatalyst,Atom transfer radical polymerization
更新于2025-09-19 17:15:36
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Perspective on construction of heterojunction photocatalysts and the complete utilization of photogenerated charge carriers
摘要： Semiconductor photocatalysis has received tremendous attention as a promising way for solving the worldwide energy and environment issues. Many efforts have been devoted to developing distinctive morphology and various semiconductor-based composite photocatalysts for enhancing photocatalytic activity in recent years. However, it is still a great challenge and imperative to profoundly understand the transfer mechanisms and to realize complete utilization of photoexcited charge carriers. This perspective for the first time highlights the inner impetus of the photogenerated charge carrier migration (band-band and Z-scheme transfers) over composite photocatalysts. The notion of relative p-n junction for photocatalysis and the corresponding design principle of Z-scheme photocatalysts are introduced first. Then, simultaneous utilization of photogenerated electrons and holes for photocatalytic selective redox syntheses in one reaction system is recommended. The proposed reaction systems have characteristics of the environmentally friendly, atom economy, synergistic effect and high efficiency. Finally, the challenges and opportunities of photocatalysis are outlined and a perspective is given. We hope that the perspective review could give an inspiration for the fundamental research and guide the research direction of photocatalysis.
关键词： Z-scheme,Inner impetus,Photocatalytic redox,Heterojunction photocatalyst,Relative p-n junction
更新于2025-09-19 17:15:36
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The preparation of spherical mesoporous g-C3N4 with highly improved photocatalytic performance for H2 production and rhodamine B degradation
摘要： Spherical mesoporous graphitic carbon nitride (g-C3N4) was successfully prepared through spherical mesoporous silica as sacrificial templates, and analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analyzer, N2 adsorption-desorption isotherm, BET, UV-vis diffuse reflectance spectra and photoluminescence spectra. Experimental results indicated that as-prepared g-C3N4 exhibited spherical morphology with high surface area due to the introduced porous structure, which made the as-prepared g-C3N4 possess much higher activity than the bulk g-C3N4 for producing H2 and decomposing rhodamine B (RhB) under visible light, and it also kept excellent recycling activity. Hence, this investigation provided a simple strategy for the fabrication of porous special morphology graphitic carbon nitride with excellent photocatalytic activity.
关键词： Visible light,spherical mesoporous g-C3N4,Photocatalyst,Photocatalytic activity
更新于2025-09-19 17:15:36