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Enhanced photocatalytic activity based on TiO <sub/>2</sub> hollow hierarchical microspheres/reduced graphene hybrid
摘要： A novel TiO2 hollow hierarchical microspheres/reduced graphene oxide (TiO2 HHMs/rGO) hybrid was prepared by a facile and efficient two-step solvothermal synthesis method. The TiO2 HHMs with the size ～500 nm were uniformly distributed on the surface of rGO nanosheets. The as-prepared TiO2 HHMs/rGO hybrid is stable and exhibits a significantly higher photocatalytic activity (97.8%) for 40 ml of 10 mg/Rhodamine B (RhB) solution than that of the pure TiO2 microspheres (75.2%) and Degussa P25 (53.6%). The rGO nanosheet acts as a microelectrode for rapid accepting and separating the photogenerated electron on surface, which effectively slow the recombination rate of electrons and holes, and then effectively enhance the photocatalytic activity of the hybrid. The as-prepared novel TiO2 HHMs/rGO hybrid shows great promising for practical photocatalytic applications.
关键词： TiO2 hollow hierarchical microspheres/reduced graphene oxide (TiO2 HHMs/rGO) hybrid,enhancement,photocatalytic activity,two-step solvothermal synthesis
更新于2025-09-23 15:21:01
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WO3 quantum dots enhanced the photocatalytic performances of graphene oxide/TiO2 films under flowing dye solution
摘要： It is maximal difficult for the application of powdery nanocatalyst in sewage treatment to retrieve powder catalyst from the reaction solution. In this paper, after synthesized graphene oxide/WO3 quantum dots/TiO2 (GOWT) composite with high catalytic performance under visible light, GOWT composite powder was used to fabricate GOWT films by using Al(H2PO4)3 as adhesive and cheap gauze as substrates, and studied the effect of Rhodamine B (RhB) concentration on the removal ability of GOWT film by evaluating flowing liquid of RhB. Experimental results show that GOWT films possess higher photocatalytic efficiency in contrast to graphene oxide/TiO2 (GOT) films under sunlight, and the degradation rate of RhB is 2.6 times as GOT films under UV light. Furthermore, GOWT film possess higher removal ability than GOT film under high concentration, but completely degrade RhB under flowing solution of low concentration, which is ascribed to the unique structure and superior performance of WO3 quantum dots. Besides, GOWT films have the potential application in sewage treatment without further contamination.
关键词： Thin films,Graphene oxide/TiO2,WO3 quantum dots,Photocatalytic degradation
更新于2025-09-23 15:19:57
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Polyurethane-Supported Graphene Oxide Foam Functionalized with Carbon Dots and TiO2 Particles for Photocatalytic Degradation of Dyes
摘要： The design and optimal synthesis of functional nanomaterials can meet the requirements of energy and environmental science. As a typical photocatalyst, TiO2 can be used to degrade dyes into non-toxic substances. In this work, we demonstrated the in-situ hydrothermal synthesis of carbon quantum dots (CQDs)-modified TiO2 (CQDs/TiO2) particles, and the subsequent fabrication of three-dimensional (3D) graphene oxide (GO) foam doped with CQDs/TiO2 via a facile strategy. By making full use of the up-conversion characteristics of CQDs, the synthesized CQDs/TiO2 exhibited high catalytic activity under visible light. In order to recover the photocatalyst conveniently, CQDs/TiO2 and GO were mixed by ultrasound and loaded on 3D polyurethane foam (PUF) by the multiple impregnation method. It was found that GO, CQDs/TiO2, and PUF reveal synergistic effects on the dye adsorption and photocatalytic degradation processes. The fabricated 3D CQDs/TiO2/GO foam system with a stable structure can maintain a high photocatalytic degradation efficiency after using at least five times. It is expected that the fabricated 3D materials will have potential applications in the fields of oil water separation, the removal of oils, and the photothermal desalination of seawater.
关键词： carbon quantum dots,graphene oxide,TiO2,photocatalysis,water purification
更新于2025-09-19 17:15:36
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Reduced Graphene Oxide/TiO2 Nanocomposite: From Synthesis to Characterization for Efficient Visible Light Photocatalytic Applications
摘要： In this study, a green and facile thermal reduction of graphene oxide using an eco-friendly system of D-(+)-glucose and NH4OH for the preparation of reduced graphene oxide was described. The obtained reduced graphene oxide dispersion was characterized by SEM, Dynamic Light Scattering, Raman and X-Ray Photoelectron Spectroscopy. TiO2 nanoparticles and reduced graphene oxide nanocomposites were successively prepared and used in the preparation of heterogeneous photocatalysts that were characterized by Atomic Force Microscopy and Photoluminescence Spectroscopy and subsequently tested as visible light photocatalysts for the photodegradation of Alizarin Red S in water as target pollutant. Obtained results of photocatalytic tests regarding the visible light photocatalytic degradation of Alizarin Red S demonstrated that the use of reduced graphene oxide in combination with TiO2 led to a significant improvement for both adsorption of Alizarin Red S on the catalyst surface and photodegradation efficiencies when compared to those obtained with not doped TiO2.
关键词： visible light photocatalysis,wastewater treatment,reduced graphene oxide,TiO2,glucose-NH4OH
更新于2025-09-19 17:15:36
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Polydopamine nanospheres loaded with l-cysteine-coated cadmium sulfide quantum dots as photoelectrochemical signal amplifier for PSA detection
摘要： A sandwich-type photoelectrochemical (PEC) immunosensor was constructed for sensitive detection of prostate specific antigen (PSA). It was based on electrochemically reduced graphene oxide-TiO2 (ERGO-TiO2) as photoelectrochemical platform to immobilize capture antibody (Ab1). Then, quinone-rich polydopamine nanospheres (PDANS) loaded detection antibody (Ab2) and photocurrent signal label, L-cysteine-coated cadmium sulfide quantum dots (CdSQDs). ERGO-TiO2 displayed greatly improved photocurrent response to white light. CdSQDs conjugated with PDANS further amplified photocurrent signal because of the good conductivity of PDANS and ERGO. The increased photocurrent showed a linear correlation with PSA in the concentration range from 0.02 pg mL?1 to 200 ng mL?1 with the detection limit of 6.8 fg mL?1. It also revealed high selectivity and good stability.
关键词： Electrochemically reduced graphene oxide-TiO2,Polydopamine nanospheres,Photoelectrochemical immunosensor,L-cysteine-coated cadmium sulfide quantum dots,Prostate specific antigen
更新于2025-09-12 10:27:22
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Photodegradation of Methylene Blue by a ternary magnetic TiO2/Fe3O4/Graphene oxide nanocomposite under visible light
摘要： In this study, a facile hydrolysis method was employed for the synthesis of magnetic TiO2/Fe3O4/Graphene oxide nanocomposites with different amounts of graphene oxide (0.015, 0.03, 0.06, and 0.12 gr), which can be easily separated by application of an external magnetic field. The prepared nanocomposites were evaluated using XRD, FTIR, FESEM/EDX, TEM and UV-Vis DRS techniques. Morphological characterization showed that size of TiO2 nanoparticles (NPs) and Fe3O4 NPs is nearly 6.0-7.0 nm 27.81 nm, respectively, and they both are coated on the surfaces of graphene oxide. XRD results indicated the presence of anatase TiO2 and inverse cubic spinel Fe3O4 in the nanocomposite structure. Photoactivity of the synthesized nanocomposites in degradation of methylene blue (MB) was investigated by UV irradiation and visible light. According to the results, ternary nanocomposite containing 0.12 gr of graphene oxide can provide the highest photocatalytic MB degradation. Degradation percentages (DP%) of ~ 82% under UV irradiant and 76% under visible light were achieved after 90 min irradiation. Therefore, it is possible to use TiO2/Fe3O4/GO nanocomposite in the photodegradation of MB and other organic pollutants owing to its noticeable visible light-induced photocatalytic performance and also magnetic properties (which help their recycle).
关键词： Degradation,Methylene blue,Graphene oxide,TiO2,Fe3O4
更新于2025-09-11 14:15:04