RSC Advances
·
2014
·Vol. 4
·期 68
·36040-36045
·
IF 3.708
Yan Liu
Composites of titanium dioxide–reduced graphene oxide (TiO2–RGO) have been prepared via an efficient and facile hydrothermal reaction of graphene oxide and Ti(OH)4 in a ethanol–water solvent. The structure and composition of the composites have been characterized by X-ray diffraction, Scanning electron microscopy, Brunauer–Emmett–Teller specific area analysis, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy. The results showed that the TiO2–RGO composites exhibited a layered structure with well-dispersed anatase TiO2 on the surface of the reduced graphene oxide. Compared with the pure TiO2 nanoparticles, the composites had larger surface area, and extended the photoresponse range to the visible light region. The photocatalytic activity of the composites was much higher than that of TiO2 in the photodegradation of methyl orange (MO) under visible light irradiation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ranran Ding,Zhenhua Li,Chengyang Wang,Mingming Chen
In this work, yolk-shell MnCo 2 O 4 -TiO 2 microspheres were synthesized by a solvo-thermal method combined with a subsequent kinetic-controlled coating. The as-fabricated MnCo 2 O 4 -TiO 2 -50 composite shows remarkable electrochemical performance as an anode material for lithium-ion batteries, with a high specific capacity, superior cycle stability and excellent rate capabilities. At a current density of 100 mA g −1 , the composite exhibits a reversible specific capacity of 1271.5 mA h g −1 for up to 200 cycles, exhibiting stable cyclic performance. The outstanding electrochemical performance of MnCo 2 O 4 -TiO 2 -50 microspheres is due to its rational composition and structure. The porous yolk-shell structure buffers the volume change of the electrode material during charging/discharging, whereas the MnCo 2 O 4 core and TiO 2 shell synergistically assure stable cycling and satisfactory specific capacity.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2017
·
IF 1.342
Li-li ZHENG,Xin-yan XIAO,Yang LI,Wei-ping ZHANG
TiO 2 /WS 2 /g-C 3 N 4 composite photocatalysts were synthesized by a liquid-exfoliation-solvothermal method. In this process, the WS 2 /g-C 3 N 4 nano-sheets were prepared by liquid-exfoliation method from the bulk WS 2 and C 3 N 4 in the alcohol system, and then the TiO 2 nanoparticles (NPs) grew on the WS 2 /g-C 3 N 4 nano-sheets by in-situ synthesized technique. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic degradation of methyl orange (MO). The results showed that the as-prepared samples exhibited higher photocatalytic activities as compared to the pure TiO 2 , g-C 3 N 4 and TiO 2 /g-C 3 N 4 composite. The enhanced photocatalytic activities of TiO 2 /WS 2 /g-C 3 N 4 photocatalysts could be attributed to the synergistic effect of heterostructure between TiO 2 NPs and WS 2 /g-C 3 N 4 nano-sheets, which could efficiently improve the separation of photogenerated electron/hole pairs and utilization efficiency of photons. The quenching tests of radicals indicated that ·O − 2 had crucial effect on degradation of MO, which demonstrated that ·O − 2 was the main active radical in photocatalytic reaction process.
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MOLECULES
·
2017
·Vol. 22
·期 2
·337
·
IF 2.861
Fang Li,Wai Szeto,Haibao Huang,Jiantao Li,Dennis Y. C. Leung
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical.Keywords:TiO2nanowire arrays;photocatalytic rotating reactor;wastewater treatment
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 163
·期 3
·E33
·
IF 3.266
Liwen Hu,Yang Song,Jianbang Ge,Shuqiang Jiao,Jin Cheng
Molten CaCl2 has been considered as significant electrolyte for novel electrochemical metallurgy processes due to high solubility of oxygen anions. Some novel processes based on molten-salt electrolysis of oxides in molten chlorides have been proposed, typically including FFC process and OS process. An inert anode capable of sustained oxygen evolution is crucial for a green and efficient electrochemical de-oxidation process. Herein we report the results of a promising inert anode candidate, who shows an excellent performance. Several techniques including anodic polarization, cyclic voltammetry, Tafel polarization and electrochemical impedance have been performed to evaluate the anode behavior of the TiO2·RuO2 anode, revealing that the anode is quite stable during anodic polarization and has a more positive corrosion electrode potential. An in situ analysis of anode gases using the mass spectra proved the capability of the sustained evolution of oxygen at the TiO2·RuO2 anode during electrolysis, meaning that this oxides anode could be a potential candidate as inert anode in calcium chloride–calcium oxide melts for green metallurgical processes, as it showed a nearly negligible solubility of ruthenium dioxide when immersed in the melt and a low rate of corrosion even after long time electrolysis.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Wenchao Wang,Fang Li,Dieqing Zhang,Dennis Y.C. Leung,Guisheng Li
CdSe nanoparticles enhanced TiO 2 nanotube arrays electrodes (CdSe/TNTAs) were explored as the photoanode for driving the photoelectrocatalytic (PEC) generation of hydrogen and simultaneous degradation of organic pollutants in a PEC system. The evolution hydrogen and the simultaneous degradation of organic pollutants were performed in an electrolytic cell (three electrodes system) under visible-light ( λ > 400 nm). Such CdSe/TiO 2 based PEC system exhibited both high efficiency of hydrogen generation and effective oxidation of methyl orange (MO). Such high PEC performance of CdSe/TNTAs was attributed to the high dispersity of CdSe nanoparticles on both outside and inside of the pore walls of TiO 2 nanotube arrays, the strong combination and heterojunctions between CdSe and TiO 2 through Cd O bonds via electrodeposition with ion-exchange method.
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Advances in Natural Sciences-Nanoscience and Nanotechnology
·
2024
·Vol. 15
·期 1
·015008
·
IF 1.7
Tai Thien Huynh,Quyen Huynh,Ngoc-Han T Huynh,Hau Quoc Pham
In this work, we prepared an Ir,N-doped TiO2 nanomaterial via a facile HNO3-assisted hydrothermal process that was used as an advanced support for nano-sized Pt nanoparticles (NPs) for the formic acid oxidation reaction (FAOR). The physical and electrochemical behaviours of the as-made Pt/Ir,N-doped TiO2 catalyst were systemically investigated through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopes coupled with energy dispersive X-ray analysis (FE-SEM/EDX mapping), transmission electron microscopy (TEM), linear sweep voltammetry (LSV), Tafel slope, CO-stripping, and chronoamperometric (CA) test. The Pt NPs (ca. 3 nm) were anchored on the Ir,N-doped TiO2 support, being formed by a mixture of rutile and brookite with a particle size of several ten nanometers. Due to the small size and uniform distribution of Pt NPs, the Pt/Ir,N-doped TiO2 catalyst had an electrochemical surface area of 79.88 m2 g−1, which was greater than that of the commercial Pt/C (77.63 m2 g−1). In terms of the FAOR, the Pt/Ir,N-doped TiO2 catalyst showed a negative FAOR onset potential, high current density (11.85 mA cm−2), and superior CO-tolerance compared to the commercially available catalyst. Also, the as-made catalyst possessed high electrochemical durability after 3600 s for testing. The enhanced FAOR efficiency was assigned to the formation of a dual-doping effect and strong interplay between Pt and TiO2-based support, which not only improved the electron transfer but also weakened the adsorption of carbonaceous species, thereby boosting the reaction kinetics. This study could open up a facile but effective strategy to promote particular electrochemical applications.
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Chengzhuo Yu,Jin Xu,Li Xiong,Yarui Wang,Silong Wang,Fanglan Geng,Zesen Shang,Huasheng Wu,Lixia Zhao,Yawei Wang
Luminol-based chemiluminescence (CL) systems, as a powerful tool for bioanalysis, are limited owing to their weak CL intensity and self-decomposition of the classic oxidant H2O2. Herein, we introduced a new luminol CL enhancer, the natural light-driven photocatalyst MIL-100(Fe)/TiO2, for the selective determination of dopamine (DA). By employing MIL-100(Fe)/TiO2 for the first time as an efficient enhancer, the MIL-100(Fe)/TiO2-luminol CL intensity was 100 times higher than that of the classical H2O2-luminol system. The CL spectrum, UV–vis absorption spectroscopy, radical scavenger experiments, and electron spin resonance spectroscopy were utilized to investigate the possible CL mechanism of the MIL-100(Fe)/TiO2-luminol system. All of the results indicated that MIL-100(Fe)/TiO2 can generate reactive oxygen species under mild natural light, which could react rapidly with the luminol anion radical and result in direct CL emission. The sensitive plate for DA was developed based on its inhibiting effect on CL intensity, and the linear range between CL intensity and DA concentration was 100 nM–1000 μM with a detection limit of 16.7 μM (S/N = 3). This study successfully achieved a stable reactant that can directly trigger the CL of luminol without the need for additional oxidizing agents under mild natural light and offers new possibilities for photoinduced amplification technology.
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高影响因子
FUEL
·
2024
·
IF 6.7
Hong Wang,Zhongming Wang,Zizhong Zhang,Yaming Fan,Xianzhi Fu,Wenxin Dai
A prepared p-type PdO/n-type TiO 2 junction was prepared as the catalyst for photocatalytic hydrogen evolution from formic acid (FA). It was found that PdO/TiO 2 exhibited 1298-fold higher activity than TiO 2 under ultraviolet and visible light irradiation at room temperature. Multiple characterization techniques were utilized to demonstrate that doping PdO into TiO 2 can regulate the Fermi level of the sample and the adsorption behavior of FA, resulting in different electron transfer behavior between FA and PdO/TiO 2 compared to that between FA and TiO 2 . Oxygen vacancies acted as electron donors to deliver photogenerated electrons from TiO 2 to the adsorbed bidentate FA, which increased the electron density on the O atom of FA and led to the formation of activated monodentate FA. This activated FA was more easily oxidized by the holes in PdO generated by visible light, leading to the production of H 2 and CO 2 . The mode of adsorption associated with the Pd 2+ site is the key factor in driving this reaction and leading to the reversible electron transfer phenomenon. This study provides a new promising route for the design of photocatalysts for self-decomposition reactions.
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CHEMOSPHERE
·
2024
·
IF 8.1
Zhaonian Li,Daorong Li,Zhanzhao Feng,Shuqi Lv,Qingxuan Zhang,Yanru Yu,Ying Tian,Runfeng Huang,Hongxia Chen,Kunfeng Zhang,Hongxing Dai
WO 3 nanorods and x WO 3 @TiO 2 (WO 3 /TiO 2 mass ratio ( x ) = 1−5) photocatalysts were synthesized using the hydrothermal and sol-gel methods, respectively. The photocatalytic activities of x WO 3 @TiO 2 for NH 3 oxidation first increased and then decreased with a rise in TiO 2 content. Among them, the heterostructured 3WO 3 @TiO 2 photocatalyst showed the highest NH 3 conversion (58 %) under the simulated sunlight irradiation, which was about two times higher than those of WO 3 and TiO 2 . Furthermore, the smallest amounts of by-products (i.e., NO and NO 2 ) were produced over 3WO 3 @TiO 2 . The enhancement in photocatalytic performance (i.e., NH 3 conversion and N 2 selectivity) of 3WO 3 @TiO 2 was mainly attributed to the formed interfacial electric field between WO 3 and TiO 2 , which promoted efficient separation and transfer of photogenerated charge carriers. Based on the results of reactive species trapping and active radical detection, photocatalytic oxidation of NH 3 over 3WO 3 @TiO 2 was governed by the photogenerated holes and superoxide radicals . This work combines two strategies of morphological regulation and interfacial electric field construction to simultaneously improve light utilization and photogenerated charge separation efficiency, which promotes the development of full-spectrum photocatalysts for the removal of ammonia.
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RSC Advances
·
2024
·Vol. 14
·期 32
·23011-23022
·
IF 3.9
Ying Xu,Shuili Yu,Cong Huang,Zheng Xu
The photo-reduction of bromate (BrO3−) has attracted much attention due to the carcinogenesis and genotoxicity of BrO3− in drinking water. In this study, a heterojunction photocatalyst was developed by depositing Au nanoparticles (NPs) onto P25 TiO2 NPs through a one-pot, solvent-thermal process. Due to the unique properties of Au, the Au NPs deposited on the TiO2 surface created a Schottky barrier between the metal and the semiconductor, leading to an effective separation of photo-generated charge carriers as the Au nanoparticles served as electron sinks. The Au/TiO2 photocatalyst demonstrated efficient reduction of BrO3− under UV light illumination without the need for sacrificial agents. The effect of different Au loading of Au/TiO2 was systematically investigated for its influence on the generation of electrons and the reduction ability of BrO3−. The results indicate that the 1% Au/TiO2 catalyst exhibited a higher concentration of localized electrons, rendering it more effective in BrO3− removal. The photocatalytic efficiency for BrO3− reduction decreased upon the addition of K2S2O8 as an electron quencher, suggesting that the primary factor in this photo-reduction process was the availability of electrons. These findings hold promise for the potential application of the Au/TiO2 catalyst in the removal of BrO3− from drinking water through photo-reduction.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Chen,Longgang Liu,Xueyan Chen,Xiaoxiao Qin,Kunlin Li,Jianghao Zhang,Xiaolei Bao,Lingjuan Ma,Changbin Zhang
The influence of metal particle size over heterogeneous catalysts on the catalytic performance has always been an interesting subject due to its significance from both fundamental and practical perspectives. In this work, we regulated the synthesis of TiO 2 by the hydrolysis of different titanium precursors, and as-prepared TiO 2 supports were employed to load Ru with impregnation method. Interestingly, we synthesized three Ru-TiO 2 catalysts with different Ru particle sizes of 1.1, 2.9 and 5.2 nm. The Ru-TiO 2 catalysts were next tested for CO 2 hydrogenation reaction, the results show that the medium Ru particles on TiO 2 exhibited the best CO 2 methanation activity. Based on the characterizations, we observed that the medium Ru particles exhibited the best redox properties compared with small and large Ru particles, which was beneficial to the H 2 dissociation; in addition, the medium Ru particles exhibited a moderate ability to activate CO 2 , resulting in the most favorable formation and decomposition of bidentate bicarbonate. Consequently, the Ru-TiO 2 catalyst with medium Ru particles showed the highest activity for CO 2 methanation. This study provides a new method to prepare Ru-TiO 2 catalysts with different Ru sizes and also presents an understanding of Ru particle size effects on CO 2 hydrogenation.
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