JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 7
·6954-6962
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IF 2.195
Jiang Nan,Du Yi,Du Minxing,Feng Yibing,Liu Yang
TiO 2 nanobelts with different synthesis methods have been actively pursued for a long time, however, a systematic study corresponding to the fabrication of TiO 2 nanobelts by alkali-hydrothermal method has not been worked out by any research. Here, we systematically study the conditions such as the source of Ti and hydrothermal parameters with the assistance of X-ray diffraction (XRD), scanning electron microscope (SEM), N 2 -sorption measurement and photochemical tests. The XRD and SEM measurements show that the TiO 2 nanobelts exhibit excellent belt-like structures and high crystalline intensity when using tetrabutyl titanate (Ti(OBu) 4 ) as the source of Ti, the volume of 10 mol/L NaOH is 15 mL, the hydrothermal reaction is conducted at 180 °C for 20 h and the heat treatment system is 800 °C for 2 h. The length–diameter ratio of the final obtained sample is about 130 and the specific surface area is 50.4 m 2 /g.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Xiao Chen,Zhenglong Zhao,Ying Zhou,Qiulian Zhu,Zhiyan Pan,Hanfeng Lu
This study presents an efficient, economic, and simple preparation strategy for Pt/TiO 2 monolith catalysts. Nano-Pt/TiO 2 dispersion liquid with good activity and stability was synthesized by hydrolysis and chemical reduction method. Various Pt/TiO 2 monolithic catalysts were prepared by spraying the dispersion liquid on different substrates. Results of transmission electron microscopy, scanning electron microscopy, N 2 adsorption-desorption, H 2 temperature-programmed and CO oxidation showed that the Pt/TiO 2 nanoparticles with good mesoporous structure and redox properties were highly dispersed on the substrate. The as-prepared 0.5 Pt/TiO 2 cordierite monolithic catalyst with 0.1 wt‰ Pt content exhibited excellent catalytic combustion activity ( T 90 of toluene combustion was 212 ℃), stability (no deactivation was observed during a 120 h test) and firmness (mass loss was 0.11% after 1 h ultrasonic vibration) under experimental conditions. Compared with state-of-the-art methods, this method is more suitable for large-scale production of waste-gas-treated monolith catalysts. And this method meets the concept of energy saving and emission reduction because of its simplicity, high efficiency, environmental friendliness, and high utilization of active components.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2022
·Vol. 24
·期 12
·1-14
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IF 2.533
Ma C. Y.,Wang R. T.,Zhao G. H.,Zhang Q. Y.
The construction of matchable multi-heterojunction with appropriate morphology provides a good strategy for improving the performance of semiconductor photocatalyst in degrading organic pollutants. Herein, binary WO 3 /Bi 2 WO 6 nanosheets coupled with various contents of mesoporous anatase TiO 2 nanoparticles for constructing TiO 2 /WO 3 /Bi 2 WO 6 heterojunction composite photocatalysts are hydrothermally fabricated. The investigation on structure and properties in the TiO 2 /WO 3 /Bi 2 WO 6 ternary photocatalysts in terms of the incorporation of TiO 2 is systematically conducted by using characterization techniques. The results show that the TiO 2 /WO 3 /Bi 2 WO 6 ternary composite at the optimized Ti/W ratio of 1:2 has the highest visible light-irradiated MB degradation, which is 9.5 times and 2.8 times that of pure TiO 2 and pristine WO 3 /Bi 2 WO 6 nanosheets, respectively. The effective charge separation between TiO 2 and WO 3 /Bi 2 WO 6 has been confirmed by PL and current–voltage (I-V) characteristics. A possible mechanism is clarified through the active species trapping experiments using various scavengers, indicating that photogenerated holes and • OH radicals play a key role. The enhanced photocatalytic activity can be ascribed to the synergistic effect of the unique structure with some favorable properties, including the elevation of the separation efficiency of photoinduced electron–hole pairs at the multi-heterojunction interfaces with appropriate band structures as well as more active adsorption sites of mesoporous/nanosheet microstructure in the degradation process. This research may provide a simple method for design and preparation of novel heterojunction photocatalysts for enhanced visible light-driven photocatalytic activity. Graphical Abstract
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
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IF 3.512
Jiang Wu,Xian Li,Jianxing Ren,Xuemei Qi,Ping He,Bu Ni,Chong Zhang,Chengzhen Hu,Jun Zhou
TiO 2 hollow sphere was synthesized by hydrothermal method using trifluoroacetic acid (TFA) and Ti(SO 4 ) 2 as raw materials, and it was applied to photocatalytic oxidization of elemental mercury (Hg 0 ) in the simulated flue gas. The prepared samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (UV-vis DRS) and nitrogen adsorption/desorption. The results showed that only anatase phase TiO 2 hollow sphere was obtained. The average diameter of TiO 2 hollow spheres was about 800 nm and the shell thickness was about 200–400 nm. When M , the molar ratio of TFA to Ti(SO 4 ) 2 , was higher than a certain value, the photocatalytic activity of prepared TiO 2 hollow spheres began to reduce. When M = 2, addition TFA content was the best quantity, which got the best TiO 2 hollow spheres and provided the most appropriate F − decomposed from TFA during the sample preparation, which was helpful to its photocatalytic ability. In the experimental temperature range, the photocatalytic oxidation efficiency decreased with the increasing of reaction temperature, and the intensity of UV irradiation had an important effect on the photocatalytic reaction. When UV irradiation intensity was 303.45 μW cm −2 and reaction temperature was 55 °C, TiO 2 hollow sphere sample prepared at M = 2 had the highest photocatalytic ability and the mercury removal efficiency reached up to 82.75%.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2014
·
IF 3.679
Jian Yu,Wan-Feng Lin,Le-Hui Leng,Shao-Kui Bao,Jian-Ping Zou,Xu-Biao Luo,De-Zhi Chen,Sheng-Lian Luo,Chak-Tong Au
Novel heterostructured TiO 2 /Co 4 S 4.23 Se 3.77 composites were synthesized by a combination of solid-state and sol–gel methods, and were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photocurrent measurements. The results of photocatalytic degradation of methylene blue over the as-prepared materials indicate that photocatalytic efficiency is closely related to the composition of the materials, and the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst exhibits the best adsorption and photodegradation efficiency under sunlight or visible-light irradiation. The adsorption capacity of 30%TiO 2 /Co 4 S 4.23 Se 3.77 for methylene blue is 18.59 mg/g calculated based on the Langmuir adsorption model. Adsorption kinetics studies show that the process fits well with a pseudo-second-order rate mechanism. Recycle experiments confirm that the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst is stable. The present work illustrates a new way for the design and syntheses of stable and high-efficiency catalysts applicable for the degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Advances in Materials Science and Engineering
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2014
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IF 0.897
M. S. H. Al-Furjan,Kui Cheng,Wenjian Weng
Electrochemical biosensors are essential for health monitors to help in diagnosis and detection of diseases. Enzyme adsorptions on biosensor electrodes and direct electron transfer between them have been recognized as key factors to affect biosensor performance. TiO2 has a good protein adsorption ability and facilitates having more enzyme adsorption and better electron transfer. In this work, Mg ions are introduced into TiO2 nanodots in order to further improve electrode performance because Mg ions are considered to have good affinity with proteins or enzymes. Mg doped TiO2 nanodots on Ti substrates were prepared by spin-coating and calcining. The effects of Mg doping on the nanodots morphology and performance of the electrodes were investigated. The density and size of TiO2 nanodots were obviously changed with Mg doping. The sensitivity of 2% Mg doped TiO2 nanodots based biosensor electrode increased to 1377.64 from 897.8 µA mM−1 cm−2 and its decreases to 0.83 from 1.27 mM, implying that the enzyme achieves higher catalytic efficiency due to better affinity of the enzyme with the Mg doped TiO2. The present work could provide an alternative to improve biosensor performances.
研究领域:
生物医学工程
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材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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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.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2015
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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.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Lei Li,Jian Yang,Lei Yang,Fan Fu,Hao Xu,Ximei Fan
As one of the typical volatile organic compounds, toluene is harmful to human health and challenging to decompose effectively with traditional photocatalysts, such as TiO 2 or ZnO. Here, a trace Fe 3+ doped TiO 2 /Bi 2 WO 6 composite photocatalyst with abundant oxygen vacancies was successfully synthesized via a hydrothermal method and subsequently impregnation treatment. The Fe 3+ doped TiO 2 /Bi 2 WO 6 were optimized by adjusting the molar ration of TiO 2 and Bi 2 WO 6 , and the optimal molar ratio was found to be TiO 2 :Bi 2 WO 6 = 1:2. The obtained Fe (0.1) -TB 2 with only 0.1 wt% Fe 3+ dopant exhibited superior photocatalytic activity with over 90% toluene removal efficiency after 180 min under visible light irradiation. A series of characterizations reveal that the improved photocatalytic activity of Fe 3+ doped TiO 2 /Bi 2 WO 6 can be attributed to synergistic effects between the extension of photogenerated carrier lifetime and the increase of visible light absorption range by narrowing the energy bandgap (shortened about 0.32 eV) and the formation of oxygen vacancies. Furthermore, hydroxyl radicals and holes as the key reactive oxygen species (ROS) in the photodegradation reaction were confirmed by electron spin resonance (ESR) experiments. Therefore, introducing Fe-ions into TiO 2 /Bi 2 WO 6 photocatalysts is an effective way to enhance the photocatalytic activities, and the modified catalysts can be considered as a promising material for decomposing toluene and other VOCs.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2021
·
IF 4.641
Qiao Lu,Changchang Dong,Feng Wei,Jiadong Li,Zhao Wang,Wei Mu,Xiaojun Han
Photocatalysis shows great potential in pollution degradation without environmental harm. Herein, TiO 2 nanotube arrays (TNTAs) were prepared on titanium mesh by an anodic oxidation method, and Bi 2 WO 6 /TiO 2 nanocomposites (BWO/TNTAs) with different Bi 2 WO 6 contents were synthesized by a hydrothermal method. The Bi 2 WO 6 nanosheets decorated on TNTAs significantly improved the photocatalytic degradation of tetracycline (TC). 0.2BWO/TNTAs exhibited the degrading rate of 92.2% within 180 min under visible light. The enhancement of photocatalytic performance was ascribed to the II-type mechanism via Bi 2 WO 6 coupled with TiO 2 , which further extended the visible light absorption range and promoted the charge separation. In addition, •OH is the main active species to dominate the degradation of TC. The possible decomposition mechanism of TC was proposed by gradual loss of hydroxyl groups and C-ring cleavage. It provides a feasible strategy to remove organic pollutants for wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 2
·447-466
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IF 3.4
Xia Guangda,Yang Tianyu,Liu Yu,Zhu Xiaodong,Zhou Hui,Wu Ruiying
Biomorphic TiO 2 with hierarchical porous structures for photocatalytic degradation is fabricated by templating wood residues of different size scales (lignocellulose, wood flour, and solid wood as biological templates) using a simple sol–gel method. Compared to template-free TiO 2 , the biomorphic TiO 2 had a better adsorption capacity and photocatalytic performance when decomposing methylene blue (MB) and phenol. The lignocellulose-templated TiO 2 reached adsorption equilibrium within 60 min because of a composite hierarchical structure with the complex interlaced wood, and demonstrated 98.9 and 84.3% degradation of MB and phenol within 60 min under visible light conditions. The multiscale structures of these wood templates enhanced light absorption and mass transfer efficiency due to the presence of additional surface hydroxyl groups and a reduced bandgap. This research proposes a convenient synthesis method to obtain biomorphic TiO 2 using wood residues and modifies the physio-chemical interaction between wood and TiO 2 to enhance the visible light response and transfer of photogenerated charge carriers in the system.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jianhui Xu,Xin Fu,Yufeng Liu,Yunfei Zhang,Shenggui Chen,Dan Li,Chunhui Zhang,Jiale Gao,Yibo Fu
Electrocatalytic hydrodechlorination technology provides an attractive strategy to effectively eliminate the biotoxicity of halogenated organic pollutants (HOPs). Herein, we demonstrated a highly dispersed Pd loaded on blue TiO 2 nanotube arrays (Pd x -BTNA) cathode that can achieve efficient dechlorination and detoxification toward florfenicol (FLO). Characterization results indicated that strong interaction between Pd and BTNA was achieved through Pd-O bonds, which facilitated the electron transfer rate. Pd x -BTNA significantly outperformed other cathodes (i.e., BTNA, Pd x -TNA and Pd x -Ti) in the electrocatalytic dechlorination of FLO due to enhanced utilization of active H*. The dechlorination performances of FLO well followed the pseudo-first-order kinetic, and the reaction constant rate on Pd x -BTNA cathode (0.035 min −1 ) was 17.5, 1.94, 7.0 times higher than that on BTNA, Pd x -TNA and Pd x -Ti cathodes, respectively. Quenching experiments and electrochemical characterization indicated that both direct electron transfer and indirect reduction process mediated by H* were involved in the dechlorination of FLO. The optimal dechlorination efficiency of 98.79% was obtained by Pd x -BTNA cathode within 120 min at 1 mM PdCl 2 , applied cathode potential of −1.2 V. In addition, Pd x -BTNA exhibited superior stability and durability with almost no Pd leaching (0.0011 mg/L) during five dechlorination cycles. Our research proposed a novel strategy to design low noble Pd-loaded cathode material for efficient dechlorination and detoxification of HOPs.
研究领域:
环境科学
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材料科学
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电化学
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DOI
高影响因子
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