JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2015
·
IF 1.909
Zaixing Jiang,Mingqiang Wang,Hao Cheng,Jun Li,Aslan Husnu,Haibao Lv,Yongtao Yao,Lu Shao,Yudong Huang,Mingdong Dong
Graphene is the most attractive carbon-based material at present and attracting increasing attention as promising candidates for applications in numerous areas, because of its extraordinary chemical, thermal and mechanical properties. In this paper, we discussed an innovative and simple method to synthesize titanium dioxide (TiO 2 ) nanoclusters , using graphene as a mid-step template not as a component of final product. Using this method, the graphene was firstly fully coated with TiO 2 nanoparticles by the thermal decomposition of titanium (IV) isopropoxide in a supercritical carbon dioxide (SC-CO 2 ) at 200 °C; the developed TiO 2 /graphene composites then were heated in an oxygen atmosphere. Eventually the TiO 2 nanoclusters were obtained. The prepared TiO 2 nanoclusters showed irregular features with high surface coverage, providing promises in a wide range of applications, especially for photo-degradation of organic compounds in aqueous solution under the radiation of UV-light.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yanhong Li,Qifeng Zhang,Yi Lu,Zhiting Song,Changjiang Wang,Dongshuo Li,Xiao Tang,Xianju Zhou
The photocatalytic degradation of tetracycline in aqueous solution is a typical heterogeneous reaction, and thus the design of efficient photocatalysts for tetracycline degradation should revolve the process features of heterogeneous reaction closely. In the present work, TiO 2 -P/ g -C 3 N 4 composites with abundant surface hydroxyls were prepared by coupled g -C 3 N 4 nanosheets with plasma treated TiO 2 (TiO 2 -P) nanoparticles . The resultant TiO 2 -P/ g -C 3 N 4 as photocatalysts showed higher activity for the degradation of tetracycline in aqueous solution than g -C 3 N 4 , TiO 2 , TiO 2 -P and TiO 2 / g -C 3 N 4 under visible light irradiation. The better activity of TiO 2 -P/ g -C 3 N 4 photocatalysts for tetracycline degradation could be ascribed to the good synergy between TiO 2 -P and g -C 3 N 4 . Specifically, due to the presence of surface hydroxyls on TiO 2 -P, the tetracycline adsorption activity, electrons-holes separation property as well as H 2 O 2 activating activity of TiO 2 -P/ g -C 3 N 4 during tetracycline degradation were improved. By integrating the property of g-C 3 N 4 photocatalyst in H 2 O 2 production, as well as the property of TiO 2 -P in activating H 2 O 2 into •OH and •O 2 - , efficient photo-Fenton degradation of tetracycline was achieved in the TiO 2 -P/ g -C 3 N 4 photocatalytic system. Our study on TiO 2 / g -C 3 N 4 composite photocatalyst provides helpful inspiration to design photocatalysts with high-activity for the photo-Fenton degradation of organic pollutants .
研究领域:
环境催化
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材料化学
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环境污染治理
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光化学
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纳米材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Qi Li,Pengcheng Wu,Yufan Huang,Peng Chen,Keliang Wu,Jianning Wu,Yan Luo,Lele Wang,Shengchao Yang,Zhiyong Liu,Xuhong Guo
Traditional surface-to-surface contact heterojunctions suffer from poor stability and low electron-hole separation efficiency, which has become a crucial limiting the further improvement of photocatalytic property. Therefore, improving the combination of heterogeneous materials will become a new attempt. In this work, a novel lattice embedded ZnO@TiO 2 (B) nanoflowers was prepared by combining electrodeposition method combined with hot solvent method. The hetero interface of the ZnO@TiO 2 (B) nanoflowers is distributed in the phase of TiO 2 (B), which drives high-efficiency charge separation. The sample Zn:Ti 1:4 has the highest photocatalytic property, and the H 2 generation efficiency under the full spectrum is 1.695 mmol g −1 h −1 , which is 3.5 times that of TiO 2 (B). After 36 h cycle stability test, its stability is as high as 90%. According to results, the possible mechanism of ZnO@TiO 2 (B) photocatalytic hydrogen production is proposed. These findings may provide new strategies for the preparation of high-efficiency heterojunction photocatalysts with special structures.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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环境功能材料
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 23
·22455-22463
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IF 2.8
Wang Pingping,Dong Faqin,Liu Mingxue,He Huichao,Huo Tingting,Zhou Lei,Zhang Wei
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-Fe 2 O 3 /TiO 2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-Fe 2 O 3 and TiO 2 electrodes, the composite α-Fe 2 O 3 /TiO 2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-Fe 2 O 3 /TiO 2 electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
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
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Rui Li,Wei Xiao,Chang Miao,Rui Fang,Zhiyan Wang,Mengqiao Zhang
A novel sphere-like SnO 2 /TiO 2 composite is synthesized via spray-drying followed by calcination as confirmed by X-ray diffraction and field emission-scanning electron microscopy analyses; the SnO 2 /TiO 2 composite is composed of the tetragonal cassiterite-like SnO 2 nanoparticles and anatase-like TiO 2 nanospheres . The characterization results show that the optimal stoichiometric ratio of SnO 2 /TiO 2 is approximately 3:1 when the composite serves as the anode for lithium ion batteries, in which the composite electrode not only delivers a high initial discharge specific capacity of 1476 mAh g −1 and retains 483 mAh g −1 after 40 cycles at 500 mA g −1 but also presents a low transfer resistance of approximately 56.33 Ω, a high Warburg coefficient of up to 85.82 Ω cm 2 s −0.5 , and a high lithium ion diffusion coefficient of approximately 6.934 E-15 cm 2 s −1 at ambient temperature. These excellent electrochemical properties suggest that the SnO 2 /TiO 2 composite electrode may be a promising anode material for lithium ion batteries .
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2019
·Vol. 26
·期 6
·1839-1850
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IF 1.947
He Lei,Zhang Yaqin,Zheng Yane,Jia Qingming,Shan Shaoyun,Dong Yanan
An effective catalyst of MIL-101(Fe)/TiO 2 composite was synthesized by solvothermal method. The resultant MIL-101(Fe)/TiO 2 was used for advanced oxidation degradation of tetracycline (TC) for the first time. The results indicated that the MIL-101(Fe)/TiO 2 showed higher TC degradation efficiency than pure MIL-101(Fe) or TiO 2 with the persulfate. Using 1 g L −1 MIL-101(Fe)/TiO 2 and persulfate at pH 7, 90.15% degradation rate was achieved under xenon lamp irradiation in 5 min for 20 mg L −1 TC. TiO 2 introduced in the composite played an important role in the degradation process, in which TiO 2 had a synergetic effect with Fe 3+ to generate Fe 2+ , Ti 3+ and radicals. Fe 2+ reacted with persulfate to produce Fe 3+ and a number of · OH to degrade TC. This reaction process was so fast that MIL-101(Fe)/TiO 2 with persulfate could degrade TC fairly rapidly. A novel TiO 2 -based metal–organic frameworks (MOFs) composite was more efficient for degrading pharmaceutical wastewater.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2015
·Vol. 17
·期 7
·5103-5108
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IF 4.493
Jian Zhi,Angran Chen,Houlei Cui,Yian Xie,Fuqiang Huang
Reducing light-induced e–h recombination is important for a dye sensitized solar cell (DSSC); the p-type NiO component in TiO2–NiO nanoparticles was reported to significantly decrease charge recombination, but its photovoltaic efficiency remains below 4% owing to a small surface area. In this work, we used a one-pot self-assembly process to fabricate flower-like mesoporous TiO2 decorated by NiO oxides, employing a pluronic polymer P123 as a structure directing and pore forming agent. The flower-like porous TiO2–NiO nanoparticles (F–TiO2–NiO NPs), possessing a high BET surface of 130 m2 g−1, are first used as a photoanode in DSSCs. These hybrid nanoparticles, decorated with NiO islands, are beneficial for improving photocurrent by increasing dye absorption and suppressing electron–hole recombination. The optimized F–TiO2–NiO NP anode (10 μm thick) achieved a power conversion efficiency of 8.20%, which is 26% and 47% higher than pristine flower-like TiO2 and commercially available P25 anodes, respectively. This efficiency is the highest among the reported TiO2–NiO hybrid anodes.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2016
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IF 4.509
Simin Peng,Bin Dang,Yao Zhou,Jun Hu,Jinliang He
The interfacial region between a nanoparticle and the polymer matrix is considered to have an important effect on the properties of nanocomposites. In this experimental study, the tuning effects of surface-modified TiO2 nanoparticles on the aggregation structure and trapping property of the nanocomposites are investigated. The addition of TiO2 nanoparticles increases the number of spherulites and decreases their sizes. It is also found that TiO2 nanoparticles can suppress the mobility of chain segments in the interfacial region, suppress crystallization, and reduce the crystallinity, depending on the surface modification and loading levels of nanoparticles. On the basis of the conclusions, the model of a spherulite and the interface is established and the trap distribution of the interface is analyzed according to the results of TSC measurements. It is assumed that there is a strong correlation between traps and the charge transport of nanocomposites, and the mechanism of charge transport is discussed with respect to the results of the volume conductivity measurement. It is believed that this study would provide an important hint to the research of the interface between nanoparticles and the polymer matrix in future research.
研究领域:
材料科学
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高分子物理
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xin Jiang,Han Jiang,Yimin Tang,Rui Wang,Wenxue Wang,Libin Yang,Bing Zhao
Semiconductor heterojunction with functional integration can be used as an excellent matrix for the ultrasensitive detection of bisphenol A (BPA) with low molecular affinity. Here, a simple, low-cost and sensitive surface-enhanced Raman scattering (SERS) strategy using g-C 3 N 4 /TiO 2 heterojunction as substrate was presented for detection of BPA residues in foods. The g-C 3 N 4 /TiO 2 achieved specific chemisorption for target analyte by the formation of intermolecular H-bond between g-C 3 N 4 and BPA. And, a high-efficiency carrier separation in TiO 2 induced by heterostructure could be achieved for charge transfer between the substrate and molecule by a “donor-bridge-acceptor” charge-transfer mode. Due to the synergistic/collaborative contributions of two monomers in heterojunction, the SERS enhancement factor was as high as 3.77 × 10 7 . The detection limit of BPA residues in foods (milk, juice and drinking water) was as low as 10 −9 mol·L −1 , far below the EU standard. The developed substrate also exhibited excellent stability and anti-interference capability.
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Fang-Di Wu,Jyh-Cherng Chen,Jia-Peng Hu
A ternary composite photocatalyst with high catalytic activity (TiO 2 /Ti 3 C 2 T x /AgI) was synthesized using the simple solvothermal and coprecipitation methods. The structure, morphology, photoelectric properties, and photocatalytic activity of the prepared materials were studied using various characterization techniques. The composite catalysts TiO 2 /Ti 3 C 2 T x /AgI with different proportions of TiO 2 /Ti 3 C 2 T x to AgI of 10%, 20%, 50%, 70%, and 90% were prepared by varying the amounts of AgNO 3 and KI. Compared to AgI and TiO 2 /Ti 3 C 2 T x , TiO 2 /Ti 3 C 2 T x /AgI demonstrated a superior photocatalytic degradation activity for tetracycline hydrochloride (TCH) under simulated sunlight. The degradation rate of TCH with 70% TiO 2 /Ti 3 C 2 T x /AgI composite photocatalyst reached 97%. The photoluminescence (PL) emission spectra showed that the recombination of photogenerated electrons of 70% TiO 2 /Ti 3 C 2 T x /AgI was effectively inhibited after the formation of AgI, TiO 2 , and Ti 3 C 2 T x heterojunctions . The electrochemical impedance spectroscopy (EIS) indicated that a rapid interfacial charge transfer of the 70% TiO 2 /Ti 3 C 2 T x /AgI composite to the electron acceptors (Ti 3 C 2 T x ). Ti 3 C 2 T x had high conductivity and can effectively accelerate the transfer and separation of photogenerated carriers as a charge medium. Therefore, the enhancement of photocatalytic activity of TiO 2 /Ti 3 C 2 T x /AgI can be attributed to the Z-scheme heterojunction with non-metal Ti 3 C 2 T x as the solid medium. In addition, the trapping agent experiment showed that superoxide radicals, singlet oxygen, and holes were the main active substances in the photocatalytic degradation of TCH by the TiO 2 /Ti 3 C 2 T x /AgI composite.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 3
·882-890
·
IF 2.372
Zhang Lu,Yu Deyou,Wu Minghua,Lin Junxiong
Abstract In order to improve the photocatalytic degradation performance of Ag 3 PO 4 and reduce the cost of photocatalyst made of Ag 3 PO 4 , a kind of Ag 3 PO 4 /TiO 2 composite was successfully fabricated via a simply precipitation method for the Ag 3 PO 4 nanoparticles being loaded on the surface of commercial titanium dioxide (P25) to form a heterostructure. The Ag 3 PO 4 /TiO 2 composite were characterized by FT-IR, XRD, XPS, FE-SEM, HR-TEM, DRS and PL and applied for the degradation of formaldehyde solution under solar radiation. The results showed that the degradation rat of Ag 3 PO 4 /TiO 2 composite (0.01796 min −1 ) was much higher than that of pure Ag 3 PO 4 (0.00775 min −1 ), indicating that the Ag 3 PO 4 /TiO 2 composite possessed better photocatalytic degradation activity for the formaldehyde solution than pure Ag 3 PO 4 . The composite significantly decreased the dosage of silver for photocatalyst under solar radiation, thereby reduced the cost of the photocatalyst made from silver. Graphical Abstract
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
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Dan Liu,Ismail Nadia,Chaohe Fang,Kuan He,Binghui Ge,Hailong Chen,Zhuo Chen
Hydrogenation of nitroaromatics to the corresponding amines plays a central role in the drug, fine chemical, and petrochemical industry. However, realizing hydrogenation through highly effective and environment-friendly methods remains a significant challenge. Here we demonstrated photo-enhanced catalytic activity for hydrogenation of nitrobenzene using Pt-Au/TiO 2 heterojunction as catalyst and hydrogen as reducing agent. The catalytic reaction rate improved 6.5 times under the simulated sunlight compared to the counterpart without light irradiation, and the TOF value of the catalytic reaction achieved as high as 7315 h −1 under light irradiation, better than the previously reported results. Further mechanism investigations indicate that light illumination can promote the activation of hydrogen and nitrobenzene molecules so that the catalytic performance improves significantly. This finding not only develops a green approach for the hydrogenation of nitroaromatics but also opens an avenue for designing high-efficiency photocatalysts.
研究领域:
化学工程
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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
危险品化学品经营许可证（带存储）