NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·265-271
·
IF 3.269
Xiao-Bo Xiang,Yang Yu,Wei Wen,Jin-Ming Wu
Noble metal loading and semiconductor compositing are two effective techniques to improve the photocatalytic activity of semiconductor photocatalysts. These two tactics are combined herein to achieve hierarchical Ag@TiO2@ZnO nanowires, which consist of ZnO nanorods growing radially from Ag nanowires with the help of a compact TiO2 intermediate layer. The Ag@TiO2@ZnO nanowires consisted of 4.3 wt% Ag, 16.7 wt% TiO2 and 79.0 wt% ZnO. When utilized to assist photodegradation of phenol in water under UV light illumination, the nanowires exhibited a reaction rate constant 1.8 times that of commercial Degussa P25 TiO2 nanoparticles and 3.8 times that of commercial ZnO nanoparticles. The excellent photocatalytic activity can be contributed to the enhanced light adsorption and charge separations arising from both Ag/TiO2 Schottky barriers and TiO2/ZnO heterojunctions.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Kaidi Li,Fangfang Zhang,Huiming Wang,Yalan Zhou,Lixin Zhao,Jimin Du,Yating Gao,Weimin Wang,Dae Joon Kang
Here, the lamellar-shaped Bi 2 S 3 grown on a porous TiO 2 monolith was obtained by a two-step method including a sol–gel route and hydrothermal treatment. The photocatalytic activity of the as-synthesized Bi 2 S 3 /TiO 2 composites was evaluated for photodegradation of methylene blue (MB) dye in aqueous solution under the visible-light irradiation. Based on our experimental results, 5% (molar ratio of Bi 2 S 3 to TiO 2 ) Bi 2 S 3 /TiO 2 photocatalysts exhibited a maximum photodegradation rate of MB up to 96.9% under visible-light irradiation for 120 min. Our findings indicated that the lamellar-shaped Bi 2 S 3 can extend the light absorption up to visible areas, and porous TiO 2 can provide enhanced specific surface area and more mass transfer pathway to enhance the photodegradation efficiency. Furthermore, porous TiO 2 can accept the electrons from the Bi 2 S 3 conduction band due to the relatively positive electrode potential to impede the photoproduced electron and hole combination to result in advanced photocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2019
·
IF 5.189
Shanshan Chai,Yong Men,Jinguo Wang,Shuang Liu,Qiaoling Song,Wei An,Gunther Kolb
Catalytic reduction of CO 2 to methane has been recognized as one of the most important strategic reactions to produce highly valuable chemicals and for storage of renewable energy (power-to-gas). This study demonstrates a crystal facet-dependent catalytic reduction of CO 2 to CH 4 on ruthenium nanoparticles deposited over TiO 2 nanocrystal with exposed (001) and (101) facets. Compared with TiO 2 (101) nanocrystal with the same Ru loading, Ru nanoparticles supported by TiO 2 (001) exhibited a highly enhanced CO 2 conversion rate and significantly improved methanation reactivity, along with a considerable durability. The physicochemical properties of the samples were characterized by HR-TEM, XRD, BET, FT-IR, UV–vis, Raman, ICP, and temperature-programmed reaction with CO 2 , and CO 2 + H 2 . In view of the difference in catalytic activity and the physicochemical properties of the supported Ru/TiO 2 catalysts, the results uncovered that the nature of the catalyst support of Ru/TiO 2 strongly affected the dispersion of Ru species and the synergistic effect between Ru and underlying TiO 2 supporting materials due to the strong metal-support interaction, and thus affected their capability to activate CO 2 and determined the catalytic activity for CO 2 methanation. Our work demonstrated the important role of the exposed crystal facets of the underlying support and the resulting Ru particle which had a large effect on CO 2 methanation.
研究领域:
催化化学
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2022
·Vol. 60
·期 11
·738-747
·
IF 0.913
Sun W.Z.,Huang Z.K.,Lu Y.J.,Liu L.M.,Xiao Z.
Preliminary experiments revealed solid-state reactions in the SiC–TiO 2 –MgO system that resulted in forming TiC compound, providing, thus, a new reaction system for the formation of TiC–SiC ceramic matrix composites. This system’s high-temperature physicochemical reaction and the phase equilibrium relations of TiC–SiC with salt compounds in the SiC–TiO 2 –MgO system will be examined in this paper. The obtained findings may significantly contribute to the composition of TiC–SiC ceramic composites. Solid-state reactions in the SiC–TiO 2 –MgO system were investigated during experimental procedures employing thermodynamic computing. Chemical kinetics of some reactions were highlighted and discussed, including mutual displacement reaction of SiC + TiO 2 = = TiC + SiO 2 to form TiC, the acid-based reaction of MgO with SiO 2 or TiO 2 to form Mg-silicates (Mg 2 SiO 4 , MgSiO 3 ) or Mg-titanates (Mg 2 TiO 4 , MgTiO 3 , MgTi 2 O 5 ), the reduction reaction of 2TiO 2 + C = Ti 2 O 3 + CO (g) with the involvement of excessive TiO 2 . The appearance of Ti 2 O 3 may also be due to significant surface defects of rutile TiO 2 (110) derived from its bulk Ti 3+ defects. However, Mg-silicates and Mg-titanates were not found in the design of the current SiC–TiO 2 –MgO system but the oxide design of the MgO–TiO 2 –SiO 2 system. As the SiC–TiO 2 –MgO ternary system was extended to the SiC–SiO 2 –TiC–TiO 2 –MgO quinary system, the phase relations form a combination of the TiC–SiC phase relations with all salts of the TiO 2 –MgO–SiO 2 system. Experiments confirmed the formation of TiC and its coexistence with SiC and all binary compounds of the TiO 2 –MgO–SiO 2 system, specifying an interaction in the SiC–SiO 2 –MgO–TiO 2 –TiC system. The phase relations of the quinary system were established, followed by constructing its phase diagram relations at 1400°C, which would be beneficial for the compositional design of TiC–SiC, TiC–ceramic, and SiC–ceramic composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Huihui Li,Xiaoyong Wu,Shu Yin,Kenichi Katsumata,Yuhua Wang
Novel g-C 3 N 4 /rutile-brookite TiO 2-x N y composite photocatalysts were fabricated through a facile solvothermal approach. The effect of rutile phase TiO 2 with brookite TiO 2 and g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /nitrogen-doped TiO 2 composite was studied. The photocatalytic performance of the photocatalyst was evaluated by measuring the degradation of NO gas under visible and UV light irradiation. It is suggested that g-C 3 N 4 /rutile-brookite TiO 2-x N y forms a Z-scheme photocatalytic system, which shows improvement on the photocatalytic activity than that of g-C 3 N 4 /single brookite TiO 2-x N y . By importing rutile phase TiO 2-x N y , the photogenerated electrons can efficiently transfer from rutile TiO 2 to g-C 3 N 4 , which results in the separation of electron and hole pairs, enhancing the photocatalytic ability. However, single brookite TiO 2-x N y can not remove the photogenerated electrons efficiently and the photocatalytic performances of composites decrease with g-C 3 N 4 amount increase.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 24
·7046-7058
·
IF 5
Wei Jin,Dekang Liu,Liyuan Zhang,Qian Sun,Yishan Wang,Enzhou Liu,Xiaoyun Hu,Hui Miao
Titanium dioxide (TiO2), a conventional n-type semiconductor, was widely used in photocatalysis, electrocatalysis and photoelectrocatalysis due to its good UV absorption and stable physical and chemical properties. However, its wide band gap and low oxygen reaction (OER) activity limited its application in photoelectrochemical (PEC) water splitting. In this work, we successfully constructed type-II Sb2(S,Se)3@TiO2 core–shell heterojunctions. Antimony sulfide selenide (Sb2(S,Se)3) was a quasi-one-dimensional light-absorbing material with an adjustable band gap (1.1–1.8 eV), which broadened the TiO2 light absorption range and effectively promoted the photogenerated carrier separation, transportation and utilization. Of particular note, novel Sb2(S,Se)3 nanospheres (NSPs) (ca. 69 nm) were in situ grown inside the tubes attributed to the unique space-confinement effect of TiO2 nanotubes (NTs). The IPCE value for Sb2(S,Se)3@TiO2 at 734 nm was 10.808% compared to 0.030% for TiO2. The separation efficiency and injection efficiency increased from 2.48% and 31.62% to 4.90% and 36.48%, respectively. The onset potential was moved negatively by 60 mV, and the maximum photocurrent density of 1.53 mA cm−2 at 1.23 V vs. RHE was 13.9 times higher than that of TiO2 (0.11 mA cm−2). This work provided a new idea for the application of TiO2 in the field of PEC water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1122
·
IF 5.719
Yong Li,Ming-Qing Zhang,Yan-Fang Liu,Ya-Xun Sun,Qing-Hua Zhao,Tian-Lu Chen,Yuan-Fu Chen,Shi-Feng Wang
Photocatalytic degradation is one of the most promising emerging technologies for environmental pollution control. However, the preparation of efficient, low-cost photocatalysts still faces many challenges. TiO2is a widely available and inexpensive photocatalyst material, but improving its catalytic degradation performance has posed a significant challenge due to its shortcomings, such as the easy recombination of its photogenerated electron–hole pairs and its difficulty in absorbing visible light. The construction of homogeneous heterojunctions is an effective means to enhance the photocatalytic performances of photocatalysts. In this study, a TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst (with B and A denoting bronze and anatase phases, respectively) was successfully constructed in situ. Although the construction of homogeneous heterojunctions did not improve the light absorption performance of the material, its photocatalytic degradation performance was substantially enhanced. This was due to the suppression of the recombination of photogenerated electron–hole pairs and the enhancement of the carrier mobility. The photocatalytic ability of the TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst was up to three times higher than that of raw TiO2(pure anatase TiO2).Keywords:homogeneous heterojunctions;photocatalyst;bronze TiO2;anatase TiO2;photocatalytic degradation
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Horizons
·
2020
·Vol. 5
·期 12
·1596-1602
·
IF 9.927
Kuo Lin,Fang Xiao,Ying Xie,Kai Pan,Lei Wang,Wei Zhou,Honggang Fu
Compared with the highly active anatase TiO2, rutile TiO2 usually presents poor photocatalytic performance due to high electron–hole recombination. Herein, we propose a surface domain heterojunction (SDH) structure between adjacent micro-domains with and without chemisorbed chlorine on rutile TiO2, which utilizes the potential difference between these domains to form a built-in field that promotes charge separation. Single-crystal rutile TiO2 nanorods assembled into radial microspheres with SDHs were fabricated, and these exhibited excellent solar-driven photocatalytic hydrogen evolution, ∼8-fold higher than that of the pristine one. Experimental results and density functional theory calculations reveal that the exceptional photocatalytic performance can be attributed to the in situ formation of chemisorbed chlorine, which forms SDHs that separate electrons and holes efficiently and results in surface reconfiguration, exposing the tri-active sites, increasing the O-site active centers and enhancing the catalytic activity of the 4-coordinated (Ti4c) and 5-coordinated Ti sites (Ti5c). This SDH strategy can extend to other halogen elements and thus provides an universal approach for the rational design of high-efficiency TiO2 photocatalysts toward sustainable solar-fuel evolution.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2016
·Vol. 9
·期 10
·1118-1124
·
IF 7.116
Xuefeng Liu,Zipeng Xing,Hang Zhang,Wenmei Wang,Yan Zhang,Zhenzi Li,Xiaoyan Wu,Xiujuan Yu,Wei Zhou
Graphical Pass the Mo : A 3 D sandwich of mesoporous black TiO 2 (MBT)/MoS 2 /MBT was fabricated using a facile mechanochemistry method combined with an in situ solid-state chemical reduction approach. The material exhibited excellent visible-light-driven photocatalytic performance for pollutant degradation and hydrogen evolution owing to the sandwich-like heterojunction structure and Ti 3+ doping. A novel 3 D mesoporous black TiO 2 (MBT)/MoS 2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS 2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS 2 and black TiO 2 . The significantly narrowed band gap of MBT/MoS 2 /MBT is attributed to the introduction of MoS 2 and the formed Ti 3+ species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h −1 g −1 , respectively. The introduction of MoS 2 and Ti 3+ in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.
研究领域:
材料科学
·
化学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2018
·Vol. 38
·期 6
·1239-1258
·
IF 2.658
Lu Na,Hui Yan,Shang Kefeng,Jiang Nan,Li Jie,Wu Yan
Plasma catalysis is gaining increasing interest in environmental and energy applications, such as the destruction of gas pollutants and hydrocarbon conversion. In order to further improve the application of plasma catalysis, it is crucial to understand the fundamental mechanisms, especially the mutual interaction between plasma and catalyst. In this paper, a parallel-plate dielectric barrier discharge (DBD) reactor is developed to investigate the plasma behavior and TiO 2 properties in the plasma/catalytic hybrid system. The introduction of TiO 2 thin film coated on the dielectric improves the discharge intensity, which significantly contributes to the enhancement of reactive species and charges. The energy efficiency of generating ozone in DBD/TiO 2 system has been approximately raised by 38% compared to pure DBD when the applied voltage reaches 13 kV. It is fortunately found that the discharge does not change the crystal structure of the TiO 2 , but the band gap increases from 3.13 to 3.39 eV, which has been proved to enhance the oxidizability of TiO 2 in the degradation of methyl orange experiment under UV light. The FTIR and XPS spectra also demonstrate that N element is doped into the structure of TiO 2 . These results successfully illustrate the plasma behavior and catalyst properties in plasma/catalysis hybrid system and provide reference for the optimization of the plasma catalysis process.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
L. Lv,S. Wang,Z. Zhang,L. Wang,P. He
Supported Ru catalysts over TiO 2 with various crystal phases were prepared, which involved rutile, anatase, and their mixed phase. And their catalytic activities for CH 3 Br complete oxidation were investigated. Results showed Ru/TiO 2-700-4 that TiO 2-700-4 is sourced from anatase TiO 2 calcined at 700 °C for 4 h is the most active catalyst among these catalysts. The content of rutile phase on the surface is lower than the bulk. Strong metal support interaction occurs owing to lower lattice mismatch between RuO 2 and rutile TiO 2 . It was further verified by H 2 -temperature programmed reduction, ultraviolet-Raman and transmission electron microscopy . Especially mixed-phase TiO 2 is more conductive to higher dispersion of RuO 2 than pure phase TiO 2 , which is easier to form epitaxial growth . The catalytic activity for CH 3 Br complete oxidation was not in exact accord with the dispersion of Ru. It is possibly attributed to the combination of arguably favorable physico-chemical properties of more Ru active sites, electron transfer , and appropriate surface acidity. At the low reaction temperature, more Ru active sites are beneficial for the total oxidation of CH 3 Br. With the increase of temperature, higher activity is prone to strong surface acidity and electron transfer, as was confirmed by X-ray photoelectron spectra and NH 3 -temperature programmed desorption analysis.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2018
·Vol. 644
·期 18
·1072-1077
·
IF 1.179
Kai Huang,Zhenyu Cai
This work presents the characterization and preparation of three-dimensionally ordered macroporous TiO 2 and TiO 2 /WO 3 composite nanoparticles with enhanced visible-light-responsive properties for rhodamine B (Rh B) photodegradation. The 3DOM TiO 2 and TiO 2 /WO 3 composites were prepared through a dip-infiltrating sol-gel process using a polystyrene (PS) colloidal crystal template. The materials were characterized by SEM, TEM, XRD, BET, XPS and UV/Vis. The 3DOM TiO 2 /WO 3 composite structures ranged from well-defined 3DOM structures, which are highly ordered and interconnected via small pore windows, to collapsed three-dimensional structures as the WO 3 content increased. The photoresponse range and specific surface area of the composite increased with less than 0.025 g of WCl 6 . The 3DOM TiO 2 /WO 3 composite with less than 0.025 g of WCl 6 exhibited a higher catalytic activity than 3DOM TiO 2 for the photocatalytic degradation of Rh B under simulated sunlight illumination.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）