FUEL
·
2025
·
IF 7.5
Jie Wang,Quanxing Zheng,Hongliang Lu,Jianqiang Fan,Xiaohua Deng,Wenjing Song,Pengfei Ma,Weikun Lai
Selective aqueous hydrogenolysis of cellulose to valuable ketones and alcohols is attractive for biomass utilization. This work developed a TiO 2 layer coated MoO 3 nanorod supported Ni catalyst for the hydrogenolysis of cellulose to ketones and alcohols, which achieved a maximum hexacarbon keto-alcohols yield of 71.2 % with a complete cellulose conversion at 220 °C and 3 MPa H 2 . The interaction of Ni and TiO 2 -MoO 3 oxides provided effective channels for hydrogen transfer, thereby boosting the reduction of MoO 3 to form MoO 2 species. More Lewis acid sites were created which facilitated the isomerization of glucose and retro -aldol condensation of fructose. The cleavage of C O bonds in hydroxyl-containing intermediates thus promoted their selective hydrogenolysis to form ketones and alcohols. Particularly, Ni TiO 2 /MoO 3 catalyst demonstrated excellent reusability due to the protective coating of TiO 2 layer and could be widely used in selective hydrogenolysis of various oxygen containing compounds.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaojing Yu,Haoran Qiu,Bin Wang,Qingnan Meng,Shaodong Sun,Yufei Tang,Kang Zhao
To construct Z-scheme not only can effectively separate the excited electron-hole pairs, but also utilize the ample redox capability of each semiconductor component in this system for the surface photocatalytic reaction. In this work, a TiO 2 –Au–BiOBr ternary Z-scheme photocatalyst was constructed, in which Au NPs were used as the electron mediator to join BiOBr nanosheets and TiO 2 nanofibers . The results showed that, under full spectrum irradiation, TiO 2 –Au–BiOBr nanofibers exhibited outstanding photocatalytic performance toward the degradation of Rhodamine B (RhB) with an excellent photodegradation efficiency of 99.91% within 30 min as well as good stability. The reaction mechanism of the TiO 2 –Au–BiOBr Z-scheme system was systemically studied by XPS , photoelectrochemical tests and free radical trapping experiments, etc. Moreover, the photocatalyst also exhibited excellent photocatalytic activity for degrading methyl orange and methylene blue.
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 HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Tao Ke,Shuyi Shen,Krishnamoorthy Rajavel,Kun Yang,Daohui Lin
Construction of heterojunction and nitrogen doping is an effective approach for synthesizing photocatalysts with high quantum yield and efficient electron-hole separation. 2D MXene Ti 3 C 2 has been considered a good carbonaceous nanomaterial for designing heterojunction, while the original surface groups and stacked structure limit the electron-hole separation. Herein, a hybrid of nitrogen-doped Ti 3 C 2 nanosheets and TiO 2 nanoparticles (NPs) composed of TiO 2 NPs in situ growing on isopropyl amine (iPA) modified Ti 3 C 2 (iN-Ti 3 C 2 ) was developed for the first time. The novel iN-Ti 3 C 2 /TiO 2 hybrid exhibited an excellent ultraviolet-light photodegradation of methylene blue (MB), with a degradation rate (0.02642 min −1 ) significantly higher than that of pure TiO 2 NPs, bulk-Ti 3 C 2 /TiO 2 , dimethyl sulfoxide modified Ti 3 C 2 /TiO 2 hybrid, and hydrazine monohydrate modified Ti 3 C 2 /TiO 2 hybrid. The formation of heterojunction between iN-Ti 3 C 2 and TiO 2 and its role in the photocatalysis were systematically analyzed using various characterization techniques and density functional theory calculation. The iPA modification exfoliated Ti 3 C 2 and doped N on Ti 3 C 2 nanosheets; the in situ grown TiO 2 NPs formed efficient heterojunctions with the nanosheets; the N-doping facilitated electron migration in Ti 3 C 2 and inhibited the recombination of photogenerated electron-hole pairs; •OH dominated the photodegradation of MB. This work provides a new approach of constructing efficient photocatalysts for the treatment of organics-polluted water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2016
·
IF 3.847
Wei Li,Rui-tang Guo,Shu-xian Wang,Wei-guo Pan,Qi-lin Chen,Ming-yuan Li,Peng Sun,Shu-ming Liu
Heavy metals (such as Zn and Pb) have a deactivation effect on the catalyst for selective catalytic reduction of NO with NH 3 . In this study, it was found that the modification of Mn/TiO 2 catalyst by Nb could greatly enhance its Zn resistance. From the characterization results of BET, XRD, H 2 -TPR, NH 3 -TPD, it may be concluded that the introduction of Nb into Mn/TiO 2 catalyst would lead to its lower crystallinity , more acid sites and higher concentrations of Mn 4 + and surface chemisorbed oxygen. The results of in situ DRIFT study reveal that the NH 3 -SCR reactions over Mn/TiO 2 and Mn-Nb/TiO 2 all obey both the Langmuir-Hinshelwood mechanism and the Eley–Rideal mechanism, and the doping of Nb on Mn/TiO 2 catalyst could promote the adsorption of NH 3 and NOx species on it. All these features make a contribution to the high SCR activity and good Zn resistance of Mn-Nb/TiO 2 catalyst.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Mengfan Wang,Wenbo Miao,Hongliang Xu,Chaoning Huang,Mingliang Li,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
g–C 3 N 4 nanosheets were first synthesized by calcining the mixture of hydrochloric acid-pretreated melamine and ammonium chloride. Then, by the aiding of solvothermal method and hydrofluoric acid as morphology modifier, 001-TiO 2 /g–C 3 N 4 (TCN-X, X = 5 , 3, 2, 1) nanocomposites were synthesized using g–C 3 N 4 nanosheets and tetrabutyl titanate, with the mass ratio of g–C 3 N 4 to TiO 2 was 5:1, 3:1, 2:1 and 1:1, respectively. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption method, ultraviolet–visible diffuse reflectance spectrum, photoluminescence spectrum, etc. Their photocatalytic properties were evaluated under visible light irradiation with rhodamine B (RhB) as the target pollutant. The results reveal that the TCN-3 composites had a large specific surface area of 67.38 m 2 /g and consisted of g–C 3 N 4 nanosheets and anatase TiO 2 crystals about 10–20 nm in size. The (001) crystal planes of TiO 2 can be easily observed in TCN-X composites. All TiO 2 /g–C 3 N 4 composites exhibited excellent photocatalytic activity compared with the pure g–C 3 N 4 did. The photocatalytic property of TCN-X samples varied with the mass ratio of g–C 3 N 4 to TiO 2 , and TCN-3 presented the optimum photocatalytic performance. In total, 50 mg of TCN-3 completely degraded 50 mL and 100 mL of RhB solution (10 mg/L) in 15 min and 40 min, respectively. The reaction rate constant of TCN-3 was 6.7 times as large as that of pure g–C 3 N 4 . TCN-3 also presented outstanding activity for the photocatalytic degradation of the colorless tetracycline solution. The significant improvement in photocatalytic activity of TCN-3 was attributed to the evenly distribution of TiO 2 on g–C 3 N 4 , the enhanced specific surface area and the construction of 001-TiO 2 /g–C 3 N 4 heterojunction between the g–C 3 N 4 nanosheets and the (001) crystal planes of anatase TiO 2 , which greatly reduced the recombination rate of the photo-generated electron and hole.
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 CATALYSIS
·
2022
·
IF 8.047
Chaoxin Zhang,Yanmei Huang,Bohang Zhao,Yu Yu,Yifu Yu,Bin Zhang
Photocatalytic nitric oxide (NO) synthesis from air is an attractive way to supersede the conventional nitrogen fixation manufacturing technique accompanied by high energy requirements and greenhouse gas emission. The development of efficient photocatalysts for direct solar-driven N 2 oxidation to NO without external thermal assistance is highly challenged. Here, CuO x clusters decorated TiO 2 nanoflowers with various copper contents are constructed and used for solar-driven air reaction into NO under ambient conditions. When the copper content is 1 wt%, the sample shows the optimal performance with a yield rate of 35.0 mmol m −2 h −1 (7.7 μmol h −1 ) and an apparent quantum efficiency of 1.77% at 365 nm. A series of in situ and ex situ characterizations reveal Cu 2 O species and TiO 2 support form direct Z-scheme heterojunction over 1%Cu-TiO 2 . This heterojunction can promote the adsorption and activation of nitrogen and oxygen reactants, leading to the performance enhancement of NO photosynthesis from air. Also, we proposed a possible NO photosynthesis reaction pathway over 1%Cu-TiO 2 .
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Xiaojuan Bai,Shengqi Yang,Chaohong Tan,Tianqi Jia,Linlong Guo,Wei Song,MeiPeng Jian,Xiaoran Zhang,Ziyang Zhang,Liyuan Wu,Hua Yang,Haiyan Li,Derek Hao
As the value of TiO 2 in environmental protection continues to be explored, it has broad potential for stone building protection. However, the hydrophilicity of TiO 2 makes it challenging to keep stable on the exterior of buildings and hydroxyl radicals generated under UV irradiation may be harmful to substrates. Herein, TiO 2 was wrapped with the SiO 2 shell by a modified Stöber method and superhydrophobic TiO 2 was obtained by grafting methyl groups on the SiO 2 shell. The TiO 2 @Si–Me core-shell system were dispersed in Paraloid B72 and applied on marble surfaces to investigate the self-cleaning effect of TiO 2 on the substrate. The results showed that the superhydrophobic TiO 2 nanoparticles significantly enhanced the surface roughness , which was beneficial to transform the acrylic resin coating from hydrophilic to hydrophobic and retain the original vapor permeability. The adsorption rate and degradation efficiency of methylene blue of TiO 2 @Si–Me core-shell system were 2.19 and 1.45 times higher than that of pure TiO 2 . Furthermore, the superhydrophobic TiO 2 did not change the color of the stone after UV aging, which contributed to maintaining the appearance of buildings. These findings will help to understand the role of photocatalytic nanomaterials in developing protective layers for stone construction and expand the application in the self-cleaning of the architectural environment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xiaoshuang Kang,Guohui Dong,Tingting Dong
In this study, TiO2 samples are synthesized through two stages including hydrolysis and calcination. It is found that the addition of HCl in the hydrolysis stage could facilitate the formation of heterophase junction TiO2. By annealing at 300 °C in an argon atmosphere, interfacial oxygen vacancies (Vo) and surface Vo (distributed in the anatase phase) can be constructed in the heterophase junction TiO2. After photocatalytic experiments, it can be found that surface Vo and interface Vo have a synergistic effect in the production of photocatalytic reactive oxygen species (ROSs). Surface Vo can enrich O2 and transmit electrons to O2 on the surface of anatase. Therefore, the enriched O2 can be converted into •O2– and 1O2 easily. The interfacial Vo not only facilitate the electron transmission between the two phases but also change the electron transfer mode from I-scheme to Z-scheme. Thus, interfacial Vo make photogenerated electrons transfer to anatase and photogenerated holes leave in the rutile. These holes in the rutile part have high oxidation potential and can better oxidize H2O (or OH–) molecules to •OH. They can also oxidize •O2– to 1O2. This work promotes the further development of defect design and application in photocatalytic materials.
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
CRYSTENGCOMM
·
2024
·
IF 2.6
Zikun Yang,Jingxuan Zheng,shi mengge,Zhao Wang
Single-atom catalysts (SACs) have attracted significant attention due to their unique electronic structure and extraordinary catalytic reaction activity. In this work, the single-atom catalysts Au1/TiO2 were successfully prepared using cold plasma. Notably, plasma-treated TiO2 introduces a substantial number of oxygen vacancies, which played a confinement effect on gold atoms. Au1/TiO2 achieved a remarkable 67% degradation of RhB in just 120 minutes, surpassing the performance of AuNPs/TiO2 by 2.8 times. The high catalytic activity can be attributed to several factors. Firstly, plasma-treated TiO2 contained a higher density of oxygen vacancies and exhibited a narrower band gap, which improved light absorption and facilitated the anchoring of monoatomic Au on the catalyst surface. Additionally, the single-atom Au species exhibited stronger interactions with TiO2, enhancing light absorption and charge transfer capability. Simultaneously, the presence of SACs on the catalyst surface increased the number of active sites, promoting efficient separation of electron-hole pairs and consequently enhancing the photocatalytic degradation activity. Cold plasma technology offers a simple and environmentally friendly platform for the fabrication of SACs, opening up exciting possibilities for catalytic applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanan Liu,Han Zhang,Dahai Zhu,Jinping Duan,Andere Clement Miruka,Li Tang,Pan Li,Li Cai
Photocatalysis and peroxydisulfate (PS) based advanced oxidation techniques are promising technologies in the field of water treatment that can be used to destroy increasingly persistent organic contaminants. The current work used a simple hydrothermal approach to synthesize a catalyst made of composites of TiO 2 nanospheres and multi-layer Ti 3 C 2 T x sheets (TiO 2 @MXene). Tetracycline (TC) was then effectively degraded by the TiO 2 @MXene material integrated with PS activation (300 mg/L). Under simulated sunlight (AM 1.5G, P = 2.8 W) irradiation, the combination method dramatically increases TC degradation. Following a 30-min treatment with 300 mg/L TiO 2 @MXene (wt.10 %), the optimal efficiency can reach 100 %. As the reactive functional species, holes (h + ), SO 4 - •, •OH, and •O 2 − dominate the catalytic process. Furthermore, investigation was conducted into significant factors such as catalyst dosage, PS dosage, common anions, and TiO 2 loading dosage. The TiO 2 @MXene material was demonstrated to be a feasible and sustainable strategy worth taking into consideration in the mitigation of emerging water contaminants due to its ease of recovery, stability of surface properties, and recyclability. Furthermore, the proposed degradation mechanism further demonstrated the viability of TiO 2 @MXene with PS in TC degradation. This, this study provides insights into the design of effective photocatalyst coupling PS activation for the efficient degradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 33
·13888-13897
·
IF 7.394
Jingling Yang,Qili Wu,Shiman He,Jing Yan,Jianying Shi,Jian Chen,Mingmei Wu,Xianfeng Yang
A TiO2 film has been facilely grown on a Ti foil via a general and simple acid vapor oxidation (AVO) strategy. Based on detailed characterization by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we found that the TiO2 film was composed of anatase nanoarrays highly oriented along their <001> direction, resulting in a large exposed {001} top surface on the film. The growth mechanism based on a topotactic transformation was proposed according to a careful study of time-dependent experimental results. Resulting from the evaluation of photocatalytic performance compared with a commercial TiO2 photocatalyst (Degussa P25), the as-prepared oriented anatase TiO2 film showed higher efficiency for degradation of atrazine and acid orange II (AOII). The performance of photocatalysis is highly relevant to the preferential orientation. The efficient photocatalysis could be attributed to the highly reactive {001} facets on the anatase nanoarrays with super-hydrophilicity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 38
·15682-15690
·
IF 5.7
Guotao Xiang,Yuanyuan Yi,Zhen Liu,Yanhong Li,Zhiyu Yang,Yongjie Wang,Sha Jiang,Xiao Tang,Xianju Zhou,Li Li,Xiaojun Wang,Jiahua Zhang
Developing efficient photocatalysts that respond to near-infrared (NIR) light holds significant scientific importance for improving the utilization of solar energy. In this study, the photocatalyst β-NaLuF4:Yb3+/Tm3+@TiO2 that simultaneously responds to both ultraviolet (UV) and NIR light is successfully synthesized. Instead of the conventional use of β-NaYF4:Yb3+/Tm3+, β-NaLuF4:Yb3+/Tm3+ upconversion (UC) nanoparticles (NPs) are employed as the NIR-UV light converter to achieve stronger UV UC luminescence. The data indicate that the photocatalytic degradation efficiency and rate of β-NaLuF4:Yb3+/Tm3+@TiO2 synthesized in this work are superior to those of NIR-driven photocatalysts based on β-NaYF4:Yb3+/Tm3+ under both NIR and sunlight irradiation. Further analysis of the UC emission spectra and the decay curves of the samples reveals an effective fluorescence resonance energy transfer (FRET) process between β-NaLuF4:Yb3+/Tm3+ and TiO2 after the combination, which makes the NIR-driven photocatalytic reactions happen. All results confirm that the present β-NaLuF4:Yb3+/Tm3+@TiO2 is an exceptionally efficient photocatalyst, owing to its responsiveness to both UV and NIR light.
研究领域:
材料科学
·
光化学
✓ 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）