COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengnan Nie,Chao Zhou,Weiwei Feng,Changhui Xin,Xin Yu,Qian Li
Self-doped Ti 3+ -TiO 2 and amorphous ZnS layers-coated Ti 3+ -TiO 2 nanostructures were successfully fabricated for via a calcination-ultrasonic synthesis strategy for organic pollutant degradation under visible-light illumination. The experimental results revealed that the synthesized Ti 3+ -TiO 2 clusters displayed efficient visible-light absorption and photocatalytic performance. It was also found that amorphous ZnS layers were formed on the coral-like Ti 3+ -TiO 2 clusters via an ultrasonic synthesis method, and the strongly combined interfaces greatly boosted the charge separation between ZnS layers and self-doped Ti 3+ -TiO 2 clusters. The synthesized Ti 3+ -TiO 2 @ZnS-15% heterojunction presented the highest photocatalytic activity with a rate constant of 0.03197 min −1 , approximately 9.87 times of commercial TiO 2 . In addition, the prepared Ti 3+ -TiO 2 @ZnS composites also exhibited highly boosted photocatalytic performance towards ciprofloxacin and tetracycline degradation under visible-light illumination compared with those of commercial TiO 2 , Ti 3+ -TiO 2 , and ZnS samples. Finally, the norfloxacin degradation pathways and visible-light photocatalytic mechanism over nanostructured Ti 3+ -TiO 2 @ZnS heterojunctions were suggested.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Longzhu Li,Tian Fang,Anqi Huang,Changhai Liu,Lulu Fu,Yuwei Chen,Yujie Ding,Naotoshi Mitsuzaki,Zhidong Chen
Since the photoelectrochemical properties of hematite are affected by its bulk and surface charge recombination, the introduction of a conductive substrate is a feasible way to improve its properties. In this paper, the Ti 3 C 2 and TiO 2 /Ti 3 C 2 conductive substrates were prepared by electrophoretic depositing multilayered Ti 3 C 2 and TiO 2 /Ti 3 C 2 nanosheet powders onto F-doped SnO 2 glass (FTO), respectively. Then, the TiO 2 /Ti 3 C 2 -hematite and Ti 3 C 2 -hematite photoanodes were obtained by in-situ growth of hematite on Ti 3 C 2 and TiO 2 /Ti 3 C 2 conductive substrates by hydrothermal method. The photoanodes were characterized by scanning electron microscopy (SEM), UV–vis spectroscopy, X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and photoelectrical measurements. The photocurrent density of TiO 2 /Ti 3 C 2 -hematite reaches 1.29 mA cm −2 at 1.23 V (vs. RHE), which is 3.7 times than that of the FTO-hematite as 0.35 mA cm −2 . The enhancement of the photocurrent response of TiO 2 /Ti 3 C 2 -hematite is mainly due to the great improvement of the bulk charge separation efficiency and the surface charge injection efficiency. This is attributed to the fact that the layered TiO 2 /Ti 3 C 2 conductive substrate can improve the interface property of FTO/hematite, provide Ti source and a larger specific surface area for the growth of hematite.
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
ChemistrySelect
·
2023
·Vol. 8
·期 37
·e202300997
·
IF 2.1
Yingying Li,Jiafei Wang,Xiang Wan,Qishu Qu
Graphical SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method, and then TiO 2 was coated on them to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. The use of TiO 2 /graphene composites as catalysts for photodegradation of dyes has been widely investigated. TiO 2 /graphene composites are usually obtained by coating TiO 2 on the surface of pre-prepared graphene. However, graphene is prone to curling and stacking, which makes it difficult to uniformly coat TiO 2 on its surface, resulting in poor photocatalytic performance. In this paper, a non-conventional approach to prepare TiO 2 /graphene nanocomposites based on the use of porous SiO 2 /graphene spheres as supports is presented. SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method. Then, TiO 2 was coated into the pores of SiO 2 /graphene spheres by sol-gel method to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. A mechanism of the RhB removal by the SGT composites was proposed.
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Hongyun Xue,Gansheng Shi,Guanhong Lu,Xinhong Xu,Xiaomeng Ren,Yan Wang,Xiao Wang,Xiaofeng Xie,Jing Sun
Constructing heterojunction structures is considered one of the effective methods to improve the activity of photocatalysts. A novel Z-Scheme heterojunction Fe-BDC/TiO 2 was designed and synthesized by amorphous gel Fe-BDC and TiO 2 nanoparticles with electrostatic self-assembly method. The introduction of Fe-BDC has been proved to expand the light absorption range and promote the separation and transfer of interface photo generated electrons and holes. Thus, the photocatalytic degradation efficiency of acetaldehyde by 5% Fe-BDC/TiO 2 sample is 2.3 times than that of pure TiO 2 sample. And the reaction rate is 2.5 times than that of pure TiO 2 sample. The free radical capture experiment shows that O 2 − played a more important role in the degradation of acetaldehyde. In addition, in situ infrared analysis further reveals the surface species of the photocatalysts during adsorption and degradation processes. The acetaldehyde degradation route of Fe-BDC/TiO 2 has been speculated. ‘1These findings provide valuable references for the design of metal oxide semiconductor/Fe based MOF heterojunctions and the efficient degradation of aldehyde VOCs.
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
MOLECULES
·
2023
·Vol. 29
·期 1
·144
·
IF 4.6
Tao Tian,Jie Zhang,Lijiang Tian,Sijie Ge,Zhenyu Zhai
Visible-light-enhanced TiO2nanocatalysts doped with Cu and Fe were synthesized using the sol–gel method to investigate their performance in degrading gaseous benzene. The structure and morphology of mono- and co-doped TiO2(i.e., Cu/Fe-TiO2, Cu-Fe-TiO2) were characterized using SEM, EDS, XRD, BET, Raman, UV-vis-DRS, and XPS techniques. The results indicated that the presence of Cu/Fe mono- and co-doped TiO2leads to the formation of an anatase phase similar to pure TiO2. Furthermore, the introduction of Cu/Fe enhanced the presence of lattice defects and increased the specific surface area of TiO2. This enhancement can be attributed to the increase in oxygen vacancies, especially in the case of Cu-Fe-TiO2. Additionally, Cu-Fe-TiO2showed a higher concentration of surface-bound hydroxyl groups/chemically adsorbed oxygen and a narrower bandgap than pure TiO2. Consequently, Cu-Fe-TiO2exhibited the highest photocatalytic performance of 658.33 μgC6H6/(g·h), achieving a benzene degradation rate of 88.87%, surpassing that of pure TiO2(5.09%), Cu-TiO2(66.92%), and Fe-TiO2(59.99%). Reusability tests demonstrated that Cu-Fe-TiO2maintained a high benzene degradation efficiency of 71.4%, even after five experimental cycles, highlighting its exceptional stability and reusability. In summary, the addition of Cu/Fe to TiO2enhances its ability to degrade gaseous benzene by prolonging the catalyst’s lifespan and expanding its photoresponse range to include visible light.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongying Li,Bicheng Zhu,Jian Sun,Haiming Gong,Jiaguo Yu,Liuyang Zhang
Compared to hydrogen production through pure water photocatalysis , the direct utilization of seawater for hydrogen production aligns better with the principles of sustainable development. Seawater, however, contains impurity ions like Na + and Cl − , which pose higher demands on photocatalysts . It is widely acknowledged that RuO 2 and TiO 2 demonstrate excellent stability in seawater . Consequently, this study focuses on the model system of RuO 2 -modified TiO 2 for investigating hydrogen production in simulated seawater. TiO 2 /RuO 2 nanofibers (NFs) were synthesized via a one-step electrospinning method, ensuring intimate contact between the two components. The hydrogen production activity of TiO 2 /RuO 2 NFs in simulated seawater nearly matches that in pure water. Remarkably, RuO 2 serves as an oxidation cocatalyst, effectively scavenging holes from the valence band of TiO 2 and enhancing the separation efficiency of electrons and holes. Interestingly, Cl − ions, similar to RuO 2 , contribute to reducing excess holes. This study lays the groundwork for future research into hydrogen production from seawater.
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
JOURNAL OF CLUSTER SCIENCE
·
2018
·Vol. 29
·期 6
·981-988
·
IF 1.715
Liu ZhangSheng,Li LinNa
Coal cinder-supported TiO 2 photocatalysts were synthesized via a novel coal combustion method. As-obtained samples were characterized by XRD, SEM, EDS mapping, Raman spectra, FTIR and DRS, and their photocatalytic performances were evaluated by degradation of methylene blue (MB) and methyl orange (MO) under UV–Vis light illumination. The results revealed that mixed-phases TiO 2 with adjustable anatase–rutile ratio could be obtained by adjusting the amount of precursor tetrabutyl titanate, which was uniformly covered on the coal cinder. These coal cinder-supported TiO 2 photocatalysts exhibited commendable photocatalytic activity. Among them, the indexed CCT-7.5 sample presented the maximum of activity, which can be attributed to the optimal phase composition of TiO 2 . The present work provided a novel synthetic route to fabricate immobilized photocatalysts, which might be extended to the preparation of other functional materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 11
·2870
·
IF 3.623
Jian Di,Haibo Yan,Zhuoyu Liu,Xing Ding
In this paper, we report a novel and simple method for synthesizing the microspheres self-assembled from ultrathin anatase TiO2nanosheets with a high percentage of (001) facets via the hydrolysis process of the single-reagent (potassium fluorotitanate). We then used optical microscopy, scanning electron microscopy, and high-resolution confocal laser Raman spectroscopy to characterize the microspheres generated under different conditions. The study found that the size of the anatase TiO2microspheres synthesized was 0.5–3 μm. As the synthesis time increased, the corroded surface of the microspheres gradually increased, resulting in the gradual disappearance of the edges and corners of the anatase nanosheets. The exposure percentage of the (001) facets of ultrathin anatase nanosheets synthesized for 2 h at 180–200 °C are close to 100%. The microsphere whose surface is completely covered by these anatase nanosheets also has nearly 100% exposed (001) facets. This new anatase nanosheet-based self-assembled microsphere will have great application potential in pollution prevention, environmental protection, and energy fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nano Select
·
2021
·Vol. 2
·期 9
·1770-1778
·
IF 0
Xiaoyan Wang,Axel Funke,Ya-Jun Cheng,Fang Song,Shanshan Yin,Suzhe Liang,Xiuxia Zuo,Jie Gao,Peter Müller-Buschbaum,Yonggao Xia
Continuous fast pyrolysis is developed for in situ synthesis of ultra-small metal oxide nanoparticles embedded into three-dimensional macroporous carbon matrix as demonstrated by the TiO 2 /carbon nanohybrid. The TiO 2 nanoparticles with the average size of 4.6 nm ± 0.6 nm are uniformly distributed in the in situ generated macroporous carbon matrix. When evaluated as an anode in a lithium-ion battery, the macroporous TiO 2 /C nanohybrid exhibits a reversible capacity of 483 mAh g –1 after 500 cycles at a current density of 67 mA g –1 , which is 3.6 times higher than that of the TiO 2 /C calcined in a conventional batchwise way. Besides, the capacity retains 93 mAh g –1 at a high current density of 670 mA g –1 . It reveals that the continuous fast pyrolysis is an efficient method to fabricate carbon composition based metal oxides as lithium-ion battery anode materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wentong Liu,Zunli Mo,Chao Shuai,Simin He,Ruimei Yue,Xudong Guo,Ying Chen,Hui Zheng,Jianchen Zhu,Ruibin Guo,Nijuan Liu
The TiO 2 /CeO 2 /PPS composite coating is prepared by air spraying method. The introduction of TiO 2 and CeO 2 into the PPS substrate significantly improves the corrosion resistance of the composite coating , and the electrochemical corrosion current density reduces two orders of magnitude. The coating is surface-modified with cetyltrimethoxysilane and has good hydrophobicity , so it has excellent anti-fouling and self-cleaning ability. It has the advantages of low processing cost and simple preparation method compared with other anti-corrosion coatings, since the coating is only prepared by a physical mixing method and does not involve complex chemical reactions, which possess the potential for practical application.
研究领域:
材料科学
·
防腐蚀工程
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 10
·1946
·
IF 3.352
Hong Shen,Zijun Tang,Xiang Xiao,Haiwen Wu,Hang Zhou,Ping Fang,Dingfang Zhu,Jianhua Ge
In this study, Mn-Ce/Al2O3/TiO2catalyst prepared by impregnation method was used for synergistic O3oxidation NO. The catalyst prepared by impregnating Al2O3/TiO2at a Mn:Ce molar ratio of 4:1 showed the best catalytic activity. The catalyst performance showed that when the molar ratio of Mn:Ce was 4:1 and the volume ratio of O3:NO was 1:4, the removal rate of NO could reach 63%, which could increase the removal rate by 40% compared with that of NO oxidized by O3alone. BET, XRD, and TEM characterization results showed that when the molar ratio of Mn:Ce was 4:1, the catalyst specific surface area, and pore capacity were the largest. A large amount of MnOx and CeOx were distributed on the catalyst surface. The XPS analysis showed that the oxidation-reduction and oxygen vacancy of Mn (IV)/Mn (III)/Mn (II) and Ce (IV)/Ce (III), had a synergistic effect on the decomposition of O3into reactive oxygen species(O*), thus improving the catalytic capacity of Mn-Ce/Al2O3/TiO2catalyst for O3. The O2-TPD analysis showed that the oxygen vacancies and oxygen species in the catalyst could be used as the active point of decomposition of O3into O*. The experimental results show that the prepared catalyst can significantly improve the efficiency of ozone oxidation of NO and reduce the amount of ozone. The catalyst can be applied to ozone oxidation denitrification technology.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
NANO
·
2016
·
IF 0.951
Jimin Du,Huiming Wang,Huijuan Chen,Menghe Yang,Xiaoling Lu,Hui Guo,Zhanmin Zhang,Tianwei Shang,Shujue Xu,Wenqi Li,Pianpian Wang,Imran Shakir
Black Porous Zr-doped TiO 2 monoliths were successfully synthesized by a combined route including sol–gel method with polystyrene spheres as template followed by calcination at high temperature in the presence of oxygen. As-synthesized samples were then treated in hydrogen atmosphere at 500 ∘ C for 6 h to obtain black Porous Zr-doped TiO 2 monoliths. This as-synthesized black porous Zr-doped TiO 2 composite showed relatively narrow bandgap compared to the pure anatase phase of TiO 2 , which may have its origin from the contributions from the Zr impurity and oxygen vacancies. The photocatalytic activity of the black porous Zr-doped TiO 2 monolith was examined by carrying out the dye degradation on Rhodamine B under visible irradiation. Our experimental results indicate that black porous 0.9% Zr-doped TiO 2 sample exhibits high photocatalytic activity with the photodecomposition of 95.25% under visible irradiation for 120 min.
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）