RSC Advances
·
2024
·Vol. 14
·期 26
·18432-18443
·
IF 3.9
Jiao Wang,Hemu Pi,Panchao Zhao,Na Zhou
The presence of methyl orange (MO) and ciprofloxacin (CIP) in wastewater poses a serious threat to the environment and human health. Titanium dioxide nanoparticles (TiO2 NPs) are widely studied as photocatalysts for wastewater treatment. However, TiO2 NPs have the drawbacks of high energy required for activation, fast electron–hole pair recombination and difficulty in recovering from water. To overcome these problems, europium decorated titanium dioxide/poly(vinylidene fluoride) (Eu–TiO2/PVDF) membranes were successful prepared in this work by combining the modified sol–gel method and the immersion phase inversion method. The Eu–TiO2/PVDF membranes obtained with the increase of Eu–TiO2 NPs content during the preparation process were named M1, M2 and M3, respectively. The pure PVDF membrane without the addition of Eu–TiO2 NPs was named M0, which was prepared by the immersion phase inversion method and served as a reference. The prepared Eu–TiO2/PVDF membranes could not only adsorb MO, but also degrade CIP under visible-light irradiation. Moreover, the Eu–TiO2/PVDF membranes exhibited adsorption–photocatalytic activity towards a mixture of MO and CIP under visible-light irradiation. Last but not the least, the Eu–TiO2/PVDF membranes exhibited excellent recyclability and reusability, opening the avenue for a possible use of these membranes in sewage-treatment plants.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Muhammad Jamshaid,Adeel Ahmed,Rashid Iqbal,Ali Fareed,Wedad A. Al-onazi,Mohamed S. Elshikh
The current study focuses on the development of highly efficient nickel oxide/titanium dioxide (NiO/TiO 2 ) p-n heterojunction catalysts constructed via sol–gel and ultrasonic techniques. Different techniques, including XRD, SEM, EDS mapping, and XPS, confirmed the successful synthesis of the photocatalysts. The BET analysis showed that the NiO/TiO 2 heterojunction has a surface area of 107.52 m 2 /g compared to pure NiO and TiO 2 (75.37 m 2 /g and 89.13 m 2 /g) respectively. The catalyst was then implemented to decompose the antibiotic tetracycline (TC) in water under visible light. The outcomes revealed that the degradation rate of TC reached 97.69 % using NiO/TiO 2 , which is substantially greater than the degradation achieved with pure NiO (52.43 %) and TiO 2 (71.11 %) within a 48-minute period pursuant to the most favorable circumstances. The initial rate constant of the NiO/TiO 2 (0.0756 min −1 ) was significantly higher compared to that of the NiO (0.0153 min −1 ) and TiO 2 (0.0261 min −1 ). The lower bandgap energy of the NiO/TiO 2 (3.19 eV) catalyst compared to the pure NiO (3.58 eV) and TiO 2 (3.29 eV) facilitated the abatement of TC due to the improved harvesting of visible light absorption. Furthermore, the study investigated the impact of several different reaction parameters and intervening anions on TC degradation. Radical trapping investigations substantiate the existence of reactive oxygen species. In addition, NiO/TiO 2 catalyst exhibited extraordinary stability and maintained its catalytic efficiency despite enduring five successive cycles. Overall, the NiO/TiO 2 catalyst demonstrated remarkable potential for abolishing TC-contaminated water.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xin Kang,Jiancong Liu,Dongxu Wang,Chungui Tian,Honggang Fu
CO 2 hydrogenation to hydrocarbons under high space velocity is crucial for industrial applications, but traditional Fe-based catalysts often suffer from the low activity and poor stability. Herein, we report a new tandem catalyst system combining Pt/TiO 2 catalysts with Fe 3 C catalysts for the direct conversion of CO 2 into C 2 -C 4 hydrocarbons under high space velocity. The Pt/TiO 2 component promotes *CO intermediate production with an enhanced Reverse Water-Gas Shift (RWGS) reaction efficiency, providing a highly reactive species for the Fe 3 C catalyst to achieve Fischer-Tropsch synthesis (FTS). By maximizing the contact interface between the Pt/TiO 2 and Fe-based components through a granule mixing configuration, we achieve significant enhancements in both CO 2 conversion rate (24.0 %) and C 2 -C 4 hydrocarbons selectivity (51.1 %) under the gaseous hourly space velocity (GHSV) of 100000 mL g cat −1 h −1 . Besides, excellent stability is achieved by the tandem catalysts with continuous catalysis for up to 80 h without significant decrease in activity. Through modulation of the reduction states of iron oxide, we effectively tune the composition of Fe-based catalyst, thereby tailoring the product distribution. Through this work, we not only offer a promising avenue for reducing CO 2 for efficient CO 2 utilization but also highlight the importance of catalyst design in advancing sustainable chemical synthesis.
研究领域:
催化化学
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环境科学
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能源化学
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 17
·2100889
·
IF 6.147
Yeguang Zhang,Yong Qi,Shufen Zhang
Due to its high refractive index, photocatalytic activity, and photoinduced superhydrophilicity, TiO 2 has advantages in photonic crystals (PCs). However, the composite of TiO 2 and PCs needs to be calcined at high temperatures, and the structural stability of the composites is poor. In this study, photoinduced superhydrophilic TiO 2 –poly(hydroxyethyl acrylate)/polystyrene (PHEA/PS) PC composites with strong structural colors and self-cleaning are fabricated by coating triethanolamine-modified anatase TiO 2 nanoparticles-hydroxyethyl acrylate on the surface of PS PCs. The ordered arrays can be retained after the superficial layers of PS PCs are filled with TiO 2 –PHEA, and vivid blue, green, and red composites can be obtained. The water contact angles of the composites can be reduced to 3° in 0.4 s, and superhydrophilicity can be maintained for 180 days in a laboratory environment. The declining superhydrophilicity can be restored under UV irradiation. The composites can degrade the adsorbed methylene blue under UV irradiation. Photocatalytic activity and superhydrophilicity impart self-cleaning ability on the composites. The locking of PS arrays by TiO 2 –PHEA enhances the structural stability of the composites, making them resistant to water soaking and washing. Therefore, the composites show prospects for decoration, fabric coloring, and wearable electronic devices.
研究领域:
材料科学
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纳米技术
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光学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 10
·1701574
·
IF 4.834
Peng Guan,Hongye Bai,Chunfa Li,Yilin Ge,Dongbo Xu,Biyi Chen,Teng Xia,Weiqiang Fan,Weidong Shi
Overcoming one of most challenging limitations of bare TiO 2 with large bandgap can be achieved by rational design and fabrication of heterostructures. Multicomponent sulfides with a nature of tunable band structure can be a good alternative to decorating TiO 2 , but there remains a major trade-off between the high efficiency and the long-term durability, so the stability issue must be addressed upon the use of sulfides. Here, an effective strategy is demonstrated with Bi-doped AgIn 5 S 8 (Bi-AgIn 5 S 8 ) decorated TiO 2 photoanode, where twofold enhancement of the photocurrent is achieved. More importantly, it is the first time to integrate polydopamine passivation layer and AgIn 5 S 8 for simultaneously enhancing the solar conversion efficiency and stability. The incident photon-to-current conversion efficiency value is tuned up to 45% (0.4 V vs Ag/AgCl), and the photocurrent density can keep for 90.8% after 5 h. Corresponding hydrogen evolution rate has increased to 8.6 µmol h −1 , which is three times higher than that of bare TiO 2 .
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Wenwen Ma,Yan Xu,Kaiwen Ma,Yuhui Luo,Yushuang Liu,Hong Zhang
PW 11 Sn/TiO 2 (PW 11 Sn = (OTA) 3 PW 11 SnO 39 , OTA = octadecyl trimethyl ammonium) nanofibres with tunable rutile/anatase phase have been successfully prepared via combining with electrospinning and hydrothermal method . The crystal phase of TiO 2 was influenced by the loading amount of PW 11 Sn and the desulfurization efficiency was related with the crystal phase of TiO 2 . When the loading amount of PW 11 Sn on TiO 2 nanofibres was 50%, DBT could be completely removed using 0.02 g PW 11 Sn/TiO 2 nanofibres as catalysts and [Bmim]PF 6 as extraction agent at 60 °C within 20 min, when O/S value was 6:1. Furthermore, the influences of different morphologies and preparation methods for catalysts on desulfurization efficiencies were investigated in detail. This catalyst can be recovered easily and reused at least 7 times maintaining the catalytic activity. For different substrates, the efficiencies of sulfur removal decreased as the following orders: DBT > 4,6-DMDBT > BT under the same conditions. Finally, the mechanism of desulfurization was also elucidated.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
MATERIALS SCIENCE FORUM
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2016
·
IF 0
Ting Xi Li,Hai Bo Su,Li Gao,Lin Jiang,Cheng Xiang Zhang,Yong Qin Han,Yanmin Wang,Qing Wang
Improving the mechanical properties and ultraviolet resistant properties of epoxy resin (EP) is attracting the scientists’ increasing interest in engineering industries at present. For this reason, novel Vi-POSS-TiO2/EPnanocomposites were prepared by incorporating nanotitanium dioxide (TiO2) and PSS-Octavinyl substituted (Vi-POSS) organic-inorganic hybridparticles into the epoxy resin. Filling up with TiO2 and Vi-POSS may create an inherent ultraviolet (UV) absorption property and mechanical property, respectively. The obtained composites were characterized by some standard analytical techniques such as UV-vis spectroscopy, Scanning electron microscope (SEM), and Thermal gravity analysis (TGA). When the content of TiO2was 1.5wt%, UV-vis absorption spectra showed that the excellent absorption properties of EP composites can be achieved. When the content of Vi-POSS was 6wt%, the values of bend strength and impact strength were improved 14.75%and37.94%, respectively. The TGA result showed that the thermal stability of EP composites varied in a small range before and after adding 6wt% Vi-POSS.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2015
·Vol. 15
·期 6
·4676-4681
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IF 1.556
Sun Na,Zhao Xiang,Xiao Zhenggang
In order to improve the compatibility between nanoparticles and polymer matrix, a feasible processing way for grafting polyimides (PI) on the surface of hollow TiO2 particles was developed. Hollow TiO2 spheres were prepared by using polystyrene-methyl acrylic acid
latex as a template starting from tetrabutyl titanate. Surface graft of azide-decorated hollow TiO2 spheres with welldefined alkyne-terminated PI were achieved by “click” chemistry in three steps: (1) choloromethylation and azidization of hollow TiO2, (2)
preparation of alkyne-terminated PI by polycondensation, (3) click coupling between the azidized hollow TiO2 and the alkyne-terminated PI under the catalysis of CuSO4/sodium ascorbate. Fourier transform infrared (FTIR) and Nuclear Magnetic Resonance (1HNMR) spectra were
used to illustrate quantitative transformation of the PI brushes on hollow TiO2 particles into the desired functional group. The morphology of hollow TiO2-PI composite particles was characterized by transmission electron microscopy (TEM) which showed the irregular hollow
structure. The results indicate that the grafting of polymer chains with thermostability and flame retardance on the surface of hollow TiO2 sphere is successful.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 124
·102868-102876
·
IF 3.84
Xiaodong Gu,Nuo Yu,Lisha Zhang,Jianmao Yang,Junqing Hu,Zhigang Chen
Semiconductor photocatalysis technology has great potential to become one of the most promising solutions for energy shortages and environmental pollution, and a prerequisite for the photocatalytic application is to obtain efficient, easily recyclable and large-area photocatalysts with nanostructures. In the present work, we have prepared TiO2 nanorod bundles on carbon fibers as flexible and weaveable photocatalyst/photoelectrode. The growth of TiO2 nanorod bundles is realized by using a dip-coating and hydrothermal growth method. TiO2 nanorod-bundles exhibit square-column appearance with size of about 340–400 nm and length of ∼6 μm, and they are in fact composed of small nanorods with diameters of ∼30 nm. Subsequently, 16 bunches of CFs with TiO2 nanorod bundles can be weaved to be a macroscale CFs/TiO2 cloth (weight: 0.2 g, total area: ∼35 cm2) with excellent conductivity and flexibility. With CFs/TiO2 cloth as the working electrode, photoelectrochemical measurements demonstrate that the separation of photo-induced charge carriers can be improved by increasing the applied voltage bias. Furthermore, under the illumination of simulated solar light, CFs/TiO2 cloth can degrade 94.0% Rhodamine B (RhB) in 100 min by photoelectrocatalytic degradation process (bias: 0.6 V vs. SCE), which is higher than the efficiency from single photocatalysis (60.8% RhB) or electrocatalysis (5.6% RhB) process. In addition, CFs/TiO2 cloth can be easily recycled with good performance stability. Therefore, this kind of CFs/TiO2 cloth can be used as a promising, easily recyclable and large-area photocatalyst/photoelectrode in practical application (such as degrading organic pollutants in lake and/or river). More importantly, this work provides some insights into the design of efficient and macroscale photocatalyst/photoelectrode with other nanosized semiconductor for enhancing visible-light-driven photocatalytic activity.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2012
·
IF 1.376
Yitan Li,Lin Wei,Ruizi Zhang,Yanxue Chen,Jun Jiao
Large area rutile TiO2 nanorod arrays were grown on F:SnO2 (FTO) conductive glass using a hydrothermal method at low temperature. CdSe quantum dots (QDs) were deposited onto single-crystalline TiO2 nanorod arrays by a chemical bath deposition (CBD) method to make a photoelectrode. The solar cell was assembled using a CdSe-TiO2 nanostructure as the photoanode and polysulfide solution as the electrolyte. The annealing effect on optical and photovoltaic properties of CdSe quantum-dots-sensitized TiO2 nanorod solar cells was studied systematically. A significant change of the morphology and a regular red shift of band gap of CdSe nanoparticles were observed after annealing treatment. At the same time, an improved photovoltaic performance was obtained for quantum-dots-sensitized solar cell using the annealed CdSe-TiO2 nanostructure electrode. The power conversion efficiency improved from 0.59% to 1.45% as a consequence of the annealing effect. This improvement can be explained by considering the changes in the morphology, the crystalline quality, and the optical properties caused by annealing treatment.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1334
·
IF 4.501
Fujian Lv,Yingchun Miao,Didi Yang,Bing Mao,Zhenfeng Bian,Fengxia Zhu
The adsorption-enhancing TiO2-SBA-15 photocatalyst has been synthesized by an in situ etching displacement method, which possesses unique regular hexagonal pores and large specific surface area. The as-prepared TiO2-SBA-15 can effectively adsorb and increase the concentration of pollutants in the photocatalyst and collision likelihood with the photogenerated radicals, thus improving the efficiency of photocatalytic organic degradation. The structure and morphology have been characterized by N2adsorption isotherms, X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and scanning electron microscopy (SEM). These characterizations confirm that TiF4alcohol solution prefers to react with the internal surface of SBA-15 because of the Siphon effect. Fourier transform infrared (FTIR) spectra demonstrate that a Ti-O-Si bond formed after the reaction of TiF4with SBA-15, which reveals a wonderful combination of TiO2and SiO2even at low temperatures. Through this function, the nanocomposite TiO2-SBA-15 could obviously improve the efficiency of photocatalytical removal of toluene in the gas phase.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-15
·
IF 3.8
Hao Pengcheng,Shi Rui,Wang Xuanhang,Zhang Juan,Li Bo,Wang Jing,Liu Bo,Liu Yayuan,Qiao Xin,Wang Zhongzhi
Efficient harnessing of solar energy presents a significant challenge in environmental cleanup efforts. This study develops a highly effective carbon quantum dots-modified hollow core-shell TiO 2 -LaFeO 3 heterojunction photocatalyst (CDs-TLFO). Structural analysis confirmed that nanosheets are loaded with CQDs, forming a hollow core-shell structure with intimate interconnection. Photocatalytic experiments reveal that CDs-TLFO degrads tetracycline hydrochloride (TC) 2.02 times faster than TLFO alone, and significantly outperformes h-TiO 2 and LaFeO 3 (11.28 and 2.78 times, respectively). This enhancement is attributed to CQDs acting as electron acceptors with upconversion properties, enhancing the separation of e – -h + pairs and boosting visible light absorption. Integration of CQDs onto the TLFO surface creates numerous active sites and enhances visible light absorption. SEM and TEM tests confirm that the catalyst has a hollow core-shell structure. ESR tests and radical trapping experiments indicate that the high degradation efficiency of the catalyst mainly owns to the synergistic effect of hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ). The reusability and stability of the catalysts are investigated, potential TC degradation pathways are proposed as well as the photocatalytic reaction mechanism is revealed. This research introduces promising avenues for environmental cleanup and offers a straightforward, energy-efficient, and environmentally friendly method for producing CDs-TLFO heterojunction materials with superior photocatalytic capabilities.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）