Catalysts
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2020
·Vol. 10
·期 8
·942
·
IF 3.52
Zhiying Yan,Zijuan He,Mi Li,Lin Zhang,Yao Luo,Jiao He,Yongjuan Chen,Jiaqiang Wang
In order to further improve the photocatalytic performance of the SiO2/TiO2composite under visible light irradiation, curcumin-doped SiO2/TiO2nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2and TiO2in SiO2/TiO2nanocomposites.Keywords:curcumin pigment;SiO2/TiO2nanocomposites;visible photocatalyst;reduction of Cr (VI)
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiahao Wu,Jeilei Tu,Kai Hu,Xiangjiang Xiao,Lei Li,Shouzhe Yu,Yucen Xie,Hao Wu,Yanyun Yang
Multifunctional coatings with broadband antireflective, durable, photocatalytic , and self-cleaning properties can enhance photovoltaic (PV) power generation by reducing the cleaning frequency and surface light reflection of PV modules . However, such coatings must be cost-effective and maintain their functional integrity under harsh outdoor environmental conditions. In this study, bayberry-like SiO 2 @TiO 2 nanoparticles were prepared by a sol–gel method, and their synthesis procedure and SiO 2 /TiO 2 sol volume ratio were optimized based on the refractive index , transmittance distribution, and methylene blue degradation rate . Afterwards, three-layer gradient refractive index broadband antireflective coatings (TGBA) of the optimized SiO 2 @TiO 2 nanoparticles were simulated theoretically and systematically characterized by various experimental techniques. The average transmittance of TGBA-coated glass was 8.93% (380–1800 nm) higher than that of undipped glass, and the photocatalytic performance of TGBA was verified by studying methylene blue photodegradation . The self-cleaning performance of TGBA was assessed by outdoor exposure, multi-cycle ultraviolet (UV) irradiation, and dark storage. The durability of TGBA was evaluated by conducting hardness measurements , abrasion testing, thermal cycling, and damp heat tests . The external quantum efficiency and J–V curves of TGBA-coated PV mini-modules revealed that their short-circuit current densities and power conversion efficiencies were substantially higher than those of undipped modules. The proposed multifunctional coatings can enhance PV power generation in harsh environments.
研究领域:
材料科学
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光伏技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Dan Wang,Pengkun Hou,Dietmar Stephan,Shifeng Huang,Lina Zhang,Ping Yang,Xin Cheng
For surface functionalization of cement-based materials with photocatalytic properties, weak adhesion between photocatalysis and matrix worsens these properties and results in poor weathering resistance in outdoor environments. To overcome these problems, in this study, two SiO 2 /TiO 2 composites, with different deposited densities of TiO 2 nanoparticles on a SiO 2 sphere, were prepared and used for surface coating of cement-based materials. The two composites show different efficiencies. The photocatalytic results show that the coated cement pastes exhibited excellent rhodamine B-removal efficiency before and after curing and accelerated weathering processes, indicating that SiO 2 in the system has a crucial effect as a ‘glue’ preventing the release of TiO 2 . The bonding mechanism was revealed by the reaction of the samples and main components and hydration products (such as CH, C-S-H and C 3 S).
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2026
·Vol. 16
·期 10
·9280-9292
·
IF 6.1
Wenqian Wu,Weiye Yang,Jiuming Zhong,Hongyan Peng,Lijian Meng,Shihua Zhao
In this research, anatase-phase SiO2@TiO2 spherical photocatalysts were fabricated by the sol–gel method. Comprehensive characteization was performed through SEM, XRD, BET, XPS, PL, and UV-vis spectroscopy to elucidate the materials' morphology, crystal structure, composition, and optical properties. The photocatalytic performance was assessed through degradation rate of Rhodamine B (RhB). The catalyst annealed at 550 °C for 5 h exhibited exceptional activity and degraded 99.75% of RhB under UV light in 40 minutes, revealing a performance surpassing most literature reports. Notably, it retained over 83% efficiency after four cycles, attesting to its robust stability. Moreover, the annealing time exerted little effect on the photocatalytic activity of the photocatalyst. The free radical trapping experiment suggested that under visible light, hydroxyl radicals (˙OH) dominated RhB degradation, while holes (h+) and superoxide radicals (˙O2−) contributed auxiliary roles. Furthermore, the impact of calcination parameters (temperature, duration), and catalyst addition amount, on the degradation of RhB, and the degradation ability of different pollutants was also systematically evaluated. These findings provide valuable insights for optimizing photocatalyst preparation and application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Zhendong Yu,Jingyu Wu,Kaikai Li,Peiwen Wu,Xiaoxiao Yu,Minmeng Tang,Haiyan Liu,Zhichang Liu,Wenshuai Zhu,Chunming Xu
Oxidative desulfurization is an important non‑hydrogen desulfurization technology, but traditional TiO 2 catalysts are subject to the weak acidity and weak adsorption ability towards alkaline sulfide molecules, limited by the long reaction time for deep desulfurization. Herein, based on the principle of Lewis acid-base theory, this work reasonably designs the SiO 2 @TiO 2 core-shell catalyst, which combines excellent catalytic oxidative desulfurization activity and product separation performance. SiO 2 can regulate the acidity of TiO 2 and enhance the enrichment ability of substrate molecules, enhancing the charge transfer process and improving the catalytic performance of TiO 2 . Through systematic characterization, it is confirmed that the Lewis acidity of the core-shell structure originates from unsaturated Ti sites. And the thickness of the TiO 2 shell can be controlled to adjust the surface amounts of acid sites, strengthening the adsorption process of alkaline dibenzothiophenes. The mechanism research reveals the electron transfer between the SiO 2 core and the TiO 2 shell and the generated unsaturated Ti 3+ /Ti 4+ produce a synergistic effect. The generation rates of hydroxyl radicals(·OH) and alkoxy radicals (·OR) are accelerated while changing the Lewis acidity, efficiently adsorbing and oxidizing DBTs. The work expands the application of easy-separation mild Lewis acidic TiO 2 composite materials in the field of catalytic oxidation.
研究领域:
催化化学
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材料科学
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环境化学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 8
·6540-6547
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IF 3.086
Yue Hu,Chen Xiao Shan,Jun Wang,Jun-Ming Zhu,Chao-Qian Gu,Wen-Ting Ni,Dong Zhu,Ai-Hua Zhang
Singly-functionalized nanomaterials cannot fully meet the requirements for biological applications, although most of them have still been used in the enrichment of phosphopeptides. Multifunctional nanocomposites with more capacity for the specific enrichment of phosphopeptides are becoming a new research focus. Here, a simplified and effective system was developed for the fast and highly selective enrichment of phosphopeptides using functionalized SiO2/TiO2 nanocomposites as sorbents. The functionalized SiO2/TiO2 nanocomposites were prepared by an amidation reaction between the amino groups of mesoporous SiO2 nanoparticles and the carboxyl groups of TiO2 nanocrystals. The nanocomposites' surfaces possess high absorption capacity for phosphopeptides, taking advantage of both the strong anion exchange ability of the amine-functionalized SiO2 nanospheres and the high metal oxide affinity of the TiO2 nanocrystals. A simplified approach using a pipette tip filled with prepared functionalized SiO2/TiO2 nanocomposites was applied to enrich phosphopeptides in digests of phosphoprotein (β-casein), mixtures of β-casein and bovine serum albumin (BSA), and non-fat milk. Using this approach, enriched phosphopeptides were obtained from the digested peptides in less than one minute. The phosphopeptides were analyzed by MALDI-TOF-MS, and the limit of detection for phosphopeptides was approximately 10 femtomoles. With highly selective enrichment efficiency, the functionalized SiO2/TiO2 nanocomposites could have great promise for applications in MS-based phosphoproteomics.
研究领域:
纳米医学
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蛋白质组学
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分子生物学
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生物分析化学
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转化医学
✓ 已验证
DOI
高影响因子
THIN SOLID FILMS
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2018
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IF 1.939
Jian Wu,Hongning Wang,Lei Bao,Jing Zhong,Ruoyu Chen,Lin Sun
Uniform raspberry-like hollow SiO 2 @TiO 2 composite nanospheres (hSiO 2 @TiO 2 ) have been designed and prepared via a colloidal assembly method. Series of characterizations, such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy , high resolution transmission electron microscopy, thermogravimetry , and derivative thermogravity, have been carried out to analyze the composition, structure and morphology of the composite. The dispersion of TiO 2 nanoparticles on the outer shell of hollow SiO 2 (hSiO 2 ) nanospheres could be effectively tuned via employing H 2 O 2 as a hydroxyl modifier to repair the Si O bonds of the hSiO 2 . The effects of silanol content of hSiO 2 and the Si/Ti ratios were investigated in detail. This unique structure with refractive index of 1.218 and transmittance over 99% exhibited excellent self-cleaning capability when served as antireflective coatings.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Shan Peng,Weihua Meng,JunXiang Guo,Bo Wang,Zhenguang Wang,Na Xu,Xiaolin Li,Jian Wang,Jianzhong Xu
In this paper, we present a highly efficient, cost-effective, and widely applicable functionalized SiO2/TiO2-polymer based coating to fabricate a translucent, fluorine-free, chemically stable, photocatalytic active, self-healable superhydrophobic coating, which consisted of two mixed functionalized particles (MFP) and polydimethylsiloxane (PDMS) in a proper ratio. Both SiO2 and TiO2 powders were functionalized with PDMS brushes to achieve superhydrophobicity. To maximally optimize its properties, including superhydrophobicity, transparency, and photocatalytic activity, the ratios between MFP with PDMS were carefully studied and optimized. Glass slides coated with this mixed coating (MC) showed translucence with a transparency of 75%. It also presented superior photocatalytic activity and strong UV resistance that could repeatedly degrade organic oil pollutants as many as 50 times, while still maintaining superhydrophobicity even upon exposure to UV light with a high intensity of 80 mW/cm2 for as long as 36 h. When low-surface-tension oils such as dodecane wetted the MC surface, it showed excellent slippery performance and could quickly repel strong acid/alkali/hot water and even very corrosive liquids such as aqua regia. MC achieved extremely stable underoil superhydrophobicity (toward liquids including water, strong acid and base, hot water, etc.) and self-cleaning properties, not only in oils at room temperature but also in a scalded oil environment. Moreover, MC showed self-healable performance after recycled plasma treatment. The stainless steel mesh coated with MC was also used to highly efficiently separate oil–water mixtures. Moreover, harsher liquids including strong acid/alkali solutions/hot water/ice water–oil mixtures could also be successfully separated by the coated mesh. This coating was believed to largely broaden both indoor and outdoor applications for superhydrophobic surfaces.
研究领域:
材料科学
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表面工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 2
·129
·
IF 2.881
Weiping Du,Shuting Cai,Yang Zhang,Huifang Chen
The homogeneous SiO2-TiO2composite sols were prepared by organic-inorganic synchronous polymerization with titanium isopropoxide and tetrabutyl silicate as precursor. The organic-inorganic composite hard coating with Si-O-Ti as the framework was prepared by adding compound crosslinkers (up-401) and 3-Methacryloxypropyltrimethoxysilane (KH-560). The structure of the coating and the hardened film were characterized by infrared spectrum, scanning electron microscopy, atomic force microscopy, particle size analyzer and thermogravimetry. The refractive index, transmittance and hardness of the hardened film were measured by ellipsometry, UV-Vis spectrophotometer and hardness tester. By adjusting the ratio of Si/Ti and optimizing the reaction conditions, the hardness of the hardened film could reach 6H, and the refractive index could be adjusted from 1.55 to 1.76. At the same time, the application of hard coatings on the surface of optical lens were studied.Keywords:resin lens;high refractive index;hard coating;nano titanium dioxide;sol-gelmethod
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 6
·1128-1132
·
IF 0.581
Xuqiang Ji,Niu Yusheng,Xu Yuanhong
Abstract The design and development of excellent microwave absorption (MA) material is significant for healthcare, electronic, and security industries. Herein, a sophisticated composite with the advantages of large interlayer space, nanoparticles with small size, and hierarchical nanostructure (core@shell@void@shell configuration) simultaneously is demonstrated for the first time. Such unique SiO 2 @TiO 2 nanoparticle was fabricated via a multi-step process. Associating maximum reflection loss value can reach –35.2 dB in certain frequency of 11 GHz and thickness of 3.0 mm. Small-sized TiO 2 nanoparticles (about 6 nm) in first coating and large gap between TiO 2 coating layers are significantly critical for the superior MA performance. Our work points a new direction to rationally construct high-performance microwave absorber.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jianjun Li,Yanfeng Wu,Jungang Cao,Zhonglin Wei,Ying Guo,Qun Wang,Qingyu Peng,Yibin Li,Xiaodong He
In this paper, SiO 2 -TiO 2 hybrid fibres are fabricated using the electrospinning technique and Eu 3+ is successfully doped into the fibres through a simple sol-gel approach. The obtained SiO 2 -TiO 2 hybrid fibres are subjected to heat treatments at 600 °C, 800 °C and 1200 °C. The silica fibres subjected to a high temperature of 1200 °C become brittle and easily broken. Furthermore, the X-ray diffraction patterns demonstrate that crystalline titania forms in the SiO 2 -TiO 2 samples treated at 1200 °C, and excellent flexibility is demonstrated in the corresponding SiO 2 -TiO 2 non-woven mat. Moreover, the stress-strain curve demonstrates that the SiO 2 -TiO 2 mat heat-treated at 1200 °C exhibits typical elastic-plastic behaviour. Finally, the emission intensity of Eu 3+ of the SiO 2 -TiO 2 fibres is higher than that of the analogous SiO 2 fibres. This method can be adapted to fabricate inorganic-based hybrid fibres and will pave the way for the implementation of SiO 2 -TiO 2 non-woven mats in related research fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Baojie Zhang,Zongwei Tong,Yifan Pang,Hui Xu,Xiaolei Li,Huiming Ji
Thermal insulation materials play an important role in energy conservation and the sustainable development of natural resources. Herein, novel silica composite nanofibers (SiO 2 NFs) with closed cell structure and excellent thermal insulation performance were designed and prepared via electrospinning technique using hollow SiO 2 /TiO 2 spheres (HSTSs) as pore-forming agent and infrared shielding agent. The addition of HSTSs broke the continuity of heat transfer pathways inside the NFs and enhanced the infrared thermal radiation shielding performance of SiO 2 NFs, endowed it with ultra-low thermal conductivity and low infrared transmittance. Meanwhile, the materials exhibited good flexibility, high tensile strength , low density and excellent thermal stability, indicating promising application as insulation materials. This research not only provides a novel strategy to prepare porous nanocomposite fibers for thermal insulation, but also offers a new insight for the development of porous materials with multiple functions.
研究领域:
材料科学
·
能源工程
✓ 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）