JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Tong Wu,Jingyao Li,Meiqi Chang,Yanhua Song,Qi Sun,Fangke Wang,Haifeng Zou,Zhan Shi
Dual functional Sm 3+ ion doped SiO 2 @TiO 2 composites were designed to investigate their luminescence properties and photocatalytic activities under ultraviolet and simulated solar light excitation, respectively. The TiO 2 :Sm 3+ nanoparticles , SiO 2 @TiO 2 :Sm 3+ nanospheres and SiO 2 @TiO 2 :Sm 3+ nanorods were successfully fabricated via the solvothermal method followed by the calcination at 700, 800 and 900 °C, respectively. The effects of morphology and calcination temperature on photocatalytic activities and luminescent properties were studied. The results demonstrated that the SiO 2 @TiO 2 :Sm 3+ nanorods calcined at 700 °C exhibited the highest luminescence intensities. This was attributed to possess the least specific surface area, which decreased the quenching center of surface defects , as well as without rutile phase. Moreover, SiO 2 @TiO 2 :Sm 3+ nanorods annealed at 800 °C were the optimum for improving the photodegradation efficiency of hydrolyzed polyacrylamide (HPAM) under simulated solar light irradiation. The degradation experiments results confirmed that the synergistic effect of the crystallinity/Ti–O–Si bond was the main reason for excellent photocatalytic activities. As a result, SiO 2 @TiO 2 :Sm 3+ nanorods meet our requirements for better photoluminescence intensities and photocatalytic activities.
研究领域:
材料科学
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光学
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环境科学
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2018
·
IF 4.9
Lin Li,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Biao Zhang,Xuefeng He,Long Jiao,Hao Feng,Wei Zhang
In this study, a novel ternary hybrid CdS/SiO 2 /TiO 2 film was proposed as the phonoanode for the photocatalytic fuel cell. The samples were characterized by X-ray diffraction, scanning electron microscopy and UV–vis absorption. The photoelectrochemical activity of the ternary hybrid electrode was characterized by the photocurrent-time transient response, linear sweep voltammetry and electrochemical impedance spectroscopy. It was shown that CdS/SiO 2 /TiO 2 yielded much higher photoelectrochemical activity than CdS/TiO 2 and bare TiO 2 did. The photoanode with CdS/SiO 2 /TiO 2 showed the highest photocurrent density of 4.6 mA cm −2 , exhibiting a 40% improvement over the conventional CdS/TiO 2 photoanode. The roles of SiO 2 and CdS in such a ternary configuration were elaborated. It was demonstrated that CdS could act as an excellent visible light captaturer to generate photo-induced charge carriers, and SiO 2 as a passivation layer to suppress the interfacial recombination of electrons and holes. Moreover, SiO 2 could allow for more CdS to be deposited at the photoanode owing to its high adsorption capacity . In addition, the effects of the SiO 2 content and the SILAR cycle time on the performance of the CdS/SiO 2 /TiO 2 photoanode were investigated. An optimal SiO 2 content of 10% could yield the best performance. Increasing the SILAR cycle time could improve the photoelectrochemical activity.
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 68
·55363-55371
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IF 3.84
Wai Szeto,Jiantao Li,Haibao Huang,Jin Xuan,Dennis Y. C. Leung
Novel urchin-like microparticles with photocatalytic activity and magnetically separable properties were prepared by a layer-by-layer assembly process. Photocatalytic degradation was investigated using two types of mercury vapor lamps: an ozone generating lamp emitting at both 254 nm and 185 nm as well as a germicidal lamp emitting at 254 nm only. This novel photocatalyst demonstrated superior photocatalytic activity in the mineralization of phenol under UVC illumination compared with the commercial P25, Degussa TiO2, especially in repeated usage. Importantly, this photocatalyst can be quickly separated for reuse simply by using a magnet. The merits of 3D spiny nanostructured TiO2 microparticle photocatalysts are high specific surface area, good permeability, reduced charge recombination rate and high catalytic activity while the incorporation of magnetically separable properties enables rapid and easy retrieval of the suspended photocatalyst after use.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
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IF 4.055
Meiqi Chang,Yanhua Song,Jie Chen,Lei Cui,Ye Sheng,Zhan Shi,Haifeng Zou
SiO2@TiO2:Eu3+ core–shell structure was synthesized by a surfactant-free solvothermal method, and its luminescence intensities were increased through a coating SiO2 layer. Furthermore, SiO2@TiO2:Eu3+@SiO2 core double-shell structures with different coating thicknesses have been prepared to examine the relationship between luminescence intensity and thickness. In addition, luminescence enhancement mechanisms including the surface repair effect and excitation/emitted light absorption effect were proposed. Moreover, the luminescence properties and photocatalytic behaviors of SiO2@TiO2:Eu3+ core–shell structure and its derivatives SiO2@TiO2:Eu3+ yolk–shell structure and TiO2:Eu3+ hollow structure have been investigated in detail. It is worth mentioning that yolk–shell and hollow structures could be obtained by changing the order of the calcination and etching process of the SiO2@TiO2:Eu3+ core–shell structure. Herein, the hollow structure showed the highest luminescence intensity, and the core–shell structure exhibited excellent photocatalytic efficiency for the degradation of methyl orange.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Penghan Cai,Meng Xu,Ming Wei,Tian Zhang,Fei Yao
The SiO 2 –TiO 2 superhydrophilic coatings with photocatalytic activity via heat curing over a low temperature of 100 ℃ were fabricated without a high-temperature calcination process. The effects of the composite ratio of SiO 2 and TiO 2 on the stability of the sols, different treatment processes on the crystalline morphology of TiO 2 , and different solid contents of the sols on the coating properties were investigated. The surface morphology, optical properties and mechanical properties of the coatings were characterised by a water contact angle (WCA) analyser, UV spectroscopy, scanning electron microscopy (SEM) and multiple functional tests. The experimental results demonstrated that the SiO 2 –TiO 2 coating featuring both the intrinsic hydrophilicity of SiO 2 and photophilicity of TiO 2 had the WCA up to 3.5° and exhibited good photocatalytic, self-cleaning, anti-fogging, and mechanical properties.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2019
·
IF 0
Fuhai Cui,Weidong Han,Yang Si,Wenkun Chen,Meng Zhang,Hak Yong Kim,Bin Ding
Catalytic oxidation is an efficient and cost-effective technology to eliminate HCHO, and MnO 2 shows excellent performance towards this kind of reactions. In this work, a birnessite type manganese dioxide nanoparticles modified silica-doped titanium dioxide (MnO 2 @SiO 2 –TiO 2 ) nanofibrous membranes were successfully synthesized by using an electrospinning technique and liquid phase synthesis . It is found that MnO 2 @SiO 2 –TiO 2 -4 nanofibrous membrane showed the best catalytic activity for HCHO removal. The as-fabricated nanofibrous membranes exhibited good and reversible catalytic oxidation activity towards formaldehyde, and more than 90% of the catalytic performance could remain after 5 testing cycles. The successfully constructed MnO 2 nanoparticles decorated soft SiO 2 –TiO 2 nanofibrous membranes, which can be a great promise for effectively solving the problem of environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
MOLECULES
·
2024
·Vol. 29
·期 18
·4391
·
IF 4.2
Kaihui Hua,Zhijing Wu,Weijie Chen,Xiuan Xi,Xiaobing Chen,Shuyan Yang,Pinhai Gao,Yu Zheng
Titanium dioxide (TiO2) is widely employed in the catalytic degradation of wastewater, owing to its robust stability, superior photocatalytic efficiency, and cost-effectiveness. Nonetheless, isolating the fine particulate photocatalysts from the solution post-reaction poses a significant challenge in practical photocatalytic processes. Furthermore, these particles have a tendency to agglomerate into larger clusters, which diminishes their stability. To address this issue, the present study has developed Al2O3–SiO2–TiO2composite semiconductor porous ceramics and has systematically explored the influence of Al2O3and SiO2on the structure and properties of TiO2porous ceramics. The findings reveal that the incorporation of Al2O3augments the open porosity of the ceramics and inhibits the aggregation of TiO2, thereby increasing the catalytic site and improving the light absorption capacity. On the other hand, the addition of SiO2enhances the bending strength of the ceramics and inhibits the conversion of anatase to rutile, thereby further enhancing its photocatalytic activity. Consequently, at an optimal composition of 55 wt.% Al2O3, 40 wt.% TiO2, and 5 wt.% SiO2, the resulting porous ceramics exhibit a methylene blue removal rate of 91.50%, and even after undergoing five cycles of testing, their catalytic efficiency remains approximately 83.82%. These outcomes underscore the exceptional photocatalytic degradation efficiency, recyclability, and reusability of the Al2O3–SiO2–TiO2porous ceramics, suggesting their substantial potential for application in the treatment of dye wastewater, especially for the removal of methylene blue.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 53
·30790-30796
·
IF 3.049
Haoyang Zou,Lan Wang,Huaizhi Tao,Yi Liu,Meiqi Chang,Shiyu Yao
Recently, polyacrylamide (PAM) has been widely used in polymer flooding technology to enhance oil recovery and oil production. However, the difficulty in removing hydrolysed PAM (HPAM) from wastewater still seriously blocks the further application of polymer flooding in the oilfields. Herein, we demonstrate the preparation of SiO2@TiO2:Eu3+@TiO2 core double-shell microspheres (STT) through a two-step solvothermal and sol–gel coating strategy. The as-prepared STT exhibits an ideal photocatalytic activity for the photodegradation of HPAM. More importantly, by using STT as the model, the correlation between fluorescence intensity and photocatalytic activity of the photocatalysts is investigated. The results suggest their oppositional relationship. Since many kinds of photocatalysts are utilized in the degradation of organic pollutants, it is believed that our work will not only promote the development of photocatalysis in the field of oil extraction, but also offer a convenient method for evaluating the photocatalytic activity of the photocatalysts.
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
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Zhiguo Cheng,Kui Cheng,Wenjian Weng
Light-induced cell detachment shows much potential in in vitro cell culture and calls for high-performance light-responsive films. In this study, a smooth and dense SiO2/TiO2 nanocomposite thin film with thickness of around 250 nm was first fabricated on H2O2 treated polystyrene (PS) substrate via a low-temperature sol–gel method. It was observed that the film could well-adhere on the PS surface and the bonding strength became increasingly high with the increase of SiO2 content. The peeling strength and shear strength reached 3.05 and 30.02 MPa, respectively. It was observed the surface of the film could transform into superhydrophilic upon 20 min illumination of ultraviolet with a wavelength of 365 nm (UV365). In cell culture, cells, i.e., NIH3T3 and MC3T3-E1 cells, cultured on SiO2/TiO2 nanocomposite film were easily detached after 10 min of UV365 illumination; the detachment rates reached 90.8% and 88.6%, respectively. Correspondingly, continuous cell sheets with good viability were also easily obtained through the same way. The present work shows that SiO2/TiO2 nanocomposite thin film could be easily prepared on polymeric surface at low temperature. The corresponding film exhibits excellent biocompatibility, high bonding strength, and good light responses. It could be a good candidate for the surface of cell culture utensils with light-induced cell detachment property.
研究领域:
材料科学
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生物医学工程
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细胞生物学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Hongwei Feng,Hui Xu,Hongtu Feng,Ying Gao,Xinyuan Jin
The sol-gel method was used to synthesize Gd-SiO 2 -TiO 2 composite photocatalysts. When the doping amounts of Si and Gd reached 9.1 mol% and 0.2 mol% respectively, the sample showed the optimal photocatalytic activity during the methylene blue (MB) degradation. When the calcination temperature was lower than 550 °C, Gd-SiO 2 -TiO 2 photocatalyst has an anatase crystal structure. After doping of Si and Gd, the absorption wavelength thresholds of the sample approached 407 nm with the energy gap of 3.05 eV. Gd-SiO 2 -TiO 2 photocatalyst showed the degradation efficiency about 90% to methylene blue (MB) under irradiation of simulated sunlight.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xuan Wang,Hao Ding,Guocheng Lv,Run Zhou,Ruixin Ma,Xifeng Hou,Jianmeng Zhang,Wei Li
Generally, superhydrophilic self-cleaning coatings are prepared from semiconductors with photocatalytic properties. Organic pollutants attached to the coating surface can be degraded by its photocatalytic performance realizing a self-cleaning goal. Herein, SiO 2 –TiO 2 composite particles were fabricated by the hydrolysis and precipitation of TiOSO 4 , and SiO 2 microspheres were chosen as carriers, which are inexpensive and environmentally friendly. Then, superhydrophilic self-cleaning SiO 2 –TiO 2 coatings were fabricated by spraying the composites on the surfaces of substrates. The morphology, structure and self-cleaning performance of the SiO 2 –TiO 2 coating were characterized and tested. The results revealed that nano-TiO 2 was loaded on the surfaces of SiO 2 microspheres uniformly forming a hierarchical micro/nanostructure. The SiO 2 –TiO 2 composite particles exhibited excellent photocatalytic degradation performance, and the degradation rate of methyl orange (10 ppm) was more than 98% under UV irradiation for 40 min. Furthermore, the coating prepared with the SiO 2 –TiO 2 composite particles exhibited superhydrophilicity. A water droplet spreads completely on the coating surface in 0.35 s, and the contact angle reaches 0°. In addition, rhodamine B (RhB) and methylene blue (MB) on the coating surface can be degraded efficiently under sunlight irradiation. The SiO 2 –TiO 2 composite particles can be sprayed directly on the surfaces of concrete, brick, wood, and glass slides. Therefore, the particles showed good adaptability to different substrates. The superhydrophilic property was due to the hydrophilicity of SiO 2 and TiO 2 , the hierarchical micro/nanostructure of the SiO 2 –TiO 2 composites, and the photoinduced superhydrophilicity of TiO 2 . The above experimental results show that the as-prepared superhydrophilic self-cleaning SiO 2 –TiO 2 coating has a large application potential.
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
Advanced Materials Technologies
·
2021
·Vol. 7
·期 6
·2101169
·
IF 7.848
Wei Liu,Xue Wang,Zhiyang Zhao,Xin Zhou,Shiliang Huang,Longjin Huang,Zihan Wang,Jingru Li,Junjie Fu,Yu Liu,Sheng Cui,Xuan He
Flexible surface-enhanced Raman spectroscopy (SERS) substrates have received more and more attention for their non-invasive sample collection ability. However, majority of them have poor stability and reproducibility because noble metal is easily oxidized and led to lose SERS activity. Herein, SiO 2 -TiO 2 -Ag hybrids aerogel (STAHA) material is first applied as a flexible SERS substrate for explosives and dyes long-term sensitive detection. The sensitive non-invasive detection of 3-nitro-1, 2, 4-triazol-5-one (NTO) residues can be achieved with a limit of 1 × 10 −6 m by wiping sample collection method. Meanwhile, similar SERS sensitivity from long-term (50 days) kept substrates is observed compared with fresh-made substrates. This long-term sensitivity is contributed to electronic transfer compensation from TiO 2 aerogel. This proposed flexible STAHA enrich the type of SERS substrates, and their long-term sensitivity can provide a prospective application for trace analyses of explosives and other hazardous residues in criminal forensic, military, and security check.
研究领域:
材料科学
·
分析化学
·
环境安全
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）