Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Yuzhen Liao,Zhi Zhou,Sheng Dai,Lang Jiang,Ping Yang,Ansha Zhao,Lei Lu,Jiang Chen,Nan Huang
Titanium dioxide (TiO 2 ) is a widely used biomaterial. It is a great challenge to confer antibacterial and antithrombotic properties to TiO 2 while maintaining its cell affinity. Here, we developed a new strategy to achieve the above goal by comprehensively controlling the chemical cues and geometrical cues of the surface of TiO 2 . Using colloidal etching technology and UV irradiation treatment, we obtained the photofunctionalized nano-micro-honeycomb structured TiO 2 . The honeycomb structured increased the photocatalytic activity of TiO 2 , which endowed TiO 2 with photo-induced superhydrophilicity to inhibit bacterial adhesion. The high photocatalytic activity also induced the strong photocatalytic oxidation of TiO 2 surface organic adsorbates to suppress fibrinogen and platelet attachment. In addition, owing to the micropore trapping-isolation effect on the bacteria and the nano-frames' contact guidance effect on the growth and spreading of platelet pseudopods, the honeycomb structure also shows a considerable inhibiting effect on bacterial and platelet adhesion. Therefore, due to the controlled chemical and geometrical cues' synergistic effect, the photo-functionalized TiO 2 honeycomb structure shows excellent bacterial-adhesion resistance and antithrombotic properties. More importantly, the photo-functionalized TiO 2 honeycomb did not inhibit the adhesion and growth of endothelial cells (ECs) after culturing for 3 d, indicating a good cell affinity that the traditional antifouling surfaces do not possess.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinyu Du,Xue Bai,Lu Xu,Lei Yang,Pengkang Jin
A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation . The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 − , OH and h + all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol , bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tarek A. Gad-Allah,Ruiyang Zhang,Yi Wang,Ying Zhou
Various factors control the photocatalyst efficiency including the lifetime of photogenerated charge carriers, photocatalyst surface energy, and light harvesting efficacy. In this study, the defective (001)-TiO 2 -x/h-BN composite was synthesized by a facile one-pot method to merge the fantastic features of the reactive metastable (001) facet and self-defects in TiO 2 anatase crystals with the 2D h-BN. Pure anatase phase of TiO 2 was obtained by the suggested preparation method, which contains ∼33 % of the exposed (001) facet. The predominancy of oxygen vacancy in TiO 2 crystals was proved experimentally and theoretically by the DFT calculations. The defects in TiO 2 along with the incorporated h-BN caused better light harvesting and longer charge lifetime. The prepared defective (001)-TiO 2 -x/h-BN was applied efficiently for NO removal with very limited release of the toxic NO 2 by-product as an environmental application. The detected oxygen vacancy in TiO 2 along with h-BN were found to play a synergistic enhancement for NO removal. However, more defects reduced the overall activity because of rapid oxidation of oxygen vacancies on surface of the photocatalyst. To sum up, the defective (001)-TiO 2 -x/h-BN composite can be considered as a promising material for environmental applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Qian Peng,Xuekun Tang,Kun Liu,Wanling Zhong,Yingjie Zhang,Jiajie Xing
Heterogeneous photocatalysts with high catalytic performance and recyclability have attracted widespread attention in organic wastewater treatment . In the study, we designed and synthesized a novel ternary BiOCl/TiO 2 /silica nanofibers (BTS) composite with enhanced photocatalytic performance via a modified sol-gel method and precipitation/calcination method. In the composite, BiOCl nanosheets and TiO 2 nanoparticles are uniformly dispersed on the surface of silica nanofibers in turn, where they are closely combined to form BiOCl/TiO 2 heterojunction structure. The composite displays superior degradation performance for rhodamine B (RhB) than bare BiOCl or TiO 2 as well as TiO 2 /silica nanofibers (TS). The excellent photocatalytic performance of BTS is mainly attributed to the enhanced dispersibility of BiOCl and TiO 2 given by SNF and the effective construction of BiOCl/TiO 2 heterojunction. The radical scavenger and EPR tests found that superoxide radical anions (O 2 •− ) are the dominant active species in the reaction system. It is proposed that the BTS composite shows great potential for wide application in the field of sewage treatment driven by solar energy.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hui Feng,Wensheng Liu,Xinke Hu,Liufang Chen,Aiming Tang,Haiping Wang,Yao Huang
A novel (MoS2/C3N4)-sensitized TiO2 nanotube array (NTA) photoelectrode has been prepared by a simple hydrothermal synthesis and high-temperature calcination. When petal-like MoS2 nanosheets are uniformly distributed on the surface of TiO2 nanotubes coated with layered C3N4, a notable red-shift and high absorption are observed in the visible light region. The photocurrent density (mA cm−2) systematically increases from TiO2 NTAs (0.97), C3N4/TiO2 (1.25), MoS2/TiO2 (1.50), to TiO2/MoS2/C3N4 (1.97) under visible light irradiation, due to the dual S-scheme semiconductor heterostructures comprising multiple components with a staggered band offset. Such a heterostructure exhibits an enhanced photocatalytic performance towards the degradation of organic contaminants, e.g. P-nitrophenol (PNP) and rhodamine B (RhB).
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高影响因子
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2025
·
IF 5
Ao Liu,Xue Feng,Zhaofeng Chen,Shijie Chen,Lixia Yang,Yucheng Guo,Pengze Yang,Zhiyuan Ma,Yiran Lin,Wei Zheng
To improve the thermal insulation and mechanical properties of aerogels at high temperatures, TiO 2 hollow-sphere-doped SiO 2 fiber-reinforced SiO 2 aerogel composites (TSA) were fabricated via a crushed ice templating method. The TiO 2 hollow spheres suppressed radiative heat transfer, and the ice templating produced a uniform isotropic structure. Using the Box–Behnken response surface methodology and a multi-objective grey wolf optimization algorithm combined with TOPSIS, the optimal formulation was determined as 4.5 wt% silica sol, 9.9 wt% SiO 2 fibers, 11.8 wt% TiO 2 hollow spheres, and 73.8 wt% SiO 2 aerogel powder. The optimized sample showed a surface temperature of 42.8 °C and a compressive strength of 29.7 kPa under a 500 °C heat source. This work demonstrates an effective strategy for designing high-performance thermal insulation aerogels.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoyu Wang,Peng Li,Mingyue Yang,Jianwei Zhao,Tao Wang,Dong Hao
Two-dimensional materials have garnered significant attention in recent years due to their remarkable electron-hole transfer capability. However, the advancement of convenient and rapid synthesis techniques remains crucial for further research in this field. In this study, lamellar anatase/rutile-TiO 2 phase heterojunctions with a favorable phase interface was synthesized through a fast annealing route using glucose as the template and titanium tetrachloride. The sample synthesized at 600 °C with a holding time of 20 min exhibited the most significant levels of H 2 evolution activity (53.22 mmol g −1 h −1 ) with a low loading of 0.05 wt% Pt co-catalyst, which is significantly higher than the commercial P25 sample. The characterization reveals that the anatase/rutile-TiO 2 phase heterojunction in the two-dimensional sheet exhibits excellent phase interface contact and possesses a large specific surface area with an appropriate pore size. These characteristics are advantageous for facilitating the separation and migration of carriers, thereby enhancing the efficiency of the H 2 production reaction through hydrolysis. This study presents a novel approach towards the advancement of highly effective two-dimensional photocatalysts.
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高影响因子
iScience
·
2025
·
IF 4.1
Yangfan Du,Keyi Han,Mingqing Zhang,Xinyu Zhao,Xin Zhang,Yingbin Liang,Jie He,Shifeng Wang,Yong Li
Environmental pollution poses a pressing global challenge, and photocatalysis represents a promising remediation technology. However, photogenerated carrier recombination remains a critical limitation. In this work, silver quantum dots (Ag QDs) were anchored onto sea urchin-like TiO 2 (U-TiO 2 ) to construct an Ag–TiO 2 interfacial electron transfer channel. This channel facilitated rapid carrier separation and migration, thereby effectively suppressing recombination. Moreover, the Ag QDs exhibited a pronounced localized surface plasmon resonance (LSPR) effect that broadened the light absorption range into the visible and near-infrared regions. Under LSPR excitation, the electron chemical potential in Ag QDs was elevated, further enhancing photocatalytic activity. Additionally, the unique urchin-like morphology of U-TiO 2 provided a large specific surface area, enhancing pollutant adsorption and offering abundant reactive sites. Benefiting from the synergy between the interfacial electron transfer channel and LSPR, the Ag QD–modified U-TiO 2 photocatalyst exhibited outstanding degradation performance and great potential for environmental purification applications.
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DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Lianqing Yu,Yanxing Liu,Lijie Duan,Yaping Zhang,Liana Alvares Rodrigues,D. Amaranatha Reddy,Haifeng Zhu
Construction of heterojunctions has been shown to be one of the most promising methods for the preparation of highly efficient catalysts, because it is feasible and effective for the separation of electron-hole pairs, prolonging the lifetime of photogenerated electrons. In this study, TiO 2 was grown on fluorine-doped tin oxide glass (FTO), and then a strontium source was added to obtain heterojunctions between SrTiO 3 and TiO 2 using in-situ ion exchange hydrothermal method. The in-situ grown SrTiO 3 /TiO 2 (TST) composite has a better absorption performance, a narrower band gap, and a lower carrier recombination rate compared to the pure TiO 2 sample, which improves the photoelectrochemical performance. The photocurrent density of TST-10 (hydrothermally treated for 10 h) has the largest value of 0.06 mA·cm −2 , which is about three times higher than that of pure TiO 2 . Then, the first-principles density functional theory (DFT) calculation was used to further explore the photocatalytic mechanism of TST. The exchange correlation energy was based on the Generalised Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional calculation method to study the electronic and optical properties of SrTiO 3 /TiO 2 heterostructures. The results show that the carrier transfer rate and the optical absorption coefficient of the material increase significantly after the establishment of the in-situ heterojunction. This study offers insight into the heterostructures’ interface significance on photocatalytic activity.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huidong Gu,Chang Feng,Hai-ou Zhu,Haikui Zhu,Xifeng Ding,Lixi Wang,Guohui Zhou,Meng Wang,Shiwo Ta,Qitu Zhang
Li 3 PO 4 ceramic is a promising microwave ceramic material with low dielectric constant. The effect of Li nonstoichiometry on phase compositions, microstructures, and microwave dielectric characteristics of Li 3 PO 4 ceramics, on the other hand, has been examined infrequently. Therefore, in the first part of this study, the stoichiometry and Li nonstoichiometry compositions based on Li 3+x PO 4 (x = 0, 0.03, 0.06, 0.09, 0.12 and 0.15) were prepared by conventional solid-phase method. The results show that a few nonstoichiometric lithium ions enter the lattice of Li 3+x PO 4 . Compared with the chemical content of Li 3 PO 4 , the sintering characteristics, relative dielectric constants and quality factors of Li 3+x PO 4 ceramics can be improved by slightly excessive Li ions, while the properties of Li 3 PO 4 ceramics can be deteriorated by excessive Li ions. Li 3.12 PO 4 ceramics sintered at 975 °C for 2 h have good dielectric properties ( ε r = 5.89, Q×f = 44,000 GHz, τ f = −206 ppm/ ° C). In order to improve its large negative temperature coefficient of resonant frequency, in the following study, rutile nano TiO 2 particles were added as τ f compensator. Adding TiO 2 powders not only effectively improve the temperature stabilities of the multiphase ceramics, but also make the grain growth more uniform. With the increase of TiO 2 content from 0.40 to 0.60, τ f increases from −73.5 ppm/ ° C to +42.3 ppm/ ° C. The best dielectric property of 0.45Li 3.12 PO 4 -0.55TiO 2 composite ceramic is ε r = 13.29, Q×f = 40,700 GHz, τ f = +8.8 ppm/ ° C.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 12
·13161-13170
·
IF 1.798
Qin Tianxiu,Zhang Shuxia,Chen Pei,Zhao Fengqi,Gao Hongxu,Chen Xinbing,An Zhongwei
TiO 2 nanocrystals are inserted in the pores of monodispersed mesoporous SiO 2 nanospheres with 20–35 nm diameter by a facile two-step method involving vacuum-rotary evaporation and subsequent calcination. Characterization by XRD, TEM, EDX, FT-IR and N 2 sorption techniques suggests that, the pores of the mesoporous SiO 2 nanosphere can effectively stabilize the anatase phase of TiO 2 nanocrystals with size about 6 nm even at high temperature of 750 °C. The photocatalytic activities of the samples with different TiO 2 loading amount were evaluated by the degradation of Rhodamine B dye in aqueous solution under UV-light irradiation. It is found that photocatalytic efficiencies of these materials are much better than commercial P25. Where the sample with TiO 2 loading of 43 % exhibits the highest photocatalytic efficiencies with complete degradation of Rhodamine B within 32 min, which is attributed to the balance between high surface area and suitable TiO 2 loading amount.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 11
·1-13
·
IF 2.101
Hou Yanhui,Wang Yechen,Yuan Huili,Chen Hang,Chen Guowei,Shen Junhai,Li Liangchao
Heterogeneous photo-Fenton SiO 2 /Fe 3 O 4 /C@TiO 2 (SFCT) catalyst with a core-multishell structure and a diameter of about 550 nm was successfully prepared and was characterized by scanning electron microscopy (SEM), TEM, XRD, Raman, and Fourier transform infrared (FT-IR). The results illustrated that anatase TiO 2 coexisted with rutile TiO 2 , in which the anatase phase was the main crystal phase. In addition, the catalytic activity of SFCT catalyst had been evaluated in the catalytic degradation on p-nitrophenol (PNP). The influence factors on the PNP degradation, including SFCT component ratio ( m
SFC / m
TiO2 ), H 2 O 2 dosage, solution pH, and PNP concentration, had been investigated. And the contrast experiments about the photo-Fenton catalytic mechanism revealed that the SFCT-2 catalyst possessed a superior activity in the neutral environment due to the optimal activity matching between Fe 3 O 4 and TiO 2 , and it exhibited the stable catalytic performance after five successive recycles. Therefore, the SFCT-2 catalyst had a promising application for the photo-Fenton degradation of organic contaminant.
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