FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 3
·891-900
·
IF 2.2
Wang Hongyang,Yu Haiyang,Wang Junsheng,Li Ting-Ting,Lin Jia-Horng,Lou Ching-Wen
Cotton fabrics are susceptible to contamination in daily use. Herein, this study developed a scalable and benign strategy to impart superhydrophobic and photocatalytic properties to cotton fabrics by impregnating SiO 2 –TiO 2 Janus particles (SiO 2 –TiO 2 JPs) and silicone elastomer polydimethylsiloxane (PDMS). SiO 2 –TiO 2 Janus particles were synthesized by Pickering template method. The obtained cotton fabrics exhibited good superhydrophobic properties with a water contact angle (WCA) of 155° as well as mechanical and chemical stability. The modified fabrics maintained their superhydrophobic properties against 30 cycles of mechanical abrasion, 15 cycles of tape peeling, and 24 h of UV aging. They also had good resistance to n-hexane, acetone, acid/alkali liquids. The degradation efficiency of Rhodamine B (RhB) was up to 63% after 6 h of UV irradiation and still 48% after 5 cycles of degradation. The facile approach in favor of large-scale preparation showed promising potential for wide application of flexible, superhydrophobic cotton fabrics with self-cleaning performance.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-8
·
IF 2.7
Wang Dongyang,Zou Wenhua,Chen Yexin,Duan Junhong
In this work, different percentages of Eu-doped TiO 2 nanoparticles were synthesized by sol–gel method. The bandgap and conduction band minimum (CBM) of TiO 2 nanoparticles doped by 0.075 at% Eu element is reduced from 3.43 and – 3.93 eV to 3.09 and – 4.25 eV, respectively, deduced from the results of ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurement compared with un-doped TiO 2 . As the increase of Eu concentration, short-circuit photocurrent density J sc of CdSe quantum dot-sensitized solar cells (QDSCs) increases from 10.86 to 13.86 mA/cm 2 , while open-circuit voltage V oc is almost invariable. Optimal power conversion efficiency (PCE) of 4.03% is achieved for CdSe QDSCs with 0.075 at% Eu-doped TiO 2 film. Compared with un-doped devices, the decrease of the chemical capacitance C μ and the increase of recombination resistance R rec of QDSCs based on the 0.075 at% Eu-doped TiO 2 photoanodes can facilitate charge extraction and suppress charge recombination at the TiO 2 /electrolyte interface.
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高影响因子
Science China-Materials
·
2019
·Vol. 63
·期 2
·207-215
·
IF 5.636
Li Nan,Yan Jin,Ai Yuqian,Jiang Ershuai,Lin Liujin,Shou Chunhui,Yan Baojie,Sheng Jiang,Ye Jichun
Conventional titanium oxide (TiO 2 ) as an electron transport layer (ETL) in hybrid organic-inorganic perovskite solar cells (PSCs) requires a sintering process at a high temperature to crystalize, which is not suitable for flexible PSCs and tandem solar cells with their low-temperature-processed bottom cell. Here, we introduce a low-temperature solution method to deposit a TiO 2 /tin oxide (SnO 2 ) bilayer towards an efficient ETL. From the systematic measurements of optical and electronic properties, we demonstrate that the TiO 2 /SnO 2 ETL has an enhanced charge extraction ability and a suppressed carrier recombination at the ETL/perovskite interface, both of which are beneficial to photo-generated carrier separation and transport. As a result, PSCs with TiO 2 /SnO 2 bilayer ETLs present higher photovoltaic performance of the baseline cells compared with their TiO 2 and SnO 2 single-layer ETL counterparts. The champion PSC has a power conversion efficiency (PCE) of 19.11% with an open-circuit voltage ( V oc ) of 1.15 V, a short-circuit current density ( J sc ) of 22.77 mA cm −2 , and a fill factor (FF) of 72.38%. Additionally, due to the suitable band alignment of the TiO 2 /SnO 2 ETL in the device, a high V oc of 1.18 V is achieved. It has been proven that the TiO 2 /SnO 2 bilayer is a promising alternative ETL for high efficiency PSCs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yuanyuan Zhang,Zhichun Si,Jian Gao,Yuxiang Liu,Liping Liu,Xiaodong Wu,Rui Ran,Duan Weng
NaOH-promoted Pt/TiO 2 catalysts are successfully prepared by a facile impregnation method assisted by NaOH and tested for the toluene oxidation reaction under visible light irradiation. Keeping molar ratio of Pt:Na = 1:8, the 0.1Pt-Na/TiO 2 catalyst (0.1 mol% Pt) shows excellent catalytic performance with more than 60% of toluene conversion at 45 °C and achieving total toluene removal at 280 °C, which is significantly better than 0.1Pt/TiO 2 catalyst. The structures and properties of catalysts are characterized by XRD, SEM, N 2 adsorption, XPS and UV–vis spectra. The positively charged Pt species stabilized by NaOH are the most active sites for photo-thermal catalyzing toluene oxidation. The influence of Pt loading and the effect of supports (active TiO 2 and inert Al 2 O 3 ) are also discussed.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 3
·1-9
·
IF 1.455
Guan Yingli,Song Lixin,Zhou Yangyang,Yin Xin,Xie Xueyao,Xiong Jie
Two kinds of TiO 2 microspheres (TMS) with average diameter of 1500 nm but different surface were fabricated by solvothermal method from different Ti source. The effect of TMS on the light harvesting and photovoltaic performance of dye-sensitized solar cells (DSSCs)was investigated. The UV–Vis diffusion reflectance spectra and absorption spectra of N719 dye in detached solutions proved that the TMS showed dual functions of light scattering and dye-adsorption which was an important functional material in DSSCs. The results showed that the TMS made from titanium(IV) isopropoxide with rough surface (TMSR) exhibited better photovoltaic performance than that of TMS made from tetrabutyl titanate with smooth surface (TMSS). To further improve the photovoltaic performance, the double-layered DSSCs made of P25 as an underlayer and TMS as a light-scattering layer (P25-TMS) were fabricated. The photovoltaic performance of double-layered DSSCs was higher than that of the single-layered DSSCs with similar thickness. Especially, the DSSCs made of P25 as an underlayer and the TMSR as a light-scattering layer (P25-TMSR) had a highest power conversion efficiency of 7.62%. This was higher than that of single-layered TMSR-based cell (5.54%), P25-based cell (5.75%), and double-layered P25-TMSS-based cell (6.78%) with similar thickness. This was mainly attributed to the large specific surface area, superior light scattering ability, and fast electron transport of TMSR.
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高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Ming Xu,Shan He,Hao Chen,Guoqing Cui,Lirong Zheng,Bin Wang,Min Wei
The modulation of strong metal–support interaction (SMSI) plays a key role and remains a challenge in achieving the desired catalytic performance in many important chemical reactions. Herein, we report a TiO2–x-modified Ni nanocatalyst with tunable Ni–TiO2–x interaction via a two-step procedure: preparation of Ni/Ti mixed metal oxide (NiTi–MMO) from NiTi-layered double hydroxide (NiTi–LDH) precursor, followed by a further reduction treatment at different temperatures. A combination study (XRD, TEM, H2-TPR, XPS, and in situ EXAFS) verifies that a high reduction temperature enhances the Ni–TiO2–x interaction, which results in an increased coverage degree of Ni nanoparticles by TiO2–x as well as electron density of interfacial Ni (Niδ−). Moreover, the creation of a Niδ−–Ov–Ti3+ interface site (Ov denotes oxygen vacancy) induced by strong Ni–TiO2–x interaction serves as dual-active site to efficiently catalyze the water–gas shift reaction (WGSR). The optimized catalyst (Ni@TiO2–x(450)) via tuning Ni–TiO2–x interaction gives a TOF value of 3.8 s–1, which is ∼7 times larger than the conventional 15%Ni/TiO2(450) catalyst. Such a high catalytic efficiency is attributed to the interfacial site (Niδ−–Ov–Ti3+) with medium strength of metal–support interaction, as revealed by in situ diffuse reflectance Fourier transform infrared spectroscopy (in situ DRIFTS), which promotes the synergic catalysis between Niδ− and oxygen vacancy toward WGSR.
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 18
·8759-8763
·
IF 5.968
Yuhan Lin,Fang Zhang,Daocheng Pan,Hexing Li,Yunfeng Lu
TiO2/(ZnS)x(CuInS2)1−x nanocomposites were prepared from oleic acid-capped TiO2 nanocrystals and alloyed (ZnS)x(CuInS2)1−x nanocrystals. Element mapping and transmission electron microscopy (TEM) results suggested that the nanocomposites exhibit homogeneous composition with uniform mesoporous structure. High photocatalytic activities driven by simulated solar light were achieved owning to their high surface area and efficient electron transfer from (ZnS)x(CuInS2)1−x to TiO2. This work enables the synthesis of a large variety of photocatalysts from nanocrystal building blocks for various applications beyond photodegradation of organic pollutants.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yuanyuan Li,Dongjie Yang,Shuo Lu,Xueqing Qiu,Yong Qian,PengWei Li
TiO2 is widely used in cosmetic products but its poor dispersibility and photocatalytic degradation hazard still affect its performance. In this work, quaternized alkali lignin (QAL) is applied to encapsulate TiO2 by self-assembly and endows TiO2 with excellent sunscreen performance and safety. Results show that the nano TiO2 particles were well trapped in lignin colloidal spheres (LCS) via hydrogen bonding. The LCS encapsulated TiO2 (LCS@TiO2) had a water contact angle as high as 89° in comparison to only 22° in the TiO2 disk control sample. Thus, compatibility with the hydrophobic cream was improved. The photocatalytic activity of TiO2 could be effectively eliminated after modification. The dark color of QAL was significantly whitened by trapped TiO2. When the ratio (w/w) of LCS to TiO2 was 0.5, the LCS@TiO2 presented the best synergistic effect; the sun protection factor (SPF) value of the cream containing 25 wt % LCS@TiO2 reached 84.82.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Pengwei Huo,Ziyang Lu,Xinlin Liu,Di Wu,Xiaolin Liu,Jianming Pan,Xun Gao,Wenlu Guo,Huaming Li,Yongsheng Yan
The surface molecular imprinted photocatalyst of poly- o -phenylenediamine (POPD) modified TiO 2 /fly-ash cenospheres was prepared by molecular imprinted technology with ciprofloxacin (CIP), ethylene glycol dimethacrylate (EGDMA) and acrylamide as the molecular template, cross-linking agent and functional monomer, respectively. The imprinted photocatalysts were further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area, UV–vis diffuse reflectance spectra (UV–vis DRS) and Fourier transform infrared (FT-IR). The preferential selection and activity of imprinted photocatalysts were evaluated by degradation of antibiotic waste water. The results indicate that the surface imprinted photocatalysts could effectively prefer degradation of molecular template and enhance the photocatalytic activity. The imprinted photocatalysts showed higher selection of adsorption and photo-degradation on the molecular template (ciprofloxacin) than non-molecular template. The degradation rate of molecular template could reach 70% in 60 min under visible light irradiation. The degradation intermediate product of ciprofloxacin was further discussed.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Donglai Pan,Zhiya Han,Yingchun Miao,Dieqing Zhang,Guisheng Li
Highly dispersed and thermally stable TiO 2 quantum dots (TiO 2 -QDs) were achieved in the pore channels of SiO 2 foams with large pore size (14–20 nm) via in-situ hydrolysis of Ti-alkoxide. Owing to the anchoring effect between TiO 2 -QDs and the pore-wall of SiO 2 foam, both the TiO 2 phase transformation from anatase to rutile and the aggregation of TiO 2 -QDs were effectively prohibited. The anatase TiO 2 -QDs anchored on the surface of silica foams could be well maintained with a ultrafine crystal size (<7.0 nm) even after high temperature (up to 1000 °C) calcination in air, suggesting a high thermal stability. The sample of TiO 2 -QDs/SiO 2 photocatalysts (molar ratio of Ti/Si = 60%, 900 °C) still exhibited a high H 2 evolution rate (HER, 10399 μmol g −1 h −1 ) for reducing water with a quantum efficiency of 17.8% under UV light irradiation (λ = 365 nm), slightly lower than that of the sample treated at 500 °C. In the absence of the silica foam, the pure TiO 2 crystals calcined at 900 °C crystals nearly cannot exhibit an obvious HER value. Such excellent photocatalytic hydrogen evolution performance was ascribed to the short electron-transfer distance, high anatase crystallinity, uniform dispersity in silica foam, and excellent stability of the TiO 2 -QDs. This proposed route offered an effective platform for fabricating highly active metal oxide QDs with high thermal stability, greatly prolonging the recyclability.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4669-4679
·
IF 2.8
Tang Liping,Wu Yankang,Lei Zhiqiang,He Yu,Chen Jian
An in situ–grown TiO 2 membrane was prepared by an electrospinning method using polyacrylonitrile as the spinning precursor, combined with the TiO 2 hydrolysis mechanism. The performance of tetrabutyl titanate and isopropyl titanate as two titanium source precursors hydrolyzed under the inhibition of acrylic acid to produce TiO 2 with different contents for lithium-ion batteries was compared. The experimental results showed that when both titanium sources were prepared at 3 wt%, the comprehensive performance of the separator manufactured with tetrabutyl titanate as the titanium source (PAN/TBT-3) and isopropyl titanate as the titanium source (PAN/TPT-3) was finest than that of the Celgard 2400 and the composite membrane with direct TiO 2 addition (PAN/TiO 2 -3). The tensile strength of PAN/TPT-3 and PAN/TBT-3 membranes were 7.82 MPa and 4.03 MPa higher than that of Celgard 2400, and 17.03 MPa and 13.29 MPa higher than that of PAN/TiO 2 -3 separator, respectively. PAN/TPT-3 and PAN/TBT-3 membranes exhibited a discharge capacity of 107.72 mAh/g and 115.79 mAh/g at 2 C, and both the capacity retention rate was above 99.5% higher than 80.5% for Celgard 2400.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2079-2092
·
IF 2.993
Yang Maiping,Liu Weiqu,Jiang Chi,Liu Chunhua,He Sha,Xie Yankun,Wang Zhengfang
A facile, mild and low-cost approach of the fabrication of self-cleaning cotton textile, which showed excellent superhydrophobic and photocatalytic properties, was proposed. The surface was firstly coated with pure anatase TiO 2 through a sol–gel method catalyzed by glacial acetic acid and then modified by (heptadecafluoro-1,1,2,2-tetrahydrodecyl) triethoxysilane (F-17). The hydrophilic cotton textile turned superhydrophobic with a water contact angle of 160.0°. The wettability, surface morphology and chemical composition of pristine and modified textile were investigated, respectively. Meanwhile, the robustness of chemical solutions, laundering treatment and water pressure of the textile were all verified by exposing to different pH solutions, organic solvents, washing and immersing. Importantly, the textile surface showed outstanding self-cleaning performance toward solid pollutant, daily liquids, oil and even organic contaminant, attributing to the synergetic function of superhydrophobicity and photocatalysis of TiO 2 nanoparticles. Therefore, the self-cleaning textile is an expected material for daily and industrial applications in diverse conditions, even harsh environment.
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高影响因子
危险品化学品经营许可证（带存储）