CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xufeng Zhang,Huidan Zeng,Xin Wang,Weichang Li,Lili Hu,Shubin Chen
MgO–Al 2 O 3 –SiO 2 glass-ceramics have been widely used in military, industrial, and construction applications. The nucleating agent is one of the most important factors in the production of glass-ceramics as it can control the crystallization temperature or the grain size. In this study, we investigated the effect of replacing P 2 O 5 with different amounts of TiO 2 on the crystallization, structure, and mechanical properties of an MgO–Al 2 O 3 –SiO 2 system. The crystallization and microstructure were investigated by differential scanning calorimetry , Raman spectroscopy , X-ray diffraction, scanning electron microscopy, and transmission electron microscopy . The mechanical properties were investigated by measuring the Vickers hardness , Young's modulus , and fracture toughness. The results showed that adding TiO 2 favored the precipitation of fine grains and significantly increased the Vickers hardness, Young's modulus, and fracture toughness of the glasses. Introducing an appropriate amount of TiO 2 can make a glass structure more compact, promote crystallization, and improve the mechanical properties of MgO–Al 2 O 3 –SiO 2 glass-ceramics.
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DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Wen-Long Li,Qi Tang,Li-Long Gao,You-Qing Shen,Bing Yu,Hai-Lin Cong
Photocatalytic technology has attracted wide attention in the application of sewage treatment. Core-shell spheres can have better properties of photocatalytic performance because of the interaction between the core and shell layers with stable core materials. TiO2@SiO2 core-shell microspheres belong to inorganic core-shell microspheres which have gained more and more attention. In this paper, diazo-resin (DR) was chosento crosslink shell and core, which can be a novel way in the synthesis of monodisperse TiO2@DR@SiO2 core-shell microspheres. Because of core-shell structures with TiO2 surface, the obtained TiO2@DR@SiO2 microspheres can be used as photocatalysts.
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015706
·
IF 3.551
Qiao Yin,Zhenzhen Cao,Zhiyuan Wang,Jiaming Zhai,Mingliang Li,Li Guan,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
Photocatalytic degradation of pollutants has been proved to be an effective strategy for wastewater treatment. Herein, TiO2 nanoparticles were synthesized on a Ti3C2 matrix by in situ growth, forming Z-scheme TiO2@Ti3C2/Cd0.5Zn0.5S (TO/CZS) multilevel structured nanocomposites via one-step hydrothermal route. The effects of hydrothermal temperature and Cd0.5Zn0.5S content on microstructure and properties of composites were assessed. TO/CZS nanocomposites were probed into phase composition, morphological and optical properties with x-ray diffractometer, infrared radiation, scanning electron microscope and UV–vis reflective spectra. Following the hydrothermal reaction at 160 °C for 12 h, TiO2 nanoparticles of 30 nm in diameter were generated in situ on Ti3C2 lamina and Cd0.5Zn0.5S particles were evenly distributed on the Ti3C2 matrix. The photocatalytic activity of TO/CZS composites were evaluated, which found that degradation rate constant (k = 0.028 min−1) of TO/CZS-40 on Rhodamine B was 5.19 times that of pure TiO2 and 4.48 times that of Cd0.5Zn0.5S. Through anchoring Ti3C2 as an electron transition mediator and combination with TiO2 and Cd0.5Zn0.5S, the new Z-scheme between TiO2 oxidized by Ti3C2 and Cd0.5Zn0.5S establishes a multilevel structure of separating electron-hole pairs. This work demonstrates a valid way to control electrons and hole transfer directions efficiently through designing multilevel semiconductor structural designs.
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DOI
高影响因子
NANO
·
2018
·
IF 1.1
Yanan Li,Zhongmin Liu,Yaru Li,Yongchuan Wu,Jitao Chen,Yanjun Liu,Ping Na
The Bi 2 S 3 -TiO 2 -RGO composites were synthesized by a facile one-step hydrothermal method and applied for the photocatalytic degradation of Rhodamine B (Rh B) under the visible light. The Bi 2 S 3 -TiO 2 -RGO composites were characterized by transmission electron microscopy, X-ray diffraction, Raman and Fourier transform infrared spectrometer. The results indicated that the Bi 2 S 3 -TiO 2 -RGO composites were successfully prepared, and Ti-O-C and S-C bonds were existing among Bi 2 S 3 , TiO 2 as well as RGO. Furthermore, the photocatalytic ability of Bi 2 S 3 -TiO 2 -RGO composites was excellent under visible light due to its responding to the whole visible light region, low recombination rate of photogenerated electron–hole pairs and relatively negative conduction band. Rh B photocatalytic degradation rate was 99.5% after 50 min and still could reach 98.4% after five cycles. Finally, a formation mechanism as well as a photocatalytic mechanism of Bi 2 S 3 -TiO 2 -RGO composites were proposed based on the experimental results.
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jian Zhang,Yuanchun Li,Congze Liu,Chuntao Zhu,Chen shao,Yue Zhao
Semiconductor photo-electrocatalytic technology is considered as an efficient and environmentally friendly wastewater treatment and energy production technology. TiO 2 NTs is widely used in the field of photoelectricity catalysis because of its chemical stability and good recycling. In this paper, g-C 3 N 4 and Ag nanoparticles were deposited on the surface of TiO 2 NTs by solid-phase sublimation and electrodeposition method to prepare Ag/g-C 3 N 4 /TiO 2 NTs composite photo-electrocatalytic materials. The Ag/g-C 3 N 4 /TiO 2 NTs composites showed significant photo-electrocatalytic activity compared with the single component materials. The mechanism of enhanced catalytic activity is that the tight interface formed between Ag, g-C 3 N 4 and TiO 2 NTs, facilitating the photoinduced electron migration from g-C 3 N 4 to TiO 2 NTs and inhibiting the recombination of carrier pairs under the cooperative mechanism of photoelectric catalysis. The results of five cycle experiments show that Ag/g-C 3 N 4 /TiO 2 NTs has good stability. LC-MS and ECOSAR analysis results indicate that Ag/g-C 3 N 4 /TiO 2 NTs photo-electrocatalytic system can be safely used for wastewater degradation treatment.
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DOI
高影响因子
Nano Energy
·
2012
·
IF 0
Chenbo Wang,Zifei Jiang,Lin Wei,Yanxue Chen,Jun Jiao,Micah Eastman,Hong Liu
We combine CdS semiconductor quantum dots and single-crystalline rutile TiO 2 nanorod arrays to produce a practical quantum dot sensitized solar cell . A facile wet-chemical approach was implemented for growth of this CdS@TiO 2 architecture. Rutile TiO 2 nanorod arrays with lengths of 1–2 μm and diameters of 40–60 nm were synthesized on fluorine-doped tin oxide glass by a hydrothermal process in a titanium tetrachloride precursor solution . CdS quantum dots with a size of 5–10 nm were deposited onto a TiO 2 nanorod surface using an ultrasonic-assisted chemical bath deposition method . The resulting CdS quantum dots and TiO 2 nanorods formed a type-II heterojunction and showed increased absorption over visible light range. Incident photon-to-current conversion efficiencies (IPCE) as high as 85% and power conversion efficiencies of 2.54% were obtained using a polysulfide electrolyte.
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DOI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 7
·076502
·
IF 4.386
Zhuangzhuang Yin,Shihan Qi,Shangkun Deng,Jun Guo,Wei Gan,Peng Chen,Chunsheng Ding,Ziliang Li,Jianrou Li,Yuqing Lu,Ziwei Zhao,Qi Ling,Miao Zhang,Zhaoqi Sun
Transition metal sulfides are widely used for the modification of TiO2 to improve its light absorption range due to their small bandgaps. In this work, novel CoS/CuS/TiO2 was synthesized via a simple one-pot hydrothermal preparation method. Using various characterization techniques, CoS/CuS/TiO2 was found to demonstrate excellent photoelectrochemical performance and photocatalytic activity for the degradation of tetracycline hydrochloride. The CoS/CuS/TiO2 catalyst showcased a maximum photocurrent density of 55 μA cm−2, which was 7.8 times higher than that of unmodified TiO2 nanorods. Under visible light irradiation using Xe lamp, the photocatalytic degradation efficiency of CoS/CuS/TiO2 on tetracycline hydrochloride was found to be significantly improved, where it recorded an excellent degradation rate of 64.0% at 90 min. The charge transfer mechanism of the proposed material was also investigated.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Mingming Zou,Honghong Liu,Lu Feng,Fengqiang Xiong,Tiju Thomas,Minghui Yang
A simple solvothermal approach with post-calcination is used to obtain (Ag, Ag 2 O) co-loaded TiO 2 microspheres with high specific surface area (43.8 m 2 g -1 ) and desirable visible light photocatalytic degradation (64% after 2 h visible light irradiation). Generally, N-doping of TiO 2 via nitridation using NH 3 improves the visible light absorption property of material. However, nitridation of (Ag, Ag 2 O) co-loaded TiO 2 results in a deleterious impact on the photocatalytic performance (around 20% after 2 h visible light irradiation). This is because nitridation of Ag-Ag 2 O-TiO 2 results in (a) reduction of Ag 2 O to Ag and (b) Ag agglomeration and grain growth on TiO 2 particles. These results in fact imply that in as-synthesized (Ag, Ag 2 O) co-loaded TiO 2 systems, local surface plasmonic resonance (associated with of 5–12 nm Ag particles) aids in enhanced broad band visible light absorption; furthermore the heterojunction between TiO 2 and Ag 2 O improves efficiency with which photogenerated carriers become available for photocatalysis . In all cases we show through selective radical quenching experiments that singlet oxygen is the primary reason for the dye degradation observed.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 14
·2760
·
IF 4.967
Yu Ren,Ziyao Zhao,Wenwen Jiang,Guangyu Zhang,Yuxin Tan,Yongyin Guan,Long Zhou,Li Cui,Sung Woong Choi,Mei-Xian Li
In this study, Y2O3/TiO2-loaded polyester fabric was prepared to improve the catalytic activity of the TiO2and to increase its reuse efficiency. The samples were systematically characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FT-IR). Furthermore, the degradation performance of methyl orange in the presence of simulated visible light irradiation was also investigated. The results showed that the TiO2in the Y2O3/TiO2composite photocatalyst was suitably anatase. In addition, Y2O3/TiO2-loaded polyester fabric had higher photocatalytic performance than that of pure polyester fabric under visible light and the degradation rate reached 83% after 120 min of light exposure but remained above 50% after repeated exposure (three times). Compared to the pure polyester fabric, Y2O3/TiO2-loaded polyester fabric had self-cleaning effects in methyl blue and soy sauce solutions under visible light.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Luo Huang,Yuan Yu,Dongfeng Sun,Fangyou Meng,Li Li,Mengfan Niu,Xiang Bi,Songmin Lin,Wenhui Chu,Bingshe Xu
In this work, we applied the fenton-like reaction to fabricate TiO 2 nanocrystalline , and employed molecular self-assembly with TiO 2 and BiOCl to form composite photocatalyst with cookie-like nano-heterostructure for enhanced solar energy to hydrogen. The TiO 2 @BiOCl photocatalyst with cookie-like nano-heterostructure exhibited excellent photocatalytic performance for the photocatalytic hydrogen evolution under sunlight irradiation compared to the single TiO 2 or BiOCl. Besides, the TiO 2 @BiOCl photocatalyst displayed outstanding reusability and stability in the photocatalytic reaction. Meanwhile, the possible mechanisms of cookie-like nano-heterostructure formation and photocatalytic redox reaction have been proposed. What's more, this work demonstrated a new perspective for the design and mass preparation of TiO 2 -based composite photocatalytic materials at atmospheric condition, which demonstrated that this method has enormous potential to achieve mass preparation of efficient photocatalyst for photocatalytic application.
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Na Sun,Jiaojiao Song,Qingmei Tao,Erjie Kan,Long Kuai
Photocatalysis utilized solar energy with metal oxide semiconductors has been considered as one of the attractive green routes for organics’ conversion. The construction of high-density co-catalytic sites is essential for the surface reaction kinetics . In this work, a high-efficiency mesoporous TiO 2 decorated with single atomic Pt loading of 1 at% (2.1 wt%) had been successfully achieved. The high specific surface area of mesoporous TiO 2 affords adequate physical surface for the resident of atomic Pt, thus stabilizing a high areal density of single-atom reaction sites. The optimized single-atom Pt/TiO 2 revealed a performance of 4.1 mmol/h/g cat for photocatalytic oxidation of benzyl alcohol under visible light irradiation that is 3.8 folds than that of Pt-modified commercial TiO 2 photocatalysts . The reactivity will further enhance after the introduction of plasmonic Au nanoparticles and the finally sample (1 at % Pt-0.075 at % Au)/TiO 2 -MP exhibited salient activity (4.5 mmol/h/g cat ) and stability. This work paves a potential way to boost the performance of metal oxide semiconductors for green photocatalytic conversion of organics.
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DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Ying Tang,Rajarshi Roy,Zuhong Zhang,Yanchun Hu,Feng Yang,Chaochao Qin,Lulu Jiang,Hairui Liu
Adjusting the electron transport layer (ETL) is an effective method to improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) as well as suppress their hysteresis. In this study, we report that RbCl doping TiO 2 can enhance the crystallinity of perovskite and reduce hysteresis as well. As RbCl crystallite has a polyhedral structure and lattice parameters similar to those of the perovskite by calculation confirmed. According to the seed-mediated growth theory, seed-mediated perovskite formation results in a dense and uniform active layer with excellent crystallinity and low trap density, which can reduce the interfacial charge accumulation and carrier recombination. Consequently, the PSCs with the RbCl-doping ETL show remarkably enhanced performance (from 18.67% to 20.75%). Impressively, negligible hysteresis, high fill factor (FF, over 80%) can be observed for the perovskite with the modified ETL. This work is expected to provide a viable path to design a simple-processing ETL for efficient PSCs.
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高影响因子
危险品化学品经营许可证（带存储）