CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Juanrong Chen,Yue shen,Junjie Ma,Chaozhong Sun,Sai Zhang,Sisi Xiao,Yingguan Xiao,Shunsheng Cao
Although BiOBr exhibits a good photodegradation activity for organic pollutants due to its special layered structure, low visible-light utilization and insufficiently exposed active sites limit its photocatalytic efficiency. To address these challenges, we construct TiO 2 @BiOBr (HTBB) photocatalyst by coupling hollow spherical structure and p-n heterojunction. The strong built-in electric field can boost efficient charge separation, while hollow spherical structure not only can provide abundant accessible active sites due to its unique two-sided available interfaces, but also can promote light absorption through multiple reflection mechanism. As a result, the degradation rate of levofloxacin (LVFX) over HTBB photocatalyst is as high as 96.25 % under visible light within 1 h and still maintains a high level (>90 %) after five successive cycles. Meanwhile, the photocatalytic performance of HTBB shows excellent harsh environment tolerance. Therefore, this work provides a new insight for constructing BiOBr-based hollow spherical photocatalysts for the treatment of antibiotic wastewater.
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高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Yili Ge,Ying Xiang,Yu He,Meiyan Ji,Gongwu Song
A versatile Zn-TiO2/RH/Fe3O4 ternary composite material on the basis of rice hull was prepared and characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy, energy dispersive X-ray spectroscopy, and vibrating sample magnetometer analysis. Its ability to photocatalytically remove Rhodamine B (RhB) in wastewater was investigated in a photochemical reactor by means of ultraviolet and visible spectrophotometry and FT-IR. Research results show that the catalytic degradation rate of RhB from aqueous solution is close to 100% when using synthesized Zn-TiO2/RH/Fe3O4 as a catalyst under irradiation of visible light for 120 min. The as-prepared visible light-driven photocatalyst Zn-TiO2/RH/Fe3O4 material has high performance with excellent recyclability, magnetic separation feature, and photocatalysis activity in wastewater treatment.
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MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Zhongwei Ge,Chenglei Wang,Zhiyan Chen,Tong Wang,Tao Chen,Rui Shi,Shengqing Yu,Jianqiang Liu
The TiO 2 nanoparticles aggregation (TNA) was synthesized by a novel one-step hydrothermal method in this work. And for the first time we prepared a kind of jelly pastes of TNA used as photoanode for high-efficiency dye-sensitized solar cells (DSSCs). The prepared TNA provides larger specific surface area of 79.34 m 2 g −1 compared with P25 nanoparticles (49.25 m 2 g −1 ), which is beneficial of absorbing more dye molecules and contributes to high current densities. Moreover, the high scattering effect of TNA caused a strong absorption in the visible-light range increasing the number of excited charges and reducing the energy loss. The effect of various concentrations of TNA pastes for DSSCs was studied to explore the superiority of concentrated TNA pastes. The result shows the DSSC based on high-concentration pastes and double-layer film achieved the best power conversion efficiency (PCE) of 8.34 % corresponding the current density of 17.97 mA cm -2 .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yu Xin,Shuqing Nie,Shi Pan,Chang Miao,Haoyi Mou,Minyue Wen,Wei Xiao
The SnSb and TiO 2 nanoparticles uniformly embedded into continuous and conductive carbon nanofibers (CNFs) are successfully fabricated through facile electrospinning combined with calcination treatments. The characterization results of the targeted composite nanofibers (Sb-SnSb/TiO 2 @CNFs-2) confirm that the presence of TiO 2 is of significant importance to construct the elaborately designed and intact fiber structure, in which the optimal dosage of the TiO 2 precursor is precisely controlled at 2 mmol. Moreover, high theoretical specific capacity of SnSb, available inhibitory effect of TiO 2 , and great electronic conductivity of CNFs are cooperatively integrated into the Sb-SnSb/TiO 2 @CNFs-2 composite nanofibers, guaranteeing the enhanced lithium storage capacity and cycling performance when being employed as the anode electrodes. Specifically, the Sb-SnSb/TiO 2 @CNFs-2 electrode can not only deliver initial discharge specific capacity of 1146.6 mAh/g at 100 mA/g and reversible discharge specific capacity of 580.4 mAh/g after 100 cycles, but also retain discharge specific capacity of 561.3 mAh/g after rate cycles along with recovering the current density to 100 mA/g. Importantly, the Sb-SnSb/TiO 2 @CNFs-2 electrode is also endowed with prominent advantages in the pseudocapacitive contribution of 66.89 % at 0.8 mV/s. Those investigations and findings of the Sb-SnSb/TiO 2 @CNFs-2 composite electrodes with facile fabrication process and excellent electrochemical performance can contribute to the practical application of the alloy anodes in the field of the energy storage.
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PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1078
·
IF 3.9
Ze Hong,Jingying Ouyang,Jiaxin Li,Han Zheng,Ying Liu
Multi-heterojunctions are more promising than single heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assembled gold nanoparticles/oxygen-deficient (anatase/B-phase) TiO2multi-heterojunction microspheres using spray pyrolysis and focused on their contact mode-governed photocatalytic activity. The results reveal that using oxygen-deficient (anatase/B-phase) TiO2microspheres as building blocks could significantly enhance the absorption of visible light and the photocatalytic activity of a gold–TiO2system toward the photocatalytic carbon monoxide oxidation. Furthermore, loading gold nanoparticles onto B-phase TiO2could facilitate a more prominent enhancement of activity than that of pure B-phase TiO2, benefiting from the two-electron reduction of oxygen at the interface of TiO2/Au. Meanwhile, the high crystallinity of B-phase TiO2microspheres allows for a gold loading amount of 1 wt% in the gold/(anatase/B-phase) TiO2system, which is 1.67 times more active than pure B-phase TiO2microspheres, in the photocatalytic oxidation of carbon monoxide to generate carbon dioxide.Keywords:photocatalytic carbon monoxide oxidation;B-phase TiO2;oxygen-deficient;microspheres
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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
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·842
·
IF 3.504
Hui Liu,Zhi-Guang Zhang,Hong-Wei He,Xiao-Xiong Wang,Jun Zhang,Qian-Qian Zhang,Yan-Fu Tong,Hong-Ling Liu,Seeram Ramakrishna,Shi-Ying Yan,Yun-Ze Long
To meet the urgent need of society for advanced photocatalytic materials, novel visible light driven heterostructured composite was constructed based on graphitic carbon nitride (g-C3N4) and fibrous TiO2. The g-C3N4/TiO2(CNT) composite was prepared through electrospinning technology and followed calcination process. The state of the g-C3N4and fibrous TiO2was tightly coupled. The photocatalytic performance was measured by degrading the Rhodamine B. Compared to commercial TiO2(P25®) and electrospun TiO2nanofibers, the photocatalytic performance of CNT composite was higher than them. The formation of CNT heterostructures and the enlarged specific surface area enhanced the photocatalytic performance, suppressing the recombination rate of photogenerated carriers while broadening the absorption range of light spectrum. Our studies have demonstrated that heterostructured CNT composite with an appropriate proportion can rational use of visible light and can significantly promote the photogenerated charges transferred at the contact interface between g-C3N4and TiO2.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2017
·
IF 6.198
Zi-Jie Li,Zhi-Wei Huang,Wen-Lu Guo,Lin Wang,Li-Rong Zheng,Zhi-Fang Chai,Wei-Qun Shi
The separation and recovery of uranium from radioactive wastewater is important from the standpoints of environmental protection and uranium reuse. In the present work, magnetically collectable TiO2/Fe3O4 and its graphene composites were fabricated and utilized for the photocatalytical removal of U(VI) from aqueous solutions. It was found that, under ultraviolet (UV) irradiation, the photoreactivity of TiO2/Fe3O4 for the reduction of U(VI) was 19.3 times higher than that of pure TiO2, which is strongly correlated with the Fe0 and additional Fe(II) generated from the reduction of Fe3O4 by TiO2 photoelectrons. The effects of initial uranium concentration, solution pH, ionic strength, the composition of wastewater, and organic pollutants on the U(VI) removal by TiO2/Fe3O4 were systematically investigated. The results demonstrated its excellent performance in the cleanup of uranium contamination. As graphene can efficiently attract the TiO2 photoelectrons and thus decrease their transfer to Fe3O4, the photodissolution of Fe3O4 in the TiO2/graphene/Fe3O4 composite can be largely alleviated compared to that of the TiO2/Fe3O4, rendering this ternary composite a much higher stability. In addition, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES), and X-ray photoelectron spectroscopy (XPS) were used to explore the reaction mechanisms.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Atta Ullah,Hanxing Liu,Abdul Manan,Arbab Safeer Ahmad,Zhai Pengcheng,Hua Hao,Minghe Cao,Zhonghua Yao,Amjad Ullah,Abdullah Jan,Marwa Emmanuel,Javed Iqbal
The solid-state sintering route was employed for the production of (1-x)Bi 2 (Li 0 .5 Ta 1.5 )O 7 -xTiO 2 (x = 0, 0.02, 0.04, 0.06, 0.08) ceramics. The phase, microstructure and microwave dielectric properties of each ceramic composition were determined via X-ray diffraction, scanning electron microscopy and Haki Colmon resonator technique, respectively. The dielectric constant, tan δ and AC conductivity were also determined for the composition of x = 0.04. The TiO 2 addition developed new phases of Bi 3 Ti 4 O 12 and Bi 3 TaTiO 9 for x = 0.04 along with Bi 2 (Li 0 . 5 Ta 1.5 )O 7 phase which disappeared for x = 0.08. The τ f of Bi 2 (Li 0 . 5 Ta 1.5 )O 7 was tuned through zero by TiO 2 addition and good microwave dielectric properties ε r ~67.2, Q u f õ 13,767 GHz and τ f ~ −1.45 ppm/ ° C can be obtained for the composition of x = 0.04 sintered at 1050 °C for 2 h. This ceramic composition is a suitable candidate for 5G cellular base station resonator application.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xin He,Ming Wu,Zhimin Ao,Bo Lai,Yanbo Zhou,Taicheng An,Shaobin Wang
A series of in-situ carbon-doped TiO 2 (C x /TiO 2 ) composites with a porous and crystalline structure were successfully synthesized via one-step and low-temperature calcination of titanium metal–organic framework (MOF), MIL-125(Ti). The resultant materials were comprehensively investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption measurements, UV–vis diffuse reflectance spectrum (DRS), photoluminescence (PL) spectra and photoelectrochemical measurements, and their photocatalytic activities for bisphenol A (BPA) degradation were assessed. Compared with the benchmark TiO 2 photocatalyst (P25), the C x /TiO 2 composite material with high specific surface, lower band gap, and reduced photogenerated electron hole ratio exhibited outstanding photodegradation activity and durability for BPA, which could be attributed to the combined effect of co-doping of multiple carbon species (substituent carbon and carbonate) and porous structure. During BPA degradation, the holes and superoxide radicals were the primary role oxidative species in the reaction process. Therefore, this new efficient photocatalyst is promising candidate for photodegradation of organic pollutants .
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2011
·
IF 2.356
Meilan Wang,Tao He,Yanfei Pan,Weiping Liao,Shangzhou Zhang,Wei Du
Hydrolysis of tetrabutyl titanate (TBT) and crystallization from hydrolyzed intermediates were carried out in a simple ternary system including n -octanol, TBT and water. Anatase TiO 2 nanocrystals (NCS) were prepared with precise size control below 10 nm. The hydrolysis rate at different water concentration ( C water ) was evaluated by measuring the induction time before turbidity changing of the synthetic solution. Fourier transform infrared spectrum (FT-IR) and thermogravimetric/differential thermal analysis (TG/DTA) techniques were applied to make clear the composition of hydrolyzed intermediates obtained at different C water . Powder X-ray diffraction (XRD) technique was used to track the crystallization process of TiO 2 NCS. Transmission electron microscopy (TEM), XRD, FT-IR and TG/DTA techniques were used to characterize the particular properties of NCS. The C water controlled mechanism responsible for the slow hydrolysis and crystallization were discussed. Since no other organic capping ligands or rapid injecting techniques were used to limit NCS’ growth and the solvent n -octanol can be easily separated and reused, this simple synthetic process is of green chemistry and has application potential in large-scale preparation of inorganic NCS.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 34
·22070-22081
·
IF 4.036
Xin Fu,Ruisong Li,Yucang Zhang
This study explores an aerosol-assisted method to prepare an efficient support for the Pt catalyst of polymer electrolyte membrane fuel cells (PEMFCs). Titania nanoparticles and mesoporous niobium-doped titania nanoparticles were prepared by aerosol-assisted self-assembly using titanium(IV) isopropoxide and niobium(V) ethoxide as the titanium and niobium sources for application as non-carbon supports for the platinum electrocatalyst. The structural characteristics and electrochemical properties of the supports were investigated by transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, inductively coupled plasma optical emission spectrometry, and dynamic light scattering. The Brunauer–Emmett–Teller method was used to calculate the specific surface areas of the samples, and the pore size distribution was also examined. The results demonstrated that under a radial concentration gradient, the aerosol droplets self-assembled into a spherical shape, and mesoporous supports were obtained after subsequent removal of the surfactant cetyltrimethylammonium bromide by annealing and washing. The hydrothermal technique was then used to deposit platinum on the TiO2-based supports. The electrical conductivity of the non-carbon support was enhanced by the strong metal–support interaction effect between the platinum catalyst particles and the porous niobium-doped TiO2 support. The half-wave potential, electrochemical surface area, mass activity, and specific activity of the obtained Pt/Nb-TiO2 catalyst all surpassed those of commercial Pt/C.
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