Effects of PVP on structure of TiO2 prepared by the sol-gel process

Zheng, Mao-Ping; Gu, Meng; Jin, Yanping; Wang, Honghua; Zu, Pin-fang; Tao, Peng; He, Jibao

doi:10.1016/s0921-5107(01)00743-7

Cited by 53 publications

(20 citation statements)

References 16 publications

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“…Moreover, the strong hydrogen bond between PVP amide group and metal ion hydroxyl group hinders the condensation reaction and promotes the stress relaxation in the heating-up processes. Hence, during sintering process, PVP is trapped as an organic layer over the active material that extends the homogeneity between the particles [31].…”

Section: Resultsmentioning

confidence: 99%

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Kandhasamy

Pandey

Minakshi

2012

Electrochimica Acta

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Kandhasamy, S., Pandey, A. and Minakshi, M. (2012)Polyvinylpyrrolidone assisted sol-gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery. Electrochimica Acta, 60 (15 Jan This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. polymer assisted sol-gel (SG) methods, is reported as a cathode material for aqueous rechargeable batteries. X-ray diffraction (XRD) analysis confirms phase pure compounds in an orthorhombic structure for both these methods. However, microstructural images show polyvinylpyrrolidone (PVP) assisted SG method aids colloidal growth giving evenly distributed microparticles while SS method tend to an agglomeration during high-temperature processing.The electrochemical properties for SG are seen to be dramatically superior to those of SS. The galvanostatic analysis of the SG shows improved specific capacity over the initial cycles (45 mAh/g and 60 mAh/g for the 1 st and 20 th cycles) and stabilized upon cycling. This unique capability is due to the trapped organic products from the thermal decomposition of PVP that facilitates Li + transfer. The trapped organic coating on the cathode surface without affecting the bulk olivine is evidenced by XRD, FTIR and XPS spectroscopic techniques.

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Section: Resultsmentioning

confidence: 99%

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Kandhasamy

Pandey

Minakshi

2012

Electrochimica Acta

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“…During calcination at 450 • C, TTIP was transformed into crystalline TiO 2 , while the organic POEM, PVP, and solvents were all completely decomposed. The synthesized TiO 2 film on the Al 2 O 3 membrane was found to be highly crystalline and well organized [15,18].…”

Section: Membrane Morphologymentioning

confidence: 98%

Nanostructured Ceramic Photocatalytic Membrane Modified with a Polymer Template for Textile Wastewater Treatment

Ahmad

Kim

et al. 2017

Applied Sciences

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Photocatalytic ceramic membranes have attracted considerable attention for industrial wastewater treatment. However, morphological control of the membrane surface to improve its photocatalytic reactivity for the degradation of organic pollutants remains a challenge. Herein, we report a new nanostructured TiO 2 /Al 2 O 3 composite ceramic membrane prepared from a poly(oxyethylene methacrylate) (POEM) template through a sol-gel method and its photocatalytic performance in the treatment of a model dye compound. The POEM polymeric template allowed the homogeneous distribution of catalytic sites, i.e., the TiO 2 layer, on the Al 2 O 3 membrane surface, resulting in improved organic dye degradation along with effective fouling mitigation. The immobilization of a TiO 2 layer on the Al 2 O 3 membrane support also significantly enhanced the membrane adsorption capacity toward dye organic compounds. An organic removal efficiency of over 96% was achieved with the TiO 2 /Al 2 O 3 composite membrane under Ultraviolet (UV) irradiation. In addition, the self-cleaning efficiency of the TiO 2 /Al 2 O 3 composite membrane was remarkably improved by the degradation of organic foulants on the membrane under UV illumination.

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“…One is the direct nucleation from liquid TiO 2 as rutile phase, and the other is the transformation from the formed anatase phase to rutile phase during cooling process after solidification because the transformation takes place at the temperature higher than 450 to 1100 C. 10,[27][28][29][30] With regard to the transformation evolution of rutile TiO 2 , it can be considered that higher cooling rate during splat cooling will decrease the rutile TiO 2 content owing to a shorter time available for the phase transformation.…”

Section: Phase Evolution During Hvof Deposition Of Tiomentioning

confidence: 99%

Phase Formation during Deposition of TiO<SUB>2</SUB> Coatings through High Velocity Oxy-Fuel Spraying

Wang

et al. 2006

Mater. Trans.

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The crystalline structure of TiO 2 coating is of significant importance for controlling its property and performance, such as photocatalytic activity. The aim of this study is to examine the phase formation mechanisms during high velocity oxy-fuel (HVOF) spraying of TiO 2 coating. TiO 2 coatings were deposited under different spray conditions using both anatase powder and rutile powder as feedstocks. The results showed that the anatase content in the coatings was increased with the increase of fuel gas flow when using the rutile powder as feedstock. A TiO 2 coating of anatase content up to 35% can be obtained by well-melted particles. The high content of anatase phase possibly resulted from rapid solidification and cooling process of the particles. The anatase content in the TiO 2 coating deposited with an anatase powder in partially melted state reached 55-65%. The coating deposited by well-melted anatase powder contained the same anatase content as that by rutile powder. A model was proposed to explain the phase formation within the coatings deposited through HVOF spraying.

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Effects of PVP on structure of TiO2 prepared by the sol-gel process

Cited by 53 publications

References 16 publications

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Nanostructured Ceramic Photocatalytic Membrane Modified with a Polymer Template for Textile Wastewater Treatment

Phase Formation during Deposition of TiO<SUB>2</SUB> Coatings through High Velocity Oxy-Fuel Spraying

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