One-pot solvothermal synthesis of dual-phase titanate/titania Nanoparticles and their adsorption and photocatalytic Performances

Dual phase titanate/titania nanoparticles undergo phase transformation gradually with the increase of solvothermal synthesis temperature from 100°C to 200°C, and eventually are fully transformed into anatase TiO2. The crystal structure change results in the changes of optical absorption, sensitizer/...

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Bibliographic Details
Published in:	Journal of solid state chemistry Vol. 214; pp. 67 - 73
Main Authors:	Cheng, Yu Hua, Gong, Dangguo, Tang, Yuxin, Ho, Jeffery Weng Chye, Tay, Yee Yan, Lau, Wei Siew, Wijaya, Olivia, Lim, Jiexiang, Chen, Zhong
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier Inc 01-06-2014 Elsevier
Subjects:	ABSORPTION ADSORPTION ADSORPTION ISOTHERMS Condensed matter: structure, mechanical and thermal properties Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder Cross-disciplinary physics: materials science; rheology CRYSTAL STRUCTURE Degradation Exact sciences and technology Growth from solutions INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY IRRADIATION Materials science Methods of crystal growth; physics of crystal growth METHYLENE BLUE NANOPARTICLES Nanoscale materials and structures: fabrication and characterization NANOSCIENCE AND NANOTECHNOLOGY Other topics in nanoscale materials and structures Phase diagrams and microstructures developed by solidification and solid-solid phase transformations PHASE TRANSFORMATIONS PHOTOCATALYSIS Photocatalyst Physics REMOVAL Solid surfaces and solid-solid interfaces Solvothermal synthesis Surface chemistry Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) SYNTHESIS Titanate TITANATES Titania Titanium dioxide TITANIUM OXIDES Visible light activity Titanate Visible light activity Adsorption Titania Photocatalyst Solvothermal synthesis Dyes Anatase Catalysts Doping Nanoparticles Visible radiation Crystal growth from solutions Absorption spectra Optical absorption Crystal structure Ultrathin films Phase transformations Photocatalysis Titanates Methylene blue Monolayers Adsorption isotherms Surface area Nanostructured materials
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Summary:	Dual phase titanate/titania nanoparticles undergo phase transformation gradually with the increase of solvothermal synthesis temperature from 100°C to 200°C, and eventually are fully transformed into anatase TiO2. The crystal structure change results in the changes of optical absorption, sensitizer/dopant formation and surface area of the materials which finally affect the overall dye removal ability. Reactions under dark and light have been conducted to distinguish the contributions of surface adsorption from photocatalytic degradation. The sample synthesized at 160°C (S160) shows the best performances for both adsorption under dark and photocatalytic degradation of methylene blue (MB) under visible light irradiation. The adsorption mechanism for S160 is determined as monolayer adsorption based on the adsorption isotherm test under dark condition, and an impressive adsorption capacity of 162.19mg/g is achieved. For the photocatalytic application, this sample at 0.1g/L loading is also able to degrade 20ppm MB within 6 hours under the visible light (>420nm) condition. The effect of solvothermal synthesis temperature on the formation and dye removal performance of dual phase titanate/titania nanoparticles was unveiled and optimized. [Display omitted] •Low temperature one-pot solvothermal synthesis of dual-phase photocatalysts.•Correlation of the synthesis temperature is made with the phase composition.•Adsorption isotherm, kinetics, photocatalytic degradation were studied.•Synthesis at 160°C yields the best material for adsorption of MB in dark.•The same sample also shows the best visible light degradation of MB.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0022-4596 1095-726X
DOI:	10.1016/j.jssc.2013.10.036