Synthesis and Characterization of Rutile Nanocrystals Prepared in Aqueous Media at Low Temperature

Kong, Linggen; Karatchevtseva, Inna; Blackford, Mark G.; Chironi, Ilkay; Triani, Gerry

doi:10.1111/j.1551-2916.2011.05002.x

Cited by 15 publications

(8 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4g shows the selected area electron diffraction (SAED) pattern exhibiting sharp uniform rings, confirming that the beads are highly crystalline and randomly oriented. 22 Analysis of the diffraction pattern undoubtedly indicates that the SMATBs are the anatase polymorph of TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

et al. 2013

View full text Add to dashboard Cite

The effect of reaction temperature and aging time on TiO 2 precursor beads synthesized using a sol-gel method was studied. The size of the precursor beads decreased and deformed spheres appeared with increasing temperature. Meanwhile, TiO 2 precursor beads grew with the aging time up to a reaction time of 18 h. Using a solvothermal process for the precursor beads, submicron-sized mesoporous anatase TiO 2 beads (SMATBs) with a specific surface of 153.2 m 2 g 21 , much higher than initially reported, were synthesized by controlling the reaction conditions and were successfully employed as negative electrode for Li-ion batteries. The specific capacities of the submicron-sized mesoporous TiO 2 beads are much higher than those of their counterparts at high charge-discharge rates. In the first cycle, the TiO 2 beads showed discharge capacities of 172.0 mA h g 21 , 129.6 mA h g 21 , 117.1 mA h g 21 and 56.7 mA h g 21 at chargedischarge rates of 1 C (1 C = 170 mA g 21 ), 5 C, 10 C and 30 C, respectively. 85.1% discharge capacities were retained after 200 cycles at 1 C charge-discharge rate. After 600 cycles, there is still 81.8% discharge capacity retained at 5 C charge-discharge rate. Moreover, the TiO 2 beads also exhibitied 86.9 mA h g 21 and 34.0 mA h g 21 discharge capacities at 10 C and 30 C charge-discharge rates over 600 cycles, respectively. In addition, the Coulombic efficiency is nearly 100% at each cycle at various charge-discharge rates.

show abstract

Section: Resultsmentioning

confidence: 99%

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The aging of titanatrane isopropoxide in HNO 3 (40-50 C, 12-24 h) showed pure rutile. 391 The amorphous titania dissolved into a transparent titania gel in a stirred acidic solution (HCl or HNO 3 ) reprecipitated as rutile aer aging for a long time (48 h) This journal is © The Royal Society of Chemistry 2014 mole fraction of rutile decreased with an increase in the treatment temperature and pure anatase was obtained at temperatures >150 C. It was suggested that a stable rutile nucleus with a compact structure is formed by a very slow reprecipitation rate at temperatures <60 C, while anatase was formed at high temperatures due to a larger reprecipitation rate. 392 In a modied dissolution-reprecipitation process, rutile particles dissolved in H 2 SO 4 and reprecipitated with NH 3 showed anatase-rutile aer calcination (450-900 C, 1 h).…”

Section: Thermolysis With Other Titanium Precursorsmentioning

confidence: 99%

“…430 Compared to the trivial titanium precursor, titanium amino-alcohol complexes exhibit improved hydrolysis-condensation properties over simple alkoxides, allowing for better control in the sol-gel reaction due to its "caged" structure. 391 The titanatrane complex [N(CH 2 CH 2 O) 3 Ti-O i Pr] reacts with water and forms hydroxyl titanium chelate [N(CH 2 CH 2 O) 3 Ti-OH], which is stable in water for an extended period of time. 432a Since the only -OH group is in the complex and no -OH moiety is present in its dimer [N(CH 2 CH 2 O) 3 Ti-O-TiN(CH 2 CH 2 O) 3 ], rutile nucleates without forming anatase.…”

Section: Crystallization From Inorganic Titanium Precursorsmentioning

confidence: 99%

Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor chemistry to nucleation process

2014

View full text Add to dashboard Cite

Nanocrystalline titania are a robust candidate for various functional applications owing to its non-toxicity, cheap availability, ease of preparation and exceptional photochemical as well as thermal stability. The uniqueness in each lattice structure of titania leads to multifaceted physico-chemical and opto-electronic properties, which yield different functionalities and thus influence their performances in various green energy applications. The high temperature treatment for crystallizing titania triggers inevitable particle growth and the destruction of delicate nanostructural features. Thus, the preparation of crystalline titania with tunable phase/particle size/morphology at low to moderate temperatures using a solution-based approach has paved the way for further exciting areas of research. In this focused review, titania synthesis from hydrothermal/solvothermal method, conventional sol-gel method and sol-gel-assisted method via ultrasonication, photoillumination and ILs, thermolysis and microemulsion routes are discussed. These wet chemical methods have broader visibility, since multiple reaction parameters, such as precursor chemistry, surfactants, chelating agents, solvents, mineralizer, pH of the solution, aging time, reaction temperature/time, inorganic electrolytes, can be easily manipulated to tune the final physical structure. This review sheds light on the stabilization/phase transformation pathways of titania polymorphs like anatase, rutile, brookite and TiO2(B) under a variety of reaction conditions. The driving force for crystallization arising from complex species in solution coupled with pH of the solution and ion species facilitating the orientation of octahedral resulting in a crystalline phase are reviewed in detail. In addition to titanium halide/alkoxide, the nucleation of titania from other precursors like peroxo and layered titanates are also discussed. The non-aqueous route and ball milling-induced titania transformation is briefly outlined; moreover, the lacunae in understanding the concepts and future prospects in this exciting field are suggested.

show abstract

“…The TB-type potassium tantalate K 6 30 reached 93% under UV irradiation for 120 min. The photocatalysis not only destroyed the chromophore of ARG but also decomposed its benzene ring and naphthalene ring partly.…”

Section: Discussionmentioning

confidence: 99%

“…[18,29] Some new bands appeared in the spectrum of the recovered catalyst after the photocatalytic reaction around 2920 cm 1 . The band at 2970-2860 cm 1 represented the CH 2 or CH 3 stretch, [30] which might be due to the formation of intermediates adsorbed on the surface of the catalysts.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Potassium Tantalate K₆Ta_10.8O₃₀ with Tungsten Bronze Structure and Its Photocatalytic Property

Wang

Xiao

et al. 2017

Chin. J. Chem.

View full text Add to dashboard Cite

With the tunable and flexible physicochemical properties, tantalate photocatalysts with tungsten bronze structure are worth being studied. In this work, we successfully synthesized a novel potassium tantalate K6Ta10.8O30 with tungsten bronze structure using a facile solid‐state reaction route. The effects of calcination time on the phase composition, morphology and crystallinity of the obtained samples were studied by XRD and SEM analyses. In addition, the photocatalytic activity of the samples was evaluated by the degradation of ARG dye under UV light irradiation. The results indicated that the K6Ta10.8O30 showed high photocatalytic activity for degradation of ARG and the photocatalytic degradation of ARG followed the first order kinetics. Furthermore, the possible photocatalytic mechanism of the K6Ta10.8O30 photocatalyst was proposed based on tungsten bronze structure feature and the scavengers experimental results. This study would give a new insight into tantalate photocatalysts.

show abstract

Synthesis and Characterization of Rutile Nanocrystals Prepared in Aqueous Media at Low Temperature

Cited by 15 publications

References 68 publications

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor chemistry to nucleation process

Potassium Tantalate K₆Ta_10.8O₃₀ with Tungsten Bronze Structure and Its Photocatalytic Property

Contact Info

Product

Resources

About

Synthesis and Characterization of Rutile Nanocrystals Prepared in Aqueous Media at Low Temperature

Cited by 15 publications

References 68 publications

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

Submicron-sized mesoporous anatase TiO2 beads with a high specific surface synthesized by controlling reaction conditions for high-performance Li-batteries

Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor chemistry to nucleation process

Potassium Tantalate K6Ta10.8O30 with Tungsten Bronze Structure and Its Photocatalytic Property

Contact Info

Product

Resources

About

Potassium Tantalate K₆Ta_10.8O₃₀ with Tungsten Bronze Structure and Its Photocatalytic Property