Preparation of nano-titanium dioxide from ilmenite using sulfuric acid-decomposition by liquid phase method

Li, Zenghe; Wang, Zhencui; Li, Ge

doi:10.1016/j.powtec.2015.09.008

Cited by 49 publications

(30 citation statements)

References 16 publications

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Section: Structure Of Prepared Supportsmentioning

confidence: 99%

“…The micrographs of BFS-TiO 2 samples with pH adjustment were very similar and represented by sample prepared at pH 1; their SEM showed the asymmetric plate-like morphology with larger, more consolidated agglomerates, thus exposing new textural properties (see Figure 1) in comparison to sample without pH adjustment in hydrolysis. The severe agglomeration observed in samples having pH adjustment is probably because the strong acidity of the initial hydrolysis solution caused slow hydrolyzation; the enhancement in the hydrolytic pH value might have helped to increase in reaction rate that led to increase the number of particles and, consequently, the number of collisions leading to agglomeration [21,36,37].…”

Section: Structure Of Prepared Supportsmentioning

confidence: 99%

“…TEM analysis revealed that the synthetic BFS-TiO 2 supports had obviously spherical primary particles without any coating on the surface [21]. A high resolution transmission electron microscopic (HRTEM) study was performed to clarify the distribution of crystalline titania within the BFS- In order to further understand the structure of BFS-TiO2 from hydrolysis under different pH values, FT-IR (Fourier Transform Infrared Spectroscopy) spectra were taken for all tested supports ( Figure 3).…”

Section: Structure Of Prepared Supportsmentioning

confidence: 99%

“…Studies on ilmenite leaching with sulfuric acid clarified that the maximal dissolution rate of ilmenite occurs at 70-76 wt. % H2SO4 at 88-100 °C [21,22]. The leaching was thus conducted using 70 wt.…”

Section: Slag Treatment and Catalyst Preparationmentioning

confidence: 99%

“…The latter are currently used to produce TiO 2 support for SCR deNO x catalyst through sulfate method [21], where the ilmenite ore is dissolved in concentrated sulfuric acid solution to prepare a titanium sulfate solution (TiOSO 4 ). This solution is further purified and hydrolyzed to produce pure TiO 2 [21,22]. In China, only 25% of Ti-bearing BFS is used to make dam concrete or road-paving material.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

Tran

Gan

et al. 2016

Catalysts

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Abstract:The study is devoted to developing a rather high-efficiency NH 3 -SCR (selective catalytic reduction) catalyst for NO x removal using TiO 2 -SiO 2 support made from blast furnace slag. Through adjusting hydrolytic pH value of TiOSO 4 solution obtained from acidolysis of slag with 70 wt. % H 2 SO 4 , a series of TiO 2 -SiO 2 mixed oxides was prepared to have different mass ratios of TiO 2 to SiO 2 . The supports are further impregnated with V 2 O 5 and WO 3 to make the SCR catalysts for NO x removal. Characterizing the catalysts show that silica and unavoidable impurities in support prepared from slag were responsible for maintaining their mesoporous structure and the enhancements in the acidity and reducible form of active species on the catalyst surface, which thus rendered the catalysts to have higher NO x reduction capability than catalyst using commercial TiO 2 . Furthermore, the low-cost catalyst prepared from slag-based TiO 2 support possesses good stability, and strong resistance to SO 2 and H 2 O poisoning, which are beneficial to practical deNO x applications.

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Section: Structure Of Prepared Supportsmentioning

confidence: 99%

Section: Structure Of Prepared Supportsmentioning

confidence: 99%

Section: Structure Of Prepared Supportsmentioning

confidence: 99%

Section: Slag Treatment and Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

Tran

Gan

et al. 2016

Catalysts

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Visible Light Active Silver Decorated Iron Titanate/Titanium Dioxide Nanohybrid for Sterilization of Explants Grown by In Vitro Technique

Seneviratne

Munaweera

Peiris

et al. 2022

Adv Materials Technologies

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Visible light (VL) active silver decorated iron titanate/titanium dioxide (Ag‐FeTiO3/TiO2) nanohybrids derived from natural ilmenite sand effectively cleanse the exophytic plant pathogens in explants grown by in vitro techniques. VL active nanohybrid is synthesized by acid‐hydrolysis of natural ilmenite, followed by precipitation of the lixivium and decoration with Ag onto FeTiO3/TiO2 nanoparticles, and finally calcination under a nitrogen environment to obtain Ag‐FeTiO3/TiO2. A morphological study conducted using transmission electron microscopy (TEM) confirms the formation of Ag‐FeTiO3/TiO2. Powder X‐ray diffraction (PXRD) analysis shows that the nanohybrid primarily consists of anatase, iron titanate (FeTiO3), Ag2O, and Ag. X‐ray photoelectron spectroscopy (XPS) study suggests the presence of Ag0/Ag2O/Fe2O3 composites on the FeTiO3/TiO2 particle surface. The optical band gap significantly changes from 3.14 eV (ilmenite) to 2.80 eV after the decoration of FeTiO3/TiO2 with Ag. This nanohybrid is utilized as a surface‐sterilizing agent for in vitro establishment of the Dracaena sanderiana Sander ex Mast plant. Findings illustrate Ag‐FeTiO3/TiO2 nanohybrid‐based photo‐sterilization leads to the survival of 90% of the microbes’ free cultures while the material can be re‐used due to its photocatalytic behavior. Thus, the newly synthesized nanohybrid can replace harmful sterilization agents used in tissue culture techniques.

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Tuning anatase to rutile ratio in nanocrystalline titania enriched from sustainable beach sand from Cox's Bazar, Bangladesh

Roy

Bashar

Tofail

et al. 2023

Surface & Interface Analysis

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A sustainable source of titania (TiO 2 ) is important in applications of photovoltaic devices, photocatalysts, sensors, and so forth. Beach sand from Cox's Bazar, Bangladesh, can be an excellent sustainable source of this titania as almost a quarter of it contains titania in the form of rutile and ilmenite. This study demonstrates the success of a sulfuric acid-based hydrometallurgical process in enriching titania in Cox's Bazar beach sand. The route produces precursors that can be conveniently calcined into nanocrystalline phase-pure anatase or anatase/rutile composites. We used both bulk and surface characterization to determine phase purity, crystallite size as well as surface chemistry, and morphology of the resulting anatase and rutile/anatase mixture. The proportion of anatase/rutile can be tuned by varying digestion times. This hydrometallurgical route can potentially lead to the scalable production of precursors used in producing high-performance nanocrystalline titania from a sustainable source of beach sand from Cox's Bazar of Bangladesh.

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Preparation of nano-titanium dioxide from ilmenite using sulfuric acid-decomposition by liquid phase method

Cited by 49 publications

References 16 publications

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

Upgrading V2O5-WO3/TiO2 deNOx Catalyst with TiO2-SiO2 Support Prepared from Ti-Bearing Blast Furnace Slag

Visible Light Active Silver Decorated Iron Titanate/Titanium Dioxide Nanohybrid for Sterilization of Explants Grown by In Vitro Technique

Tuning anatase to rutile ratio in nanocrystalline titania enriched from sustainable beach sand from Cox's Bazar, Bangladesh

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