Xiaojuan Wang

Publications (2)1.3 Total impact

• Article: Hydrogen peroxide leaching of hydrolyzed titania residue prepared from mechanically activated Panzhihua ilmenite leached by hydrochloric acid

  Feixiang Wu, Xinhai Li, Zhixing Wang, Ling Wu, Huajun Guo, Xunhui Xiong, Xiaoping Zhang, Xiaojuan Wang
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  ABSTRACT: The hydrolyzed titania residue with mainly precipitated hydrated TiO2 is prepared from mechanically activated Panzhihua ilmenite leached by hydrochloric acid. We use H2O2 as a coordination agent to leach Ti from the hydrolyzed titania residue. The effects of H2O2 to-hydrolyzed titania residue mass ratio, leaching pH value, leaching temperature, leaching time, and H2O2 concentration on leaching of hydrolyzed titania residue by H2O2 are investigated. The recovery of Ti is above 98% under the optimal conditions. XRD shows that the peroxo-titania powder prepared by boiling the aqueous titanium peroxide solution is crystalline anatase phase. A well-crystallized anatase TiO2 and rutile TiO2 can be obtained through calcining at the temperature of 800 and 1000 °C, respectively. EDS shows that the impurities including silicon are enriched in the leaching slag. Little Si is detected as the only impurity in the synthetic TiO2 due to the weak alkaline condition of leaching.Research Highlights► We introduce a novel method to leach Ti from the hydrolyzed titania residue.► Anatase TiO2 only with impurity of little Si can be easily obtained by this method. ► This method is a simple, efficient, economical, and environment-friendly way for both ilmenite utilization and materials preparation.
  International Journal of Mineral Processing 98:106-112. · 1.30 Impact Factor
• Article: Preparation of TiO2 nanosheets and Li4Ti5O12 anode material from natural ilmenite

  Feixiang Wu, Xinhai Li, Zhixing Wang, Huajun Guo, Ling Wu, Xunhui Xiong, Xiaojuan Wang
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  ABSTRACT: We demonstrate a simple, improved and novel approach for the synthesis of a kind of anatase TiO2 nanosheets and Li4Ti5O12 anode material with excellent electrochemical performance from the natural ilmenite. We use the H2O2 to leach the Ti from the hydrolyzed titania residue under alkaline condition of leaching. Before boiling, the LiOH was added into the leach solution. The obtained precipitation of titanium dioxide hydrate can be purified and refined into special nanostructure by the addition of LiOH. SEM and XRD show that the as-prepared TiO2 are special nanostructure and well-crystallized anatase phase. The analysis of elemental contents reveals that the content percent of TiO2 in as-prepared TiO2 nanosheets is more than 99%. Moreover, the titanium dioxide hydrate can be used to prepare Li4Ti5O12 anode material directly. The obtained Li4Ti5O12 shows charge specific capacities of 161,138 and 113 mA hg− 1 at 0.1C, 0.5C and 1C rates, respectively, and excellent cycling stability.Graphical abstractThe TiO2 nanosheets and Li4Ti5O12 anode material are prepared from ilmenite. SEM image (Fig. a) shows that the as-prepared TiO2 is petal-shaped nanosheet. From the charge and discharge curves (Fig. b), the as-prepared Li4Ti5O12 shows a capacity of 161, 138 and 112 mA hg− 1 at 0.1C, 0.5C and 1C rate, respectively.Highlights► We propose a novel approach for the synthesis of TiO2 and Li4Ti5O12 from ilmenite. ► The anatase TiO2 nanosheets have a special nanostructure and show great value. ► The as-prepared Li4Ti5O12 shows excellent electrochemical performance.
  Powder Technology. 213:192-198.