Study on H₂TiO₃-lithium Exchanger Synthesized by Precipitation-peptization Method

A novel inorganic precipitation-peptization method was proposed to synthesize Li₂TiO₃ in this work.TiOSO₄ and CH3COOLi were employed as lithium and titanium sources respectively,and H₂O₂ was used as complexing agent resulted in titanium-lithium sol system via precipitation-peptization method,and then H₂TiO₃-lithium adsorbent was obtained by drying,calcining,treating with hydrochloric acid successively. The effects of preparation conditions on the stability of the sol system,the morphology and properties of the xerogel and Li₂TiO₃ were investigated by FTIR,TG-DSC,XRD,SEM,ICP,Zetasizer Nano and rotary viscosimeter. The research results indicated that a stable sol system with viscosity 7.3 m Pa·s and the Zeta potentials（-29.5m V） could be prepared after aged 24 hours under the conditions of using CH₃COOLi as lithium source,the value of pH about 7,Ti₄⁺ concentration 0.2 mol/L. The complex peroxide exist in this system can be proved through analyzing the bonding of the xerogel by infrared spectrum. Better calcining temperature and time of the dry gel was 750 ℃,2 h respectively,and β-Li₂TiO₃ was obtained under this condition. β-Li₂TiO₃ was further treated with hydrochloric acid （0.2 mol/L） to obtain H₂TiO₃-lithium absorbent,and finally the Li+drawn out ratio from β-Li₂TiO₃ reaches 85.31%,the adsorption capacity comes up to 27.15 mg/g.