Zhang Li-Yuan, Liu Yi-Wu, Huang Lan, Li Ning
College of Chemistry and Chemical Engineering, Neijiang Normal University Neijiang 641112 China
Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial College Neijiang 641112 China.
RSC Adv. 2018 Jan 3;8(3):1385-1391. doi: 10.1039/c7ra11430c. eCollection 2018 Jan 2.
A peroxy lithium titanate sol was prepared with low-cost and easily available titanyl sulfate as the titanium source, lithium acetate as the lithium source, and aquae hydrogenii dioxidi as the complexing agent using an inorganic precipitation-peptization method. The sol system was aged, centrifugal-washed, dried and calcined to obtain a pure precursor, LiTiO, followed by pickling with hydrochloric acid to obtain the HTiO-lithium adsorbent. The effects of aging time and calcination temperature on the target product were investigated. The results indicate that the sol-system is stable, which is beneficial for loading on a suitable carrier, such as ceramic foams. Centrifugal-washing, instead of vacuum filtration-washing, is conducive to product formation. The most suitable aging time of precursor sol is 24 h and the appropriate calcination temperature is 750 °C. The lithium drawn-out ratio of samples synthesized in this condition reaches 89.50% after pickling with 0.2 M hydrochloric acid for 8 h at 70 °C. Moreover, the Li uptake of the adsorbent (adsorption capacity) reaches 29.96 mg g and 33.35 mg g when the adsorption time is 1 h and 8 h, respectively.
以低成本且易于获得的硫酸氧钛为钛源、醋酸锂为锂源、过氧化氢为络合剂，采用无机沉淀-胶溶法制备了过氧钛酸锂溶胶。将溶胶体系进行陈化、离心洗涤、干燥和煅烧，得到纯前驱体LiTiO，然后用盐酸酸洗得到HTiO锂吸附剂。研究了陈化时间和煅烧温度对目标产物的影响。结果表明，溶胶体系稳定，有利于负载在合适的载体上，如泡沫陶瓷。采用离心洗涤而非真空抽滤洗涤有利于产物形成。前驱体溶胶最适宜的陈化时间为24 h，合适的煅烧温度为750℃。在此条件下合成的样品经0.2 M盐酸在70℃酸洗8 h后，锂提取率达到89.50%。此外，当吸附时间分别为1 h和8 h时，吸附剂的锂吸附量（吸附容量）分别达到29.96 mg/g和33.35 mg/g。
