Селективное извлечение лития из водных растворов слоистым аморфным протонированным полититанатом калия

   В данной работе по технологически простой и дешевой методике в качестве альтернативы известным слоистым неорганическим ионообменникам марганцевого и титанатного типа получен и исследован протонированный полититанат калия (K_0,8Н_1,2Ti_4,3O_8,5) в целях извлечения лития из вторичных природных ресурсов. Методом рентгеновского фазового анализа (РФА) подтверждено сохранение исходной рентгеноаморфной структуры полититаната калия после процесса протонирования, обеспечивающей хорошую ионообменную и адсорбционную способность материала. Методом инфракрасной спектроскопии проанализированы функциональные группы протонированного полититаната калия, представляющие собой потенциальные активные центры для взаимодействия с ионами Lⁱ⁺. При извлечении лития из водного раствора с концентрацией 0,01 моль/л протонированный полититанат калия продемонстрировал равновесную адсорбционную емкость 0,52 ммоль/г. При этом экспериментальные данные хорошо согласуются с кинетической моделью псевдовторого порядка (R₂ = 0,999). Адсорбционный процесс описываются изотермой Фрейндлиха и характеризуются константой K_F = 0,0013 (л)1/n(ммоль)^1–1/n/г. Показана хорошая селективность протонированного полититаната калия по отношению к ионам Li⁺ в присутствии ионов Na⁺, K⁺, Mg²⁺ и Ca²⁺ при сохранении адсорбционной емкости на уровне 0,50…0,52 ммоль/г. Полученные результаты свидетельствуют о том, что протонированный полититанат калия является перспективным и конкурентоспособным материалом для извлечения ионов Li⁺ из водных растворов с низкой концентрацией.

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