In order to improve the adsorption capacity and rate of lithium-ion sieves (HTiO), graphene oxide (GO) was introduced as a soft carbon material to prevent the agglomeration of LiTiO by utilizing the structural attributes of the GO carrier. The ultrafine LTO@GO lithium ion sieve (particle diameter 40 nm) was prepared by a two-step process including a sol–gel co-mixture step and a solid-state calcination step. Furthermore, LTO@GO-0.05 lithium ion sieves were identified as the optimal ratio with a high adsorption capacity of 38.3 mg·g. The crystallinity of the (-133) and (312) facets of LTO@GO-0.05 were improved to 86.62% and 74.67% by XRD analysis, indicating an improvement in the acid resistance of the structure. The hydroxyl group content in HTO@GO was 41.79% higher than 35.72% in HTO from XPS survey of HTO@GO and HTO, which is benefit to increase adsorption capacity. Next, the HTO@GO adsorption rate was investigated to reach adsorption equilibrium shortened from 24 h to 14 h compared with HTO. The results indicate that HTO@GO has good industrial potential with fast Li adsorption.

中文翻译：

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快速吸附Li+的H2TiO3@GO的制备及其吸附行为

为了提高锂离子筛（HTiO）的吸附容量和速率，引入氧化石墨烯（GO）作为软碳材料，利用GO载体的结构属性来防止LiTiO的团聚。超细LTO@GO锂离子筛（粒径40 nm）通过两步法制备，包括溶胶-凝胶共混合步骤和固态煅烧步骤。此外，确定LTO@GO-0.05锂离子筛为最佳配比，其吸附容量高达38.3 mg·g。通过XRD分析，LTO@GO-0.05的(-133)和(312)晶面结晶度分别提高至86.62%和74.67%，表明结构的耐酸性得到改善。通过XPS对HTO@GO和HTO的测量发现HTO@GO中的羟基含量比HTO中的35.72%高出41.79%，这有利于提高吸附容量。接下来，研究了HTO@GO的吸附速率，与HTO相比，达到吸附平衡的时间从24小时缩短到14小时。结果表明，HTO@GO具有快速的Li吸附能力，具有良好的工业潜力。