| 无机锰吸附材料的制备及其锂离子的吸附性能 |
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| 引用本文： | 岳德宇,张蕾,徐占武,程鹏高,唐娜. 无机锰吸附材料的制备及其锂离子的吸附性能[J]. 无机盐工业, 2014, 46(8): 21 |
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| 作者姓名： | 岳德宇 张蕾 徐占武 程鹏高 唐娜 |
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| 作者单位： | 1.天津科技大学海洋科学与工程学院，天津 300457；2.天津海洋资源与化学重点实验室；3.天津长芦海晶集团有限公司 |
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| 基金项目： | 天津市滨海新区科技小巨人成长计划资助项目(2011-XJR13020) |
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| 摘 要： | 以氢氧化锂为原料，通过控制无机锰吸附材料合成反应条件制备了尖晶石型的LiMn2O4离子筛前驱体，经酸浸脱锂后获得对Li+具有特殊选择性吸附的尖晶石型离子筛。对无机锰吸附材料进行了XRD、SEM、BET表征，测定了离子筛对纯锂溶液和卤水中锂的吸附容量。结果表明，当离子筛制备体系的原料锂锰物质的比为0.5、800 ℃下反应15 h时，产品为近纯尖晶石型晶体，且具有较大比表面积。吸附实验表明，该离子筛在碱性含锂溶液中对Li+具有吸附性能，且吸附容量随着溶液pH和温度的升高而增大，在pH=13的纯锂溶液中最大吸附量可达32.251 mg/g，并在30 h达到吸附平衡。该吸附材料循环利用8次后，吸附量保持在18 mg/g以上，在西藏龙木错卤水中，对锂的吸附量达到11.273 mg/g。吸附过程符合伪二级动力学，表明吸附过程主要为化学吸附，且离子交换反应的控制步骤是颗粒扩散控制（PDC）。
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| 关 键 词： | 离子筛 锂离子 吸附 尖晶石 |
Preparation and Li+ adsorption properties of inorganic manganese adsorption material |
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| YUE De-Yu,ZHANG Lei,XU Zhan-Wu,CHENG Peng-Gao,TANG Na. Preparation and Li+ adsorption properties of inorganic manganese adsorption material[J]. Inorganic Chemicals Industry, 2014, 46(8): 21 |
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| Authors: | YUE De-Yu ZHANG Lei XU Zhan-Wu CHENG Peng-Gao TANG Na |
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| Affiliation: | 1.College of Marine Science & Engineering，Tianjin University of Science & Technology，Tianjin 300457，China；2.Tianjin Key Laboratory of Sea Water and Chemistry；3.Tianjin Changlu Haijing Group Co.，Ltd. |
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| Abstract: | Spinel-type precursor LiMn2O4 ion sieve was synthesized with LiOH·H2O and MnCO3 as raw materials via controlling reaction conditions of inorganic manganese adsorption material.The final spinel-type ion sieve with higher Li+ selective adsorption property was prepared and further modified by acid treatment to extract lithium ions completely.Inorganic manganese adsorption materials were characterized by XRD，SEM，and BET，and adsorption capacities of ion sieve to lithium in pure lithium solution and brine were determined.Results showed that the precursors were closed to pure spinel-type crystals and had high specific surface area when the amount-of-substance ratio of lithium to manganese was 0.5 and reaction was at 800 ℃ for 15 h.The adsorption experiment showed that the ion-sieve could adsorb Li+ in alkaline solution and the exchange capacity of the ion-sieve was enhanced with the increasing of pH and temperature， its maximum capacity reached 32.251 mg/g when pH was 13 in LiOH solution and the time of adsorption equilibrium was 30 h.After being reused 8 times，the adsorption amount maintained at 18 mg/g or more and the lithium adsorption amount in Tibet Longmucuo brine reached 11.273 mg/g. The adsorption process was found to fit pseudo-second-order kinetic equation，so the adsorption process was determined to be chemical adsorption and the kinetics controlled step of adsorbent with Li+ was determined to be particle diffusion control （PDC）. |
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| Keywords: | ion sieve lithium ion adsorption spinel-type |
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