中文摘要
隨著科技的發展，人類對物質的需求也就越來越高，各種礦物以及能源的供需漸漸受世人所重視。由於在通訊產品的帶動下，鋰金屬之需求量大增，由1990年的30萬磅增加為1999年的900萬磅，海水中具大量的鋰資源，如可加以有效利用將可成為提供鋰資源的重要管道，鋰錳尖晶石酸洗後製備的λ-MnO2具吸附鋰離子的特性，因此本研究針對鋰錳尖晶石合成條件與以過硫酸銨酸洗為主，分別探討酸洗、吸附與相關吸附參數。
由實驗結果可知，以Li2CO3與MnCO3為起始原料，Li/Mn莫耳比在0.5與0.6之間，煆燒溫度在600 ℃以上，以每分鐘5 ℃升溫速率，持溫4 小時可製得純相之鋰錳尖晶石，此時比表面積(600℃/0.5)為0.06 m2/g ，粒徑為22.64 A。。
煆燒溫度在600 ℃以上，Li/Mn莫耳比低於0.5會有錳氧化合物殘留，Li/Mn莫耳比高於0.6則生成Li2MnO3。
溫度低於600 ℃或持溫時間不足4 小時的樣品，皆含許多未分解之MnCO3，且MnCO3的分解會促進Li2CO3提前分解。
將Li/Mn莫耳比=0.5、煆燒溫度為700 ℃、持溫4 小時之鋰錳尖晶石，以酸洗溫度70 ℃、酸洗時間40 分鐘、濃度0.5M以上之(NH4)2S2O8所製備吸附劑之吸附效果最佳，吸附量為31.5mg/g之，鹽酸與過硫酸氨酸洗製備之吸附劑的最佳吸附量相近，但鹽酸會將錳洗出，過硫酸銨則否，因此酸洗後兩者所得吸附劑重量不同，酸洗前後可發現XRD繞射峰有些微的偏移。
本反應之吸附熱為-10.15kcal/mol，屬化學吸附，且Na離子的存在對吸附影響不大。

Abstract
With technological development, people’s demands of material become higher and the supply of mineral and energy are respected by human as well. The demanding of lithium mental has been increases a lot under the popularity of communication products. Such requirements in 1990 is 300 thousands and 90 million in 1999. There are a plenty of lithium compound in seawater. If we can successfully and effectively extract lithium from seawater, seawater would become an important way to gain lithium. λ-MnO2 which treat with acid from LiMn2O4 can uptake lithium. As a result our study observes the conditions of synthesis, acid treatment by (NH4)2S2O8, and adsorption coefficients.
Based on the experiment, the LiMn2O4 sample prepared by mixing Li2CO3 and MnCO3 with the mol ratio between 0.5~0.6 above 600℃ for 4 hours and the increasing rate 5℃/min can produce pure LiMn2O4. It’s specific area is 0.06m2/g and particle size is 22.64 A。.
We obtain manganese oxides with temperature above 600℃ and mole ratio below 0.5. When mole ratio is above 0.6 we will obtain Li2MnO3.
A great amount of manganese oxide will remain if the temperature is below 600℃and the time of duration is less than 4 hours. MnCO3 decomposing will leads Li2CO3 to decompose at lower temperature in advance.
LiMn2O4 which is heated at 700℃ with mole ratio 0.5 for 4 hours and 0.5M (NH4)2S2O8 at 70℃ for 40 minutes will produce optimum adsorbent. Each gram of adsorbent can uptake 31.5mg lithium. The amount of uptaked lithium are the same as that which is treated with HCl and (NH4)2S2O8.However, using HCl results in a relatively high Mn dissolution, but using (NH4)2S2O8 doesn’t obtain. We get less amount of adsorbent after using HCl. Besides we can observe that peak is shifting slightly before and after acid treatment.
The enthalpy for the reaction is -10.15Kcal/mol, which belongs to chemisorption. The amount of lithium absorption wouldn’t be affected by sodium ion.

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