| 新型复合生物质锂吸附剂的制备及吸附性能研究 |
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| 引用本文： | 刘海宁,丁冬,李可昕,罗清龙,叶秀深.新型复合生物质锂吸附剂的制备及吸附性能研究[J].盐湖研究,2023,31(1):77-86. |
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| 作者姓名： | 刘海宁 丁冬 李可昕 罗清龙 叶秀深 |
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| 作者单位： | 中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖资源化学重点实验室,青海 西宁 810008;中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖资源化学重点实验室,青海 西宁 810008;中国科学院大学,北京 100049 |
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| 基金项目： | 青海省应用基础研究(2019-ZJ-7014) ; 国家自然科学基金联合基金( U21A20305) |
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| 摘 要： | 以KMnO4、苯胺、LiOH和生物质碳气凝胶(BCA)为原料,通过水热沉积法得到了锰酸锂(LMO)负载的生物质碳气凝胶(BCA@LMO),并用HCl酸洗后得到了BCA@HMO复合锂吸附剂。利用IR、XRD、XPS、SEM、EDS、Mapping、BET等手段对其结构进行了表征。考察了pH值、离子强度、初始浓度、温度和吸附时间对锂吸附的影响。结果表明,复合吸附剂为介孔结构,其孔道内和表面具有丰富的锰酸锂颗粒,Li+的最大平衡吸附量在pH=12时为4.07 mmol·g-1,吸附过程符合Langmuir等温线和准二阶动力学模型,升高温度和碱性环境利于Li+的吸附。吸附机理为H+与Li+的离子交换。复合吸附剂较好地改善了锰系锂吸附剂固液分离困难的问题,该吸附剂在实际南翼山盐田和东台吉乃尔盐田卤水(2.92 mmol·g-1)中具有良好的吸附性能。因此,该吸附剂在卤水锂的分离中具有良好的应用价值和潜力。
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| 关 键 词： | 生物质吸附剂 锂 吸附 卤水 |
| 收稿时间： | 2021/7/13 0:00:00 |
| 修稿时间： | 2021/8/18 0:00:00 |
Study on the Preparation and Adsorption Properties of A Novel Composite Biomass Carbonaceous Adsorbent for Li+ |
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| LIU Hai-ning,DING Dong,LI Ke-xin,LUO Qing-long,YE Xiu-shen.Study on the Preparation and Adsorption Properties of A Novel Composite Biomass Carbonaceous Adsorbent for Li+[J].Journal of Salt Lake Research,2023,31(1):77-86. |
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| Authors: | LIU Hai-ning DING Dong LI Ke-xin LUO Qing-long YE Xiu-shen |
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| Institution: | Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences;China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province;China;University of Chinese Academy of Sciences;China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences |
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| Abstract: | A composite adsorbent named BCA@HMO was synthesized by modifying BCA with potassium permanganate, aniline, lithium hydroxide, and biomass carbon aerogel through a hydrothermal deposition method. The composite adsorbent were characterized by IR, XRD, XPS, SEM, Mapping, EDS and BET. The adsorption isotherm, kinetics, the effects of pH, temperature, initial lithium concentration, and the ionic strength on lithium adsorption were studied. The results show that the adsorbent has mesoporous structure and on the surface abound polyhedron particles which main component is proved to be lithium manganate. The maximum equilibrium adsorption capacity was 2.92 mmol g-1. The adsorption isotherm and adsorption kinetics were best fitted with the Langmuir model and pseudo-second-order rate equation, respectively. The increase of temperature and alkaline environment are beneficial to the adsorption of Li+. The adsorption performed through the ion-exchange between H+ and Li+. The composite adsorbent can improve the difficulty of solid-liquid separation of manganese lithium adsorbent. The adsorbent has good adsorption capacity in the brine of real Nanyishan salt field and East Taigener salt field (2.92 mmol g-1). Therefore, the adsorbent has good application value and potential in the separation of lithium brine. |
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| Keywords: | Biomass carbonaceous adsorbent Lithium Adsorption Salt lake brine |
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