氨基醇改性GO/CNTs复合气凝胶的制备及对盐湖卤水硼的吸附
收稿日期: 2022-11-30
网络出版日期: 2023-12-14
基金资助
青海省应用基础研究计划项目(2019-ZJ-7044);国家自然科学基金联合基金项目(U21A20305)
Preparation of amino alcohol modified GO/CNTs composite aerogel and boron adsorption from salt lake brines
Received date: 2022-11-30
Online published: 2023-12-14
分离和提取盐湖卤水中的低浓度硼，可提高资源综合利用率，亦有利于解决盐湖下游产品的硼杂质干扰问题。采用水热法合成氧化石墨烯/碳纳米管（GO/CNTs）复合气凝胶，通过环氧开环反应将多羟基的2-氨基-1，3-丙二醇接枝到气凝胶表面，得到氨基醇改性的氧化石墨烯/碳纳米管（GO/CNTs）气凝胶硼吸附剂，采用FT-IR、XPS和SEM对硼吸附剂形貌结构等进行表征分析。考察pH、初始浓度、温度和接触时间等因素对硼吸附的影响，研究发现，吸附剂在孔道内和表面均具有丰富多元醇基团的多孔结构，pH=10、硼初始质量浓度C0=1 200 mg/L时对硼最大平衡吸附量达到43.42 mg/g，在35 ℃下吸附硼性能最佳，60 min内可达饱和吸附平衡，吸附过程符合准二阶动力学模型。吸附机理为硼与多羟基之间的化学络合作用。该吸附剂在卤水中硼的分离方面展现出良好的应用价值和潜力。
崔香梅 , 潘彤彤 , 罗清龙 , 边富璇 , 叶秀深 . 氨基醇改性GO/CNTs复合气凝胶的制备及对盐湖卤水硼的吸附[J]. 无机盐工业, 2023 , 55(12) : 59 -65 . DOI: 10.19964/j.issn.1006-4990.2022-0703
The separation and extraction of low concentration boron from salt lake brine can not only improve the comprehensive utilization rate of resources，but also solve the problem of boron impurity interference in the downstream products of salt lake.Graphene oxide/carbon nanotube（GO/CNTs） composite aerogel was synthesized by hydrothermal method.Polyhydroxy 2-amino-1，3-propanediol was grafted onto the surface of the aerogel by epoxy ring-opening reaction to obtain amino alcohol modified graphene oxide/carbon nanotubes（GO/CNTs） aerogel gel boron adsorbent.The effects of pH，initial concentration，temperature and contact time on boron adsorption were studied by FT-IR，XPS and SEM.It was found that the adsorbent was a porous structure with abundant polyol groups in the channel and on the surface.The results also showed that the maximum equilibrium adsorption capacity of boron was 43.42 mg/g at pH=10，Co=1 200 mg/L.The adsorption performance of boron was the best at 35 ℃ and reached saturated adsorption equilibrium within 60 min.The adsorption process was accorded with quasi-second-order kinetic model.The adsorption mechanism was the chemical complexation between boron and polyhydroxyl groups.According to the research，the adsorbent showed good application value and potential in the separation of boron in brine.
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