无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (12): 59-65.doi: 10.19964/j.issn.1006-4990.2022-0703

• 研究与开发 • 上一篇    下一篇

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

崔香梅1(), 潘彤彤1, 罗清龙2,3,4, 边富璇1, 叶秀深2,3,4()   

  1. 1.青海大学,青海 西宁 810016
    2.中国科学院青海盐湖研究所,青海 西宁 810008
    3.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
    4.青海省盐湖资源化学重点实验室,青海 西宁 810008
  • 收稿日期:2022-11-30 出版日期:2023-12-10 发布日期:2023-12-14
  • 通讯作者: 叶秀深(1981— ),男,博士,研究员,研究方向为盐湖资源综合利用;E-mail:yexs@isl.ac.cn
  • 作者简介:崔香梅(1980— ),女,博士,副教授,研究方向为盐湖稀有元素分离材料与技术,E-mail:cuixiangmei@qhu.edu.cn
  • 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

CUI Xiangmei1(), PAN Tongtong1, LUO Qinglong2,3,4, BIAN Fuxuan1, YE Xiushen2,3,4()   

  1. 1. Qinghai University,Xining 810016,China
    2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Xining 810008,China
    3. Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China
    4. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining 810008,China
  • Received:2022-11-30 Published:2023-12-10 Online:2023-12-14

摘要:

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。

关键词: 硼吸附剂, 氧化石墨烯, 碳纳米管, 卤水, 复合气凝胶, 氨基醇

Abstract:

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.

Key words: boron adsorbent, graphene oxide, carbon nanotube, brine, composite aerogel, amino alcohol modification

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