摘要
氨气是一种有毒气体,排放到空气中会对人类和环境造成不可估量的危害,制备廉价、绿色的氨气吸附材料对于氨气处理具有重要意义。本研究采用低成本的8-羟基喹啉-5-磺酸(H_(2)QS)作为配体,通过简单的低温水热法合成了La^(3+)基金属有机框架{[La_(4)(QS)_(6)(H_(2)O)_(6)]·18H_(2)O}n(MOF‑LaQS)。实验结果显示,MOF‑LaQS在273 K、101 kPa条件下对氨气的最大吸附量可达228 cm^(3)·g^(-1)(10.2 mmol·g^(-1)),且在极低压力(0.101 kPa)下仍能吸附48 cm^(3)·g^(-1)(2.14 mmol·g^(-1))的氨气。通过原位红外光谱和密度泛函理论计算证实了MOF‑LaQS中开放的La^(3+)金属位点是吸附氨气的关键位点,揭示了其高效吸附氨气的机理。
Ammonia,a toxic gas,poses significant risks to human health and the environment.Developing cost-effective and eco-friendly adsorbents for ammonia capture is crucial.In this study,a La^(3+)-based metal-organic frame-work{[La_(4)(QS)_(6)(H_(2)O)_(6)]·18H_(2)O}n(MOF‑LaQS)was synthesized via a simple low-temperature hydrothermal method using inexpensive 8-hydroxyquinoline-5-sulfonic acid(H_(2)QS)as organic ligand.The material exhibited structural stability,low synthesis costs,and exceptional ammonia adsorption capacities of 228 cm^(3)·g^(-1)(10.2 mmol·g^(-1))at 273 K(101 kPa)and 48 cm^(3)·g^(-1)(2.14 mmol·g^(-1))at ultra-low pressure(0.101 kPa).In situ infrared spectroscopy and DFT calculations revealed that open La^(3+)sites are key to its ammonia adsorption,thereby elucidating the mecha-nism underlying its high ammonia uptake.CCDC:2479883.
作者
李平
谭庚
黄鑫
孙福兴
贾江涛
朱广山
刘佳
李激扬
LI Ping;TAN Geng;HUANG Xin;SUN Fuxing;JIA Jiangtao;ZHU Guangshan;LIU Jia;LI Jiyang(College of Chemistry,Jilin University,Changchun 130012,China;Faculty of Chemistry,Northeast Normal University,Changchun 130024,China)
出处
《无机化学学报》
北大核心
2025年第10期2063-2068,共6页
Chinese Journal of Inorganic Chemistry
基金
中央高校基本科研业务研究基金(No.2412024QD012)资助。
关键词
氨气捕获
金属有机框架
开放式金属位点
水热合成
ammonia capture
metal organic framework
open metal site
hydrothermal synthesis
