摘要
采用溶剂热法制备了溴改性的金属有机骨架(metal organic framework,MOF),通过模拟烟气动态吸附方法对材料单质汞(Hg0)吸附性能进行研究。利用X射线衍射(XRD)、X射线光电子能谱(XPS)、综合吸附仪对晶体结构、形貌和组分进行表征。结果表明改性后晶体结构不变,比表面积、孔容下降,溴以共价键固定在材料中。改性前和改性后材料对Hg0的吸附效率都有随温度升高而增加趋势。模拟烟气反应床吸附实验证明240℃条件下,溴改性MOF 10 h内吸附效率高于95%,同等实验条件下,非改性MOF以及传统活性炭吸附剂吸附汞5 h后效率低于75%。
Bromine modified metal organic framework（MOF） was synthesized by solvothermal method for element mercury（Hg0） adsorption. The crystal structure, chemical and texture properties of the modified MOF were characterized using X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS） and N2 adsorption. Covalent bromine was detected on the surface of the modified MOF and the modification process resulted in a lower specific surface area and total pore volume than those of unmodified MOF. Hg^0 removal efficiencies increased with temperature for both modified MOF and un-modified MOF sorbent. In the dynamic adsorption experiments, which were conducted trying to mimic the flue gas condition, the bromine modified MOF showed a high Hg^0 removal efficiency of above 95% for 10 h at 240？C, while the efficiency dropped to 75% within 5 h for both unmodified MOF and traditional active carbon sorbent.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第6期2380-2385,共6页
CIESC Journal
基金
国家自然科学基金项目(51541602)~~
关键词
金属有机骨架载体
溴改性
吸附
单质汞
烟道气
metal-organic frameworks support
bromine modification
absorption
elemental mercury
flue gas
