A magnetic metal organic framework（MMOF） was synthesized and used to separate Sr^2＋ in aqueous solution. The shape and structure of prepared Fe3O4@UiO-66-NH2 were characterized, and the absorbed concentration of st...A magnetic metal organic framework（MMOF） was synthesized and used to separate Sr^2＋ in aqueous solution. The shape and structure of prepared Fe3O4@UiO-66-NH2 were characterized, and the absorbed concentration of strontium was determined through inductively coupled plasma mass spectrometry. The results indicated that Fe3O4 and UiO-66-NH2 combined through chemical bonding. The experimental adsorption results for separation of Sr^2＋ in aqueous solution indicated that the adsorption of Sr^2＋ to Fe3O4@UiO-66-NH2 increased drastically from pH 11 to pH 13. The adsorption isotherm model indicated that the adsorption of Sr^2＋ conformed to the Freundlich isotherm model（R2 = 0.9919）. The MMOF thus inherited the superior qualities of magnetic composites and metal organic frameworks, and can easily be separated under an external magnetic field. This MMOF thus has potential applications as a magnetic adsorbent for low level radionuclide （90）Sr.展开更多
通过二氧化碳(CO_(2))与环氧化物的环加成反应可以将温室气体CO_(2)转化为有价值的化工产品环状碳酸酯,因而对该反应具有高效、高选择性的催化材料的开发一直是材料和催化领域研究的热点。UiO-66(University of Oslo,UiO)作为一种具有...通过二氧化碳(CO_(2))与环氧化物的环加成反应可以将温室气体CO_(2)转化为有价值的化工产品环状碳酸酯,因而对该反应具有高效、高选择性的催化材料的开发一直是材料和催化领域研究的热点。UiO-66(University of Oslo,UiO)作为一种具有较高稳定性、较大开放性孔道的金属有机骨架材料(metal-organic framework,MOFs),在催化领域一直作为催化材料被广泛研究,但对于Lewis酸、碱催化的CO_(2)环加成反应,UiO-66通常需要在较为苛刻的反应条件下,或在离子液体类助催化剂或溶剂存在时才能展示出一定的催化效果。通过引入功能性基团、离子液体功能化、制造缺陷和与其他材料复合等手段可增加UiO-66框架的酸、碱位点含量,从而有效提高材料对CO_(2)环加成反应的催化性能。展开更多
基金financially supported by the National Natural Science Foundation of China[Grant No.20477058]by the Chinese Ministry of Science and Technology[Grant No.2014YF211000]
文摘A magnetic metal organic framework（MMOF） was synthesized and used to separate Sr^2＋ in aqueous solution. The shape and structure of prepared Fe3O4@UiO-66-NH2 were characterized, and the absorbed concentration of strontium was determined through inductively coupled plasma mass spectrometry. The results indicated that Fe3O4 and UiO-66-NH2 combined through chemical bonding. The experimental adsorption results for separation of Sr^2＋ in aqueous solution indicated that the adsorption of Sr^2＋ to Fe3O4@UiO-66-NH2 increased drastically from pH 11 to pH 13. The adsorption isotherm model indicated that the adsorption of Sr^2＋ conformed to the Freundlich isotherm model（R2 = 0.9919）. The MMOF thus inherited the superior qualities of magnetic composites and metal organic frameworks, and can easily be separated under an external magnetic field. This MMOF thus has potential applications as a magnetic adsorbent for low level radionuclide （90）Sr.
文摘通过二氧化碳(CO_(2))与环氧化物的环加成反应可以将温室气体CO_(2)转化为有价值的化工产品环状碳酸酯,因而对该反应具有高效、高选择性的催化材料的开发一直是材料和催化领域研究的热点。UiO-66(University of Oslo,UiO)作为一种具有较高稳定性、较大开放性孔道的金属有机骨架材料(metal-organic framework,MOFs),在催化领域一直作为催化材料被广泛研究,但对于Lewis酸、碱催化的CO_(2)环加成反应,UiO-66通常需要在较为苛刻的反应条件下,或在离子液体类助催化剂或溶剂存在时才能展示出一定的催化效果。通过引入功能性基团、离子液体功能化、制造缺陷和与其他材料复合等手段可增加UiO-66框架的酸、碱位点含量,从而有效提高材料对CO_(2)环加成反应的催化性能。
