以对苯二甲酸为配体与金属盐反应得到两个金属-有机框架材料Cd-MOF和UiO-66,通过X射线粉末衍射仪(XRD)、热分析仪(TG)以及氮气吸脱附对两种MOFs材料进行表征,测试材料的纯度、热稳定性以及多孔性。用所合成的材料进行吸附和光催化降解含氧阴离子实验。结果表明:Cd-MOF对MnO-4、Cr2O2-7和CrO2-4的吸附率分别可以达到100%、57%、62%,经过光降解后的去除率可达到100%、84%、87%,UiO-66对MnO-4、Cr2O2-7、CrO2-4的吸附率分别可以达到66%、25%、60%,经过光降解后的去除率可达到99%、40%、87%。相对于吸附能力,两种MOFs材料对含氧阴离子尤其是含Cr阴离子均表现出更好的光催化降解能力,Cd-MOF对含氧阴离子的去除率优于UiO-66。机理研究表明,在光催化降解过程中产生了活性物质·O-2和·OH,它们的产生有助于提高降解效率。
Two metal-organic framework materials,Cd-MOF and UiO-66,were obtained by reacting terephthalic acid as ligands with metal salts.The two MOFs were characterized by X-ray powder diffraction (XRD),thermal analyzer (TG) and nitrogen adsorption and desorption to test the purity,thermal stability and porosity of the materials.Adsorption and photocatalytic degradation of oxygen-containing anions were carried out with the synthesized materials.The results showed that the adsorption rates of Cd-MOF for MnO-4,Cr2O2-7 and CrO2-4 could reach 100%,57% and 62%,respectively,and the removal rates after photodegradation could reach 100%,84% and 87%,respectively.The adsorption rates of UiO-66 for MnO-4,Cr2O2-7 and CrO2-4 could reach 66%,25% and 60%,respectively,and the removal rate after photodegradation could reach 99%,40% and 87%,respectively.Compared with the adsorption capacity,the two MOFs showed better photocatalytic degradation for oxygen-containing anions,especially for Cr-containing anions,and the removal rate of Cd-MOF for oxygen-containing anions was better than that of UiO-66.Mechanistic studies indicated that active substances,O-2 and ·OH,were produced during photocatalytic degradation,and their production contributed to the efficiency of degradation.
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基金资助
国家自然科学基金(12175024)
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