基于对苯二甲酸的MOFs对含氧阴离子的吸附及光降解研究  

Adsorption and photodegradation of MOFs based on terephthalic acid for oxygen-containing anions

作　　者：陈悦[1] 李田甜 种仙娥 池立欣 钱俊峰[1] 张致慧[1] Chen Yue;Li Tiantian;Chong Xiane;Chi Lixin;Qian Junfeng;Zhang Zhihui(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,School of Petrochemical Engineering,Changzhou University,Changzhou 213164)

机构地区：[1]常州大学石油化工学院,江苏省绿色催化与技术重点实验室,常州213164

出　　处：《化工新型材料》2024年第7期273-278,共6页New Chemical Materials

基　　金：国家自然科学基金(12175024)。

摘　　要：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)、Cr_(2)O_(7)^(2-)和CrO_(4)^(2-)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)、Cr_(2)O_(7)^(2-)、CrO_(4)^(2-)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),Cr_(2)O_(7)^(2-) and CrO_(4)^(2-) 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),Cr_(2)O_(7)^(2-) and CrO_(4)^(2-) 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.

关 键 词：金属-有机框架材料 含氧阴离子 吸附 光催化降解 对苯二甲酸配体 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]