金属-有机骨架负载磷钼酸处理漂白废水中AOX的研究

Study on the Treatment of AOX in Bleaching Wastewater by Metal Organic Framework Supported Phosphomolybdic Acid

关键词:  磷钼酸  金属有机骨架  过氧化氢  可吸附有机卤化物（AOX）  废水处理

Key Words:phosphomolybdic acid  metal organic framework  hydrogen peroxide  adsorbable organic halides（AOX）  wastewater treatment

摘要:利用锆系金属有机骨架（UiO-66）负载磷钼酸（PMA）制备负载型催化剂（PMA@UiO-66），通过傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）、比表面积和孔径分析仪（BET）、扫描电子显微镜（SEM）、热重分析仪（TG）、X射线光电子能谱仪（XPS）等手段对其结构进行了表征；分析了在H₂O₂的氧化作用下，负载型催化剂PMA@UiO-66对制浆漂白废水中可吸附有机卤化物（AOX）的去除效果，并研究了PMA@UiO-66的回用及其稳定性。结果表明，PMA成功负载在金属骨架上，且不会影响金属骨架UiO-66的晶体结构，PMA@UiO-66具有大的比表面积和孔径，有利于污染物进入活性位点；在PMA@UiO-66/H₂O₂的作用下，漂白废水中AOX和总有机碳（TOC）的去除率分别可达55.7%和60.0%；PMA@UiO-66具有良好的回用性和稳定性，循环4次之后AOX的去除率为51.8%且反应前后PMA@UiO-66的结构未发生变化。

Abstract:The supported catalyst （PMA@UiO-66） was prepared by encapsulating phosphomolybdic acid （PMA） with zirconium metal organic framework （UiO-66） and its structure was characterized by FT-IR， XRD， BET， SEM， TG， XPS and other means.The degradation of pulping and bleaching wastewater by PMA@UiO-66 under H₂O₂ action was analyzed and adsorbable organic halides（AOX） changes in wastewater were discussed. The recycle and stability of supported catalyst were studied.The results showed that the PMA was successfully loaded on the metal skeleton， which did not destroy the UiO-66 crystal structure of the metal skeleton. The supported catalyst had large specific surface area and pore size， which was conductive to the entry of pollutants into the active site. Under the action of PMA@UiO-66/H₂O₂， the removal rate of AOX and TOC in bleaching wastewater could reach 55.7% and 60.0%， respectively.Supported catalyst PMA@UiO-66 showed good reuse and stability， after four cycles， its removal rate towards AOX could till reach to 51.8%， and the structure of PMA@UiO-66 did not change before and after the reaction.