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ZIF-67@NaBiO3复合催化剂活化过硫酸盐降解罗丹明B
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Catalytic Degradation of Rhodamine B by ZIF-67@NaBiO3 Composite Activated Peroxymonosulfate
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    摘要:

    通过离子交换法将类沸石咪唑骨架材料(ZIF-67)负载在NaBiO3上,成功制备了ZIF-67@NaBiO3复合催化剂并用于活化过硫酸盐(Peroxymonosulfate,PMS). 通过X射线衍射仪、扫描电子显微镜、X射线光电子能谱仪等对复合催化剂的结构、形貌和元素价态进行表征,发现ZIF-67被成功负载到了NaBiO3上. 以罗丹明B(Rhodamine B,RhB)为目标污染物,研究ZIF-67@NaBiO3活化PMS降解RhB体系中催化剂投加量、pH、过硫酸盐浓度、温度等因素对降解RhB的影响. 结果表明,当温度为20 ℃,pH=7,RhB、PMS、ZIF-67@NaBiO3的质量浓度分别为80 mg/L、600 mg/L、100 mg/L,反应30 min后,RhB的降解率大约为98%. 并且在循环4次后,RhB 30 min的降解率仍然保持在98%左右,显示该材料优越的稳定性. 淬灭实验表明,中性条件下反应过程中主要活性物质是、·OH. 由于引进了NaBiO3,反应后的材料极易分离,可供重复利用,进一步解决了有机金属框架材料回收难的问题并拓展了其在工业上的应用范围.

    Abstract:

    In this study, we report the first cobalt metal-organic framework containing zeolitic imidazolate framework (ZIF-67) immobilized on sodium bismuthate dehydrate nanoparticles to activate peroxymonosulfate (PMS), which was named ZIF-67@NaBiO3. Characterization of X-Ray Diffraction, Scanning Electron Microscope and X-Ray Photo-electron Spectroscopy were applied to explore its morphology, structure and element valence, and it was found that ZIF-67 was successfully supported on NaBiO3. We chose Rhodamine B(RhB) as the target pollutant, and then we studied the effects of the catalyst dosage, pH, PMS concentration, temperature and other factors on the degradation of RhB in the ZIF-67@NaBiO3 activated persulfate system. When the temperature is 20 ℃, pH=7, the concentrations of RhB, PMS, ZIF-67@NaBiO3 are 80 mg/L、600 mg/L and 100 mg/L, respectively, the degradation rate of Rhodamine B was as high as 98% after 30 minutes. Furthermore, the degradation rate remained around 98% after 4 circulating. Quenching experiments showed that the main oxidants in the reaction process under neutral conditions are , ?OH. In addition, due to the introduction of NaBiO3, the reacted materials are extremely easy to separate and can be reused, which further expands the industrial application range of organometallic frame materials.

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黄彬彬 ?,江丹柠 ,谢倩倩 . ZIF-67@NaBiO3复合催化剂活化过硫酸盐降解罗丹明B[J].湖南大学学报:自然科学版,2023,(6):156~163

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  • 在线发布日期: 2023-07-05
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