Fast and Facile Synthesis of Cobalt-Doped ZIF-8 and Fe3O4/MCC/Cobalt-Doped ZIF-8 for the Photodegradation of Organic Dyes under Visible Light

IF 3.7 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Amin Mehrehjedy, Piyush Kumar, Zachary Ahmad, Penelope Jankoski, Anuraj S. Kshirsagar, Jason D. Azoulay, Xuyang He, Mahesh K. Gangishetty, Tristan D. Clemons, Xiaodan Gu, Wujian Miao and Song Guo*, 
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Abstract

Co-doped ZIF-8 as a water-stable visible light photocatalyst was prepared by using a one-pot, fast, cost-effective, and environmentally friendly method. The band structure of ZIF-8 was tuned through the incorporation of different percentages of cobalt to attain an optimal band gap (Eg) that enables the activation of ZIF-8 under visible light and minimizes the recombination of photogenerated charge carriers. A magnetic composite of Co-doped ZIF-8 was also synthesized to facilitate catalyst recycling and reusability through the application of an external magnetic field. Surface modification of magnetic Fe3O4 nanoparticles with microcrystalline cellulose (MCC) was used to reduce the level of agglomeration. The photocatalytic activities of Co-doped ZIF-8 (Co-ZIF-8) and Fe3O4/MCC/Co-ZIF-8 were evaluated for the photodegradation of methylene blue (MB) under visible light irradiation from a 20 W LED source. Co-ZIF-8 showed considerably higher photocatalytic activity than pure ZIF-8, confirming the success of the doping strategy. Both Co20%-ZIF-8 and Fe3O4/MCC/Co20%-ZIF-8 exhibited similar and remarkable photocatalytic activity under visible light (achieving 97% MB removal). The mechanism of photodegradation of MB by Fe3O4/MCC/Co20%-ZIF-8 was studied, revealing a first-order degradation kinetics (k = 13.78 × 10–3 min–1), with peroxide and hole species as the predominant active reagents. The magnetic composite successfully displayed recyclability and reusability over multiple cycles with negligible reduction in MB photodegradation efficiency.

快速简便地合成钴掺杂ZIF-8和Fe3O4/MCC/钴掺杂ZIF-8用于可见光下有机染料的光降解
采用一锅、快速、经济、环保的方法制备了共掺杂ZIF-8水稳定可见光催化剂。通过加入不同百分比的钴来调整ZIF-8的能带结构,以获得最佳带隙(Eg),从而使ZIF-8在可见光下被激活,并最大限度地减少光生载流子的重组。还合成了共掺杂ZIF-8的磁性复合材料,通过外加磁场促进催化剂的回收和再利用。采用微晶纤维素(MCC)对磁性Fe3O4纳米颗粒进行表面改性,以降低团聚程度。研究了共掺杂ZIF-8 (Co-ZIF-8)和Fe3O4/MCC/Co-ZIF-8在20 W LED光源可见光照射下光降解亚甲基蓝(MB)的光催化活性。Co-ZIF-8表现出比纯ZIF-8更高的光催化活性,证实了掺杂策略的成功。Co20%-ZIF-8和Fe3O4/MCC/Co20%-ZIF-8在可见光下表现出相似且显著的光催化活性(达到97%的MB去除率)。研究了Fe3O4/MCC/Co20%-ZIF-8光降解MB的机理,揭示了一级降解动力学(k = 13.78 × 10-3 min-1),过氧化氢和空穴为主要活性物质。磁性复合材料在多次循环中成功地显示了可回收性和可重复使用性,而MB光降解效率的降低可以忽略不计。
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来源期刊
ACS Omega
ACS Omega Chemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍: ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.
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