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Title
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Nano-architecture of MOF (ZIF-67)-based Co3O4 NPs@N-doped porous carbon polyhedral nanocomposites for oxidative degradation of antibiotic sulfamethoxazole from wastewater
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Type
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JournalPaper
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Keywords
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N-doped porous carbon Degradation Sulfamethoxazole
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Abstract
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Co3O4 NPs in N-doped porous carbon (Co3O4 NPs@N-PC) materials were prepared by one-pot pyrolysis of a ZIF- 67 powder under N2 atmosphere and followed by oxidation under air atmosphere (200 ◦C) toward promotion catalytic activity and activation of peroxymonosulfate (PMS) to degradation sulfamethoxazole (SMZ). 2-methylimidazole was used as a nitrogen source and a competitive ligand for the synthesis of Co3O4 NPs@N-PC, which in addition to affecting nucleation and growth of the crystal, promotes the production of active Co–N sites. Co3O4 NPs@N-PC nano-architecture has high specific surface areas (250 m2 g− 1) and is a non-toxic, effective and stable PMS activator. The effect of operating parameters including SMZ concentration, catalyst dosage, temperature and pH in the presence of Co3O4 NPs@N-PC was investigated. The Co3O4 NPs@N-PC composite showed superior performance in activating PMS over a wide range of pH (2–10) and different temperatures so that complete degradation of SMZ (50 μM, 100 mL) was achieved within 15 min. The role of Co2+/Co3+ redox system in the mechanism before and after PMS activation was determined using XPS analysis. Surface-generated radicals led to the degradation of SMZ, in which the SMZ degradation rate attained 0.21 min− 1 with the mineralization of 36.8%. The feasible degradation mechanism of SMZ was studied in the presence of different scavengers and it was revealed that the degradation reaction proceeds from the radical/non-radical pathway and in this process most of the SO4•− and •OH radicals are dominant. The recoverability and reuse of Co3O4 NPs@N-PC were evaluated to confirm its stability and potential for SMZ degradation and it was observed that the catalyst maintains its catalytic power for at least 5 cycles.
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Researchers
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Rafael Luque (Not In First Six Researchers), Abdollah Salimi (Not In First Six Researchers), Sadegh Rostamnia (Not In First Six Researchers), Mehdi Rahimi-Nasrabadi (Not In First Six Researchers), Mohammad Reza Ganjali (Not In First Six Researchers), Hermann Ehrlich (Fifth Researcher), Amir Mohammad Sorouri (Fourth Researcher), Behnam Gholipour (Third Researcher), Mojtaba Rostami (Second Researcher), Hamed Mohtasham (First Researcher)
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