Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 83, Issue -, Pages 123-135Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2019.11.020
Keywords
Sulfamethazine; Mesoporous carbon; Nano zero valent iron; Sulfate radical
Funding
- Science and Technology Key Project of Henan Province [172102210031]
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In this work, a composite material of mesoporous carbon loaded nano zero valent iron (nZVI/MC) was prepared and used as an activator of persulfate (PS) to degrade sulfamethazine (SMZ). Scanning electron microscopy (SEM) images showed nano zero valent iron (nZVI) was dispersed on the surface or in the mesopores of mesoporous carbon (MC) without aggregation. nZVI/MC has less surface area (175.63 m(2) g(-1)) than MC (240.83 m(2) g(-1)). The adsorption efficiency of SMZ increased as the MC and nZVI/MC dosages increased. However, its adsorption efficiency decreased as its initial concentration and pH value increased for both the MC and nZVI/MC. nZVI/MC+PS process showed the most effective removal for SMZ, its removal rate reached 69.5%. Catalytic degradation results indicated that material dosage and temperature enhanced SMZ degradation in the nZVI/MC+PS process, while SMZ initial concentration had the opposite effect. For the effect of PS concentration, the SMZ removal efficiency increased in the beginning and then decreased. Quenching experiments indicated that SO4 center dot - was relatively more dominant that (OH)-O-center dot in the process of SMZ degradation, which could also be confirmed by EPR analysis. The main degradation pathways of SMZ were the Smiles-type rearrangement and the nitration of aniline moiety. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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