The efficiency and mechanism of carbon nanotube-enhanced bezafibrate degradation by ferrate
Ferrate(Fe(Ⅵ))has a great application potential as a green oxidant in water and wastewater treatment due to its strong oxidation capacity,but it is less effective on degrade some recalcitrant organic micropollutants in water.In this study,the enhancement effect of carbon nanotubes(CNTs)on the degradation of bezafibrate(BZF)by Fe(Ⅵ)was investigated,the enhanced degradation reaction pathway was explored,the influence of water quality factors on the degradation effect was evaluated,and the key active species for enhanced degradation were identified.The results show that the surface hydroxyl groups on CNTs could promote the BZF degradation by Fe(Ⅵ).At CNTs concentration of 4 mg·L-1,the removal rate of BZF increased from 2％to 69％.Acidic conditions were conducive to CNTs-enhanced BZF degradation by Fe(Ⅵ);The apparent reaction rate constant increased from 89 L·(mol·s)-1 to 415 L·(mol·s)-1 when pH decreased from 8.0 to 6.0.CNTs could enhance the conversion of Fe(Ⅵ)to Fe(Ⅴ),Fe(Ⅴ)became a crucial substance to increase the degradation rate of BZF;Common anions had inhibitory effects on enhanced oxidation,the corresponding impact level was PO43-＞SiO32-＞HCO3-＞Cl-＞NO3-＞SO42-
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