Enhanced heterogeneous and homogeneous Fenton-like degradation of carbamazepine by nano-Fe3O4/H2O2 with nitrilotriacetic acid

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The influence of a biodegradable agent, nitrilotriacetic acid (NTA), on the degradation of the model compound carbamazepine (CBZ) by the nano-Fe O /H O system was investigated. The results showed that the presence of NTA can provide better performance of the nano-Fe O /H O system for CBZ degradation at reduced usage of H O and nano-Fe O . The optimal concentration of NTA was determined to be 0.5-1.0mM. The first-order rate constant, k , for CBZ degradation by 1.0gL of nano-Fe O and 100mM of H O in the presence of 0.5mM of NTA at an initial neutral pH was determined to be 4.32×10 min , which was 80 times larger than that in the absence of NTA. In addition, the k value increased with the increase in nano-Fe O concentration from 0.1 to 3.0gL , and the H O concentration increased from 5 to 600mM. The initial pH of CBZ solutions over a range of pH 5.0-9.0 did not affect the k value of CBZ (p=0.08). A decrease in the initial concentration of CBZ from 6.35×10 to 1.06×10 mM resulted in an increase of the k value from 4.32×10 to 1.51×10 min . Moreover, the results indicated that the degradation intermediates were generated by the attack of OH. The degradation mechanism of CBZ included both an enhanced heterogeneous Fenton-like reaction on the Fe O nanoparticle surface and an enhanced homogeneous Fenton-like reaction in the aqueous phase by Fe-NTA complexes. © 2014 Elsevier B.V. 3 4 2 2 3 4 2 2 2 2 3 4 app 3 4 2 2 app 3 4 2 2 app app 3 4 -1 -2 -1 -1 -2 -2 -2 -1 -1

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Chemical Engineering Journal

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