Abstract
The removal of high-concentration C.I. acid orange 7 (AO7) in aqueous solution by the prepared iron/copper (Fe/Cu) bimetallic particles and zerovalent iron (ZVI) was investigated thoroughly. Fe/Cu bimetallic particles were prepared by planting Cu on the surface of Fe. Experimental results confirmed the superiority of Fe/Cu bimetallic particles for the degradation of AO7 in aqueous solution. Under the optimal conditions ([Fe/Cu]0 = 40 g·L–1, [AO7]0 = 1000 mmol·L–1, initial pH = 6.5, TMLCu = 0.62 g of Cu/g of Fe), the AO7 concentration and chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiencies could reach 94.3%, 61.8%, and 60.8%, respectively, after only 10 min of treatment by Fe/Cu bimetallic particles. Under the same conditions, however, the AO7 concentration and COD and TOC removal efficiencies by ZVI only reached 35.5%, 25.1%, and 21.2%, respectively. Thus, the planting of Cu could improve the reactivity of Fe. The degradation of AO7 was analyzed by UV–vis and Fourier transform...
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