Issue 37, 2016, Issue in Progress

Exploring the critical dependence of the adsorption of various dyes on the degradation rate using a ferrihydrite surface under visible light

Abstract

The adsorption and degradation of Mordant Yellow 10 (MY10), Eriochrome Black T (EBT) and Phenol Red (PR) in a ferrihydrite (Fh)/H2O2/visible light system were investigated. The affinity of Fh to the three dyes was evaluated based on the Langmuir model parameters, dimensionless separation factor RL, and adsorption–desorption isotherms. The effects of the affinity between the dyes and Fh on the degradation rate of the dyes were studied. The results show that the saturated adsorption capacities of the three dyes on Fh were 206.61, 126.26, and 73.26 mg g−1 for EBT, MY10, and PR, respectively. The degradation rate of EBT was much larger than those of MY10 and PR, but the difference between the degradation rates of MY10 and PR were small. The affinity between the dyes and Fh followed the order of MY10 ≫ EBT > PR. Both strong and weak affinities between the dyes and Fh were unfavorable for their degradation. Only moderate affinity allowed the adsorption–degradation–desorption process of dyes to occur continuously, which resulted in a high degradation rate. When NaNO3 solution was added into the MY10 system, the affinity between MY10 and Fh weakened, and the degradation rate of MY10 increased.

Graphical abstract: Exploring the critical dependence of the adsorption of various dyes on the degradation rate using a ferrihydrite surface under visible light

Article information

Article type
Paper
Submitted
12 Nov 2015
Accepted
18 Mar 2016
First published
21 Mar 2016

RSC Adv., 2016,6, 30840-30845

Author version available

Exploring the critical dependence of the adsorption of various dyes on the degradation rate using a ferrihydrite surface under visible light

S. Liu, C. Ni, H. Su, H. Liu, R. Chen, P. Li and Y. Wei, RSC Adv., 2016, 6, 30840 DOI: 10.1039/C5RA23868D

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