Removal of Azo Dyes Reactive Black from Water by Zero-Valent Iron: The Efficiency and Mechanism
2020
Y.Y. Xue, L.P. Liang, Q. Wu, Y.T. Zhang, L.B. Cheng and X. Meng,
The removal kinetics and mechanism of active black removal by zero-valent iron were investigated. The experimental results showed that the rate of reactive black removal by zero-valent iron increased with the decreasing of pH and initial dye concentration, and increased with the increasing of temperature and ZVI dosage. SO42- promoted the removal rate of reactive black. Ca2+ had an inhibitory effect on the removal of reactive black in the early stage by zero-valent iron and promoted it in the later stage, while Mg2+, CO32-, ClO4-, NO3-, PO43- and HCO3- all inhibited the removal rate of reactive black by zero-valent iron. The activation energy was 26.38 KJ mol-1 by using the Arrhenius formula, indicating that this reaction was easy to occur. The degradation process was further analysed by UV-Vis, SEM and XRD, and the main reaction product was Fe2O3.
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