Degradation of azo and anthraquinone dyes by a low-cost Fe 0/air process

Journal of Hazardous Materials
Shih-Hsien ChangLung-Chiu Huang

Abstract

Degradation of two different kinds of dyes, anthraquinone Reactive Blue 4 (RB4) and azo Reactive Black 5 (RB5), by low-cost zero valent iron (Fe(0)) in a N(2) bubbling system (Fe(0)/N(2) process) and air bubbling system (Fe(0)/air process) was investigated. The operating parameters, including initial solution pH, dye concentration and Fe(0) dose, were also evaluated. The Fe(0)/air process shows a higher decolorization rate compared to the Fe(0)/N(2) process. Both RB4 and RB5 solutions at 100 mg L(-1) were rapidly decolorized by Fe(0)/air process within 9 and 3 min, respectively, at initial solution pH 3, Fe dose of 50 g L(-1) and air flow rate of 5 L min(-1). The optimal initial solution pH was 3. The Fe(0)/N(2) process removed only <17% of COD. However, significant COD removals were achieved for RB 4 (87%) and RB5 (43%) by the Fe(0)/air process after 9 min of treatment. Spectra analysis results indicated that the Fe(0)/N(2) process destroyed only the anthraquinone group (A(594)) for the RB4 solution and decreased the azo (A(596)) and naphthalene group (A(310)) for the RB5 solution. However, the Fe(0)/air process rapidly removed A(594), A(370), A(296) (anthraquinone group) and A(256) (aromatic and dichlorotriazine group) for RB...Continue Reading

Citations

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