Decolorization of Textile Dyes by Wet Oxidation Using Activated Carbon as Catalyst
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- 作者：Aurora Santos ; Pedro Yustos ; Sergio Rodrí ; guez ; Fé ; lix Garcia-Ochoa ; Miguel de Gracia
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2007
- 出版时间：April 11, 2007
- 年：2007
- 卷：46
- 期：8
- 页码：2423 - 2427
- 全文大小：82K
- 年卷期：v.46,no.8(April 11, 2007)
- ISSN：1520-5045
文摘
A commercial activated carbon, Industrial React FE01606A, without impregnation of any metal, was used asa catalyst in the wet oxidation of three dyes commonly found in textile wastewaters, Orange G, MethyleneBlue, and Brilliant Green. Runs were carried out in a three phase fixed-bed reactor by feeding concurrentlyan aqueous phase containing 1000 mg/L of the dye and an oxygen gas flow rate of 90 mL/min. Temperaturewas set to 160 
C, and the pressure in the reactor was fixed to 16 bar. The catalyst showed high catalyticactivity in dye conversion and color removal. The catalyst kept stable during the time tested on stream (200h). Total decolorization is obtained at short residence times, but some refractory organic intermediates areobtained (mineralization achieved an asymptotic value about 40-60% depending on the dye). The toxicity ofthe inlet and outlet effluent was measured by the Microtox bioassay, and the oxidation intermediates identifiedand quantified explained the obtained toxicity evolution.
C, and the pressure in the reactor was fixed to 16 bar. The catalyst showed high catalyticactivity in dye conversion and color removal. The catalyst kept stable during the time tested on stream (200h). Total decolorization is obtained at short residence times, but some refractory organic intermediates areobtained (mineralization achieved an asymptotic value about 40-60% depending on the dye). The toxicity ofthe inlet and outlet effluent was measured by the Microtox bioassay, and the oxidation intermediates identifiedand quantified explained the obtained toxicity evolution.