Decolorization and mineralization of yellow 5 (E102) by UV/Fe²⁺/H₂O₂ process. Optimization of the operational conditions by response surface methodology

详细信息    查看全文

• 作者：Edison GilPavas^a ; ^{egil@eafit.edu.co" class="auth_mail" title="E-mail the corresponding author} ; Carlos M. G&oacute ; mez^a ; Jacek Michal Rynkowski^b ; Izabela Dobrosz-G&oacute ; mez^c ; Miguel Á ; ngel G&oacute ; mez-Garcí ; a^d
• 关键词：Photo-Fenton process ; Tartrazine ; Yellow 5 ; NaCl scavenging effect ; Statistical optimization
• 刊名：Comptes Rendus Chimie
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：18
• 期：10
• 页码：1152-1160
• 全文大小：771 K

文摘

In this study, the optimization and implementation of a homogeneous photo-Fenton process for the decolorization and mineralization of a wastewater containing highly concentrated yellow 5 (E102) dye, resulting from an industry placed in the suburbs of Medellin (Colombia), is presented. Response surface methodology was applied as a tool for the optimization of operational conditions such as initial dyestuff concentration, H₂O₂ concentration, and UV-radiation power (number of lamps). The decolorization, degradation and mineralization efficiencies were used as response variables. The following conditions were found to be optimal for decolorization and mineralization of yellow 5: UV radiation of 365 nm (4 W, one lamp), dye concentration of 200 mg/L, Fe²⁺ concentration of 1.0 mM, H₂O₂ concentration of 1.75 mL/L, treatment time of 180 min, Fe²⁺ concentration of 1 mM and pH = 3. Under these conditions (180 min), the photo-Fenton process allowed us to reach ca. 100% of color dye degradation, 99% of COD degradation, and 85% of mineralization (TOC). The scavenging effect of the Cl^– anion on the photodegradation process was also confirmed.