Highly efficient persulfate oxidation process activated with Fe0 aggregate for decolorization of reactive azo dye Remazol Golden Yellow

Abstract

The commercially available Fe 0 aggregate has advantages of low-cost, fast-effective decontamination, reusability, and ease of operation. However, little study has been done on the performance of Fe 0 aggregate as a catalyst in degradation of azo dyes, particularly used in persulfate (PS) oxidation process. This study investigated decolorization of a reactive azo dye, Remazol Golden Yellow (RGY, Reactive Orange 107), by persulfate oxidation activated with Fe 0 aggregate. RGY decolorization was not effective in ultrasound-activated, heat-activated, and base-activated persulfate oxidation; however, a significant decolorization improvement was achieved by applying Fe 0 aggregate to activated persulfate (PS/Fe 0 ). Decolorization was strongly influenced by pH, Fe 0 , persulfate dosages and temperature. The suitable conditions for RGY decolorization were pH 6.0, PS 5 · 10 -3 M, and Fe 0 0.5 g/L. This condition yields 98% color removal of 100 mg/L RGY solution within 20 min treatment; the azo bonds of RGY were completely broken down. RGY decolorization followed the first-order kinetics. Activation energy of the PS/Fe 0 system was 0.479 kJ/mol, suggesting the temperature dependence of RGY decolorization is small. The presence of inorganic salt in RGY solution had an adverse effect on decolorization. The inhibitory effect of various inorganic salts on decolorization followed the sequence of Na 2 HPO 4 ) NaHCO 3 ) NaClO 4 > NaCl > NaNO 3 > NaClO 4 > no salt. The Fe 0 aggregate was reusable and a satisfactory decolorization efficiency was achieved with the repeated use of Fe 0 for five times. The PS/Fe 0 process provides an efficiency and effective technology for RGY decolorization. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation

“…Currently, biotechnology and physicochemical methods are commonly used for dyeing wastewater treatment . Among the physicochemical technologies, advanced oxidation technologies, such as activated persulphate oxidation, have been developed and successfully used for the degradation of colorants . Compared with physicochemical methods, biotechnology is more efficient for organic pollutant reduction, providing a better developed application in the treatment of textile dyeing wastewater.…”

“…2,3 Among the physicochemical technologies, advanced oxidation technologies, such as activated persulphate oxidation, have been developed and successfully used for the degradation of colorants. [4][5][6][7][8] Compared with physicochemical methods, biotechnology is more efficient for organic pollutant reduction, providing a better developed application in the treatment of textile dyeing wastewater. However, these conventional treatment technologies also have their own shortcomings that are difficult to overcome, such as the consumption of additional chemical reagents, a low decolorisation rate and poor desalination efficiency.…”

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

“…This inhibition arises from the rapid consumption of both SO • and •OH radicals owing to the scavenging role of bicarbonate in the solution [55]. A previous report by Weng et al [56] described that the presence of bicarbonate induced Fe-complex formation in the solution, affecting the availability of Fe 2+ for the production of SO • radicals to oxidize compounds in the Fe 2+ /PS system, hence, the degradation efficiency of MB 9 was reduced.…”

Acceleration of Persulfate Activation by MIL-101(Fe) with Vacuum Thermal Activation: Effect of FeII/FeIII Mixed-Valence Center

“…Among these transition metals, Fe has often been selected as a PS activator owing to its low toxicity, low cost, high activity, and natural abundance [15]. However, the Fe/PS system has some intrinsic drawbacks, such as strict pH range limits and accumulation of ferric oxide sludge, which limit its widespread application [16][17][18].…”