Decolorization Treatment of Copper Phthalocyanine Textile Dye Wastewater by Electrochemical Methods

Abstract

Electrochemical decolorization and degradation treatment of aqueous copper phthalocyanine reactive dye solutions was comparatively studied by electrocoagulation, electrooxidation and electro-Fenton processes. In the electrocoagulation process with aluminum electrodes the colored aqueous solutions of initial pH 6.4 containing 50 mg L-1 copper phthalocyanine and 6 g L-1 NaCl were treated at applied current densities of 2.5 and 5 mA cm-2. Fast and 100% decolorization was achieved in 4 and 2 minutes of electroprocessing respectively. The indirect electrooxidation process was conducted in acidic electrolyte solutions containing 50 mg L-1 copper phthalocyanine and 6 g L-1 NaCl with Ti/Pt and graphite plate electrodes at the applied current density of 10 mA cm-2. Even after 90 minutes of electrolysis time the dye remained by 23 and 18.8 % respectively undegradable. By the direct and indirect electrooxidation with the same amount of Na2SO4 electrolyte and added H2O2 respectively and using the same electrodes, the copper phthalocyanine dye was not or was only barely degraded respectively. In the electro-Fenton process with Fe electrodes and added amounts of H2O2 at pH 3 and an applied current density of 5 mA/cm2 complete degradation of copper phthalocyanine occurred in 15 minutes.

Optimization of color and COD removal from livestock wastewater by electrocoagulation process: Application of Box–Behnken design (BBD)

“…The electric energy consumed to removal of 1g of color and COD was calculated with followng equatuin [44]:…”

Efficiency of response surface methodology for optimizing Reactive Blue 21 dye removal with modified bentonite

“…where, C 0 , C t and C e are the initial, at any time, and equilibrium dye concentrations (mg/dm 3 ), respectively. V is the volume of the solution (dm 3 ) and M is the adsorbent weight (g).…”

“…They are toxic and dangerous even at low concentrations and are harmful to the health of living creature's especially human beings. Therefore, their removal from aquatic environments seems to be crucial [3].…”

Electrochemical treatment of industry wastewaters by capacitive deionization, electrocoagulation and electrooxidation

“…Several methods are applied to remove or decompose oil from oily water, such as biological treatment [103], photo-degradation [110], Fenton and photo-Fenton processes [100], flocculation [118], chemical coagulation [98], precoat filtration [105], ultrafiltration [113], reverse osmosis [109] and electrochemical methods. Electrochemical methods such as direct or indirect anodic oxidation [101,106,111,117], electro-Fenton [116] and electrocoagulation [102,114] have been attracting great attention for the last decades in treating various types of wastewater, as they are easily operated, require relatively low investment cost and are amenable to automation [116]. In spite of abundant applications of electrochemical processes for the treatment of various kinds of wastewater, their use for the treatment of petroleum wastewater is scarce in literature.…”