Abstract
The main objective of this work was to study the degradation of Acid Orange 7 (AO7) dye in aqueous solution by hydrogen peroxide using HFe2.5P2W18O62 23.H2O as a catalyst. HFe2.5P2W18O62 23.H2O is a recyclable DAWSON-type heteropolyanion. Effects of various experimental parameters of the oxidation reaction of the dye were investigated. The studied parameters were the initial pH, the initial H2O2 concentration, the catalyst mass, and the dye concentration. The optimum conditions had been determined, and it was found that efficiency of degradation obtained was about 100%. The optimal parameters were: initial pH 4; [H2O2]0 = 2 mM; catalyst mass 0.01 g; concentration of dye 30 mg/L. Infrared spectroscopy analysis of the HFe2.5P2W18O62 23.H2O catalyst indicates that the catalyst showed good stability for degradation of AO7 even after second cycle.
Highlights
The treatment of textile waste waters has always been a serious problem for these industries
The main objective of this work was to study the degradation of Acid Orange 7 (AO7) dye in aqueous solution by hydrogen peroxide using HFe2.5P2W18O62 23.H2O as a catalyst
These results show that the discoloration efficiency of AO7 oxidation increases when increasing the catalytic mass up to 0.01 g where the decolorization efficiency is optimal
Summary
The treatment of textile waste waters has always been a serious problem for these industries These components sometimes are not biodegradable and are toxic enough for aquatic ecosystems [1]. Box 12, 23000 Annaba, Algeria ion exchange on synthetic adsorbent resins, flocculation, and decantation are available for removing dye from water These methods have high operating cost [2] or are inefficient due to complex aromatic structure. [5], which requires separation or removal, increasing the operational cost To solve this problem, many studies have focused on the use of a modified Fenton process (Fenton-Like) to treat waste waters. Acid Orange 7 is one of the dyes that are produced in large amounts in the world It is commonly used in pharmaceutical, food, and cosmetics industries. All other reagents (NaOH or H2SO4) that used in this study were analytical grade
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
