Low-cost nanoparticulate oxidation catalysts for the removal of azo and anthraquinic dyes.

ABSTRACT:

Purpose

This study aimed to test the activity of Mn ferrite, hematin-Mn ferrite and colloidal maghemite in decomposition of Orange II (O-II) and Alizarin Red S (ARS) in model aqueous solutions.

Methods

Color removal was explored at room temperature using magnetic stirring with and without a magnetic bar, taking advantage of the solids' magnetism. Decomposition of H₂O₂ was also studied separately and as radicals provider in dye decomposition. Catalyst/dye solution was fixed at 10 mg/4 mL. pH and dye concentration were variable. Absorbance was measured during 120 min by UV-Vis. Reuse of catalysts was also performed.

Results

Azo dyes such as O-II are more resistant to oxidative removal using hydrogen peroxide than anthraquinone-like ARS. CITMD5 redu

SUBMITTER: Nicolas P 

PROVIDER: S-EPMC8172740 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature