{'fraction_non_alphanumeric': 0.04250295159386069, 'fraction_numerical': 0.04014167650531287, 'mean_word_length': 4.93006993006993, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Kinetics of the Decolorization by Fenton's Reagent

Abstract Fenton's reagent was employed in the decolorization of aqueous solutions of one of three dyestuffs (Acid Red 27, Reactive Blue 81, Acid Blue 62). The decolorization with Fenton's reagent was found to be simple and fast. In order to determine the reaction kinetics of the decolorization the stopped-flow technique under pseudo-first order conditions was used. Experiments were carried out at pH=2, at the excess of ferrous salts (FeCl2·4H2O or FeSO4·7H2O). The rate constants of the decolorization determined by us are in the same order of magnitude: 90 to 100 dm3/(mol-s) for FeSO4·7H2O/H2O2, and 40 to 50 dm3/(mol-s) for FeCl2·4H2O/H2O2 systems. The difference between the rate constants for both ferrous salts indicates that the Fenton's reaction may proceed via different mechanisms.