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Degradation of azo dye by an UV/H 2 O 2 advanced oxidation process using an amalgam lamp
Author(s) -
Navarro Patricia,
Pellicer José A.,
GómezLópez Vicente M.
Publication year - 2019
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12418
Subject(s) - chemistry , degradation (telecommunications) , amalgam (chemistry) , nuclear chemistry , methyl orange , photocatalysis , organic chemistry , catalysis , electrode , telecommunications , computer science
The discharge of dyes into water is an ecological problem that can be alleviated by advanced oxidation processes (AOPs), such as UV/H 2 O 2 treatments. Searching for more efficient light sources is a way to improve AOPs’ efficiency. This work tested the efficiency of an amalgam lamp on the degradation of an azo dye, studying the effect of dye and H 2 O 2 concentrations and pH, and the influence of some salts on the decolouration rate of methyl orange. Actinometry showed that the amalgam lamp system was able to provide a high incident photon irradiance (6.30·10 −5 mol/cm 2 s). The amalgam lamp‐driven AOP was able to decolourize the dye at pseudo‐first‐order rates of 0.654–4.008 1/min, with increasing rates at low dye concentration and low pH and at high H 2 O 2 concentrations until a maximum value is reached. The results show that the amalgam lamp can be an alternative light source for fast dye degradation by AOPs.