The aim of this study is to verify the ability of some photochemical processes in the absence of light (Fenton) and in its presence (photolysis/UV, photo-Fenton/UV and photo-Fenton/Solar) to obtain total decolorization and mineralization of an diazo dye in aqueous solution: the Evans Blue (abbreviated as EB). Batch experiments were carried out to evaluate, on the first stage, the influence of different processes on EB decolorization and mineralization. During the second stage the optimal operational conditions like: H 2 O 2 dosage, EB concentration and source of light were investigated. The reaction efficiencies have been compared for the same system in the dark or under the assistance of an artificial or solar light source. The obtained results showed that color removal followed the increasing order: photolysis/UV (18.2%) < Fe(II)/H 2 O 2 (64.12%) < Fe(II)/H 2 O 2 /UV 365 nm (83.4%) < Fe(II)/H 2 O 2 /solar light (86.3%) < Fe(II)/H 2 O 2 /UV 254 nm (99.9%) with a reaction time of 60 min This improvement could be related to a better production of radicals OH • . In another hand, The efficiency of substrate mineralization in each process has been comparatively discussed by total organic carbon (TOC) and total chemical oxygen demand content of EB solutions.

中文翻译：

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在Fenton和光Fenton辅助下在人工和太阳光下重氮染料的脱色和矿化

这项研究的目的是验证某些光化学过程在不存在光（Fenton）和存在光（光解/ UV，光-Fenton / UV和光-Fenton /太阳能）的情况下获得全部脱色和矿化的能力。水溶液中的重氮染料：伊文思蓝（Evans Blue，简称EB）。在第一阶段进行了批处理实验，以评估不同工艺对EB脱色和矿化的影响。在第二阶段中，研究了最佳操作条件，例如：H 2 O 2剂量，EB浓度和光源。在黑暗中或在人工或太阳能光源的辅助下，已对同一系统的反应效率进行了比较。获得的结果表明，颜色去除遵循增加顺序：光解/ UV（18.2％）<Fe（II）/ H 2 O 2（64。12％）<Fe（II）/ H 2 O 2 / UV 365 nm（83.4％）<Fe（II）/ H 2 O 2 /太阳光（86.3％）<Fe（II）/ H 2 O 2 / UV 254 nm（99.9％），反应时间为60分钟。这种改善可能与自由基OH•的产生有关。另一方面，已通过EB溶液中的总有机碳（TOC）和总化学需氧量对每个过程中底物矿化的效率进行了比较讨论。