Abstract
The efficiency of phenol degradation via Fenton reaction using mixture of heterogeneous goethite catalyst with homogeneous ferrous ion was analyzed as a function of three independent variables, initial concentration of phenol (60 to 100 mg /L), weight ratio of initial concentration of phenol to that of H2O2 (1: 6 to 1: 14) and, weight ratio of initial concentration of goethite catalyst to that of H2O2 (1: 0.3 to 1: 0.7). More than 90 % of phenol removal and more than 40% of TOC removal were achieved within 60 minutes of reaction. Two separate models were developed using artificial neural networks to predict degradation percentage by a combination of Fe3+ and Fe2+ catalyst. Five operational parameters were employed as inputs while phenol degradation and TOC removal were considered as outputs of the developed models. Satisfactory agreement was observed between testing data and the predicted values (R2 Phenol = 0.9214 and R2TOC= 0.9082).
Highlights
This can be achieved by in-depth investigation and implementing new treatment technologies
When goethite catalyst is used in Fenton oxidation, ferrous ions are produced from the reductive dissolution of goethite as shown below [8,33]
The conclusions of the work can be stated as below: 1. Phenol was successfully degraded by goethite with combination of Fe2+ catalyst and hydrogen peroxide
Summary
This can be achieved by in-depth investigation and implementing new treatment technologies. As a widely used organic contaminant, can be found in various industrial wastewaters (i.e. petrochemical, paper-making, oil-refining, resin manufacturing, coking, and ironsmelting). Biological process cannot remove aromatic compounds such as phenol and benzene in many industrial effluents. There is a growing interest in alternative treatment methods for degradation of highly toxic industrial wastewaters [1]. Use of biological and chemical process to treat phenol in wastewater to standard level (< 2ppm) is difficult due to its high solubility and stability in water [2,3]. As a substitution of conventional processes, advanced oxidation processes (AOPs) have been much investigated in an attempt to degrade toxic compound completely. AOPs use catalytic and chemical photochemical methods to produce strong oxidizing radicals in acidic aquatic media. Fenton oxidation has been proven to be PLOS ONE | DOI:10.1371/journal.pone.0119933 April 7, 2015
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