Catalytic Activity of Porous Phosphate Heterostructures-Fe towards Reactive Black 5 Degradation

Marco S Lucas,Enrique Rodríguez-Castellón,José Jiménez-Jiménez,José A Peres,Manuel Algarra

doi:10.1155/2013/658231

Abstract

Fenton’s reaction is often used to decompose stable substances in wastewater. In this study, experiments based on the effect of porous phosphate heterostructures as catalyst sorbent of Fe2+synthesised by different procedures were planned. The examined PPH-Fe/H2O2as oxidant in a heterogeneous process under mild conditions at pH 5 was found to be very efficient for discoloration of a simulated wastewater containing 50 mg L−1of a commercial azo dye (Reactive Black 5) reaching 95% of decolourization. Under the described conditions total visual decolourization was achieved after 360 min. This study can provide a simple, effective, and economic system ideal for the treatment of toxic and nonbiodegradable azo dyes.

Highlights

Synthetic dyes are extensively used for textile dyeing, paper printing, color photography, and as additives in petroleum products [1]
The chemical methods are based in the oxidation of the organic materials by oxidizing agents, such as O3 [7,8,9], H2O2 [10, 11], UV light [12], or combination of such oxidants [13, 14], known as advanced oxidation processes (AOPs)
The Fenton reaction, iron-based photocatalytic systems via hydroxyl radicals produced by H2O2 under UV, has attracted much attention for wastewater treatments because of their efficient, low cost, and benignity to environment [15, 16]

Summary

Introduction

Synthetic dyes are extensively used for textile dyeing, paper printing, color photography, and as additives in petroleum products [1]. The Fenton reaction, iron-based photocatalytic systems via hydroxyl radicals produced by H2O2 under UV, has attracted much attention for wastewater treatments because of their efficient, low cost, and benignity to environment [15, 16] This catalytic system decolourizes completely and partially mineralized textile dyes in short reaction time [17]. High specific surface area and CEC are two parameters interesting for the synthesis of Fe2+ exchanged PPH or Fe2+ supported PPH using as well PPH pure silica or a hybrid sulfonic-PPH obtained by oxidation of the respective mercaptopropyl-PPH precursor, obtaining new materials with potential use as heterogeneous catalyst for Fenton and photo-Fenton reactions.

Experimental

Results and Discussion

Conclusions