Degradation of dyes from aqueous solution by Fenton processes: a review

Abstract

Several industries are using dyes as coloring agents. The effluents from these industries are increasingly becoming an environmental problem. The removal of dyes from aqueous solution has a great potential in the field of environmental engineering. This paper reviews the classification, characteristics, and problems of dyes in detail. Advantages and disadvantages of different methods used for dye removal are also analyzed. Among these methods, Fenton process-based advanced oxidation processes are an emerging prospect in the field of dye removal. Fenton processes have been classified and represented as "Fenton circle". This paper analyzes the recent studies on Fenton processes. The studies include analyzing different configurations of reactors used for dye removal, its efficiency, and the effects of various operating parameters such as pH, catalyst concentration, H2O2 concentration, initial dye concentration, and temperature of Fenton processes. From the present study, it can be conclude that Fenton processes are very effective and environmentally friendly methods for dye removal.

Nanoparticles Loaded Biopolymer as Effective Adsorbent for Adsorptive Removal of Malachite Green from Aqueous Solution

“…Many treatment technologies have been applied in order to decolorize MG from an aqueous medium such as coagulation-flocculation [5,6], biodegradation [7], photocatalytic degradation [8], sonochemical and sonophotocatalytic degradation [9][10][11], ozonation [12], and Fenton reagent [13][14][15][16]. Among all these techniques, adsorption is regarded as simple, economically manageable, and desirable process for the treatment of industrial effluent due to its high efficiency and ability to separate a wide range of pollutants.…”

Green Synthesis of Iron Nanoparticles by Aqueous Extract of Eriobotrya japonica Leaves as a Heterogeneous Fenton-like Catalyst: Degradation of Basic Red 46

“…Dye molecules consist of color bearing groups such as an aromatic structure called chromophore absorbing visible light and an auxochromes include -NH 3 , -COOH, -HSO 3 , and -OH which can increase strength for bonding to fibres and support for water solubility [2], [3]. Moreover dyes can be classified as acid, basic, direct, dispersive, reactive, mordant, sulphur, and vat dyes according to mode of operation in textile industry.…”

“…Moreover dyes can be classified as acid, basic, direct, dispersive, reactive, mordant, sulphur, and vat dyes according to mode of operation in textile industry. Azo-dyes are the most important and largest group of dyes constituting about 70% of the total dyes used for coloring [3]. They are posses one or more azo groups (-N=N-), which form bridges between two or more aromatic rings [3].…”

“…Azo-dyes are the most important and largest group of dyes constituting about 70% of the total dyes used for coloring [3]. They are posses one or more azo groups (-N=N-), which form bridges between two or more aromatic rings [3].…”

“…Therefore; several physical, chemical, and biological treatment methods such as adsorption, ion-exchange, photocatalysis, membrane separation, coagulation, electrocoagulation, and wet air oxidation have been used to eliminate these harmful effects of dye effluents but these methods are restricted from generation of toxic chemical sludge in consequence of they just transfer the contaminants from the wastewater to the solid phase, high operational cost of some, and their limited applicability [1], [3], [7].…”