Removal Of A Basic And Azo Dye From Aqueous Solution By Adsorption Using Activated Carbon

Abstract

The removal of dyes from colored effluents, particularly from textile industries, is one of the major environmental concerns these days. Current methods for removing dyes from wastewaters are costly and cannot effectively be used to treat wide range of such wastewaters. This work describes the use of commercial available activated carbon as an efficient adsorbent material for dye removal. Aqueous solutions of various basic dye Methylene Blue (MB) and azo-dye Tartrazine (TZ) concentrations 5-20 mg l -1 and 10-100 mg l -1 , respectively, were shaken with certain amount of adsorbents to determine the adsorption capacity. The effects of adsorbents dose, initial pH, initial dye concentration, agitation speed and contact time on dye removal have been studied. Maximum dye was removed from the solution within 60-90 min after the beginning of every experiment. Adsorption parameters were found to fit well into Langmuir and Freundlich adsorption isotherm models with correlation coefficient (R 2 > 0.99) in the concentration range of MB and TZ studied.

The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles

“… 9 Among physicochemical treatment methods, adsorption is considered an effective method for the removal of azo dyes compared with the other methods because of its relatively low operation cost, high treatment efficiency, non-toxicity, and in particular, it was suitable for the removal of the residue from the secondary effluent. Recently, a wide range of adsorbents have been applied in the treatment of azo dyes, consisting of zeolites, 10 activated carbon, 11 biochar, 12 fly ash, 13 magnetic graphene oxide/chitosan composites, 14 and nanoparticles. 15,16 Among adsorbents, biochars generated from agricultural wastes have widely been used to remove different pollutants.…”