Abstract

ABSTRACT Red mud, a waste product generated during alumina extraction from bauxite, could be used as a low-cost adsorbent. Here, the effect of thermal treatment on the adsorption of Reactive Blue 19 (RB19) dye by red mud was compared with the adsorption capacity of untreated red mud. Thermal treatment of red mud at 500°C results in an increase in adsorption capacity from 357 mg g-1 (untreated red mud) to 416 mg g-1, under acidic conditions. Red mud samples thermally treated at 600°C and 800°C show a reduction in adsorption capacity, however, falling to 337 mg g-1, in acid medium. The change in the maximum adsorption capacity of red mud to RB19 following thermal treatment is associated with specific surface area. Red mud subjected to 500°C can be used for the treatment of water and wastewaters with a higher efficiency than untreated red mud, thus finding possible application in the textile industry.

Highlights

  • Brazilian mining activities contribute significantly to global mineral production, including the largest global production of niobium, the second largest production of iron and manganese, and the third largest production of bauxite (BRASIL, 2018)

  • Mineralogical analysis showed that the thermal treatment of the red mud transforms its mineralogy, causing an increase in SSA

  • The adsorption of Reactive Blue 19 (RB19) in aqueous solutions on untreated and thermally-treated red mud was highly dependent on the pH of the solution, with the highest percentage of adsorption occurring at pH 4

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Summary

Introduction

Brazilian mining activities contribute significantly to global mineral production, including the largest global production of niobium, the second largest production of iron and manganese, and the third largest production of bauxite (BRASIL, 2018). Most commercial systems for the removal of dyes from industrial RM600, and RM800 were determined using the ratio 1:25 Red mud is used as a low-cost adsorbent in environmental remXe-dRiaatyiondiafnfrdactionth(eXeRleDct)ricwaal csounsdeudcttivoitdyeintetrhmeisnuepemrninatearnatllicqoumidpwoesrietimoneaususirnedg uasiPnghialidpirect industrial effluent treatment.

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