Use of Thermally Modified Jarosite for the Removal of Hexavalent Chromium by Adsorption

Abstract

Jarosites are residues generated during the purification of zinc and are composed mainly of iron sulfates ((Na, K)Fe3(SO4)2(OH)6). Due to the large volume of jarosite generated during the process, these residues tend to be deposited in large land areas and are not used. In the present work, jarosite was used without heat treatment (JST) as an adsorbent of hexavalent chromium contained in a sample of wastewater from a chrome plating industry under the following conditions: C0 = 200 mg/L of Cr, T = 25 °C, and pH = 3. It was only possible to remove 34% of Cr (VI). Subsequently, a thermal treatment of a jarosite sample (JTT) was carried out at 600 °C. The heat-treated sample was later used as an adsorbent in the same conditions as those for JST. The maximum chromium removal was 53%, and the adsorption capacity was 10.99 mg/g. The experimental data were fitted to the Langmuir model and to the pseudo-second-order kinetic model. It was determined that the adsorption process involved electrostatic attractions between the surface of the positively charged adsorbent and the chromium anions contained in industrial wastewater.

Bioleaching of sulfide containing material from the Wiśniówka Quarry: stability and adhesion of secondary products

“…In a highly acidic environment, the FeOH + groups of jarosite predominate over the FeOgroups. Therefore, the surface has a net positive charge (Picazo-Rodríguez et al, 2022). The zeta potential of jarosite in the presence of surfactants and RL is depicted in Fig.…”

Development and characterizations of jarosite waste reinforced poly(vinyl alcohol) composites: A sustainable approach toward solid waste management

“…8 This material has a brittle trigonal crystal structure and a dark yellow color. Traditionally, it has been used to make paving paths, bricks by combining with fly ash, 9 zinc-iron alloy, 10 removal of hexavalent chromium from wastewater, 11 glass fibers, 12 and as a potential adsorbent for hazardous pentavalent arsenic. 13 According to Asokan et al, 14 jarosite waste can be immobilized through the production of composite goods that incorporate wastes from coal combustion and marble industries.…”

Bifunctional Adsorbents Based on Jarosites for Removal of Inorganic Micropollutants from Water

“…The crystallization parameters, such as the source of iron, reagent ratio, stirring speed, pH, temperature, and pressure, have significantly affected the morphology and the particle size of the jarosite [20]. The jarosites and their chemical and thermal decomposition products have been barely studied as anion adsorbents of metals [22,26].…”