Chromium VI and Fluoride Competitive Adsorption on Different Soils and By-Products

Processes

David Fernández-Calviño¹  Manuel Arias-Estévez¹  JuanCarlos Nóvoa-Muñoz¹  Avelino Núñez-Delgado²  Gustavo Ferreira-Coelho²  Ana Quintáns-Fondo²  MaríaJ. Fernández-Sanjurjo²  Esperanza Álvarez-Rodríguez² 

[1] Department of Plant Biology and Soil Science, Faculty of Sciences, Campus Ourense, Universidade de Vigo, 32004 Ourense, Spain;Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Universidade de Santiago de Compostela, 27002 Lugo, Spain;

关键词: adsorption;    chromium;    competition;    fluoride;    soil and water pollution;   

DOI  :  10.3390/pr7100748

来源: DOAJ

【 摘 要 】

Chromium (as Cr(VI)) and fluoride (F⁻) are frequently found in effluents from different industrial activities. In cases where these effluents reach soil, it can play an important role in retaining those pollutants. Similarly, different byproducts could act as bio-adsorbents to directly treat polluted waters or to enhance the purging potential of soil. In this work, we used batch-type experiments to study competitive Cr(VI) and F⁻ adsorption in two different soils and several kinds of byproducts. Both soils, as well as mussel shell, oak ash, and hemp waste showed higher adsorption for F⁻, while pyritic material, pine bark, and sawdust had a higher affinity for Cr(VI). Considering the binary competitive system, a clear competition between both elements in anionic form is shown, with decreases in adsorption of up to 90% for Cr(VI), and of up to 30% for F⁻. Adsorption results showed better fitting to Freundlich’s than to Langmuir’s model. None of the individual soils or byproducts were able to adsorbing high percentages of both pollutants simultaneously, but it could be highly improved by adding pine bark to increase Cr(VI) adsorption in soils, thus drastically reducing the risks of pollution and deleterious effects on the environment and on public health.

【 授权许可】

Unknown