Agro-Industrial Waste as Potential Heavy Metal Adsorbents and Subsequent Safe Disposal of Spent Adsorbents
Simón, Daiana (Universidad Nacional de Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales)
Palet i Ballús, Cristina (Universitat Autònoma de Barcelona. Departament de Química)
Costas, Agustín (Centro Biotecnológico Fares Taie)
Cristóbal, Adrián (Universidad Nacional de Mar del Plata . Instituto de Investigaciones en Ciencia y Tecnología de Materiales)

Data:	2022
Resum:	Water pollution is an environmental problem that affects the ecosystem and living beings. Adsorption is one of the best technologies for the removal of heavy metals. Since waste recovery is the basis of the Circular Economy, agro-industrial waste is emerging as low-cost adsorbents for these pollutants from wastewater. Residues of pine sawdust, sunflower seed hulls and corn residues mix were evaluated as adsorbents of synthetic aqueous solutions of Ni(II), Zn(II) and Cd(II). These residues were characterized to determine their structure and composition, and to understand the adsorption mechanism. Adsorption efficiencies and capacities for the adsorbents and adsorbates were determined and compared. From the obtained results, it is possible to affirm that all biomasses used are good alternatives to the synthetic materials, with adsorption efficiencies greater than 50%. The order of adsorption was Cd > Zn > Ni. At the concentration range checked, adsorption efficiencies decreased in sawdust when a mixture of all metals together was considered (as present in real sewage). Finally, the heavy metals were immobilized, with efficiencies over 88. 5%, in clay ceramics (as brick's precursors). This procedure would help to minimize the contamination that could be generated by the disposal of spent adsorbents, rarely explored in the literature.
Ajuts:	Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R Ministerio de Economía y Competitividad AGL2015-70393-R European Commission 645024
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Heavy metals ; Agro-industrial waste ; Adsorption ; Wastewater treatment ; Contaminant immobilization
Publicat a:	Water, Vol. 14, Issue 20 (October 2022) , art. 3298, ISSN 2073-4441

DOI: 10.3390/w14203298

19 p, 4.2 MB

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