Revalorizing a Pyrolytic Char Residue from Post-Consumer Plastics into Activated Carbon for the Adsorption of Lead in Water
Metadatos
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Rodríguez Solís, Rafael; Martín Lara, María Ángeles; Ligero, Ana; Balbís, Josefa; Blázquez García, Gabriel; Calero De Hoces, Francisca MónicaEditorial
MDPI
Materia
Pyrolytic char Chemical activation Adsorption Lead Plastic waste
Fecha
2022-08-11Referencia bibliográfica
Solís, R.R... [et al.]. Revalorizing a Pyrolytic Char Residue from Post-Consumer Plastics into Activated Carbon for the Adsorption of Lead in Water. Appl. Sci. 2022, 12, 8032. [https://doi.org/10.3390/app12168032]
Patrocinador
FEDER/Junta de AndaluciaMinistry of Economy, Transformation, Industry, and Universities P20_00167 FEDER/Junta de Andalucia-Ministry of Economic Transformation, Industry, and Universities B-RNM-78-UGR20Resumen
This work focuses on the use of a char produced during the pyrolysis of a mixture of non-recyclable plastics as a precursor for the preparation of porous activated carbon with high developed adsorption uptake of lead in water. Physical and chemical activation was used to enhance the porosity, surface area, and surface chemistry of char. The final activated carbon materials were deeply characterized through N-2 adsorption isotherms, scanning electron microscopy, Fourier transformed infrared spectroscopy, analysis of the metal content by inductively coupled plasma mass spectroscopy, and pH of point zero charge. The native char displayed a Pb adsorption uptake of 348 mg Pb center dot g(-1) and considerably high leaching of carbon, mainly organic, ca. 12%. After stabilization with HCl washing and activation with basic character activators, i.e., CO2, NaOH, and KOH, more stable adsorbents were obtained, with no organic leaching and a porous developed structure, the order of activation effectiveness being KOH (487 m(2)center dot g(-1)) > NaOH (247 m(2)center dot g(-1)) > CO2 (68 m(2)center dot g(-1)). The activation with KOH resulted in the most effective removal of Pb in water with a saturation adsorption uptake of 747 mg Pb center dot g(-1).