In this study we investigated the efficiency of a wide panel of 24 solid sorbents comprising layered structures (hydrotalcites and zirconium phosphates), magnesium oxide and hydroxide, phyllosilicates, silica, and alumina, as agents for the effective and high yield removal of tartrazine from its aqueous solutions. Quantification of this azo dyes was made by HPLC analyses of the filtrate after collection of sorbents. Overnight treatment of tartrazine solutions at a concentration of 10 µg/mL with 100 mg of each solid sorbent resulted in a practically complete bleaching in 9 cases, namely Zn Al nitrate (99.9 %), Zn Al chloride (99.9 %), Mg Al nitrate (99.8 %), Mg Al azelate (99.9 %), Mg Al hydroxy chloride (99.9 %), zirconium phosphate (type B) + octadecylamine (99.9 %), MgO (99.8 %), and Mg(OH)2(99.7 %), out of 24. The most effective solids to this aim were seen to be aluminium based layered double hydroxides. The presence of this cation residues in the crystal structures of such sorbents seems to be a determinant in facilitating the adsorption of tartrazine by tight interaction with its sulfonate moieties. Recyclability and reuse of such solids have been assessed using Mg Al azelate as the reference. After its recovery and drying, five assays were accomplished under the same experimental conditions providing percentages of adsorption of tartrazine from its aqueous solution in the range 99.1 % − 99.6 %. The highest amount of tartrazine adsorbable on the most efficient sorbents have been obtained by adsorption isotherms and fall in the range 168.9–185.7 mg/g. © 2022 Elsevier B.V.

Efficient removal of tartrazine from aqueous solutions by solid sorbents

Fiorito S;Epifano F
;
Palumbo L;Collevecchio C;Genovese S
2022-01-01

Abstract

In this study we investigated the efficiency of a wide panel of 24 solid sorbents comprising layered structures (hydrotalcites and zirconium phosphates), magnesium oxide and hydroxide, phyllosilicates, silica, and alumina, as agents for the effective and high yield removal of tartrazine from its aqueous solutions. Quantification of this azo dyes was made by HPLC analyses of the filtrate after collection of sorbents. Overnight treatment of tartrazine solutions at a concentration of 10 µg/mL with 100 mg of each solid sorbent resulted in a practically complete bleaching in 9 cases, namely Zn Al nitrate (99.9 %), Zn Al chloride (99.9 %), Mg Al nitrate (99.8 %), Mg Al azelate (99.9 %), Mg Al hydroxy chloride (99.9 %), zirconium phosphate (type B) + octadecylamine (99.9 %), MgO (99.8 %), and Mg(OH)2(99.7 %), out of 24. The most effective solids to this aim were seen to be aluminium based layered double hydroxides. The presence of this cation residues in the crystal structures of such sorbents seems to be a determinant in facilitating the adsorption of tartrazine by tight interaction with its sulfonate moieties. Recyclability and reuse of such solids have been assessed using Mg Al azelate as the reference. After its recovery and drying, five assays were accomplished under the same experimental conditions providing percentages of adsorption of tartrazine from its aqueous solution in the range 99.1 % − 99.6 %. The highest amount of tartrazine adsorbable on the most efficient sorbents have been obtained by adsorption isotherms and fall in the range 168.9–185.7 mg/g. © 2022 Elsevier B.V.
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S1383586622004671-main.pdf

Solo gestori archivio

Tipologia: PDF editoriale
Dimensione 641.1 kB
Formato Adobe PDF
641.1 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11564/773487
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 11
social impact