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Amino-Acid-Modified-Cashew Gum Flocculant: Synthesis, Characterization, and Application

  • Jalma Maria KleinEmail author
  • Vanessa Silva de Lima
  • Michele Haack
  • José Manoel Couto da Feira
  • Maria Madalena de Camargo Forte
Original paper
  • 2 Downloads

Abstract

Amphoteric poly(O-methacryloyl-l-serine)-grafted cashew gum (CG-g-P(SerMA)) flocculant was obtained with highly efficient in separation and sequential recovery of kaolin particles from aqueous suspension. The highest flocculation efficiency was achieved with a flocculant synthesized using an O-methacryloyl-l-serine:cashew gum molar ratio of 3:1. The CG-g-P(SerMA) at a dosage of 3.0 mg L−1 resulted in a flocculation efficiency of more than 90% within 20 min for kaolin suspension. The efficiency, in standard experiments, the flocculant CG-g-P(SerMA) was superior to cashew gum and polyacrylamide-based commercial flocculants. The flocculation mechanism involves electrostatic interactions between the negatively charged surface of the kaolin and the protonated amino groups of the flocculant under acidic conditions. These results provide new opportunities and challenges for understanding and improving the removal of impurities present in water and wastewater.

Keywords

Cashew gum Amino acid Flocculation Graft copolymer Amphoteric polymers 

Notes

Acknowledgements

The authors are grateful by Brazilian agencie: Conselho Nacional de Desenvolvimento Científico e Tecnológico (Cnpq) [Grant Number 502001/2014-3] and the Empresa Brasileira de Pesquisa Agropecuária (Embrapa)—Campo Experimental de Pacajus-CE for the cashew gum supply.

Supplementary material

10924_2019_1440_MOESM1_ESM.docx (108 kb)
Supplementary material 1 (DOCX 108 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratório de Materiais Poliméricos, Departamento de Materiais, Escola de EngenhariaUniversidade Federal do Rio Grande do Sul (UFRGS)Porto AlegreBrazil

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