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Role of surface chemistry and morphology in the reactive adsorption of metal ions on acid modified dry bean pods ( Phaseolus vulgaris L.) organic polymers
Author(s) -
Raulino Giselle Santiago Cabral,
Silva Leila Soares da,
Vidal Carla Bastos,
de Sousa Almeida Edmilson,
de Quadros Melo Diego,
Nascimento Ronaldo Ferreira do
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45879
Subject(s) - tannic acid , acrylic acid , adsorption , metal ions in aqueous solution , chemistry , phaseolus , thermal stability , nuclear chemistry , surface modification , polymer , acrylamide , chemical modification , metal , materials science , polymer chemistry , organic chemistry , monomer , botany , biology
The present study aimed at verifying the acid surface modification of dry bean pods subjected to alkaline pretreatment using tannic acid, poly(acrylic acid), and poly(acrylamide‐ co ‐acrylic acid) and evaluate their performances as adsorbents in the metal ions removal. Factorial design was used as a tool to study the variables that affects the modification processes. The results showed that there was an increase in the adsorption capacity after acidic changes, mainly for the tannic acid, achieving 45% increasing of removal of all metal ions. The variable pH had negative significant effect in the modification with tannic acid. When the modifying agent was the poly(acrylic acid), the variable initial concentration presented a positive significant effect. That means more poly(acrylic acid) was immobilized in the surface of the bean pod, resulting in higher capacity of adsorption. Temperature was significant variable in the modification with poly(acrylamide‐ co ‐acrylic acid), resulting in a strongly negative effect. Analyses of material characterization showed that soluble lipid fraction was removed after the alkaline treatment. Although no morphological changes were observed, there was an improving in the availability of the adsorbents sites after chemical modification. Further, the material exhibited thermal stability up to about 300 °C. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45879.