Amine Resin by Chromium (III)‐Fibrous Protein for Enhanced Removal of Two Reactive Anionic Dyes

Abstract

Amine resin (ACrFP) based on chromium (III)‐fibrous protein (CrFP) was synthesized by solvothermal reaction using tetraethylenepentamine, and its utilization in removing two kinds of anionic dyes (reactive brilliant red X‐3B and K‐2BP) was investigated. This adsorbent with protonated amine groups was characterized by SEM‐EDS, zeta potential, FTIR, Raman, and XPS. EDS analysis illustrated that the nitrogen content of ACrFP increased 6.40% compared with CrFP, suggesting grafting of amine groups into the framework of CrFP. Raman analysis of anionic dyes in solution and the ACrFP resin which has adsorbed dyes suggested that X‐3B and K‐2BP in solution have been loaded on solid, and XPS measurement of ACrFP, X‐3B‐ACrFP, and K‐2BP‐ACrFPfurther affirmed the results of Raman. Both sorption isotherms of X‐3B and K‐2BP were favored in lower temperature. About 0.1 mol/L of HCl could desorb reactive red dyes from ACrFP and the regenerated adsorbent could reuse several cycles. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S196–S204, 2019