Sorption of acid and basic dyes on radiation-grafted Teflon scrap: equilibrium and kinetic sorption studies

Abstract

Mutual radiation grafting technique using Co-60 gamma radiation has been used to graft glycidylmethacrylate (GMA) to Teflon scrap. Cationic and anionic adsorbents were prepared from GMA-grafted Teflon scrap (GMA-g-Teflon) by converting epoxy ring into sulphonic acid and triamine groups by doing suitable chemical reactions at elevated temperatures. The converted grafted product was studied for its dye uptake properties from manufactured aqueous dye solution. Uptake of basic dyes namely, Basic red 29 (BR-29) and anionic dye namely, Remazol brilliant blue-1 (RB-1) was investigated. Langmuir and Freundlich adsorption models were used to analyze equilibrium adsorption, while kinetics of adsorption was analyzed using pseudo-first-order, pseudo-second-order models. The equilibrium adsorption of BR-29 and RB-1 was better explained by Langmuir adsorption model. Separation factor (R L ) was found to be in the range 0 \ R L \ 1, indicating favorable adsorption of basic and acidic dyes. Higher coefficient of determination (or regression) (r 2 ) and better agreement between q e,cal (calculated) and q e,exp (experimental) values were obtained for pseudo-second-order kinetic model.

Chitosan- or glycidyl methacrylate-based adsorbents for the removal of dyes from aqueous solutions: a review

“…136 A mutual radiation grafting technique using Co-60 gamma radiation has been used to graft GMA to Teflon scrap (TS). 137 Cationic and anionic adsorbents were prepared from GMA-g-TS by converting the epoxy ring into sulphonic acid and triamine groups via suitable chemical reactions at elevated temperatures. The converted grafted product was studied for its dye-uptake properties from manufactured aqueous dye solutions.…”

“…The shape and size of the domains would depend on the conversion method and the final drying procedure of the converted samples before recording of the SEM micrographs. 137 Arica et al 138 prepared magnetic MCM-41 (mMCM-41) composite particles and modified them with (3-aminopropyltriethoxysilane) (APTES), which were then grafted with PGMA via surface-initiated atom transfer radical polymerization (SI-ATRP). The PGMA-grafted magnetic MCM-41 particles were functionalized with (tris-2-aminoethylamine) (TAEA) and used as a cationic adsorbent for the adsorptive removal of direct blue 6 (DB6) and direct black 38 (DB38) from an aqueous medium.…”

“…The shape and size of the domains would depend on the conversion method and the final drying procedure of the converted samples before recording of the SEM micrographs. 137…”

“…Fig.18SEM of (a) pristine TS, (b) grafted-TS (% grafting, 51.8%), (c) sulphonic acid grafted-TS (% conversion, 15.9%), and (d) aminated grafted-TS (% conversion, 16.2%) 137. Reproduced from ref 137,. with permission from Springer Nature, 2016.…”