Adsorption of Congo Red as an indicator for the oxidized jute fabric's sorption properties

Abstract

This work aims to obtain jute fabrics with improved sorption properties that could be used as a novel solution for biodegraded land rehabilitation. For that purpose, raw jute fabric was oxidized with 0.4% sodium periodate (NaIO4), while the adsorption of textile dye Congo Red (CR) was used as an indicator for fabrics' sorption properties. The kinetic study revealed that fabric oxidized for 60 min reached equilibrium dye adsorption after 270 min, while in the case of jute oxidized for 120 min, the equilibrium was attained 30 min faster. This behavior is ascribed to the better availability and higher content of functional groups (capable of binding CR) within fabric oxidized for 120 min than within those oxidized for 60 min. The above-mentioned could be also used as an explanation for the 35 and 50% higher adsorption capacities of fabrics oxidized for 60 and 120 min compared to the raw fabric, respectively. With increasing the initial concentration of CR from 25 up to 100 mg L-1, the equilibrium adsorption increased up to 2.6 times.

Cilj ovog rada je dobijanje tkanine od jute sa poboljšanim sorpcionim svojstvima koja ce se koristititi za rehabilitaciju degradiranog zemljišta. U tu svrhu, sirova tkanina jute oksidisana je 0,4% rastvora natrijum-perjodata (NaIO4), dok je adsorpcija tekstilne boje Kongo crvenog (CR) korišcena kao indikator sorpcionih svojstava. Kineticka istraživanja pokazala su da je tkanina oksidisana tokom 60 minuta dostigla ravnotežnu adsorpciju boje nakon 270 minuta, dok je u slucaju tkanine od jute oksidisane tokom 120 minuta ravnoteža postignuta 30 minuta brže. Ovakvo ponašanje posledica je bolje dostupnosti i veceg sadržaja funkcionalnih grupa (sposobnih da vežu CR) unutar tkanine oksidisane tokom 120 minuta u odnosu na tkaninu oksidisanu tokom 60 minuta. Navedeno bi se moglo koristiti i kao objašnjenje za 35 i 50% vece adsorpcione kapacitete uzoraka tkanine oksidisanih tokom 60 i 120 minuta u pore enju sa sirovom tkaninom, redosledno . Sa povecanjem pocetne koncentracije CR sa 25 na 100 mg L-1, ravnotežna adsorpcija se povecava do 2,6 puta.