Skip to main content
International Academy of Wood Science 2018 Annual Meeting

Papers Proceedings »

Chemical modification to obtain a zwitterionic cellulose and its performance in the uptake of Congo red dye

In this study was successfully synthesized a new adsorbent by the modification of cellulose with zwitterionic moieties as well as its removal efficiency of Congo red dye was evaluated. The chemical functionalization followed three steps: 1) synthesis of the zwitterionic precursor (TS) with N1-3-(trimethoxysilylpropyl)diethyelenetriamine and 1-4 butane sultone with equimolar moieties, 2) cellulose activation with NH4OH and 3) co-condensation reaction between available hydroxyl groups of cellulose with hydroxyl groups of the hydrolyzed precursor in heterogeneous media. The material was characterized by FT-IR, 13C/29Si NMR CP/MAS spectroscopy and ninhydrin method. These characterization tests demonstrated that chemical modification of cellulose was successfully carried out with a substitution degree up to 16.93%. Batch experiments were applied for evaluation of the uptake of Congo red in aqueous solutions. The isotherm equilibrium data fitted well with Langmuir model, with a maximum theorical adsorption capacity up to 541.8 mg g-1. The kinetics of sorption data for this system followed a pseudo-second order model. Almost complete removal was possible with 10 mg of the adsorbent from 6 mL of dye solution sample of 400 ppm in 1.3 h. Despite of the natural affinity of cellulose for Congo red dye, modified cellulose showed an improved uptake up to 8.6 times.

Cesar Mario Laureano Anzaldo
Universidad de Guadalajara
Mexico

Nadia B. Haro Mares
Universidad de Guadalajara
Mexico

Fernando A López Dellamary Toral
Universidad de Guadalajara
Mexico

Juan C. Meza Contreras
Universidad de Guadalajara
Mexico

Jorge R. Robledo Ortíz
Universidad de Guadalajara
Mexico

Ricardo Manríquez González
Universidad de Guadalajara
Mexico

 


Powered by OpenConf®
Copyright ©2002-2018 Zakon Group LLC