Adsorption Behaviors of Acidic and Basic Dyes by Thiourea-modified Nanocomposite Aerogels Based on Nanofibrillated Cellulose

Kai Liu, Lihui Chen, Liulian Huang, Shan Lin, Shilin Cao, Hongping Wang

Abstract


Inspired by the high adsorption efficiency of aerogels, a thiourea-modified nanocomposite aerogel consisting of nanofibrillated cellulose and chitosan was prepared via a facile method. The prepared novel aerogel was studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The adsorptions of the acidic and basic dyes (acid orange 7 and crystal violet) on the aerogel from aqueous solutions were investigated according to the adsorption kinetics and isotherms. The results indicated that a pseudo-second-order kinetic model more accurately described the adsorption process than a pseudo-first-order model, and the adsorption processes of both acid orange 7 and crystal violet on the aerogel were controlled by both inter-facial and intra-particle diffusions simultaneously. The Langmuir isotherm was a better model as compared to Freundlich model for the adsorption of dyes. The aerogel prepared by the facile approach is a promising material for practical applications in acidic and basic dye removal.

Keywords


Nanofibrillated cellulose; Nanocomposite; Aerogel; Adsorption; Dye

Full Text: PDF

Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022, hubbe@ncsu.edu; Lucian A. Lucia, (919) 515-7707, lucian.lucia@gmail.com URLs: bioresourcesjournal.com; http://ncsu.edu/bioresources ISSN: 1930-2126