Ecologically friendly chitosan-montmorillonite bio-nanocomposite as adsorbent for textile dyes from aqueous solutions

Natasa Jovic-Jovicic,Sanja Marinovic,Zorica Mojovic,Bojana Nedic-Vasiljevic,Predrag Bankovic,Aleksandra Milutinovic-Nikolic,Tihana Mudrinic

doi:10.2298/sos1704419j

Natasa Jovic-Jovicic, Sanja Marinovic + Show 5 more

Open Access

https://doi.org/10.2298/sos1704419j

Copy DOI

Abstract

The bio-nanocomposite of montmorillonite and natural biopolymer chitosan (C-MM) was synthesized. Intercalation of chitosan in form of monolayer into the interlamellar space of montmorillonite was confirmed by XRD and IR analysis. The adsorption of textile dyes: Acid Yellow 99 (AY99), Acid Orange 10 (AO10) and Reactive Black 5 (RB5) onto C-MM was investigated. The adsorption was performed with the respect to adsorption time, pH and initial dye concentration. The kinetics of adsorption obeyed pseudo-second-order of kinetics and was the most efficient in acidic pH. Langmuir model best described the adsorption of AY99 and AO10 , while RB5 adsorption isotherm was best fitted with Freundlich model.

Highlights

Textile dyes are widely used in everyday life
The d001 value increases from 1.20 nm to 1.52 nm for Chitosan/montmorillonite bio-nanocomposite (C-MM) intercalated chitosan-montmorillonite structure of bio-nanocomposite [12]
The N-H bending vibration of chitosan film shifted from 1548 to 1538 cm-1 in C-MM, which is in accordance with literature data [12]. Such shift can be assigned to the interaction of ammonium groups in chitosan chains with negatively charged sites located in montmorillonite

Summary

Introduction

Textile dyes are widely used in everyday life. Since dyes have a high degree of chemical and photolytic stability [2] adsorption can be regarded as an appropriate method for dye removal prior their release into rivers, lakes etc. Clays are well known as efficient and inexpensive adsorbent of a great variety of inorganic pollutants [5]. In order to be successful adsorbent of different organic pollutants, including textile dyes, the clays must previously be organomodified [6,7,8]. The most common way to organomodify clays is to use quaternary alkylammonium cations (QAAC). The clays modified with QAAC showed good adsorption capacity toward textile dyes only if the loading of QAAC excesses the cation exchange capacity (CEC) of the starting clay [8]. If the amount of QAAC highly excesses CEC the desorption process might occur

Objectives

Methods

Results

Conclusion