Removal of Congo Red and Methyl Red using Low Density Polyethylene-Chitosan Nanoparticles Biocomposite in Single and Binary-component System

Oluwatosin Emmanuel Daramola,Oluwaseun Adekoya Adelaja

doi:10.34198/ejcs.5221.307327

Oluwatosin Emmanuel Daramola, Oluwaseun Adekoya Adelaja

Open Access

https://doi.org/10.34198/ejcs.5221.307327

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Abstract

The low density polyethylene-chitosan nanoparticles (LDPE/CHNP) biocomposite was applied as a biosorbent for the adsorption of Congo red (CR) anionic dye and methyl red (MR) a cationic dye an in single and binary system. The effect of parameter pH, contact time, initial concentration, adsorbent dosage and temperature were studied on the two dyes in single and the binary component system. Kinetic studies showed that adsorption on LDPE/CHNP in a single and binary-component system follows pseudo-second order kinetics. The values of CR in single and binary system were gotten to be 0.9996 and 0.9984 respectively, while the values of MR in single and binary system were 0.9994 and 0.9983 respectively. The adsorption equilibrium study was tested with both Langmuir and Freundlich isotherm and the result showed they agree more with Langmuir have an values for CR in single and binary system to be 0.9995 and 0.9991 respectively, while the values of MR in single and binary system were 0.9954 and 0.9983 respectively; which implies that the adsorptions were more of chemisorption than physiosorption reaction. In the single and binary systems, the result reveals that CR had higher adoption efficiency than MR which could be because the chelation between cations and chitosan chains, which decreased the electrostatic interaction between Methyl red and chitosan nanoparticles of the biocomposite. The LDPE/CHNP biocomposite has proved to be an efficient adsorbent for CR (anionic dye) and MR (cationic dye) in single and two-component system which are frequently encountered composition of industrial effluents.

Highlights

Wastewater from dye and textile, as well as pulp and paper industries usually contain dye stuff, soluble substances and suspended solids (Yeşim and Başak [1])
These structural properties might improve the uptake of the Methyl red and Congo red dyes from aqueous solution
The result of the micrograph image of LDPE/CHNP suggest that it has the capacity to adsorb dye due to the presence of chitosan nanoparticles in the matrix of LDPE which naturally would not be an adsorbent as the pore sized will be too tight to adsorb

Summary

Introduction

Wastewater from dye and textile, as well as pulp and paper industries usually contain dye stuff, soluble substances and suspended solids (Yeşim and Başak [1]). Dyes are important pollutants, which results in serious environmental and health hazard to humans, animals and aquatic life. Pigments and dyes transferred into the wastewater system results in contamination of water body which are always difficult to treat. Even after the conventional process of contaminant removal, the colour of the dyes still persist. Several techniques and methods can be employed to achieve the removal of dye from wastewater, such as membrane separation, flocculation, ion exchange, precipitation, adsorption. The conventional method of dye removal is associated with the problem low efficiency and high cost (Zhang et al [2]). Adsorption or biosorption employing the use of low cost adsorbent or biosorbent is regarded as the simplest, cost-effective and efficient technique (Gupta et al [3])

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