PEFTEC 2017 - Abstract

Abstract Title: Synthesis of highly dispersed polymeric materials and application on wastewater remediation
Abstract Type: Oral
Presenter Name: Dr Jacques Romain Njimou
Co-authors:Ms Mary Sieugaing Tamwa
Prof Charles Péguy Nanseu-Njiki
Prof Emmanuel Ngameni
Company/Organisation: Analytical Chemistry Laboratory, University of Yao
Session Choice: Water Treatment

Abstract Information :

Nowadays, heavy metals and organic compounds are used in various processes such as metal coating of paints, electroplating, surface treatment, photography, electronics, etc. Congo Red (CR)[1-naphthalene sulfonic acid, 3.30-(4.40-biphenylenebis (azo)) bis (4-amino-) disodium salt] is a typical and the first synthetic dye of anionic azo dyes used in cellulose industries such as paper, pulp and cotton textile in the tropical zone. Cadmium [Cd (II)], one of three heavy metals and CR are serious hazard to aquatic living organisms and can cause carcinogen to humans. Due to the large discharged volume and effluent combustion, wastewaters are rated as the most polluting species among in all industrial discharges. Their presence in water, even at very low concentrations, is distinctly visible; it is undesirable and may dramatically affect the photosynthetic activity in the aquatic life due to the reduced light penetration.

In view of these reasons, the present study is focused on the bioanalysis of CR and Cd (II) removal from wastewater. The polymeric material highly dispersed on alginate and oxide of iron/aluminum were synthesized based on wood sawdust and orange skin wastes. The characterization of the synthesized materials by FTIR spectroscopic confirmed the withdrawal of extractibles, hemicelluloses and celluloses during the synthesis.

The removal of Cd (II) ions from synthetic wastewater by using alginate wood sawdust (Triplochiton scleroxylon) were investigated with respect to the adsorption parameters. The equilibrium data were modelled using Langmuir isotherm suggesting the monolayer adsorption of the cadmium. From D-R isotherm model, the mean free energy was calculated to be 5.39 kJ/mol, which indicated that Cd (II) adsorption ions could include an important physicsorption stage.

The highly dispersed polymeric materials were used as an electrochemical material for the preparation of carbon paste electrodes (CPE) named CPE-Fe, CPE -Al and CPE-Fe/Al, for iron, aluminum and mixed of iron/aluminium respectively, and were used as a working electrode for the electroanalysis of Congo Red (CR) in an aqueous medium. Two electrochemical techniques namely cyclic voltammetry and square wave voltammetry were operated for the bioanalysis of anionic dyes from wastewater. The obtained results have shown by cyclic voltammetry the reversibility of the system and the electronic transfer process of the analyte to the surface of the sensor was controlled by the diffusion. These values indicated that this electrode was very effective for the detection of Congo Red in synthetic wastewaters.

The results indicated that the highly dispersed polymeric materials could be an alternative material in place of more costly adsorbents used for the wastewater remediation.