Abstract
A biocomposite system was developed and tested for the removal of the azo dye Reactive Red (RR195) from wastewater. The biocomposite was synthesized using ceramic particles containing 75% alumina which were coated using chitosan cross-linked with oxalic acid. The biocomposite showed high performance at low pH (maximum adsorption capacity = 345.3mg.g-1 at pH=2.0). The physicochemical and structure characteristics of the matrix were evaluated by Z-potential, FTIR-ATR, SEM-EDS, XRD, and porosity. Langmuir sorption isotherm and pseudosecond-order model gave the best fit. The electrostatic interaction between RR195 (due to the sulfonate groups) and the free amino groups of chitosan, enabled successive desorption/regeneration cycles. The maximum removal percentage (>80%) occurred at pH=2.0 due to the cross-linking effect. Experiments at different temperatures allowed the calculation of thermodynamic parameters (ΔG, ΔS, ΔH); adsorption was spontaneous, exothermic, and enthalpy controlled. The presence of inorganic ions ([Formula: see text] ) was analyzed during the adsorption process. This novel biocomposite can be applied as a cost-effective and environmentally friendly adsorbent for anionic azo dye removal from wastewater. The application of chitosan cross-linked with oxalic acid as a coating of the ceramic support enhanced the adsorption capacity and enabled its use under acidic conditions without solubilization.
Highlights
A biocomposite system was developed and tested for the removal of the azo dye Reative Red (RR195) from wastewater
In addition the energy dispersion spectrometry X-ray (EDS) spectrum of BChA showed the presence of N, due to the cross-linked chitosan coating (ChC) on the ceramic material
The biocomposite was prepared using ceramic particles containing 75% alumina which were coated with chitosan previously crosslinked with oxalic acid
Summary
A biocomposite system was developed and tested for the removal of the azo dye Reative Red (RR195) from wastewater. The presence of inorganic ions (NO3->Cl-) was analyzed during the adsorption process This novel biocomposite can be applied as a cost‐effective and environmentally friendly adsorbent for anionic azo dye removal from wastewater. The application of chitosan crosslinked with oxalic acid as a coating of the ceramic support enhanced the adsorption capacity and enabled its use under acidic conditions without solubilization. In the textile industry around 100 tons of dyes are discharged due to the coloring of fibers, which generates a great environmental problem (Yagub et al 2014). The wastewater containing these pollutants directly affects the photosynthetic capacity of aquatic plant species. The chemical structure of the dyes contributes to a high level of organic matter content negatively affecting the water quality (Crini 2006)
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