Abstract
Adsorptive removal of Methyl Red (MR) from aqueous solution onto chemically modified charred sugarcane waste (CSW) and aminated sugarcane waste (ASW) has been investigated. The surface modification was characterized by FTIR, SEM, elemental analysis and Boehm titration. The effect of pH, contact time and MR concentrations were studied by batch equilibrium method. Maximum dye removal was observed at pH 2 onto CSW while that for ASW at pH 7. The dye can be quantitatively removed onto the surface of these adsorbents at a contact time of 3 h. Maximum adsorption capacity (qmax) for the CSW and ASW were found to be 125.0 mg/g and 142.85 mg/g, respectively. Adsorption kinetic data were tested using pseudo-first order, pseudo-second order and intra-particle diffusion models. Kinetic studies revealed that the adsorptive removal of the dye onto the adsorbents followed pseudo-second order kinetics model. The obtained results indicated an excellent alternative for the treatment of dye contaminated wastewater using such chemically modified sugarcane waste at low cost with better efficiency.
Highlights
Rapid progress in industrial activities during recent years has led to the discharge of unprecedented amount of waste water containing different pollutant such as organic surfactants, heavy metal ions, acids, alkalis, solvents and dyes
It was used without further purification and the structure of dye is shown in Figure 1 A stock solution of Methyl Red (1000mg/L) was prepared by dissolving 1g MR in 250 mL of absolute alcohol and was diluted up to the mark by adding distilled water
The final concentrations (Ce) were measured and the amount of MR adsorbed in mg/g at equilibrium was computed by the equation
Summary
Rapid progress in industrial activities during recent years has led to the discharge of unprecedented amount of waste water containing different pollutant such as organic surfactants, heavy metal ions, acids, alkalis, solvents and dyes. Activated carbon is most widely used as adsorbent for removal of dyes from the effluents of different concentrations [16], the process has not been used by small and medium scale industries because of its high manufacturing cost [17]. For this reason, the use of low cost materials as adsorbent is still in progress. We have explored a new process of chemical modification which revealed to have better adsorption properties with the inclusion of amine functional moiety onto the surface of the adsorbent
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