Adsorptive Removal Of Methylene Blue From Wastewater By Naoh Chemically Modified Sugarcane Bagasse Biochar

Abstract

During the past years different methods were studied for the removal of dyes from industrial effluents as their disposal have toxic effects to humans, animals, plants and the aquatic organisms. Very recently biochar based adsorbents have been extensively used as efficient and cost effective materials to remove Methylene Blue (MB) dye from wastewater. Therefore, in this research work, NaOH modified sugarcane bagasse (SCB) biochar was used as a low-cost bio- sorbent for removal of MB dye present in textile wastewater. The chemical and physical characteristic of biochar’s were characterized by Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), Scanning electron microscopy (SEM), TGA, and BET. During adsorption: effects of the contact time, mass of the adsorbent, pH, and initial dye concentration on the adsorption capacity were studied. SCB biochar at BSCB500 oC provided the highest surface area of 732.6 m 2 /g. The optimal results in effect of process parameters of the analysis were for optimum adsorption of MB on selected porous SCB biochar 86.55 %, pH 8, adsorbent dose 0.8 g, and concentration of MB 5.49 g/ml and contact time 80 min. The result for the present study shows the pseudo-first-order model with correlation coefficient 0.81 and (0.76) was not fit the experimental data therefore this data was not suitable for this model while the pseudo second-order model fitted very well with R 2 was equal to a unit (R2 = 0.99) so this data was suitable for this work. Generally, the MB adsorption on SCB biochar can be described as the pseudo-second-order model, which indicated that the adsorption of MB on SCB biochar can be described as chemical adsorption. Therefore, an adsorption test of wastewater was conducted with BSCB500 oC as adsorbent. The results obtained in this study indicated that SCB biochar will be an attractive for removing cationic dyes from the dye wastewater.