Optimization of dye adsorption process for Albizia lebbeck pods as a biomass using central composite rotatable design model

Abstract

Article Highlights• Highest adsorption efficiencies were obtained at low concentrations and low weights • Increasing the adsorption time can possibly have a negative effect on efficiency • Adsorption time parameter can be a positive factor at high concentrations and biomass Abstract Albizia lebbeck biomass was used as an adsorbent material in the present study to remove methyl red dye from an aqueous solution. A central composite rotatable design model was used to predict the dye removal efficiency. The optimization was accomplished under a temperature and mixing control system (37 °C) with different particle size of 300 and 600 μm. Highest adsorption efficiencies were obtained at lower dye concentrations and lower weight of adsorbent. The adsorption time, more than 48 h, was found to have a negative effect on the removal efficiency due to secondary metabolites compounds. However, the adsorption time was found to have a positive effect at high dye concentrations and high adsorbent weight. The colour removal efficiency was found to increase with the increase in methyl red concentration and decrease the adsorption time at constant adsorbent weight.

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

“…where 2n indicates the factorial runs [40]. The codes, range and level for three independent variables for SCH and NCH adsorbent are presented in Table 1, and CCRD design matrix for SCH and NCH adsorbent is given in Tables 2 and 3.…”