摘要：The aim of the present study was to discover the effect of low-cost and ecofriendly nano-porous adsorbent (orange peel) as an ideal alternative to the current expensive methods of removing dye Bromophenol blue (Bb) from aqueous solution. The effects of various experimental parameters (e.g., dye concentration, temperature and pH) were investigated by batch equilibrium experiments. The fitness of Langmuir model in the present system shows the formation of monolayer coverage of the adsorbate at the outer space of the adsorbent. Freundlich model isotherm was analyzed. The monolayer adsorption capacity determined was reasonably high (mg g-1) at Temperature (30, 45, 60°C) 88.11 (mg g-1) and pH (5.5, 6.8, 7.8) 149.760 (mg g-1) for adsorption of Bromophenol blue dye, respectively. The values of dimensionless equilibrium parameter like separation factor (RL) at different particle size and temperature indicates the favorability of the process described in the present study. The kinetics of Bromophenol blue dye adsorption nicely followed pseudo-first and second order rate expression and a significant role in the adsorption mechanism. Langmuir and Freundlich models could be used to describe dye sorption on nano porous adsorbent at equilibrium and also the kinetic data gave a better fit. The model fits the second order equation well with correlation coefficients of 0.99967. The adsorption behavior of Bb on orange peel was investigated by FT-IR technique. We concluded on the basis of the results shown in this study that orange peel was an attractive candidate for removing Bb dye from the dye wastewater.
