Kinetic and isotherm study of Sudan black B removal.

ABSTRACT

In this research, the removal of Sudan black B (SBB) by cadmium hydroxide nanowires loaded on activated carbon is described. After optimizing the variables involved, Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich models were applied to fit the experimental data. The adsorbent correlation coefficient and error analysis indicated the applicability of Langmuir model for the interpretation of equilibrium data. Different kinetic models were applied to analyze the time evolution of removal data. It was found that low quantity of adsorbent (<0.03 g) is capable of removal of large amount of SBB in reasonably short time (<40 min). The adsorption process was found to be described by both pseudo-second-order kinetics and interparticle diffusion mechanism. The effects of variables such as pH, amount of adsorbent, and contact time on batch adsorption process were investigated and optimized.