Abstract

In this study we engaged the use of a low-cost adsorbent, Delonixregia in the adsorption and removal of Cr (VI) ions from synthetic wastewater. The effects of different experimental conditions such as solution pH, contact time and temperature were studied so as to optimize the adsorption process. An optimum pH of 1 and contact time of 240 min were obtained for the adsorption process. Modelling the kinetic data showed that pseudo-second-order kinetic model provided the best fit for. The study showed that Delonixregia have an adsorption capacity of 9.23 mg/g for chromium (VI) ions, increasing the adsorbent dose increased the uptake of chromium (VI) ions while the presence of Mg2+, Ca2+ and Na+ reduced the capacity of Delonixregia for the uptake of chromium (VI) ions as .........................................