Kinetics and isotherm of nickel ions elimination from aqueous solution, by brown alga (Cystoseira indica) from Oman Sea

One of the effective methods for the separation and recovery of heavy metals from aqueous solutions is the use of biosorbents. This study investigated the use of brown algae Cystoseira indica for removal of nickel ions from aqueous solution. In this study، adsorption isotherms and Kinetic nickel ions by algae in a batch reactor was studied. Brown algae were collected from the Coast of Oman Sea in Chabahar. This study showed that for nickel (II) uptakes، equilibrium time was about 120 minutes and the adsorption equilibrium date were well described by Langmuir equation. The maximum capacity was extrapolated to 0. 29 and 0. 34 mmol /g onto Cystoseira indica at pH 4 and 5 respectively. The high values of the correlation coefficient (Sargassum R2 = 0. 953 at pH 4، and R2= 0. 995 at pH 5) and bL the Langmuir constant equalled to 54. 05، 150. 15 which demonstrated equilibrium data concerning algal biomass، which fitted the Langmuir isotherms model equations well.