Al(OH)3 /RM composite: Kinetic and isotherm studies for the adsorption of Zn(II) ions from aqueous solution

The unwanted industrial waste red mud (RM) embedded with Al(OH)3 was prepared and used for removal of Zn(II) ions from industrial wastewater. This prepared bio-adsorbent has brilliant efficiency towards zinc, which offers typical benefits including great adsorption capacity, easy preparation, and effective isolation from given aqueous solution. Several characterization techniques like FT-IR, XRD, SEM and EDX were employed for the adsorption process. From the results of kinetics and isotherm data, it has been inferred that the experiment was well-established to pseudo second order kinetics model with R2 value 0.9945 and followed Langmuir adsorption isotherm (R2=0.9938) with maximum adsorption capacity 26.87 mg/g at pH 5. The results suggested that the Al(OH)3/RM adsorbent material have strong affinity to zinc and could be used as an excellent adsorbent for treatment of zinc contaminated wastewater.