Synthesis and characterization of magnetic Coconut husk/diopside nanocomposite and its application for removal of reactive dyes from aqueous solutions

In the current study, the magnetic chitosan/rice husk ash/nano alumina was prepared and used as an adsorbent for removal of lead ions from aqueous solutions. The synthesized nanocomposite was characterized by SEM, FTIR, XRD,... [ view full abstract ]

In the current study, the magnetic chitosan/rice husk ash/nano alumina was prepared and used as an adsorbent for removal of lead ions from aqueous solutions. The synthesized nanocomposite was characterized by SEM, FTIR, XRD, and BET. The main and interactive effects of some important adsorption variables such as initial lead ions concentration, PH, adsorbent mass, and contact time were estimated and optimized by central composite design (CCD). Maximum adsorption efficiency of lead ions achieved at optimum conditions including PH of 5, adsorbent mass of 0.01g, initial lead ions concentration of 30 ppm, and contact time of 105 min was discovered to be 90.98%. The adsorption kinetic was consistent with pseudo-second-order model (R²= 0.9967). The lead adsorption isotherms were well fitted to Langmuir model, indicating the maximum adsorption capacity of 181.8180 mg/g. The adsorption process was exothermic and spontateous within the temperature range of 283.15-313.15 k. The regeneration study of the adsorbent caused maintenance of above 70% capacity in the 6 cycles. A comparison of adsorption efficiency of studied adsorbent and other adsorbents for removal of lead ions is given in this paper. Consequently, it should be mentioned that execellent properties of the presented nanocomposite would make it as an ideal adsorbent for removal of lead ions from aqueous solutions.