Adsorptive removal of noxious cadmium ions from aqueous medium using activated carbon/zirconium oxide composite: Isotherm and kinetic modelling

By G. Sharma, M. Naushad. 2020

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Abstract The heavy metal ions pollution is serious threat for aquatic and terrestrial living beings. The adsorption is facile process to encounter the heavy metal pollution. Various types of adsorbents have been developed and used for environmental remediation. The activated carbon is one of the cheapest adsorbent derived from various biomass sources and coupled with diverse materials to fabricate superior adsorbents. In the present work, datestone activated carbon-based zirconium oxide (DSAC/ZrO2) composite was fabricated and characterized by XRD, SEM, BET and SEM. The surface area, pore volume and average pore diameter of DSAC/ZrO2 were 153.4 m2 g−1, 0.04 cm3 g−1 and 8.8 nm, respectively. Using batch experiments, sorption of cadmium ions was explored onto DSAC/ZrO2 composite. To have detail insight into sorption process; the isotherm, kinetics and thermodynamic studies were also performed. The experimental equilibrium data for cadmium adsorption using DSAC/ZrO2 composite was well fitted to the Langmuir isotherm model and showed the qm 166.7 mg/g at 25 °C. The negative and positive values of ΔG° and ΔH° indicated that the adsorption was spontaneous and endothermic, respectively.

Subfields: Mechanical Engineering, Organic Chemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/7ed69571a1e877e4e0e9baafb28175dba7506574