Hierarchical Activated Porous Activated Carbon Derived from Callistemon Leaf Biochar for Supercapacitor and Methylene Blue Removal Applications

Vishnu Sankar Sivasankarapillai1

Atchaya Sundararajan2

Muthusankar Eswaran3

Ragupathy Dhanusuraman1,4,Email

1Nano Electrochemistry Laboratory (NEL), Department of Chemistry, National Institute of Technology Puducherry, Karaikal - 609609, India.
2SEEE, Department of Physics, SASTRA Deemed University, Thanjavur, Tamilnadu, 613401, India.
3School of Electronic Systems and Automation (SoE), Digital University Kerala, Technocity Campus Mangalapuram, Thonnakkal P.O, Kerala 695317, India.
4Nano Electrochemistry Laboratory (NEL), Central Instrumentation Facility (CIF), School of Physical, Chemical and Applied Sciences, Pondicherry University, Puducherry - 605014, India.

Abstract

Activated carbon derived from biomass has gained excited research attention due to their low cost, ease of availability and eco-friendly nature. In this work, we present hierarchical porous activated carbon derived from the leaves of Callistemon (Bottlebrush) plant through a simple KOH activation process. The material activated at temperature 700℃ possess enhanced BET surface area (SBET) of 925 m2/g. The activated carbon has been employed as electrode material for supercapacitor which showed promising specific capacitance of 283 F/g at a current density of 1 A/g. Cyclic stability studies revealed a retention of capacitance of 97%. Further adsorption studies were conducted using Methylene blue as dye and activated carbon as adsorbent. Adsorption efficiency was found to be 91.2% within one hour and the process was following Langmuir isotherm model. Kinetic studies revealed that the MB adsorption follows pseudo-second order kinetics. Thus, activated carbon derived from Callistemon can be employed as promising candidate for supercapacitor as well as dye removal applications.

Hierarchical Activated Porous Activated Carbon Derived from Callistemon Leaf Biochar for Supercapacitor and Methylene Blue Removal Applications