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Adsorption of Brilliant Blue and Malachite Green by Nano‐graphene Exfoliated from Waste Batteries
Author(s) -
Karunanithi Bogeshwaran,
Kannaiyan Sathish Kumar,
Balakrishnan Karunanithi,
Muralidharan Srividhya,
Gopi Gowri
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202100213
Subject(s) - malachite green , graphene , adsorption , graphite , chemisorption , brilliant green , freundlich equation , chemical engineering , mesoporous material , materials science , nuclear chemistry , chemistry , organic chemistry , nanotechnology , catalysis , engineering
Waste graphite rods from waste batteries, acting as a source of graphite, were electrochemically exfoliated to synthesize graphene. Mesoporous graphene with a pore size of 14.81 Å and a surface area of 710.396 m 2 g −1 was chosen for adsorptive studies involving toxic dyes, Brilliant Blue (BB) and Malachite Green (MG), by varying the graphene dosage, contact period, temperature, pH, and the concentration of the dye solution. The maximum adsorption capacities reported were 120 mg g BB −1 and 342 mg g MG −1 , with dye removal rates of BB and MG greater than 99 and 98 %, respectively. Adsorption occurred as multilayer, following the Freundlich isotherm model, and the pseudo‐second‐order kinetic model fitted best, indicating chemisorption. Thermodynamic studies reveal an exothermic, spontaneous, and chemical adsorption.