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Effect of Citric Acid and Sodium Chloride on Characteristics of Sunflower Seed Shell‐Derived Activated Carbon
Author(s) -
Bahiraei Ayoob,
Behin Jamshid
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.202100117
Subject(s) - carbonization , activated carbon , citric acid , chemistry , mesoporous material , adsorption , sodium , decomposition , sunflower , specific surface area , carbon fibers , sodium hydroxide , carbonation , nuclear chemistry , inorganic chemistry , chemical engineering , materials science , catalysis , composite number , organic chemistry , engineering , composite material , mathematics , combinatorics
Micro‐ and mesoporous activated carbons (ACs) with ultrahigh surface area were synthesized from sunflower seed shells (SSS) by carbonization followed by KOH activation. The effects of citric acid (CA) in both carbonization and activation and of sodium chloride (NaCl) in the activation step were evaluated through the response surface method. Na atoms produced during activation can diffuse in the carbon texture and intensify the role of K atoms in expanding and creating new microporosity, whereas its combination with CA results in a significant proportion of mesopores. CA sequestrates metal ions and facilitates the decomposition of lignocellulosics, which prevents the formation of heavy tar blocking the pores. A high capacity for CO 2 adsorption was also observed for the NaCl‐activated sample which was higher than that reported previously.