Multi-response optimization of the adsorption properties of activated carbon produced from H2SO4 activated sludge: Effects of washing with HCl

This study explores the valorization of sludge for producing activated carbon, recognized for its efficiency in removing textile dyes. Various analytical techniques were used to characterize sludge, biochar, H2SO4-activated carbon (HS), and H2SO4-activated carbon washed with HCl (HSC). The HSC sampl...

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Published inCase studies in chemical and environmental engineering Vol. 11; p. 101219
Main Authors Ben Ali, Majda, Benzaouak, Abdellah, Tangarfa, Mariam, Abrouki, Younes, Belekbir, Soukayna, hazzat, Mouatamid EL, El Hamidi, Adnane, Abdelouahed, Lokmane
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2025
Elsevier
Subjects
Activated carbon
Adsorption
Biochar
Chemical and Process Engineering
Engineering Sciences
Methylene blue
Response surface methodology
Sewage sludge
Response surface methodology
Adsorption
Biochar
Sewage sludge
Activated carbon
Methylene blue
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ISSN2666-0164
2666-0164
DOI10.1016/j.cscee.2025.101219

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Summary:This study explores the valorization of sludge for producing activated carbon, recognized for its efficiency in removing textile dyes. Various analytical techniques were used to characterize sludge, biochar, H2SO4-activated carbon (HS), and H2SO4-activated carbon washed with HCl (HSC). The HSC sample exhibited increased porosity, with a significant enhancement in specific surface area from 3.4 m2/g to 268.8 m2/g, along with increased pore volume. Adsorption kinetics followed a pseudo-first-order model for HS (Qe,exp = 82 mg/g) and a pseudo-second-order model for HSC (Qe,exp = 98.89 mg/g). These findings provide valuable insights into the potential application of these adsorbents for methylene blue removal.
ISSN:2666-0164
2666-0164
DOI:10.1016/j.cscee.2025.101219