Insights into acid-base properties of hydrotalcite materials during hydrothermal carbonization of sewage sludge

Based on proteins hydrolysis requiring alkaline conditions while polysaccharide hydrolysis requiring acidic conditions during hydrothermal carbonization (HTC) of sewage sludge (SS), different types of layered double oxides (LDOs) were introduced as catalysts to understand their role and structural alterations due to its containing acidic and basic sites. Results indicated that the structure of LDOs changes during HTC of SS with structural reconstruction influenced by properties of the aqueous phase, including anions and organic matter. As a result, the properties of the resulting hydrochar are also altered. Structural reconstruction of LDOs is a key factor that influences the HTC of SS. Basic sites of Mg/Al/Zn LDOs are slightly reduced, while acidic sites are remarkably enhanced, leading to an improvement in nitrogen removal and the recovery of organic matter from the HTC aqueous phase. © 2023

Authors
Tan Y. , Ma X. , Xu Z. , Zhang B. , Osman S.M. , Luque R.
Journal
Journal of the Energy Institute
Publisher
Elsevier B.V.
Language
English
State
Published
Link
External link
DOI
10.1016/J.JOEI.2023.101349
Number
101349
Volume
110
Year
2023
Organizations
  • 1 School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
  • 2 School of Energy and Environment, Southeast University, Jiangsu, Nanjing, 210096, China
  • 3 Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
  • 4 Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya str., Moscow, 117198, Russian Federation
  • 5 Universidad ECOTEC, Km. 13.5 Samborondón, Samborondón, EC092302, Ecuador
Keywords
Hydrothermal carbonization; Layered double hydroxides; Nitrogen removal; Sewage sludge
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