Scavenging of DPPH by Persistent Free Radicals in Carbonized Particles

Adolfsson, Karin H.KTH,Polymerteknologi,KTH Royal Inst Technol, Dept Fibre & Polymer Technol, S-10044 Stockholm, Sweden. (författare)

QC 20230626
Persistent free radicals (PFR) in carbonized particles may play a role in degradation of environmental compounds. The influence of PFR is evaluated in various carbonized particles on their radical scavenging efficiency upon the common radical indicator 2-2-diphenyl-1-picrylhydrazyl (DPPH). Carbonized particles are derived by hydrothermal carbonization of glucose (C-W) or glucose and urea (NC-W) and ionothermal carbonization of glucose and urea ionic liquid (IL) (NC-IL). The carbonized materials contain OH/COOH, C=C, and C-O functionalities. The addition of urea introduces NH/NH2 functionalities. The content of polar surface groups is lower in IL-processed NC-IL. The scavenging ability, measured as DPPH UV–vis absorption decline, increases with concentration and time for all particles, while the efficiency changes are in the order of C-W > NC-W > NC-IL. Electron paramagnetic resonance analysis reveals similar radical concentration in all carbonized materials studied. The difference in efficiency is, thus, not directly related to the PFR concentration but rather to the type of PFR, surface functionalities and/or scavenging mechanism. According to the g-values, radicals in these particles are carbon-centered. The minor variation in g-values suggests interactions between the radicals and their environmental functional groups. This provides insights into the influence of PFR in carbonized materials on their radical scavenging efficiency.

Huang, PingUppsala universitet,Molekylär biomimetik(Swepub:uu)pihua498 (författare)
Golda-Cepa, MonikaFaculty of Chemistry, Jagiellonian Universityul, Krakow, 30–387, Poland,Jagiellonian Univ, Fac Chem, PL-30387 Krakow, Poland. (författare)
Xu, HuanSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China,China Univ Min & Technol, Sch Mat Sci & Phys, Xuzhou 221116, Peoples R China. (författare)
Kotarba, AndrzejFaculty of Chemistry, Jagiellonian Universityul, Krakow, 30–387, Poland,Jagiellonian Univ, Fac Chem, PL-30387 Krakow, Poland. (författare)
Hakkarainen, MinnaKTH,Polymerteknologi,KTH Royal Inst Technol, Dept Fibre & Polymer Technol, S-10044 Stockholm, Sweden.(Swepub:kth)u14e229n (författare)
KTHPolymerteknologi (creator_code:org_t)

Av författaren/redakt...: Adolfsson, Karin ...; Huang, Ping; Golda-Cepa, Moni ...; Xu, Huan; Kotarba, Andrzej; Hakkarainen, Min ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Polymerteknologi

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