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- Title
Green synthesis of Ag/lignin nanoparticle-loaded cellulose aerogel for catalytic degradation and antimicrobial applications.
- Authors
He, Xiao; Kim, Haeun; Dong, Tao G.; Gates, Ian; Lu, Qingye
- Abstract
Reacting with reductive phenolic hydroxyls (–OH) and methoxy groups (–OCH3) on lignin, silver ions (Ag+) were reduced to metallic silver nanoparticles (NPs) with sizes smaller than 40 nm. The resulting Ag/lignin NPs were then physically crosslinked in the cellulose hydrogel, followed by freeze-drying to obtain the final Ag/lignin NP-loaded cellulose aerogel. Loaded with Ag/lignin NPs, the aerogel exhibited strengthened mechanical property (387 ± 11 kPa) against the external deformation at a compressive strain of 65% due to the nano-reinforcement by the loaded Ag/lignin NPs when compared with pure cellulose aerogel (246 ± 32 kPa). The Ag/lignin NP-loaded aerogel also showed robust killing efficiency against different pathogenic bacteria in aqueous solution (Escherichia coli: > 99.99%, Pseudomonas aeruginosa: > 99.9%, Vibrio cholera: > 99.99%, Staphylococcus aureus: > 99.99%, Bacillus subtilis: > 97.4%). Moreover, the loaded Ag/lignin NPs provided the aerogel with excellent catalytic degradation ability toward various organic compounds, including dyes, pollutants, and antibiotics, evidenced by the degradation of methylene blue (99.8% in 30 min) and methyl orange (99.9% in 180 min) in the presence of NaBH4 and natural sunlight radiation, and degradation of rhodamine B (99.9% in 35 min), 4-nitrophenol (99.5% in 180 min) and doxycycline hyclate (99.8% in 30 min) in the presence of NaBH4 without natural sunlight. In addition, the Ag/lignin NP-loaded aerogel could be reused after facile regeneration washing with water while retaining excellent performance on efficiently degrading (~ 100%) the organic dyes for at least three cycles. The roles of loaded Ag/lignin NPs as photoelectron generators and relay centers for transferring electrons from the reductant to the targeted organic compounds during the degradation process were comprehensively investigated and explained.
- Subjects
AEROGELS; SILVER ions; CELLULOSE; LIGNINS; VIBRIO cholerae; METHOXY group; CELLULOSE chemistry; METHYLENE blue
- Publication
Cellulose, 2022, Vol 29, Issue 17, p9341
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-022-04848-4