| Title |
Crayfish Waste-shells Integrated Valorization for Added Value Materials Production: Calcium Hydroxide, Calcium Carbonate, Chitin, Chitosan, and N-S co-doped Carbon Quantum Dots |
| ID_Doc |
15698 |
| Authors |
Salmas, CE; Georgopoulos, S; Leontiou, A; Sakavitsi, V; Cheilari, A; Kollia, E; Zaharioudakis, K; Ragkava, E; Karabagias, VK; Andritsos, ND; Konstantinou, I; Proestos, C; Kehayias, G; Giannakas, AE |
| Title |
Crayfish Waste-shells Integrated Valorization for Added Value Materials Production: Calcium Hydroxide, Calcium Carbonate, Chitin, Chitosan, and N-S co-doped Carbon Quantum Dots |
| Year |
2024 |
| Published |
|
| DOI |
10.1007/s12649-024-02559-4 |
| Abstract |
PurposeCrayfish treatment leads to the production of waste and byproducts up to 80% of the total initial seafood amount. The current common method to handle such waste is the landfilling practice which produces remarkable amounts of hazardous gasses and substances due to the anaerobic decomposition process. In this study, an integrated procedure is proposed for the valorization of wastes produced by a fish and crustaceous enterprise.MethodsAccording to the circular economy and environmentally friendly practices spirit, integrated vertical production and waste valorization methods are adopted globally to reduce food waste. In this study, a process consisting of four sequential steps was proposed to valorize crayfish-treatment waste. Four final added-value materials were produced during this study. The first was chitosan which was identified via the NMR technique exhibiting 91% deacetylation degree. The other two were calcium hydroxide particles of size 6.32 mu m and calcium carbonate particles of size 16.9 mu m exhibiting meso-macro-pore structure with Sg = 46m2/g and Sg = 20m2/g respectively. Pore specific surface area values of these two products are similar to values reported in the literature for applications such as drug carriers etc. The last product was nitrogen/sulfur-doped carbon quantum dots which exhibited an identified via AFM technique mean size of 5.01 nm. This material was successfully tested for its advanced antioxidant capabilities via the DPPH assay and for its antimicrobial properties via MIC routine measurements with E. coli and L. monocytogenes.ResultsExperimental data indicated that the valorization process proposed in this study could lead to a yield of 10% w/w for chitosan after three stages treatment, to a yield of 35% w/w for Ca(OH)2 or CaCO3 after 1 stage treatment, and to a yield of 5% w/w N-S co-dopped Carbon QDs.ConclusionThe globally big amount of waste-shells from Crayfish and other crustaceous could be integratedly exploited for added-value materials production yielding economic and environmental benefits. Crayfish waste shells are valorized.Integrated valorization of waste shells of crustaceous is feasible.Calcium carbonate and Calcium hydroxide powders exhibiting very good properties for different applications could be produced from waste shells valorization.High added value materials such as chitin and chitosan biopolymers could be produced from waste shells valorization.Advanced quantum dots such as nitrogen/sulfur dopped could be produced from waste shells valorization. |
| Author Keywords |
Integrated Valorization; Crayfish Waste Shells; Carbon Quantum Dots; Chitosan; Calcium Carbonate; Calcium Hydroxide |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001226905200001 |
| WoS Category |
Environmental Sciences |
| Research Area |
Environmental Sciences & Ecology |
| PDF |
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