DoomsdaysCWMar 8

#GoldExtraction from #EWaste gets 10 times more efficient with new sponge material

Researchers developed a nanoscale cross-dimensional composite material via self-assembly of two-dimensional graphene oxide and one-dimensional chitosan macromolecules.

By Prabhat Ranjan Mishra, Oct 27, 2024

"Researchers have developed a new type of material that’s 10 times more efficient at extracting gold from e-waste than previous adsorbents. Developed by chemists and materials scientists at the National University of Singapore, the material is a type of sponge made of #GrapheneOxide and #chitosan [shrimp shells].

"The material can reportedly transform the way gold is extracted from electronic wastes, which has been described so far as a dirty business with low yields and results in toxic #pollutants.

"The cheaper, cleaner and efficient method was tested by researchers using real e-waste provided by a recycling company."

[...]

"While the present work focused on gold, the team say the technique could be adapted to recover other valuable metals such as #silver, #platinum or #palladium from #ElectronicWaste or even #mining residues. And that is not all: as well as e-waste, the technology might be applied to a wider range of environmental cleaning efforts, such as filtering out #HeavyMetals from #PollutedWater sources or industrial effluents, reported Physics World."

Read more:
https://interestingengineering.com/innovation/gold-extraction-from-e-waste-sponge


Article in Physics World - Eco-friendly graphene composite recovers gold from e-waste

24 Oct 2024

https://physicsworld.com/a/eco-friendly-graphene-composite-recovers-gold-from-e-waste/

#SolarPunkSunday #NoGoldMining
#EWasteRecycling #MetalsExtraction #Electronics #RareEarthMinerals #Recycling #NewTechnology #ShrimpShells

Gold extraction from e-waste gets 10x more efficient with new material

Developed by materials scientists at the National University of Singapore, the material is a type of sponge and 10 times more efficient at extracting gold from e-waste.

Interesting Engineering
Sepia FanFeb 3

dm Schaumfestiger ist nicht #vegan 😧

Ich hatte den letztens gekauft, weil ich eine Alternative zum Rossmann Schaumfestiger probieren wollte (ihr kennt das, wenn man hartnäckig das selbe Produkt kauft, wird es bald eingestellt).

Da es ebenso eine #Eigenmarke ist, hab ich ähnliche Zusammensetzung (mglw. gar selben Hersteller) erwartet.

Beim Austauschen fiel mir auf, daß der #Rossmann Schaumfestiger vegan ist und der von #dm … nicht O.o

#Codecheck offenbarte dann #Chitosan aus Garnelenschalen 🤢

Cytology and GeneticsMay 27, 2025
Chitosan-Based Hydrogels with N-Stearoylethanolamine for Acceleration of Healing of Acute Cutaneous Wounds: Cytological and Histological Examination - #chitosan #hydrogels #Nstearoylethanolamine #wounddressing #woundhealing #Cytology #Histology - https://link.springer.com/article/10.3103/S0095452725010086
Chitosan-Based Hydrogels with N-Stearoylethanolamine for Acceleration of Healing of Acute Cutaneous Wounds: Cytological and Histological Examination - Cytology and Genetics

Abstract Wound management remains a significant clinical challenge, necessitating the development of advanced biomaterial solutions. This study aimed to evaluate the wound-healing potential of novel hydrogel films based on chitosan, hyaluronic acid, and the cannabimimetic N-stearoylethanolamine (NSE). Morphological studies of the surface of hydrogels were carried out using scanning electron microscopy, the biocompatibility and biodegradability of the created samples were evaluated in vitro in mouse BALB-3T3 fibroblast using the MTT test and staining with neutral red. Acceleration of healing of model excisional wounds of the skin of C57/Black laboratory mice was assessed histologically and by evaluating the rates of wound area reduction. The hydrogels used in the study showed high biocompatibility, increased the migration of fibroblasts to the cell-free zone (hydrogel sample without NSE), and induced lysosomal activity, which may indicate the bioavailability of the studied samples. Both hydrogels accelerated wound healing in mice, with faster epithelialization and remodeling of wound tissues observed in histological sections. The hydrogel sample with the cannabimimetic NSE showed its effect in the late stages of wound healing, while the gel without NSE showed activity in all phases of wound healing.

SpringerLink
FMGVMay 16, 2025
https://www.chitin2025.org
9th #Iberoamerican #symposium on #chitin and #chitosan and 16th International #conference on chitin and chitosan, #biopolymers /#polymers of rocketing importance in the #sustainable #bioeconomy to be held in #hermosillo Mexico in October 2025. The event will span a broad range of topics, such as: #biomaterials, #analytical #characterisation #nanomaterials #glycoscience #enzymology #biomedicine #food #biotechnology #agriculture.
Early bird date: 13th July 2025.
scinexx - das wissensmagazinAug 19, 2024
Metallobjekte ohne Schmelzen und Pressen. Von Insekten abgeschautes Rezept ermöglicht maßgeschneiderte Metallverbundstoffe. #Metall #Materialforschung #Bionik #Chitosan
https://www.scinexx.de/news/technik/metallobjekte-ohne-schmelzen-und-pressen/
Metallobjekte ohne Schmelzen und Pressen

Von Krebsen und Insekten abgeschaut: Metallische Objekte lassen sich auch ohne energieintensive Schmelzöfen und Pressen erzeugen – nach dem Vorbild der

scinexx | Das Wissensmagazin
Ahasan AliAug 7, 2024

The #Chitosan Market was valued at USD 11.3 Billion in 2023 and is expected to grow at a strong CAGR of around 13.2% during the forecast period (2024-2032) owing to increasing demand for sustainable and biodegradable materials, advancements in water treatment technologies, and expanding applications in pharmaceuticals and biomedicine.

https://univdatos.com/report/chitosan-market/

Chitosan Market Size, Share, Growth | Forecast- 2032

The Chitosan Market was valued at USD 11.3 Billion in 2023 and is expected to grow at a strong CAGR of around 13.2% during the forecast period (2024-2032). Some of the major players operating in the market include KitoZyme S.A., Panvo Organics Pvt., Ltd., Heppe Medical Chitosan GmbH, KIMICA Corporation, Meron Biopolymers, Qingdao Yunzhou Biochemistry Co., ChitoLytic, Marshal Marine, BIO21 Co. Ltd, and Austanz Chitin Pty Ltd

Market Research Reporting & Analysis Agency in India
Fraunhofer IGBJun 24, 2024

Eine biobasierte Alternative aus #Chitosan kann PFAS ersetzen.

🕵️ Diese Woche berichten zwei der Forscher, Achim Weber und Thomas Hahn, im Blog #Biointelligenz über ihre Fortschritte.

🙌Neben weiteren Expertinnen und Experten kommen die beiden Forscher auch im Fraunhofer-Magazin 4/2023 zu Wort.

➡️ https://www.fraunhofer.de/s/ePaper/Magazin/2023/04/index.html#0

#fraunhofer #Biopolymer #PFAS

Fraunhofer-Magazin 4.2023

ePaper

🐦‍🔥nemo™🐦‍⬛ 🇺🇦🍉Mar 3, 2024

Recent #Advances in #Chitosan-Based Applications—A Review

https://www.mdpi.com/1996-1944/16/5/2073

link to the paper #openaccess

https://www.mdpi.com/1996-1944/16/5/2073/pdf?version=1678700515

Recent Advances in Chitosan-Based Applications—A Review

Chitosan derived from chitin has gathered much interest as a biopolymer due to its known and possible broad applications. Chitin is a nitrogen-enriched polymer abundantly present in the exoskeletons of arthropods, cell walls of fungi, green algae, and microorganisms, radulae and beaks of molluscs and cephalopods, etc. Chitosan is a promising candidate for a wide variety of applications due to its macromolecular structure and its unique biological and physiological properties, including solubility, biocompatibility, biodegradability, and reactivity. Chitosan and its derivatives have been known to be applicable in medicine, pharmaceuticals, food, cosmetics, agriculture, the textile and paper industries, the energy industry, and industrial sustainability. More specifically, their use in drug delivery, dentistry, ophthalmology, wound dressing, cell encapsulation, bioimaging, tissue engineering, food packaging, gelling and coating, food additives and preservatives, active biopolymeric nanofilms, nutraceuticals, skin and hair care, preventing abiotic stress in flora, increasing water availability in plants, controlled release fertilizers, dye-sensitised solar cells, wastewater and sludge treatment, and metal extraction. The merits and demerits associated with the use of chitosan derivatives in the above applications are elucidated, and finally, the key challenges and future perspectives are discussed in detail.

MDPI
PLOS BiologyJan 19, 2024
#Chitin deacetylases can produce custom chitosans with non-random GlcNAc & GlcN units. Identification of residues crucial for substrate binding enables engineering to drastically change the acetylation pattern of a #chitosan product #SynBio #PLOSBiology https://plos.io/48ZJPtn
Engineering of a chitin deacetylase to generate tailor-made chitosan polymers

Chitin deacetylases are a valuable tool for producing custom chitosans with non-random N-acetylglucosamine and glucosamine units. Analysis of a chitin deacetylase active site reveals residues crucial for substrate binding, allowing engineering to drastically change the acetylation pattern of a chitosan product.

PestinfoJan 3, 2024
The polysaccharide #chitosan is derived from arthropod cuticle, is non-toxic and biodegradable, and is used in many fields like medicine, pharmacy or cosmetics. It use for #insect #pest management is reviewed by Linda Abenaim and Barbara Conti - https://doi.org/10.3390/insects14120949
Chitosan as a Control Tool for Insect Pest Management: A Review

Chitosan, a polysaccharide derived from the deacetylation of chitin, is a versatile and eco-friendly biopolymer with several applications. Chitosan is recognized for its biodegradability, biocompatibility, and non-toxicity, beyond its antimicrobial, antioxidant, and antitumoral activities. Thanks to its properties, chitosan is used in many fields including medicine, pharmacy, cosmetics, textile, nutrition, and agriculture. This review focuses on chitosan’s role as a tool in insect pest control, particularly for agriculture, foodstuff, and public health pests. Different formulations, including plain chitosan, chitosan coating, chitosan with nematodes, chitosan’s modifications, and chitosan nanoparticles, are explored. Biological assays using these formulations highlighted the use of chitosan–essential oil nanoparticles as an effective tool for pest control, due to their enhanced mobility and essential oils’ prolonged release over time. Chitosan’s derivatives with alkyl, benzyl, and acyl groups showed good activity against insect pests due to improved solubility and enhanced activity compared to plain chitosan. Thus, the purpose of this review is to provide the reader with updated information concerning the use and potential applications of chitosan formulations as pest control tools.

MDPI