11 research outputs found
Inductively coupled plasma-mass spectrometry in biodistribution studies of (engineered) nanoparticles
Cooperative catalysis of cellulose nanofiber and organocatalyst in direct aldol reactions
Selective hydrogenation of phenol to cyclohexanone catalyzed by palladium nanoparticles supported on alumina/lanthanide oxides
Direct Synthesis of Novel and Reactive Sulfide-modified Nano Iron through Nanoparticle Seeding for Improved Cadmium-Contaminated Water Treatment
Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) is of great technical and scientific interest because of its promising application in groundwater remediation, although its synthesis is still a challenge. We develop a new nanoparticle seeding method to obtain a novel and reactive nanohybrid, which contains an Fe(0) core covered by a highly sulfidized layer under high extent of sulfidation. Syntheses monitoring experiments show that seeding accelerates the reduction rate from Fe(2+) to Fe(0) by 19%. X-ray adsorption near edge structure (XANES) spectroscopy and extended X-ray absorption fine structure analyses demonstrate the hexahedral Fe-Fe bond (2.45 and 2.83 Å) formation through breaking down of the 1.99 Å Fe-O bond both in crystalline and amorphous iron oxide. The XANES analysis also shows 24.2% (wt%) of FeS with bond length of 2.4 Å in final nanohybrid. Both X-ray diffraction and Mössbauer analyses further confirm that increased nanoparticle seeding results in formation of more Fe(0) crystals. Nano-SiO(2) seeding brings down the size of single Fe(0) grain from 32.4 nm to 18.7 nm, enhances final Fe(0) content from 5.9% to 55.6%, and increases magnetization from 4.7 to 65.5 emu/g. The synthesized nanohybrid has high cadmium removal capacity and holds promising prospects for treatment of metal-contaminated water
Synthesis, characterization, and debromination reactivity of cellulose-stabilized Pd/Fe nanoparticles for 2,2',4,4'-tretrabromodiphenyl ether
Amine functionalization of cellulose nanocrystals for acid–base organocatalysis: surface chemistry, cross-linking, and solvent effects
Calix[4]pyrrole Stabilized PdNPs as an Efficient Heterogeneous Catalyst for Enhanced Degradation of Water-Soluble Carcinogenic Azo Dyes
Synthesis of a Cellulosic Pd(salen)-Type Catalytic Complex as a Green and Recyclable Catalyst for Cross-Coupling Reactions
Biological synthesis of metallic nanoparticles: plants, animals and microbial aspects
The green synthesis (GS) of different metallic nanoparticles (MNPs) has re-evaluated plants, animals and microorganisms for their natural potential to reduce metallic ions into neutral atoms at no expense of toxic and hazardous chemicals. Contrary to chemically synthesized MNPs, GS offers advantages of enhanced biocompatibility and thus has better scope for biomedical applications. Plant, animals and microorganisms belonging to lower and higher taxonomic groups have been experimented for GS of MNPs, such as gold (Au), silver (Ag), copper oxide (CuO), zinc oxide (ZnO), iron (Fe2O3), palladium (Pd), platinum (Pt), nickel oxide (NiO) and magnesium oxide (MgO). Among the different plant groups used for GS, angiosperms and algae have been explored the most with great success. GS with animal-derived biomaterials, such as chitin, silk (sericin, fibroin and spider silk) or cell extract of invertebrates have also been reported. Gram positive and gram negative bacteria, different fungal species and virus particles have also shown their abilities in the reduction of metal ions. However, not a thumb rule, most of the reducing agents sourced from living world also act as capping agents and render MNPs less toxic or more biocompatible. The most unexplored area so far in GS is the mechanism studies for different natural reducing agents expect for few of them, such as tea and neem plants. This review encompasses the recent advances in the GS of MNPs using plants, animals and microorganisms and analyzes the key points and further discusses the pros and cons of GS in respect of chemical synthesis.Fil: Das, Ratul Kumar. UniversitĂ© du QuĂ©bec a Montreal; Canadá. The Energy and Resources Institute; IndiaFil: Pachapur, Vinayak Laxman. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: Lonappan, Linson. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: Naghdi, Mitra. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: Pulicharla, Rama. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: Maiti, Sampa. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: CledĂłn, Maximiliano. UniversitĂ© du QuĂ©bec a Montreal; Canadá. Universidad Nacional del Comahue. Centro de InvestigaciĂłn Aplicada y Transferencia TecnolĂłgica en Recursos Marinos "Almirante Storni". - Provincia de RĂo Negro. Ministerio de Agricultura, GanaderĂa y Pesca. Centro de InvestigaciĂłn Aplicada y Transferencia TecnolĂłgica en Recursos Marinos "Almirante Storni". - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Centro Nacional PatagĂłnico. Centro de InvestigaciĂłn Aplicada y Transferencia TecnolĂłgica en Recursos Marinos "Almirante Storni"; ArgentinaFil: Dalila, Larios Martinez Araceli. UniversitĂ© du QuĂ©bec a Montreal; CanadáFil: Sarma, Saurabh Jyoti. University of Calgary; CanadáFil: Brar, Satinder Kaur. UniversitĂ© du QuĂ©bec a Montreal; Canad