Extraction and characterization of chitin and chitosan: applications of chitosan nanoparticles in the adsorption of copper in an aqueous environment

e-Polymers ◽  
2017 ◽  
Vol 17 (5) ◽  
pp. 383-397 ◽  
Author(s):  
Oumkelthoum Rahmani ◽  
Bachir Bouzid ◽  
Abdenacer Guibadj
Keyword(s):  
Chitosan Nanoparticles ◽  
Aqueous Environment ◽  
Order Model ◽  
Freundlich Model ◽  
Composite Beads ◽  
Chitin And Chitosan ◽  
New Generation ◽  
Purification Of Water ◽  
Porous Bead

AbstractThe main objective of the present work is to develop and characterize a new generation of adsorptive gelled porous bead supports made from nanoparticles of chitosan, bentonite and alginate. There were subsequently used in the purification of water synthetically polluted with cupric ions. The multiple experiments carried out on the adsorption of copper resulted in an equilibrium time reached after 10 min with an elimination percentage of 86%. Adsorption kinetics is better described by the expression of the second-order model whereas the adsorption isotherm is satisfactorily described by the Freundlich model. The different results showed the high affinity of the nanoparticle composite beads of chitosan/bentonite/alginate to cupric ions in an aqueous solution which is probably due to the presence of various chelating agents such as “NH, OH, COO−, and O” in their structure.

Optimization and Physicochemical Characterization of Chitosan and Chitosan Nanoparticles Extracted from the Crayfish Procambarus clarkii Wastes

2019 ◽  
Vol 38 (2) ◽  
pp. 385 ◽  
Author(s):  
Marwa M. El-Naggar ◽  
Wael S. I. Abou-Elmagd ◽  
Ashraf Suloma ◽  
Hamza A. El-Shabaka ◽  
Magdy T. Khalil ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Chitosan Nanoparticles ◽  
Physicochemical Characterization

DEVELOPMENT AND CHARACTERIZATION OF CHITOSAN NANOPARTICLES LOADED NANOFIBER HYBRID SYSTEM FOR VAGINAL CONTROLLED RELEASE OF BENZYDAMINE

2021 ◽  
pp. 105801
Author(s):  
Fatmanur Tuğcu-Demiröz ◽  
Sinem Saar ◽  
Adnan Altuğ Kara ◽  
Ayşegül Yıldız ◽  
Emre Tunçel ◽  
...  
Keyword(s):  
Controlled Release ◽  
Hybrid System ◽  
Chitosan Nanoparticles

scholarly journals Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1513
Author(s):  
Yuezhou Wei ◽  
Khalid A. M. Salih ◽  
Mohammed F. Hamza ◽  
Toyohisa Fujita ◽  
Enrique Rodríguez-Castellón ◽  
...  
Keyword(s):  
High Tech ◽  
Low Grade ◽  
Acid Solutions ◽  
Hydrogel Beads ◽  
Secondary Sources ◽  
Composite Sorbents ◽  
Synthesis Procedure ◽  
New Generation ◽  
Mild Acid

High-tech applications require increasing amounts of rare earth elements (REE). Their recovery from low-grade minerals and their recycling from secondary sources (as waste materials) are of critical importance. There is increasing attention paid to the development of new sorbents for REE recovery from dilute solutions. A new generation of composite sorbents based on brown algal biomass (alginate) and polyethylenimine (PEI) was recently developed (ALPEI hydrogel beads). The phosphorylation of the beads strongly improves the affinity of the sorbents for REEs (such as La and Tb): by 4.5 to 6.9 times compared with raw beads. The synthesis procedure (epicholorhydrin-activation, phosphorylation and de-esterification) is investigated by XPS and FTIR for characterizing the grafting route but also for interpreting the binding mechanism (contribution of N-bearing from PEI, O-bearing from alginate and P-bearing groups). Metal ions can be readily eluted using an acidic calcium chloride solution, which regenerates the sorbent: the FTIR spectra are hardly changed after five successive cycles of sorption and desorption. The materials are also characterized by elemental, textural and thermogravimetric analyses. The phosphorylation of ALPEI beads by this new method opens promising perspectives for the recovery of these strategic metals from mild acid solutions (i.e., pH ~ 4).

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