Investigation of the Use of Phosphate and Amine Modified Enhanced Ca-Alginate Spheres in Lanthanum and Cerium Adsorption

Project no. 32318 · Status: Kapanmış (Yayın bekleniyor) · 2024

Summary

<p>The&nbsp;development&nbsp;of&nbsp;new,&nbsp;environmentally&nbsp;friendly,&nbsp;economical,&nbsp;and&nbsp;easy-to-use&nbsp;materials&nbsp;for&nbsp;the&nbsp;recovery&nbsp;and&nbsp;separation&nbsp;of&nbsp;rare&nbsp;earth&nbsp;elements,&nbsp;whose&nbsp;importance&nbsp;is&nbsp;increasing&nbsp;day&nbsp;by&nbsp;day,&nbsp;is&nbsp;of&nbsp;great&nbsp;importance.&nbsp;In&nbsp;this&nbsp;context,&nbsp;alginates,&nbsp;a&nbsp;natural&nbsp;and&nbsp;economical&nbsp;material,&nbsp;yield&nbsp;successful&nbsp;results,&nbsp;especially&nbsp;when&nbsp;used&nbsp;in&nbsp;combination&nbsp;with&nbsp;complexing&nbsp;agents,&nbsp;in&nbsp;the&nbsp;removal&nbsp;of&nbsp;heavy&nbsp;metals.</p><p></p><p>This&nbsp;project&nbsp;aims&nbsp;to&nbsp;synthesize&nbsp;alginate&nbsp;microspheres&nbsp;containing&nbsp;phosphate&nbsp;amine&nbsp;functional&nbsp;groups&nbsp;for&nbsp;the&nbsp;removal&nbsp;of&nbsp;lanthanum&nbsp;and&nbsp;cerium,&nbsp;rare&nbsp;earth&nbsp;elements,&nbsp;from&nbsp;aqueous&nbsp;solutions.&nbsp;The&nbsp;synthesis&nbsp;process&nbsp;will&nbsp;be&nbsp;carried&nbsp;out&nbsp;by&nbsp;forming&nbsp;amide&nbsp;bonds&nbsp;with&nbsp;2-aminoethyl&nbsp;dihydrogen&nbsp;phosphate&nbsp;and&nbsp;ethylenediamine&nbsp;molecules&nbsp;to&nbsp;the&nbsp;carboxyl&nbsp;groups&nbsp;on&nbsp;the&nbsp;alginate.&nbsp;Modification&nbsp;will&nbsp;be&nbsp;performed&nbsp;using&nbsp;two&nbsp;different&nbsp;approaches:&nbsp;during&nbsp;and&nbsp;after&nbsp;synthesis.</p><p></p><p>The&nbsp;characterization&nbsp;of&nbsp;the&nbsp;obtained&nbsp;products&nbsp;will&nbsp;be&nbsp;carried&nbsp;out&nbsp;using&nbsp;SEM-EDX,&nbsp;FT-IR,&nbsp;surface&nbsp;area&nbsp;and&nbsp;porosity&nbsp;testing,&nbsp;and&nbsp;XPS&nbsp;methods.&nbsp;In&nbsp;the&nbsp;batch&nbsp;method&nbsp;of&nbsp;lanthanum&nbsp;and&nbsp;cerium&nbsp;adsorption;&nbsp;Studies&nbsp;will&nbsp;be&nbsp;conducted&nbsp;to&nbsp;determine&nbsp;the&nbsp;separation&nbsp;factors&nbsp;of&nbsp;the&nbsp;alginate&nbsp;microspheres,&nbsp;including&nbsp;initial&nbsp;pH,&nbsp;initial&nbsp;concentration,&nbsp;shaking&nbsp;time,&nbsp;temperature,&nbsp;desorption,&nbsp;matrix&nbsp;ion&nbsp;effect,&nbsp;and&nbsp;other&nbsp;rare&nbsp;earth&nbsp;elements.&nbsp;Using&nbsp;the&nbsp;obtained&nbsp;data,&nbsp;their&nbsp;suitability&nbsp;for&nbsp;basic&nbsp;adsorption&nbsp;models&nbsp;such&nbsp;as&nbsp;Langmuir,&nbsp;Dubinin–Radushkevich&nbsp;(D-R),&nbsp;and&nbsp;Freundlich&nbsp;will&nbsp;be&nbsp;examined.&nbsp;Standard&nbsp;enthalpy,&nbsp;standard&nbsp;entropy,&nbsp;and&nbsp;Gibbs&nbsp;free&nbsp;energy&nbsp;values&nbsp;​​will&nbsp;be&nbsp;determined&nbsp;based&nbsp;on&nbsp;the&nbsp;results&nbsp;of&nbsp;temperature&nbsp;experiments&nbsp;to&nbsp;determine&nbsp;thermodynamic&nbsp;parameters.</p><p></p><p>Literature&nbsp;research&nbsp;revealed&nbsp;no&nbsp;extensive&nbsp;literature&nbsp;on&nbsp;the&nbsp;synthesis&nbsp;of&nbsp;alginate&nbsp;microspheres&nbsp;modified&nbsp;with&nbsp;the&nbsp;aforementioned&nbsp;molecules&nbsp;and&nbsp;the&nbsp;investigation&nbsp;of&nbsp;lanthanum&nbsp;and&nbsp;cerium&nbsp;adsorption.&nbsp;Furthermore,&nbsp;no&nbsp;studies&nbsp;involving&nbsp;the&nbsp;formation&nbsp;of&nbsp;amide&nbsp;bonds&nbsp;and&nbsp;subsequent&nbsp;modification&nbsp;of&nbsp;alginate&nbsp;microspheres&nbsp;were&nbsp;found.&nbsp;Therefore,&nbsp;this&nbsp;proposed&nbsp;project&nbsp;will&nbsp;provide&nbsp;a&nbsp;unique&nbsp;contribution.</p><p></p><p>We&nbsp;believe&nbsp;that&nbsp;the&nbsp;realization&nbsp;of&nbsp;this&nbsp;project&nbsp;will&nbsp;make&nbsp;a&nbsp;significant&nbsp;contribution&nbsp;to&nbsp;the&nbsp;scientific&nbsp;literature&nbsp;and&nbsp;will&nbsp;help&nbsp;in&nbsp;the&nbsp;effective&nbsp;utilization&nbsp;of&nbsp;national&nbsp;resources.</p>

View details