Cargando…

Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell

The modification of inorganic surfaces with weak cationic polyelectrolytes by direct deposition through precipitation is a fast approach to generating composites with high numbers of functional groups. The core/shell composites present very good sorption capacity for heavy metal ions and negatively...

Descripción completa

Detalles Bibliográficos
Autores principales: Morosanu, Irina, Bucatariu, Florin, Fighir, Daniela, Paduraru, Carmen, Mihai, Marcela, Teodosiu, Carmen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10141894/
https://www.ncbi.nlm.nih.gov/pubmed/37112095
http://dx.doi.org/10.3390/polym15081948
_version_ 1785033484508594176
author Morosanu, Irina
Bucatariu, Florin
Fighir, Daniela
Paduraru, Carmen
Mihai, Marcela
Teodosiu, Carmen
author_facet Morosanu, Irina
Bucatariu, Florin
Fighir, Daniela
Paduraru, Carmen
Mihai, Marcela
Teodosiu, Carmen
author_sort Morosanu, Irina
collection PubMed
description The modification of inorganic surfaces with weak cationic polyelectrolytes by direct deposition through precipitation is a fast approach to generating composites with high numbers of functional groups. The core/shell composites present very good sorption capacity for heavy metal ions and negatively charged organic molecules from aqueous media. The sorbed amount of lead ions, used as a model for priority pollutants such as heavy metals, and diclofenac sodium salt, as an organic contaminant model for emerging pollutants, depended strongly on the organic content of the composite and less on the nature of contaminants, due to the different retention mechanisms (complexation vs. electrostatics/hydrophobics). Two experimental approaches were considered: (i) simultaneous adsorption of the two pollutants from a binary mixture and (ii) the sequential retention of each pollutant from monocomponent solutions. The simultaneous adsorption also considered process optimization by using the central composite design methodology to study the univariate effects of contact time and initial solution acidity with the purpose of enabling further practical applications in water/wastewater treatment. Sorbent regeneration after multiple sorption-desorption cycles was also investigated to assess its feasibility. Based on different non-linear regressions, the fitting of four isotherms (Langmuir, Freundlich, Hill, and Redlich–Peterson models) and three kinetics models (pseudo-first order (PFO), pseudo-second order (PSO), and two-compartment first order (TC)) has been carried out. The best agreement with experiments was found for the Langmuir isotherm and the PFO kinetic model. Silica/polyelectrolytes with a high number of functional groups may be considered efficient and versatile sorbents that can be used in wastewater treatment processes.
format Online
Article
Text
id pubmed-10141894
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-101418942023-04-29 Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell Morosanu, Irina Bucatariu, Florin Fighir, Daniela Paduraru, Carmen Mihai, Marcela Teodosiu, Carmen Polymers (Basel) Article The modification of inorganic surfaces with weak cationic polyelectrolytes by direct deposition through precipitation is a fast approach to generating composites with high numbers of functional groups. The core/shell composites present very good sorption capacity for heavy metal ions and negatively charged organic molecules from aqueous media. The sorbed amount of lead ions, used as a model for priority pollutants such as heavy metals, and diclofenac sodium salt, as an organic contaminant model for emerging pollutants, depended strongly on the organic content of the composite and less on the nature of contaminants, due to the different retention mechanisms (complexation vs. electrostatics/hydrophobics). Two experimental approaches were considered: (i) simultaneous adsorption of the two pollutants from a binary mixture and (ii) the sequential retention of each pollutant from monocomponent solutions. The simultaneous adsorption also considered process optimization by using the central composite design methodology to study the univariate effects of contact time and initial solution acidity with the purpose of enabling further practical applications in water/wastewater treatment. Sorbent regeneration after multiple sorption-desorption cycles was also investigated to assess its feasibility. Based on different non-linear regressions, the fitting of four isotherms (Langmuir, Freundlich, Hill, and Redlich–Peterson models) and three kinetics models (pseudo-first order (PFO), pseudo-second order (PSO), and two-compartment first order (TC)) has been carried out. The best agreement with experiments was found for the Langmuir isotherm and the PFO kinetic model. Silica/polyelectrolytes with a high number of functional groups may be considered efficient and versatile sorbents that can be used in wastewater treatment processes. MDPI 2023-04-19 /pmc/articles/PMC10141894/ /pubmed/37112095 http://dx.doi.org/10.3390/polym15081948 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Morosanu, Irina
Bucatariu, Florin
Fighir, Daniela
Paduraru, Carmen
Mihai, Marcela
Teodosiu, Carmen
Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title_full Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title_fullStr Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title_full_unstemmed Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title_short Optimization of Lead and Diclofenac Removal from Aqueous Media Using a Composite Sorbent of Silica Core and Polyelectrolyte Coacervate Shell
title_sort optimization of lead and diclofenac removal from aqueous media using a composite sorbent of silica core and polyelectrolyte coacervate shell
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10141894/
https://www.ncbi.nlm.nih.gov/pubmed/37112095
http://dx.doi.org/10.3390/polym15081948
work_keys_str_mv AT morosanuirina optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell
AT bucatariuflorin optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell
AT fighirdaniela optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell
AT padurarucarmen optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell
AT mihaimarcela optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell
AT teodosiucarmen optimizationofleadanddiclofenacremovalfromaqueousmediausingacompositesorbentofsilicacoreandpolyelectrolytecoacervateshell