Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles
In this paper, we present a study on the adsorption of calcium (Ca2+) onto polyacrylic acid-functionalized iron-oxide magnetic nanoparticles (PAA-MNPs) to gain an insight into the adsorption behavior of alkaline earth elements at conditions typical of produced water from hydraulic fracturing. An aqu...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2017-02-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/10/2/223 |
| _version_ | 1811263512283971584 |
|---|---|
| author | Qing Wang Valentina Prigiobbe Chun Huh Steven L. Bryant |
| author_facet | Qing Wang Valentina Prigiobbe Chun Huh Steven L. Bryant |
| author_sort | Qing Wang |
| collection | DOAJ |
| description | In this paper, we present a study on the adsorption of calcium (Ca2+) onto polyacrylic acid-functionalized iron-oxide magnetic nanoparticles (PAA-MNPs) to gain an insight into the adsorption behavior of alkaline earth elements at conditions typical of produced water from hydraulic fracturing. An aqueous co-precipitation method was employed to fabricate iron oxide magnetic nanoparticles, whose surface was first coated with amine and then by PAA. To evaluate the Ca2+ adsorption capacity by PAA-MNPs, the Ca2+ adsorption isotherm was measured in batch as a function of pH and sodium chlorite (electrolyte) concentration. A surface complexation model accounting for the coulombic forces in the diffuse double layer was developed to describe the competitive adsorption of protons (H+) and Ca2+ onto the anionic carboxyl ligands of the PAA-MNPs. Measurements show that Ca2+ adsorption is significant above pH 5 and decreases with the electrolyte concentration. Upon adsorption, the nanoparticle suspension destabilizes and creates large clusters, which favor an efficient magnetic separation of the PAA-MNPs, therefore, helping their recovery and recycle. The model agrees well with the experiments and predicts that the maximum adsorption capacity can be achieved within the pH range of the produced water, although that maximum declines with the electrolyte concentration. |
| first_indexed | 2024-04-12T19:46:43Z |
| format | Article |
| id | doaj.art-a266a1899c6c46b6ad51f7ee7b4e49da |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T19:46:43Z |
| publishDate | 2017-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a266a1899c6c46b6ad51f7ee7b4e49da2022-12-22T03:18:57ZengMDPI AGEnergies1996-10732017-02-0110222310.3390/en10020223en10020223Alkaline Earth Element Adsorption onto PAA-Coated Magnetic NanoparticlesQing Wang0Valentina Prigiobbe1Chun Huh2Steven L. Bryant3Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USADepartment of Civil, Environmental, and Ocean Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USADepartment of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USADepartment of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, CanadaIn this paper, we present a study on the adsorption of calcium (Ca2+) onto polyacrylic acid-functionalized iron-oxide magnetic nanoparticles (PAA-MNPs) to gain an insight into the adsorption behavior of alkaline earth elements at conditions typical of produced water from hydraulic fracturing. An aqueous co-precipitation method was employed to fabricate iron oxide magnetic nanoparticles, whose surface was first coated with amine and then by PAA. To evaluate the Ca2+ adsorption capacity by PAA-MNPs, the Ca2+ adsorption isotherm was measured in batch as a function of pH and sodium chlorite (electrolyte) concentration. A surface complexation model accounting for the coulombic forces in the diffuse double layer was developed to describe the competitive adsorption of protons (H+) and Ca2+ onto the anionic carboxyl ligands of the PAA-MNPs. Measurements show that Ca2+ adsorption is significant above pH 5 and decreases with the electrolyte concentration. Upon adsorption, the nanoparticle suspension destabilizes and creates large clusters, which favor an efficient magnetic separation of the PAA-MNPs, therefore, helping their recovery and recycle. The model agrees well with the experiments and predicts that the maximum adsorption capacity can be achieved within the pH range of the produced water, although that maximum declines with the electrolyte concentration.http://www.mdpi.com/1996-1073/10/2/223adsorptioncalciumfunctionalized superparamagnetic iron oxide nanoparticlespolyacrylic acidsurface complexation modelling |
| spellingShingle | Qing Wang Valentina Prigiobbe Chun Huh Steven L. Bryant Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles Energies adsorption calcium functionalized superparamagnetic iron oxide nanoparticles polyacrylic acid surface complexation modelling |
| title | Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles |
| title_full | Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles |
| title_fullStr | Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles |
| title_full_unstemmed | Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles |
| title_short | Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles |
| title_sort | alkaline earth element adsorption onto paa coated magnetic nanoparticles |
| topic | adsorption calcium functionalized superparamagnetic iron oxide nanoparticles polyacrylic acid surface complexation modelling |
| url | http://www.mdpi.com/1996-1073/10/2/223 |
| work_keys_str_mv | AT qingwang alkalineearthelementadsorptionontopaacoatedmagneticnanoparticles AT valentinaprigiobbe alkalineearthelementadsorptionontopaacoatedmagneticnanoparticles AT chunhuh alkalineearthelementadsorptionontopaacoatedmagneticnanoparticles AT stevenlbryant alkalineearthelementadsorptionontopaacoatedmagneticnanoparticles |