Recovering magnetic Fe3O4-ZnO nanocomposites from algal biomass based on hydrophobicity shift under UV irradiation

Shijian Ge; Michael Agbakpe; Wen Zhang; Liyuan Kuang; Zhiyi Wu; Xianqin Wang

doi:10.1021/acsami.5b03472

Recovering magnetic Fe₃O₄-ZnO nanocomposites from algal biomass based on hydrophobicity shift under UV irradiation

Shijian Ge, Michael Agbakpe, Wen Zhang, Liyuan Kuang, Zhiyi Wu, Xianqin Wang

New Jersey Institute of Technology

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Magnetic separation, one of the promising bioseparation technologies, faces the challenges in recovery and reuse of magnetic agents during algal harvesting for biofuel extraction. This study synthesized a steric acid (SA)-coated Fe₃O₄-ZnO nanocomposite that could shift hydrophobicity under UV₃₆₅ irradiation. Our results showed that with the transition of surface hydrophobicity under UV₃₆₅ irradiation, magnetic nanocomposites detached from the concentrated algal biomass. The detachment was partially induced by the oxidation of SA coating layers due to the generation of radicals (e.g., ^•OH) by ZnO under UV₃₆₅ illumination. Consequently, the nanocomposite surface shifted from hydrophobic to hydrophilic, which significantly reduced the adhesion between magnetic particles and algae as predicted by the extended Derjaguin and Landau, Verwey, and Overbeek (EDLVO) theory. Such unique hydrophobicity shift may also find many other potential applications that require recovery, recycle, and reuse of valuable nanomaterials to increase sustainability and economically viability.

Original language	American English
Pages (from-to)	11677-11682
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	7
Issue number	21
DOIs	https://doi.org/10.1021/acsami.5b03472
State	Published - Jun 3 2015

ASJC Scopus subject areas

General Materials Science

Keywords

algal harvesting
biofuel
hydrophobicity
magnetic nanoparticles
magnetophoretic separation
microalgae

Access to Document

10.1021/acsami.5b03472

Cite this

@article{f53f988e11524babbd77f2c3de528b51,

title = "Recovering magnetic Fe3O4-ZnO nanocomposites from algal biomass based on hydrophobicity shift under UV irradiation",

abstract = "Magnetic separation, one of the promising bioseparation technologies, faces the challenges in recovery and reuse of magnetic agents during algal harvesting for biofuel extraction. This study synthesized a steric acid (SA)-coated Fe3O4-ZnO nanocomposite that could shift hydrophobicity under UV365 irradiation. Our results showed that with the transition of surface hydrophobicity under UV365 irradiation, magnetic nanocomposites detached from the concentrated algal biomass. The detachment was partially induced by the oxidation of SA coating layers due to the generation of radicals (e.g., •OH) by ZnO under UV365 illumination. Consequently, the nanocomposite surface shifted from hydrophobic to hydrophilic, which significantly reduced the adhesion between magnetic particles and algae as predicted by the extended Derjaguin and Landau, Verwey, and Overbeek (EDLVO) theory. Such unique hydrophobicity shift may also find many other potential applications that require recovery, recycle, and reuse of valuable nanomaterials to increase sustainability and economically viability.",

keywords = "algal harvesting, biofuel, hydrophobicity, magnetic nanoparticles, magnetophoretic separation, microalgae",

author = "Shijian Ge and Michael Agbakpe and Wen Zhang and Liyuan Kuang and Zhiyi Wu and Xianqin Wang",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = jun,

day = "3",

doi = "10.1021/acsami.5b03472",

language = "American English",

volume = "7",

pages = "11677--11682",

journal = "ACS Applied Materials and Interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

number = "21",

}

TY - JOUR

T1 - Recovering magnetic Fe3O4-ZnO nanocomposites from algal biomass based on hydrophobicity shift under UV irradiation

AU - Ge, Shijian

AU - Agbakpe, Michael

AU - Zhang, Wen

AU - Kuang, Liyuan

AU - Wu, Zhiyi

AU - Wang, Xianqin

PY - 2015/6/3

Y1 - 2015/6/3

N2 - Magnetic separation, one of the promising bioseparation technologies, faces the challenges in recovery and reuse of magnetic agents during algal harvesting for biofuel extraction. This study synthesized a steric acid (SA)-coated Fe3O4-ZnO nanocomposite that could shift hydrophobicity under UV365 irradiation. Our results showed that with the transition of surface hydrophobicity under UV365 irradiation, magnetic nanocomposites detached from the concentrated algal biomass. The detachment was partially induced by the oxidation of SA coating layers due to the generation of radicals (e.g., •OH) by ZnO under UV365 illumination. Consequently, the nanocomposite surface shifted from hydrophobic to hydrophilic, which significantly reduced the adhesion between magnetic particles and algae as predicted by the extended Derjaguin and Landau, Verwey, and Overbeek (EDLVO) theory. Such unique hydrophobicity shift may also find many other potential applications that require recovery, recycle, and reuse of valuable nanomaterials to increase sustainability and economically viability.

AB - Magnetic separation, one of the promising bioseparation technologies, faces the challenges in recovery and reuse of magnetic agents during algal harvesting for biofuel extraction. This study synthesized a steric acid (SA)-coated Fe3O4-ZnO nanocomposite that could shift hydrophobicity under UV365 irradiation. Our results showed that with the transition of surface hydrophobicity under UV365 irradiation, magnetic nanocomposites detached from the concentrated algal biomass. The detachment was partially induced by the oxidation of SA coating layers due to the generation of radicals (e.g., •OH) by ZnO under UV365 illumination. Consequently, the nanocomposite surface shifted from hydrophobic to hydrophilic, which significantly reduced the adhesion between magnetic particles and algae as predicted by the extended Derjaguin and Landau, Verwey, and Overbeek (EDLVO) theory. Such unique hydrophobicity shift may also find many other potential applications that require recovery, recycle, and reuse of valuable nanomaterials to increase sustainability and economically viability.

KW - algal harvesting

KW - biofuel

KW - hydrophobicity

KW - magnetic nanoparticles

KW - magnetophoretic separation

KW - microalgae

UR - http://www.scopus.com/inward/record.url?scp=84930663798&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84930663798&partnerID=8YFLogxK

U2 - 10.1021/acsami.5b03472

DO - 10.1021/acsami.5b03472

M3 - Article

C2 - 25965291

SN - 1944-8244

VL - 7

SP - 11677

EP - 11682

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 21

ER -