Rapid and efficient removal/recovery of molybdenum onto ZnFe2O4 nanoparticles

Yao Jen Tu; Ting Shan Chan; Hao Wei Tu; Shan Li Wang; Chen Feng You; Chien Kuei Chang

doi:10.1016/j.chemosphere.2016.01.054

Rapid and efficient removal/recovery of molybdenum onto ZnFe₂O₄ nanoparticles

Yao Jen Tu, Ting Shan Chan, Hao Wei Tu, Shan Li Wang, Chen Feng You, Chien Kuei Chang

Department of Earth Sciences

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

30 Citations (Scopus)

Abstract

An efficient method for removing and recovering molybdenum (Mo) from water was developed by using ZnFe₂O₄ nanoparticles. The Mo adsorption displayed a nonlinear isotherm that fitted well with the Langmuir isotherm, showing limited adsorption sites on the surface of ZnFe₂O₄. The adsorption of Mo(VI) was dependent on solution pH. With increasing pH, the build-up of negative charges of both adsorbent and adsorbate led to enhanced electric repulsion between them. The K-edge XANES spectra for the adsorbents collected after Mo adsorption revealed that Mo(VI) was the predominant oxidation state sorbed on ZnFe₂O₄, indicating that the reduction of Mo(VI) did not occur on ZnFe₂O₄. The different peak positions of k-space and R-space shown in K-edge EXAFS spectra demonstrated that the adsorbed Mo could be bound on the surface or be slipped in the vacancy position of the ZnFe₂O₄ crystal. Importantly, Mo could be efficiently adsorbed from photoelectric industrial wastewater and these adsorbed Mo anions were rapidly replaced by OH^- ions, implying the potential for Mo removing and recovering in industrial wastewater.

Original language	English
Pages (from-to)	452-458
Number of pages	7
Journal	Chemosphere
Volume	148
DOIs	https://doi.org/10.1016/j.chemosphere.2016.01.054
Publication status	Published - 2016 Apr 1

All Science Journal Classification (ASJC) codes

Environmental Engineering
Chemistry(all)
Environmental Chemistry
Pollution
Public Health, Environmental and Occupational Health
Health, Toxicology and Mutagenesis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.chemosphere.2016.01.054

Cite this

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title = "Rapid and efficient removal/recovery of molybdenum onto ZnFe2O4 nanoparticles",

abstract = "An efficient method for removing and recovering molybdenum (Mo) from water was developed by using ZnFe2O4 nanoparticles. The Mo adsorption displayed a nonlinear isotherm that fitted well with the Langmuir isotherm, showing limited adsorption sites on the surface of ZnFe2O4. The adsorption of Mo(VI) was dependent on solution pH. With increasing pH, the build-up of negative charges of both adsorbent and adsorbate led to enhanced electric repulsion between them. The K-edge XANES spectra for the adsorbents collected after Mo adsorption revealed that Mo(VI) was the predominant oxidation state sorbed on ZnFe2O4, indicating that the reduction of Mo(VI) did not occur on ZnFe2O4. The different peak positions of k-space and R-space shown in K-edge EXAFS spectra demonstrated that the adsorbed Mo could be bound on the surface or be slipped in the vacancy position of the ZnFe2O4 crystal. Importantly, Mo could be efficiently adsorbed from photoelectric industrial wastewater and these adsorbed Mo anions were rapidly replaced by OH- ions, implying the potential for Mo removing and recovering in industrial wastewater.",

author = "Tu, {Yao Jen} and Chan, {Ting Shan} and Tu, {Hao Wei} and Wang, {Shan Li} and You, {Chen Feng} and Chang, {Chien Kuei}",

note = "Funding Information: This research is sponsored by Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development . It is also supported by MOE (Grant No. 103-2611-M-006-002 ) and NCKU to CFY. The authors appreciate NSRRC staff for useful discussions and experimental support under the project of NSC103-2113-M-213-001. We also thank Prof. Jiang Wei-The, Mr. Lee Po-Shu, and Ms. Lin Chia-Yu for their supports on XRD and TEM analysis under the project of MOST103-2119-M006-004. Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

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AU - Tu, Yao Jen

AU - Chan, Ting Shan

AU - Tu, Hao Wei

AU - Wang, Shan Li

AU - You, Chen Feng

AU - Chang, Chien Kuei

N1 - Funding Information: This research is sponsored by Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development . It is also supported by MOE (Grant No. 103-2611-M-006-002 ) and NCKU to CFY. The authors appreciate NSRRC staff for useful discussions and experimental support under the project of NSC103-2113-M-213-001. We also thank Prof. Jiang Wei-The, Mr. Lee Po-Shu, and Ms. Lin Chia-Yu for their supports on XRD and TEM analysis under the project of MOST103-2119-M006-004. Publisher Copyright: © 2016 Elsevier Ltd.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - An efficient method for removing and recovering molybdenum (Mo) from water was developed by using ZnFe2O4 nanoparticles. The Mo adsorption displayed a nonlinear isotherm that fitted well with the Langmuir isotherm, showing limited adsorption sites on the surface of ZnFe2O4. The adsorption of Mo(VI) was dependent on solution pH. With increasing pH, the build-up of negative charges of both adsorbent and adsorbate led to enhanced electric repulsion between them. The K-edge XANES spectra for the adsorbents collected after Mo adsorption revealed that Mo(VI) was the predominant oxidation state sorbed on ZnFe2O4, indicating that the reduction of Mo(VI) did not occur on ZnFe2O4. The different peak positions of k-space and R-space shown in K-edge EXAFS spectra demonstrated that the adsorbed Mo could be bound on the surface or be slipped in the vacancy position of the ZnFe2O4 crystal. Importantly, Mo could be efficiently adsorbed from photoelectric industrial wastewater and these adsorbed Mo anions were rapidly replaced by OH- ions, implying the potential for Mo removing and recovering in industrial wastewater.

AB - An efficient method for removing and recovering molybdenum (Mo) from water was developed by using ZnFe2O4 nanoparticles. The Mo adsorption displayed a nonlinear isotherm that fitted well with the Langmuir isotherm, showing limited adsorption sites on the surface of ZnFe2O4. The adsorption of Mo(VI) was dependent on solution pH. With increasing pH, the build-up of negative charges of both adsorbent and adsorbate led to enhanced electric repulsion between them. The K-edge XANES spectra for the adsorbents collected after Mo adsorption revealed that Mo(VI) was the predominant oxidation state sorbed on ZnFe2O4, indicating that the reduction of Mo(VI) did not occur on ZnFe2O4. The different peak positions of k-space and R-space shown in K-edge EXAFS spectra demonstrated that the adsorbed Mo could be bound on the surface or be slipped in the vacancy position of the ZnFe2O4 crystal. Importantly, Mo could be efficiently adsorbed from photoelectric industrial wastewater and these adsorbed Mo anions were rapidly replaced by OH- ions, implying the potential for Mo removing and recovering in industrial wastewater.

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