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Photocatalytic degradation of methylene blue dye by zinc oxide nanoparticles obtained from precipitation and sol-gel methods.
Environ Sci Pollut Res Int. 2016 Dec; 23(24):25485-25493.ES

Abstract

Zinc oxide (ZnO) nanoparticles were synthesized by precipitation and sol-gel methods. The aim of this study was to understand how different synthetic methods can affect the photocatalytic activity of ZnO nanoparticles. As-synthesized ZnO nanoparticles were characterized by X-ray diffraction (XRD) and UV-Visible spectroscopic techniques. XRD patterns of ZnO powders synthesized by precipitation and sol-gel methods revealed their hexagonal wurtzite structure with crystallite sizes of 30 and 28 nm, respectively. Their photocatalytic activities were evaluated by photocatalytic degradation of methylene blue, a common water pollutant, under UV radiation. The effects of operational parameters such as photocatalyst load and initial concentration of the dye on photocatalytic degradation of methylene blue were investigated. While the degradation of dye decreased over the studied dye concentration range of 20 to 100 mg/L, an optimum photocatalyst load of 250 mg/L was needed to achieve dye degradation as high as 81 and 92.5 % for ZnO prepared by precipitation and sol-gel methods, respectively. Assuming pseudo first-order reaction kinetics, this corresponded to rate constants of 8.4 × 10-3 and 12.4 × 10-3 min-1, respectively. Hence, sol-gel method is preferred over precipitation method in order to achieve higher photocatalytic activity of ZnO nanostructures. Photocatalytic activity is further augmented by better choice of capping ligand for colloidal stabilization, starch being more effective than polyethylene glycol (PEG).

Authors+Show Affiliations

Chemistry Department, Haramaya University, Post Box 138, Dire Dawa, Ethiopia.Chemistry Department, Haramaya University, Post Box 138, Dire Dawa, Ethiopia.Department of Mechanical Engineering, Limerick Institute of Technology, Moylish Park Campus, Limerick, Ireland. taniadey@hotmail.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27704379

Citation

Balcha, Abebe, et al. "Photocatalytic Degradation of Methylene Blue Dye By Zinc Oxide Nanoparticles Obtained From Precipitation and Sol-gel Methods." Environmental Science and Pollution Research International, vol. 23, no. 24, 2016, pp. 25485-25493.
Balcha A, Yadav OP, Dey T. Photocatalytic degradation of methylene blue dye by zinc oxide nanoparticles obtained from precipitation and sol-gel methods. Environ Sci Pollut Res Int. 2016;23(24):25485-25493.
Balcha, A., Yadav, O. P., & Dey, T. (2016). Photocatalytic degradation of methylene blue dye by zinc oxide nanoparticles obtained from precipitation and sol-gel methods. Environmental Science and Pollution Research International, 23(24), 25485-25493. https://doi.org/10.1007/s11356-016-7750-6
Balcha A, Yadav OP, Dey T. Photocatalytic Degradation of Methylene Blue Dye By Zinc Oxide Nanoparticles Obtained From Precipitation and Sol-gel Methods. Environ Sci Pollut Res Int. 2016;23(24):25485-25493. PubMed PMID: 27704379.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic degradation of methylene blue dye by zinc oxide nanoparticles obtained from precipitation and sol-gel methods. AU - Balcha,Abebe, AU - Yadav,Om Prakash, AU - Dey,Tania, Y1 - 2016/10/04/ PY - 2016/02/14/received PY - 2016/09/18/accepted PY - 2016/10/6/pubmed PY - 2017/3/18/medline PY - 2016/10/6/entrez KW - Methylene blue KW - Photocatalyst KW - Pollutant degradation KW - XRD KW - Zinc oxide nanoparticle SP - 25485 EP - 25493 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 23 IS - 24 N2 - Zinc oxide (ZnO) nanoparticles were synthesized by precipitation and sol-gel methods. The aim of this study was to understand how different synthetic methods can affect the photocatalytic activity of ZnO nanoparticles. As-synthesized ZnO nanoparticles were characterized by X-ray diffraction (XRD) and UV-Visible spectroscopic techniques. XRD patterns of ZnO powders synthesized by precipitation and sol-gel methods revealed their hexagonal wurtzite structure with crystallite sizes of 30 and 28 nm, respectively. Their photocatalytic activities were evaluated by photocatalytic degradation of methylene blue, a common water pollutant, under UV radiation. The effects of operational parameters such as photocatalyst load and initial concentration of the dye on photocatalytic degradation of methylene blue were investigated. While the degradation of dye decreased over the studied dye concentration range of 20 to 100 mg/L, an optimum photocatalyst load of 250 mg/L was needed to achieve dye degradation as high as 81 and 92.5 % for ZnO prepared by precipitation and sol-gel methods, respectively. Assuming pseudo first-order reaction kinetics, this corresponded to rate constants of 8.4 × 10-3 and 12.4 × 10-3 min-1, respectively. Hence, sol-gel method is preferred over precipitation method in order to achieve higher photocatalytic activity of ZnO nanostructures. Photocatalytic activity is further augmented by better choice of capping ligand for colloidal stabilization, starch being more effective than polyethylene glycol (PEG). SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/27704379/Photocatalytic_degradation_of_methylene_blue_dye_by_zinc_oxide_nanoparticles_obtained_from_precipitation_and_sol_gel_methods_ L2 - https://dx.doi.org/10.1007/s11356-016-7750-6 DB - PRIME DP - Unbound Medicine ER -