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Article

Micro-Plasma Assisted Synthesis of ZnO Nanosheets for the Efficient Removal of Cr6+ from the Aqueous Solution

by
Pawan Kumar
1,*,
Meenu Saini
1,*,
Maninder Singh
2,
Nidhi Chhillar
3,
Brijnandan S. Dehiya
1,
Kamal Kishor
4,
Fahad A. Alharthi
5,
Nabil Al-Zaqri
5 and
Abdulaziz Ali Alghamdi
5
1
Department of Materials Science and Nanotechnology, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, India
2
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, India
3
University School of Environment Management, Guru Gobind Singh Indraprastha University, Sec 16 C Dwarka, Delhi 110078, India
4
Department of Applied Physics, Delhi Technical University, Main Bawana Road, New Delhi 110042, India
5
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Crystals 2021, 11(1), 2; https://doi.org/10.3390/cryst11010002
Submission received: 9 November 2020 / Revised: 8 December 2020 / Accepted: 10 December 2020 / Published: 22 December 2020
(This article belongs to the Special Issue Functional Nanomaterials for Advanced Applications)
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Abstract

Herein, we report a micro-plasma assisted solvothermal synthesis and characterization of zinc oxide nanosheets (ZnO-NSs) and their application for the removal of Cr6+ ion from aqueous solution. The morphological investigations by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed the high-density growth of nanosheets with the typical sizes in the range of 145.8–320.25 nm. The typical surface area of the synthesized ZnO-NSs, observed by Brunauer-Emmett-Teller (BET), was found to be 948 m2/g. The synthesized ZnO-NSs were used as efficient absorbent for the removal of Cr6+ ion from aqueous solution. Various parameters such as pH, contact time, amount of adsorbate and adsorbent on the removal efficiency of Cr6+ ion was optimized and presented in this paper. At optimized conditions, the highest value for removal was 87.1% at pH = 2 while the calculated maximum adsorption capacity was ~87.37 mg/g. The adsorption isotherm data were found to be best fitted to Temkin adsorption isotherm and the adsorption process followed the pseudo-first-order kinetics. Furthermore, the toxicity of ZnO-NSs were also examined against fibroblast cells, which show favorable results and proved that it can be used for wastewater treatment.
Keywords: ZnO nanosheets; Cr(VI) ion; adsorption isotherms; fibroblast cells ZnO nanosheets; Cr(VI) ion; adsorption isotherms; fibroblast cells

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MDPI and ACS Style

Kumar, P.; Saini, M.; Singh, M.; Chhillar, N.; S. Dehiya, B.; Kishor, K.; Alharthi, F.A.; Al-Zaqri, N.; Ali Alghamdi, A. Micro-Plasma Assisted Synthesis of ZnO Nanosheets for the Efficient Removal of Cr6+ from the Aqueous Solution. Crystals 2021, 11, 2. https://doi.org/10.3390/cryst11010002

AMA Style

Kumar P, Saini M, Singh M, Chhillar N, S. Dehiya B, Kishor K, Alharthi FA, Al-Zaqri N, Ali Alghamdi A. Micro-Plasma Assisted Synthesis of ZnO Nanosheets for the Efficient Removal of Cr6+ from the Aqueous Solution. Crystals. 2021; 11(1):2. https://doi.org/10.3390/cryst11010002

Chicago/Turabian Style

Kumar, Pawan, Meenu Saini, Maninder Singh, Nidhi Chhillar, Brijnandan S. Dehiya, Kamal Kishor, Fahad A. Alharthi, Nabil Al-Zaqri, and Abdulaziz Ali Alghamdi. 2021. "Micro-Plasma Assisted Synthesis of ZnO Nanosheets for the Efficient Removal of Cr6+ from the Aqueous Solution" Crystals 11, no. 1: 2. https://doi.org/10.3390/cryst11010002

APA Style

Kumar, P., Saini, M., Singh, M., Chhillar, N., S. Dehiya, B., Kishor, K., Alharthi, F. A., Al-Zaqri, N., & Ali Alghamdi, A. (2021). Micro-Plasma Assisted Synthesis of ZnO Nanosheets for the Efficient Removal of Cr6+ from the Aqueous Solution. Crystals, 11(1), 2. https://doi.org/10.3390/cryst11010002

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