Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater

Amarja P. Naik; Jyoti V. Sawant; Hemant Mittal; Ali Al Alili; Pranay P. Morajkar

doi:10.1016/j.molliq.2020.115235

Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni_1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater

Amarja P. Naik
, Jyoti V. Sawant
, Hemant Mittal
, Ali Al Alili
, Pranay P. Morajkar

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

23 Scopus citations

Abstract

This study reports a simple method of direct calcination of Ni (II) coordination compounds with N-donor and O-donor ligands such as imidazole and 4-nitrobenzoate to form 2D and 3D Ni_1−xO nanostructures. Controlled calcination of imidazole coordinated compound [Ni(Im)₆](4-nba)₂.2H₂O (I) produced 2D nanoflakes in comparison to 4-nitrobenzoate coordinated compound [Ni(H₂O)₄(4-nba)₂].2H₂O which formed Ni_1−xO nanosponge. Replacement of four coordinated imidazole ligands in compound I with an equivalent number of 4-nitrobenzoate and water molecules as in [Ni(H₂O)₂(Im)₂(4-nba)₂] (II) lead to the collapse of flake-like structure upon combustion with the induction of porosity, confirming the dominant effect of 4-nitrobenzoate ligand to form porous structures of Ni_1−xO. Material characterization studies revealed that all Ni_1−xO nanostructures exhibit cubic phase wherein increase in surface area, pore-volume, and reduction in particle size from 2D nanoflakes to 3D nanosponge is evident. The adsorptive removal of Amaranth dye as a model pollutant using synthesized Ni_1−xO nanostructures exhibited high dye removal efficiency of up to 82.81% in the case of 3D nanosponge. The adsorption process is well explained based on the Sips isotherm model and pseudo-first-order reaction kinetics. Photocatalytic Amaranth dye degradation efficiency of 93.80% in 70 min with highest k_app = 4.04×10⁻² min⁻¹ is achieved which is attributed to the high surface area and reduction in charge carrier recombination rate as a result of extensive and robust mesoporous structure.

Original language	British English
Article number	115235
Journal	Journal of Molecular Liquids
Volume	325
DOIs	https://doi.org/10.1016/j.molliq.2020.115235
State	Published - 1 Mar 2021

Keywords

2D nanoflakes
3D nanosponge
Adsorption
Amaranth dye
Kinetic Mmodeling
NiO
Photocatalysis

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

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Naik, A. P., Sawant, J. V., Mittal, H., Al Alili, A., & Morajkar, P. P. (2021). Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni_1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater. Journal of Molecular Liquids, 325, Article 115235. https://doi.org/10.1016/j.molliq.2020.115235

@article{bff654d3d9ea4d75b6647adb7c8d8bc6,

title = "Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater",

abstract = "This study reports a simple method of direct calcination of Ni (II) coordination compounds with N-donor and O-donor ligands such as imidazole and 4-nitrobenzoate to form 2D and 3D Ni1−xO nanostructures. Controlled calcination of imidazole coordinated compound [Ni(Im)6](4-nba)2.2H2O (I) produced 2D nanoflakes in comparison to 4-nitrobenzoate coordinated compound [Ni(H2O)4(4-nba)2].2H2O which formed Ni1−xO nanosponge. Replacement of four coordinated imidazole ligands in compound I with an equivalent number of 4-nitrobenzoate and water molecules as in [Ni(H2O)2(Im)2(4-nba)2] (II) lead to the collapse of flake-like structure upon combustion with the induction of porosity, confirming the dominant effect of 4-nitrobenzoate ligand to form porous structures of Ni1−xO. Material characterization studies revealed that all Ni1−xO nanostructures exhibit cubic phase wherein increase in surface area, pore-volume, and reduction in particle size from 2D nanoflakes to 3D nanosponge is evident. The adsorptive removal of Amaranth dye as a model pollutant using synthesized Ni1−xO nanostructures exhibited high dye removal efficiency of up to 82.81\% in the case of 3D nanosponge. The adsorption process is well explained based on the Sips isotherm model and pseudo-first-order reaction kinetics. Photocatalytic Amaranth dye degradation efficiency of 93.80\% in 70 min with highest kapp = 4.04×10−2 min−1 is achieved which is attributed to the high surface area and reduction in charge carrier recombination rate as a result of extensive and robust mesoporous structure.",

keywords = "2D nanoflakes, 3D nanosponge, Adsorption, Amaranth dye, Kinetic Mmodeling, NiO, Photocatalysis",

author = "Naik, \{Amarja P.\} and Sawant, \{Jyoti V.\} and Hemant Mittal and \{Al Alili\}, Ali and Morajkar, \{Pranay P.\}",

note = "Funding Information: The authors would also like to thank the funding agencies namely, UGC-BSR ( F.30-102/2015 ), DST SERB ( ECR/2015/000047 ) and DST/INNO-INDIGO ( DST/IMRCD/INNO-INDIGO/BIO-CFD/2017(G) ) for providing financial support for this study. Miss Amarja P. Naik is grateful to Mr. Akshay V. Salkar for his continued support and Goa University for financial support through Ph.D. research studentship. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = mar,

day = "1",

doi = "10.1016/j.molliq.2020.115235",

language = "British English",

volume = "325",

journal = "Journal of Molecular Liquids",

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publisher = "Elsevier B.V.",

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Naik, AP, Sawant, JV, Mittal, H, Al Alili, A & Morajkar, PP 2021, 'Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni_1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater', Journal of Molecular Liquids, vol. 325, 115235. https://doi.org/10.1016/j.molliq.2020.115235

Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni_1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater. / Naik, Amarja P.; Sawant, Jyoti V.; Mittal, Hemant et al.
In: Journal of Molecular Liquids, Vol. 325, 115235, 01.03.2021.

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

TY - JOUR

T1 - Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate

T2 - Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater

AU - Naik, Amarja P.

AU - Sawant, Jyoti V.

AU - Mittal, Hemant

AU - Al Alili, Ali

AU - Morajkar, Pranay P.

N1 - Funding Information: The authors would also like to thank the funding agencies namely, UGC-BSR ( F.30-102/2015 ), DST SERB ( ECR/2015/000047 ) and DST/INNO-INDIGO ( DST/IMRCD/INNO-INDIGO/BIO-CFD/2017(G) ) for providing financial support for this study. Miss Amarja P. Naik is grateful to Mr. Akshay V. Salkar for his continued support and Goa University for financial support through Ph.D. research studentship. Publisher Copyright: © 2020 Elsevier B.V.

PY - 2021/3/1

Y1 - 2021/3/1

N2 - This study reports a simple method of direct calcination of Ni (II) coordination compounds with N-donor and O-donor ligands such as imidazole and 4-nitrobenzoate to form 2D and 3D Ni1−xO nanostructures. Controlled calcination of imidazole coordinated compound [Ni(Im)6](4-nba)2.2H2O (I) produced 2D nanoflakes in comparison to 4-nitrobenzoate coordinated compound [Ni(H2O)4(4-nba)2].2H2O which formed Ni1−xO nanosponge. Replacement of four coordinated imidazole ligands in compound I with an equivalent number of 4-nitrobenzoate and water molecules as in [Ni(H2O)2(Im)2(4-nba)2] (II) lead to the collapse of flake-like structure upon combustion with the induction of porosity, confirming the dominant effect of 4-nitrobenzoate ligand to form porous structures of Ni1−xO. Material characterization studies revealed that all Ni1−xO nanostructures exhibit cubic phase wherein increase in surface area, pore-volume, and reduction in particle size from 2D nanoflakes to 3D nanosponge is evident. The adsorptive removal of Amaranth dye as a model pollutant using synthesized Ni1−xO nanostructures exhibited high dye removal efficiency of up to 82.81% in the case of 3D nanosponge. The adsorption process is well explained based on the Sips isotherm model and pseudo-first-order reaction kinetics. Photocatalytic Amaranth dye degradation efficiency of 93.80% in 70 min with highest kapp = 4.04×10−2 min−1 is achieved which is attributed to the high surface area and reduction in charge carrier recombination rate as a result of extensive and robust mesoporous structure.

AB - This study reports a simple method of direct calcination of Ni (II) coordination compounds with N-donor and O-donor ligands such as imidazole and 4-nitrobenzoate to form 2D and 3D Ni1−xO nanostructures. Controlled calcination of imidazole coordinated compound [Ni(Im)6](4-nba)2.2H2O (I) produced 2D nanoflakes in comparison to 4-nitrobenzoate coordinated compound [Ni(H2O)4(4-nba)2].2H2O which formed Ni1−xO nanosponge. Replacement of four coordinated imidazole ligands in compound I with an equivalent number of 4-nitrobenzoate and water molecules as in [Ni(H2O)2(Im)2(4-nba)2] (II) lead to the collapse of flake-like structure upon combustion with the induction of porosity, confirming the dominant effect of 4-nitrobenzoate ligand to form porous structures of Ni1−xO. Material characterization studies revealed that all Ni1−xO nanostructures exhibit cubic phase wherein increase in surface area, pore-volume, and reduction in particle size from 2D nanoflakes to 3D nanosponge is evident. The adsorptive removal of Amaranth dye as a model pollutant using synthesized Ni1−xO nanostructures exhibited high dye removal efficiency of up to 82.81% in the case of 3D nanosponge. The adsorption process is well explained based on the Sips isotherm model and pseudo-first-order reaction kinetics. Photocatalytic Amaranth dye degradation efficiency of 93.80% in 70 min with highest kapp = 4.04×10−2 min−1 is achieved which is attributed to the high surface area and reduction in charge carrier recombination rate as a result of extensive and robust mesoporous structure.

KW - 2D nanoflakes

KW - 3D nanosponge

KW - Adsorption

KW - Amaranth dye

KW - Kinetic Mmodeling

KW - NiO

KW - Photocatalysis

UR - https://www.scopus.com/pages/publications/85099209358

U2 - 10.1016/j.molliq.2020.115235

DO - 10.1016/j.molliq.2020.115235

M3 - Article

AN - SCOPUS:85099209358

SN - 0167-7322

VL - 325

JO - Journal of Molecular Liquids

JF - Journal of Molecular Liquids

M1 - 115235

ER -

Naik AP, Sawant JV, Mittal H, Al Alili A, Morajkar PP. Facile synthesis of 2D nanoflakes and 3D nanosponge-like Ni_1−xO via direct calcination of Ni (II) coordination compounds of imidazole and 4-nitrobenzoate: Adsorptive separation kinetics and photocatalytic removal of Amaranth dye contaminated wastewater. Journal of Molecular Liquids. 2021 Mar 1;325:115235. doi: 10.1016/j.molliq.2020.115235