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Development of Three-Dimensional Nickel-Cobalt Oxide Nanoflowers for Superior Photocatalytic Degradation of Food Colorant Dyes: Catalyst Properties and Reaction Kinetic Study

Title
Development of Three-Dimensional Nickel-Cobalt Oxide Nanoflowers for Superior Photocatalytic Degradation of Food Colorant Dyes: Catalyst Properties and Reaction Kinetic Study
Authors
Nazim, MohammedKim, Jae HyunLee, Hee-YoungCho, Sung Ki
DGIST Authors
Nazim, Mohammed; Kim, Jae Hyun; Lee, Hee-Young; Cho, Sung Ki
Issue Date
2021-10
Citation
Langmuir, 37(44), 12929-12939
Type
Article
Keywords
DegradationKinetic theoryKineticsNanosheetsNickel oxideOrganic pollutantsPore sizeRate constantsWater pollutionWater treatmentX ray diffraction analysisAllura redCatalyst propertiesDye removalEco-friendlyFood colourantsHydrothermal routesKinetic studyNickel cobalt oxidesOxide nanosheetsPhotocatalytic degradationHigh resolution transmission electron microscopyAtomic force microscopyCobalt compoundsCrystal structureCrystallite size
ISSN
0743-7463
Abstract
In this work, we present three-dimensional flower-like nickel-cobalt oxide (F-NCO) nanosheets developed in a facile, eco-friendly hydrothermal route to apply as photocatalysts for food colorant Allura Red AC dye removal under light illumination. Using Brunauer-Emmett-Teller analysis, it was found that the F-NCO nanosheets displayed a surface area of ∼53.65 m2/g and a Barrett-Joyner-Halenda pore size of ∼14 nm, which was also confirmed by the calculated crystallite size of ∼15 nm using powder X-ray diffraction (XRD) analysis. From Williamson-Hall analysis of XRD spectra, F-NCO nanosheets revealed a crystal-lattice strain of ∼3.42 × 10-3 and a dislocation density of ∼4.397 × 1015 lines/m2 in the crystal structure. Transmission electron microscopy analysis revealed that F-NCO nanosheets accumulated to form flower-like nanostructures of <100 nm length with a d-spacing of ∼2.6 Å, which is attributed to the (311) crystallographic plane (α = γ= β = 90°, a = b = c = 8.110 Å, JCPDS No. 00-020-0781) of the cubic phase. The F-NCO nanosheets exhibited an excellent photocatalytic efficiency of ∼94.75% in ∼10 min with sodium borohydride under UV light. The Langmuir-Hinshelwood model determined pseudo-first-order reaction kinetics of dye degradation using the ln[AtA0]versus time plot. The kinetic study produced a first-order rate constant (k) of ∼0.219 min-1, resulting in ∼3.16 min half-life (t1/2) for the F-NCO-catalyzed degradation reaction. Thus outstanding photocatalytic performance of F-NCO nanosheets would display their huge potential for organic-pollutant removal from water with exceptional recyclability for wide research applications in the future. ©
URI
http://hdl.handle.net/20.500.11750/15859
DOI
10.1021/acs.langmuir.1c01999
Publisher
American Chemical Society
Related Researcher
  • Author Kim, Jae Hyun  
  • Research Interests 에너지, 배터리, 고체전해질, 태양전지, 전기차, 리튬이온배터리
Files:
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Collection:
Division of Energy Technology1. Journal Articles


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