Tailoring Porous NiMoO4 Nanotube via MoO3 Nanorod Precursor for Environmental Monitoring: Electrochemical Detection of Micro-sized Polyvinylchloride

Eun-Bi Kim; M Shaheer Akhtar; Ing Kong; Sadia Ameen

doi:10.1016/j.chemosphere.2024.143796

Tailoring Porous NiMoO₄ Nanotube via MoO₃ Nanorod Precursor for Environmental Monitoring: Electrochemical Detection of Micro-sized Polyvinylchloride

Chemosphere. 2024 Nov 21:143796. doi: 10.1016/j.chemosphere.2024.143796. Online ahead of print.

Authors

Eun-Bi Kim¹, M Shaheer Akhtar², Ing Kong³, Sadia Ameen⁴

Affiliations

¹ Advanced Materials and Devices Laboratory, Department of Bio-Convergence Science, Jeonbuk National University, Jeongeup Campus, 56212, Republic of Korea.
² New & Renewable Energy Material Development Center (NewREC), Jeonbuk National University, Jeonbuk, Republic of Korea; Graduate School of Integrated Energy-AI, Jeonbuk National University, Jeonju, 54896, Republic of Korea; Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju 54896, Republic of Korea; Department of Engineering, School of Computing, Engineering and Mathematical Sciences, La Trobe University, Melbourne, VIC 3086, Australia. Electronic address: shaheerakhtar@jbnu.ac.kr.
³ Department of Engineering, School of Computing, Engineering and Mathematical Sciences, La Trobe University, Melbourne, VIC 3086, Australia.
⁴ Advanced Materials and Devices Laboratory, Department of Bio-Convergence Science, Jeonbuk National University, Jeongeup Campus, 56212, Republic of Korea. Electronic address: sadiaameen@jbnu.ac.kr.

PMID: 39580083
DOI: 10.1016/j.chemosphere.2024.143796

Abstract

Globally, the hidden contaminants like microplastics (MPs) combined with other harmful substances have agglomerated in rivers and oceans that pose a threat to human health. Thus, evaluating the toxicity of MPs separately and in combination with other pollutants must be done quickly and precisely. This work directs the synthesis of porous NiMoO₄ nanotubes (NTs) from the transformation of MoO₃ nanorods (NRs) via two steps hydrothermal methods for the effective detection of polyvinyl chloride (PVC) MPs. Transformation of MoO₃ NRs to porous NiMoO₄ NTs was comprehensively deduced by crystalline, structural, compositional and morphological properties. The hydrophobic nature of MoO₃ NRs and porous NiMoO₄ NTs was proven experimentally and also by DFT calculations. The electrochemical detection of PVC MPs by NiMoO₄ NTs was investigated by the CV and EIS measurements. Porous NiMoO₄ NTs based electrode expressed the good detection towards PVC MPs with a reasonable sensitivity of ∼1.43 x 10^-4 μA/ppm.cm², a low LOD of ∼18 ppm and R₂ = ∼0.9781. EIS results revealed that porous NiMoO₄ NTs electrode enabled to deliver sensing response at very low concentration of PVC MPs. Due to their easy interaction with hydrophobic PVC MPs, the hydrophobic NiMoO₄ NTs controlled the sensing nature of the material and improved the electrochemical detection at the MP-NiMiO₄ NTs interface.

Keywords: NiMoO(4); electrochemical detection; electrode; microplastics; porous nanotubes.