Volume 61, Issue 338, May - August 2025

NMR characterization and kinetic performance of polysiloxane immobilized thiosalicylic ligand system on Cr (III) ion from tannery wastewater

Bulus Habila^1♦, Emmanuel C Ezeh², Ezendaba Joy Okwuchukwu³, Agbo Ndidiamaka Justina⁴, Simon S Moses⁵

¹Nigerian Institute of Leather and Science Technology P M B 1034 Samaru Zaria, Nigeria
²Department of Physical Sciences, State University of Science and Technology, Igbo-Eno, Enugu State, Nigeria
³Department of Physical and Industrial Chemistry., University of Nigeria Nsukka, Nigeria
⁴Chemistry Advanced Research Center, Sheda Science and Technology Complex, (SHESTCO) Garki - Abuja, Nigeria
⁵National Institute of Hospitality and Tourism Studies, Kaduna Campus, Kaduna. Nigeria

^♦Corresponding Author
Nigerian Institute of Leather and Science Technology P M B 1034 Samaru Zaria, Nigeria

ABSTRACT

Tannery wastewater hurts the ecosystem with the chemical components used to convert this raw hides and skins into a stable collagen matrix with attendant limitations of various treatment methods was employed. This necessitated the synthesis of Polysiloxane Immobilized Thiosalicylic Ligand System (PITSLS), was characterised and employed for the adsorption of Cr (III) Ion from Tannery Wastewater. The product was characterized using a Nuclear Magnetic Resonance Spectrometer (NMR). 1H-NMR spectrum showed chemical shifts (ppm) at 2.2 assigned to (2H, S); 13C signals at 169.093 assigned to (C=N, C=O) and 124.948 to 139.008 assigned to aromatic carbon respectively for PITSLS which was soluble in deuterated dimethyl sulfoxide. The adsorption percentage of Cr 3+ in tannery wastewater using PITSLS (20 mg), was 97.443 % and 30 mg gave 98.430 % at pH 6.00 respectively. For contact time the results showed a significant adsorption in the first minute of contact time and consequently reduced with an increase in time to 120 min respectively due to the unavailability of reactive sites for adsorption. PITSLS has proven to be a promising adsorbent in the adsorption/detoxification of Cr (III) ions in tannery wastewater.

Keywords: Adsorption, immobilized, polysiloxane, tannery, thiosalicylic, wastewater

Discovery, 2025, 61, e18d3119

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DOI: https://doi.org/10.54905/disssi.v61i338.e18d3119

Published: 25 June 2025