Synthesis and Characterization of Immobilized Thiolactic Ligand System for the Detoxification of Tannery Wastewater


  • Bulus Habila Directorate of Research and Development, Nigerian Institute of Leather and Science Technology, Zaria
  • Ukoha Pius O. Department of Pure and Industrial Chemistry University of Nigeria Nsukka, Enugu, Nigeria
  • Ezeh Emmanuel C. Department of Industrial Chemistry, Enugu State University of Science and Technology, Enugu, Nigeria
  • Ujam Oguejiofo Department of Pure and Industrial Chemistry University of Nigeria Nsukka, Enugu, Nigeria
  • Attah John C Department of Industrial Chemistry, Enugu State University of Science and Technology, Enugu, Nigeria
  • Simon Moses S National Institue of Hospitality Tourism tudies, Kaduna Training Centre, Kaduna, Nigeria



tannery wastewater, detoxification, polysiloxane, thiosalicylic ligand, thermodynamic


A porous solid polysiloxane immobilized thiosalicylic acid ligand system has been prepared by hydrolytic polycondensation of tetraethylorthosilicate with a mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as a catalyst, gelation formed after 40 min. The product formed was functionalized with excess ethylchloroacetate, triethylamine and immobilized with thiosalicylic acid. The immobilized ligand was characterized using FTIR, the spectrum showed characteristic absorption regions (cm-1) at: 3384 (OH), 1587 to 1722 (C=C, C=O); 900 to 1038 (Si - O) respectively. SEM-EDX showed irregular particle sizes of the polysiloxane matrices with elemental composition (wt %): 3-CPPS; Si (50.45), O (25.02) and Cl (24.57). F - 3CPPS showed, O (58.68), Si (41.32); thiolactic (0.00 of S). The competitive sorption characteristic of the metal ions (Cr3+, Fe3+, Pb2+, Cu2+ and Zn2+) were studied using Microwave Plasma Atomic Emission Spectrophotometer (Agilent MPAES-4200). The immobilized thiolactic ligand exhibits high potential for the extraction of heavy metals in tannery wastewater at pH 6.0, this development would improve the treatment of tannery wastewater at a low cost; batch or column systems of extraction of metal could be employed. Thermodynamic range for the parameters with respect to Cr3+, Fe3+, Pb2+, Cu2+ and Zn2+ yielded negative values for ΔGo, (Cu2+ -(8.650  to 11.962) to Fe2+ -(14.368 to 14.842) KJmol-1; positive values for ΔHo: Zn2+ (0.000) to Cu2+ (21.047)  KJmol-1 and ΔSo: Zn2+ (47.421) to Fe3+ (245.869) Jmol1K1 respectively, indicating spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system.



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How to Cite

Habila, B. ., Pius O., U. ., Emmanuel C., E. ., Oguejiofo, U. ., John C, A. ., & Moses S, S. . (2020). Synthesis and Characterization of Immobilized Thiolactic Ligand System for the Detoxification of Tannery Wastewater. European Journal of Applied Sciences, 8(5), 18–27.