Vol. 2, Issue 6 (2018)
A porous solid thiosalicylic-thiolactic immobilized polysiloxane bi-ligand system has been prepared by hydrolytic Polycondensation of tetraethyl Orthosilicate with a mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as a catalyst, gelation formed after 40 min. The product was functionalized with excess ethyl chloroacetate, triethylamine and immobilized with thiosalicylic-thiolactic acid. The competitive sorption characteristic of the metal ions (Cu2+ and Zn2+) were studied using Microwave Plasma Atomic Emission Spectrophotometer (MPAES). The immobilized thiosalicylic-thiolactic bi-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 system of extraction of metal could be employed. The adsorption effects of various weights of the adsorbent from 10 to 30 mg/60 cm3 with mesh size of (125-150 µm) were used for the extraction of metal ion and all the masses showed significant extraction of the metal ions, Cu2+ percentage adsorption increases with the increase in the amount of adsorbent from 95.2-100 % while Zn2+ showed no significant increase with the increased in the amount of adsorbent in the treatment of tannery wastewater. Thermodynamic parameters of the study yielded negative range values for ΔGo (Cu2+ -10.240 to -11.962 and Zn2+ - 14.369 to -14.843 KJmol-1 ), positive values for ΔHo ( Cu2+ 40.258 and Zn2+ 0.000 KJmol-1) and ΔSo ( Cu2+ 178.518 and Zn2+ 47.421 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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