Effective wastewater treatments are of great importance to contemporary scientists, because the existing methods are ineffective for detoxifying tannery wastewater.
Polysiloxanes are characterized by silicon and oxygen backbone and are hydrophobic in nature with low moisture uptake widely used for medical applications. Polysiloxane immobilized thiosalicylic acid ligand system has been prepared through sol-gel method, gelation was observed after 40 minutes. The immobilized ligand was characterized using FTIR, the spectrum showed characteristic absorption bands (cm -1 ) at: 3377 (OH), 2981 (C-H stretch); 2631 (SH); 1587 to 1684 (C=C, C=O); 1032 to 1144 (Si -O) respectively. SEM analysis showed irregular particle sizes of the polysiloxane matrices while EDX elemental composition gave (wt %): 3-CPPS; Si (50.45), O (25.02) and Cl (24.57). F -3CPPS showed, O (58.68), Si (41.32); thiosalicylic (7.14 of S). The extraction of metal ions (Cr 3+ , Fe 3+ , Pb 2+ , Cu 2+ and Zn 2+ ) were studied using Microwave Plasma Atomic Emission Spectrophotometer (Agilent MPAES-4200) at pH 6.0. Thermodynamic range with respect to Cr 3+ , Fe 3+ , Pb 2+ , Cu 2+ and Zn 2+ yielded negative values for∆G o : Cu 2+ -(11.483 to 14.842) to Zn 2+ -(14.368 to 14.842)KJmol -1 ; positive values for ∆H o : Fe 3+ (0.000) to Pb 2+ (105.130)KJmol -1 and ∆S o : Zn 2+ (47.421) to Pb 2+ (389.328)Jmol 1 K 1 respectively, indicating spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system.
<div>Background: Effective wastewater treatments are paramount to modern-day Scientists. The available methods are ineffective in detoxifying tannery wastewater. </div><div>Aim: This study synthesize and characterized polysiloxane-Immobilized thiosalicylic-mercaptoethanol ligand system (PITSMCBLS) and used in detoxification of Cr3+ and Fe3+ from tannery wastewater.</div><div>Method: Porous solid PITSMCBLS was prepared by hydrolytic polycondensation of tetraethylorthosilicate with mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as catalyst. The gelation formed (3-CPP) after 40 min, was functionalized (F-3CPP) with excess ethylchloroacetate, triethylamine and grafted with thiosalicylic-mercaptoethanol bi-ligand. The PITSMCBLS was characterized using FTIR and SEM-EDX. The competitive sorption characteristics of metal ions (Cr3+ and Fe3+) were studied using Microwave Plasma Atomic-Emission Spectrophotometer.</div><div>Result: The FTIR spectrum of PITSMCBLS showed vibrational frequencies (cm-1) at: 3339, (O-H); 2928, (C-H); 2685, (SH); 2497, (Si-H); 1587–1707, (C=O) and 1028, (Si-O). The SEM-EDX showed irregular particle sizes (4.4294 ± 1.7187 nm) and elemental composition (wt %): 3-CPP, Si (50.45); O (25.02) and Cl (24.57). The F-3CPP showed, O (58.68) and Si (41.32), while PITSMCBLS showed 11.94 of S. Gibbs free energy yielded negative range values for ΔGo (Cr3+ -14.187 to -14.832 and Fe3+ - 14.369 to -14.843 kJmol-1), positive values for: ΔHo (Cr3+ 5.345 and Fe3+ 0.000 kJmol-1) and ΔSo (Cr3+ 64.459 and Fe3+ 47.421 Jmol1K1) respectively.</div><div>Conclusion: PITSMCBLS exhibits high potential for extraction of Cr3+ and Fe3+ in tannery wastewater. The Thermodynamic values indicate spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system. This development would improve tannery wastewater treatment.</div>
<div>Background: Effective wastewater treatments are paramount to modern-day Scientists. The available methods are ineffective in detoxifying tannery wastewater. </div><div>Aim: This study synthesize and characterized polysiloxane-Immobilized thiosalicylic-mercaptoethanol ligand system (PITSMCBLS) and used in detoxification of Cr3+ and Fe3+ from tannery wastewater.</div><div>Method: Porous solid PITSMCBLS was prepared by hydrolytic polycondensation of tetraethylorthosilicate with mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as catalyst. The gelation formed (3-CPP) after 40 min, was functionalized (F-3CPP) with excess ethylchloroacetate, triethylamine and grafted with thiosalicylic-mercaptoethanol bi-ligand. The PITSMCBLS was characterized using FTIR and SEM-EDX. The competitive sorption characteristics of metal ions (Cr3+ and Fe3+) were studied using Microwave Plasma Atomic-Emission Spectrophotometer.</div><div>Result: The FTIR spectrum of PITSMCBLS showed vibrational frequencies (cm-1) at: 3339, (O-H); 2928, (C-H); 2685, (SH); 2497, (Si-H); 1587–1707, (C=O) and 1028, (Si-O). The SEM-EDX showed irregular particle sizes (4.4294 ± 1.7187 nm) and elemental composition (wt %): 3-CPP, Si (50.45); O (25.02) and Cl (24.57). The F-3CPP showed, O (58.68) and Si (41.32), while PITSMCBLS showed 11.94 of S. Gibbs free energy yielded negative range values for ΔGo (Cr3+ -14.187 to -14.832 and Fe3+ - 14.369 to -14.843 kJmol-1), positive values for: ΔHo (Cr3+ 5.345 and Fe3+ 0.000 kJmol-1) and ΔSo (Cr3+ 64.459 and Fe3+ 47.421 Jmol1K1) respectively.</div><div>Conclusion: PITSMCBLS exhibits high potential for extraction of Cr3+ and Fe3+ in tannery wastewater. The Thermodynamic values indicate spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system. This development would improve tannery wastewater treatment.</div>
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