Heteroatom Decorated Polythiourethane Sorbent for Copper (II) Extraction in Wastewater Treatment
SPE transactions/Polymer engineering and science(2024)
摘要
Copper ions in wastewater present substantial environmental hazards, toxic to aquatic species and prone to bioaccumulation. Addressing this, we present a novel cross-linked polythiourethane (C-PTU) as a promising chelating adsorbent for the effective removal of copper ions from wastewater. A new monomer, 5-(2,2,2-trifluoroacetamide) benzene-1,3-bis(carbonyl) isothiocyanate (TFA-ITC), was synthesized and further condensed with a 1,4-butane diol to produce a trifluoroacetamide functionalized polythiourethane (TFA-PTU) and subsequently generating amine functionalized polythiourethane (A-PTU). The cross-linking reaction was carried out through amino groups present on the polymer backbone with terephthaloyl chloride, resulting in the formation of C-PTU. The monomer and polymers underwent characterization using Fourier transform infrared,H- 1, and C-13 nuclear magnetic resonance spectroscopy, with X-ray diffraction analyzing the resin's chain alignment. Thermogravimetric and differential scanning calorimetry assessed C-PTU's thermal properties. The adsorption process for Cu(II) ions was studied using atomic absorption spectroscopy, optimizing conditions for maximal uptake. Results revealed that C-PTU exhibited a significant adsorption capacity for Cu(II) ions, reaching 67% after a 2 h contact time, with optimal adsorption occurring at pH 6. The Langmuir adsorption isotherm described the sorption mechanism, indicating favorable monolayer cation adsorption via coordination with donor sites on C-PTU. This research presents a viable solution for copper ion contamination in wastewater, illustrating C-PTU as an efficient, environmentally friendly adsorbent, marking progress toward cleaner water resources.
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关键词
adsorption,crosslinking,polythiourethanes
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