ABSTRACT

We have developed a clean route for the modification of polyvinylchloride surface (PVC) with 4-amino-5-hydrazino-1,2,4-triazole-3-thiol molecule. The modification reaction was investigated through Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) analysis. According to our findings, S-H groups are responsible to the molecule attachment and nitrogen atoms are directly involved in metal ion coordination. These results are in agreement with the pseudo-second-order kinetic model, which infers that chemisorption is the main mechanism for metal removal. Adsorption isotherms of Cd(II), Cu(II) and Pb(II) follow the Langmuir model and the results indicated that N_s values are 0.39, 0.52 and 0.15 mmol g⁻¹, respectively. The calculated Ø^max values for Cu(II), Pb(II) and Cd(II) were 3.93, 2.95 and 1.13, respectively, indicating that three types of complex are formed depending on the adsorbed species. Therefore, it can be concluded that PVC use as adsorbent is feasible since it requires a simple modification reaction with nontoxic and low-cost solvents.

摘要

我们开发了一条清洁的路线，用于用 4-amino-5-hydrazino-1,2,4-triazole-3-thiol 分子改性聚氯乙烯表面 (PVC)。通过傅里叶变换红外光谱 (FTIR) 和 X 射线光电子能谱 (XPS) 分析研究改性反应。根据我们的发现，SH 基团负责分子附着，氮原子直接参与金属离子配位。这些结果与准二级动力学模型一致，该模型推断化学吸附是金属去除的主要机制。Cd(II)、Cu(II)和Pb(II)的吸附等温线遵循Langmuir模型，结果表明N _s值分别为0.39、0.52和0.15 mmol g ^-1。计算出的 Ø ^maxCu(II)、Pb(II) 和 Cd(II) 的值分别为 3.93、2.95 和 1.13，表明根据吸附的种类形成三种类型的络合物。因此，可以得出结论，PVC 用作吸附剂是可行的，因为它需要与无毒且低成本的溶剂进行简单的改性反应。