Abstract

Nickel ion imprinted polymer (Ni-IIP) was prepared using microwave-assisted surface imprinting technique with Ni²⁺ as the template, salicylaldehyde-ethylenediamine Schiff base as functional monomers, ethylene glycol dimethacrylate as a crosslinking agent and alkylated silica gel as a carrier. Fourier transform infrared spectroscopy (FTIR) was used to characterize Ni-IIP, which confirmed the successful synthesis of the polymer. Scanning electron microscopy (SEM) was used to compare the surface morphology of Ni-IIP to non-imprinted polymer (NIP). The SEM analysis found that Ni-IIP had many holes on its surface and abundant spherule structures after elution, while NIP only had a few irregular holes on its surface. The adsorption performance of IIP was studied under different conditions, including pH, temperature, and initial concentration of Ni. The experimental results showed that the maximum adsorption capacity of IIP for Ni was 24.23 mg g^–1 at pH 8, temperature of 30°C, adsorption time of 40 min, and initial concentration of Ni of 30 mg L^–1. The pseudo-second-order kinetic equation could better describe the whole adsorption process, suggesting that chemical adsorption mainly controlled the adsorption process of nickel ions. The Langmuir adsorption isotherm model showed a high linear relationship, and the theoretical adsorption capacity was closer to the actual adsorption capacity, indicating that the adsorption of nickel ions by IIP and NIP occurred in a single layer. Selective experiments showed that IIP had specific selectivity for nickel ions compared with Cu²⁺, Zn²⁺, and Cd²⁺. The results obtained from the analysis of regeneration and practical application demonstrate the promising potential of the prepared Ni-IIP for the efficient removal of nickel pollutants from water sources. These findings provide a new approach to the removal of Ni from wastewater.

中文翻译：

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微波辅助合成镍表面离子印迹聚合物高效去除废水中的镍

摘要

以Ni ²⁺为模板，水杨醛-乙二胺席夫碱为功能单体，乙二醇二甲基丙烯酸酯为交联剂，烷基化硅胶为载体，采用微波辅助表面印迹技术制备了镍离子印迹聚合物（Ni-IIP）。使用傅里叶变换红外光谱（FTIR）对Ni-IIP进行了表征，证实了聚合物的成功合成。使用扫描电子显微镜 (SEM) 比较 Ni-IIP 与非印迹聚合物 (NIP) 的表面形态。SEM分析发现，洗脱后Ni-IIP表面有很多孔洞，且具有丰富的球状结构，而NIP表面只有少量不规则的孔洞。研究了 IIP 在不同条件下的吸附性能，包括 pH、温度和 Ni 的初始浓度。实验结果表明，在pH 8、温度30℃、吸附时间40 min、Ni初始浓度30 mg L ^{–1时，IIP对Ni的最大吸附容量为24.23 mg g –1}。准二级动力学方程可以更好地描述整个吸附过程，表明化学吸附主要控制镍离子的吸附过程。Langmuir吸附等温线模型表现出高度的线性关系，理论吸附容量更接近实际吸附容量，表明IIP和NIP对镍离子的吸附发生在单层。选择性实验表明，与Cu ²⁺、Zn ²⁺、Cd ²⁺相比，IIP对镍离子具有特异性选择性。再生分析和实际应用的结果表明所制备的Ni-IIP在有效去除水源中的镍污染物方面具有良好的潜力。这些发现为去除废水中的镍提供了一种新方法。