Wu Tingxiang, Sawut Amatjan, Simayi Rena
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, China.
College of Chemical Engineering, Xinjiang University, Urumqi 830017, China.
Gels. 2025 Mar 21;11(4):224. doi: 10.3390/gels11040224.
This study utilized the Schiff base reaction as a chemical bonding method to successfully graft 2-aminopyridine onto oxidized sodium alginate, resulting in the formation of modified sodium alginate (OSM). Subsequently, the OSM/polyacrylic acid (OSM/PAA) hydrogel was synthesized via a thermally initiated free radical polymerization process and evaluated as an adsorbent for the removal of heavy metal ions from wastewater. Comprehensive characterization of the prepared samples was performed using FT-IR, SEM, and TGA. The influence of temperature, pH, adsorbent dosage, contact time, and heavy metal ion concentration on the adsorption capacity of the OSM/PAA adsorbent in simulated wastewater was thoroughly investigated. Additionally, a detailed analysis of the adsorption thermodynamics, kinetics, and mechanisms was conducted. Experimental results indicated that at 25 °C, pH 5.0, and an adsorbent dosage of 0.4 g/L, the maximum adsorption capacities of the OSM/PAA hydrogel for Cu(II), Zn(II), and Ni(II) were 367.64 mg/g, 398.4 mg/g, and 409.83 mg/g, respectively. These findings suggest that the adsorption of heavy metal ions by OSM/PAA is a spontaneous, heterogeneous chemical process with significant potential for practical applications in wastewater treatment.
本研究利用席夫碱反应作为化学键合方法，成功地将2-氨基吡啶接枝到氧化海藻酸钠上，形成了改性海藻酸钠（OSM）。随后，通过热引发自由基聚合过程合成了OSM/聚丙烯酸（OSM/PAA）水凝胶，并将其作为吸附剂用于去除废水中的重金属离子进行了评估。使用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和热重分析（TGA）对制备的样品进行了全面表征。深入研究了温度、pH值、吸附剂用量、接触时间和重金属离子浓度对OSM/PAA吸附剂在模拟废水中吸附容量的影响。此外，还对吸附热力学、动力学和机理进行了详细分析。实验结果表明，在25℃、pH值为5.0、吸附剂用量为0.4 g/L时，OSM/PAA水凝胶对Cu（II）、Zn（II）和Ni（II）的最大吸附容量分别为367.64 mg/g、398.4 mg/g和409.83 mg/g。这些结果表明，OSM/PAA对重金属离子的吸附是一个自发的、非均相的化学过程，在废水处理中具有显著的实际应用潜力。
