A novel bio-adsorbent named SA-PAM/GO hydrogel composites was synthesized through free radical polymerization. The structure and performance were characterized and analyzed by BET, SEM-EDS, FTIR and TGA. After modification, the BET surface area increased more than tripled, which was consistent with SEM results. Under optimal conditions, the maximum adsorption capacity of Cu²⁺ and Pb²⁺ were 68.76 mg/g and 240.69 mg/g, respectively. In addition, the research of kinetics and isotherms displayed that the pseudo-second-order kinetic model and the Langmuir isotherm model fitted the data well. After further research, the different adsorption mechanism including physical adsorption, chemical adsorption and electrostatic interactions were discussed. The chemical adsorption accompanying the ion exchange process was confirmed as the staple adsorption mechanism. Furthermore, the adsorbent still maintained good adsorption capacity after 5 cycles of adsorption-regeneration. Therefore, the SA-PAM/GO hydrogel composites have potential to remove the heavy metal ions from water body effectively.

通过自由基聚合合成了一种新型的生物吸附剂SA-PAM / GO水凝胶复合材料。通过BET，SEM-EDS，FTIR和TGA对结构和性能进行表征和分析。改性后，BET表面积增加了两倍以上，这与SEM结果一致。在最佳条件下，Cu ²⁺和Pb ²⁺的最大吸附容量分别为68.76 mg / g和240.69 mg / g。另外，动力学和等温线的研究表明，伪二级动力学模型和Langmuir等温线模型很好地拟合了数据。经过进一步研究，讨论了不同的吸附机理，包括物理吸附，化学吸附和静电相互作用。伴随离子交换过程的化学吸附被确认为钉吸附机理。此外，在吸附再生5个循环后，吸附剂仍保持良好的吸附能力。因此，SA-PAM / GO水凝胶复合材料具有有效去除水体中重金属离子的潜力。