Polyvinyl alcohol (PVA) hydrogel was crosslinked with glutaraldehyde. The crosslinked polyvinyl alcohol (CPVA) was grafted with acrylonitrile using cericammonium nitrate as an initiator (CPVA-PAN), and then modified by hydroxylamine hydrochloride (CPVA-AO-PAN). CPVA, CPVA-PAN, and CPVA-AO-PAN were characterized by Fourier Transform Infrared spectroscopy. Cu²⁺ adsorption by CPVA-AO-PAN reached the equilibrium at contact time of 40 h with a adsorption capacity of 40.7 mg g⁻¹. The effects of initial metal concentration, adsorption time, and pH on adsorption capacity were investigated, respectively. Pseudo-first-order and pseudo-second-order models were employed to evaluate the adsorption kinetics, with the R² values of 0.9524 and 0.9972, respectively. Langmuir and Freundlich isotherm models were compared, and the Langmuir model shows high goodness-of-fit. The adsorption process was endothermic and spontaneous, as evidenced by the positive ∆H and the negative ∆G.

聚乙烯醇（PVA）水凝胶与戊二醛交联。使用硝酸铈铵作为引发剂（CPVA-PAN）将交联的聚乙烯醇（CPVA）与丙烯腈接枝，然后用盐酸羟胺（CPVA-AO-PAN）进行改性。CPVA，CPVA-PAN和CPVA-AO-PAN通过傅里叶变换红外光谱进行了表征。CPVA-AO-PAN对Cu ^2+的吸附在接触时间40 h达到平衡，吸附量为40.7 mg g ^-1。分别研究了初始金属浓度，吸附时间和pH对吸附容量的影响。伪一级和伪二级模型用于评估吸附动力学，R ²值分别为0.9524和0.9972。比较了Langmuir和Freundlich等温模型，Langmuir模型显示出较高的拟合优度。吸附过程是吸热的和自发的，正ΔH和负ΔG证明了这一点。