To achieve efficient adsorption and recycling of Cu²⁺ in wastewater, using Cu²⁺ as template ion, glutaraldehyde as crosslinker, three sodium alginate hydrogel beads including SA, SAC, and SAB beads were prepared by imprinting sol–gel method using sodium alginate (SA) with carboxymethyl cellulose (CMC) and β-cyclodextrin (β-CD) as different precursors, respectively. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize and analyze morphology and composition change of the hydrogel beads, respectively. When the mass ratio of SA to CMC or SA to β-CD reach 1:1, the SAC beads or SAB beads are nearly homogeneous sphere. Then the effects of pH, adsorption time, initial concentration of Cu²⁺, adsorbent dosage, and coexisting ions on the adsorption efficiency of three hydrogel beads were investigated. The results indicated that adding carboxymethyl cellulose and β-cyclodextrin into skeleton of beads increased the toughness of the beads and improved the adsorption capacity of Cu²⁺. Compared to the saturated adsorption capacity 510 mg/g of Cu²⁺ on SA, the saturated adsorption capacity of Cu²⁺ on SAB and SAC reached 817 mg/g and 822 mg/g, respectively. And their adsorption efficiency for Cu²⁺ are over 95% at 25 °C with pH of 7, contact time within 350 min, adsorbent dosage of 4 mg/50 mL, and initial concentration of 5 mg/L. Thus, SAC and SAB beads could be used as adsorption material for detecting and removing Cu²⁺ from wastewater.

为实现废水中Cu ²⁺的高效吸附和循环利用，以Cu ²⁺为模板离子，戊二醛为交联剂，采用海藻酸钠印迹溶胶-凝胶法制备了SA、SAC和SAB三种海藻酸钠水凝胶珠。 SA）分别以羧甲基纤维素（CMC）和β-环糊精（β -CD）作为不同的前体。扫描电子显微镜和傅里叶变换红外光谱分别用于表征和分析水凝胶珠的形态和组成变化。当 SA 与 CMC 或 SA 与β的质量比-CD 达到 1:1，SAC 珠或 SAB 珠几乎是均匀的球体。然后研究了pH、吸附时间、Cu ²⁺初始浓度、吸附剂用量和共存离子对三种水凝胶珠吸附效率的影响。结果表明，在珠粒骨架中加入羧甲基纤维素和β-环糊精可以增加珠粒的韧性，提高对Cu ²⁺的吸附能力。与Cu ²⁺在SA上的饱和吸附容量510 mg/g相比，Cu ²⁺在SAB和SAC上的饱和吸附容量分别达到817 mg/g和822 mg/g。及其对Cu ^{2+的吸附效率}在 25°C、pH 为 7、接触时间在 350 分钟内、吸附剂用量为 4 mg/50 mL、初始浓度为 5 mg/L 时，吸附量超过 95%。因此，SAC 和 SAB 珠可用作吸附材料，用于检测和去除废水中的 Cu ²⁺。