A series of interpenetrating polymer network sodium alginate-g-poly(sodium acrylate) (PASA) hydrogels (PASA-1, PASA-3, and PASA-5) were prepared through the thermal radical polymerization. Fourier transform infrared spectroscopy results revealed that all the hydrogels had been prepared successfully. The effects of various amounts of sodium alginate (SA) on various properties were investigated. When increasing the amount of SA in PASA polymer, the number of pores increased but the size of poores decreased. In addition, PASA hydrogels presenting crosslinking qualities exhibited relatively low swelling in water. Finally, the synthesized hydrogels were tested as adsorbents for ammonium chloride (NH₄Cl) solution. The PASA-1 hydrogel exhibited the highest ammonia nitrogen adsorption capacity (12.9 mg/g), which 21.1 % higher than that of the reference poly(sodium acrylate) (PANa) hydrogel (10.7 mg/g) under similar conditions. The synthesized PASA-1 hydrogel exhibited satisfactory reusability and maintained 87 % of its adsorption capacity after nine cycles of ammonium nitrogen adsorption–desorption.

通过热自由基聚合制备了一系列互穿聚合物网络海藻酸钠-g-聚丙烯酸钠（PASA）水凝胶（PASA-1、PASA-3和PASA-5 ）。傅里叶变换红外光谱结果表明，所有水凝胶均已成功制备。研究了不同量的海藻酸钠 (SA) 对各种性能的影响。当增加 PASA 聚合物中 SA 的含量时，孔的数量增加，但孔的尺寸减小。此外，具有交联特性的 PASA 水凝胶在水中表现出相对较低的溶胀。最后，合成的水凝胶作为氯化铵（NH ₄ Cl）溶液的吸附剂进行了测试。PASA -1水凝胶表现出最高的氨氮吸附容量（12.9 mg/g），在类似条件下比参考聚丙烯酸钠（PANa）水凝胶（10.7 mg/g）高出21.1%。合成的PASA-1水凝胶表现出令人满意的可重复使用性，并在 9 次铵氮吸附-解吸循环后保持其 87% 的吸附容量。