Treatment of wastewater which containing organic dyes has attracted great attention in the last decades since organic dyes were produced in an increasing quantity. Hydrogel adsorbent, as a promising candidate for organic dye removal from aqueous solution, has been studied by many researchers in recent years. However, it's still a challenge to create hydrogel adsorbent with high adsorption capacity and short contact time concurrently. Herein, we present a polyelectrolyte hydrogel adsorbent for anionic dyes removal which constructed by cationic monomer diallyldimethylammonium chloride (DADMAC) and acrylamide (AAm). Using calcium hydroxide nano-spherulites (CNS) as crosslinker, this physical hydrogel adsorbent showed a loosely crosslinked network structure. In optimal condition, the obtained P(AAm-DADMAC)/CNS hydrogel adsorbent showed a maximum adsorption capacity of 409 mg/g for methyl orange with a short contact time of 135 min. In addition, the adsorption process of this hydrogel adsorbent was well described by pseudo-first-order kinetic model and Langmuir adsorption isotherm model. Moreover, our P(AAm-DADMAC)/CNS hydrogel adsorbent also exhibited high adsorption capacities for other anionic dye, including Congo red (862 mg/g), Eriochrome black T (1139 mg/g) and methyl blue (722 mg/g). These results indicated that the P(AAm-DADMAC)/CNS hydrogel was a promising adsorbent material in wastewater treatment application.

近几十年来，随着有机染料产量的增加，对含有机染料的废水的处理引起了人们的广泛关注。水凝胶吸附剂作为一种很有前途的从水溶液中去除有机染料的候选材料，近年来已被许多研究人员研究。然而，同时创造具有高吸附容量和短接触时间的水凝胶吸附剂仍然是一个挑战。在此，我们提出了一种由阳离子单体二烯丙基二甲基氯化铵 (DADMAC) 和丙烯酰胺 (AAm) 构成的用于去除阴离子染料的聚电解质水凝胶吸附剂。使用氢氧化钙纳米球晶（CNS）作为交联剂，这种物理水凝胶吸附剂呈现出松散交联的网络结构。在最佳状态下，得到的 P(AAm-DADMAC)/CNS 水凝胶吸附剂对甲基橙的最大吸附容量为 409 mg/g，接触时间短为 135 min。此外，该水凝胶吸附剂的吸附过程通过准一级动力学模型和Langmuir吸附等温线模型得到了很好的描述。此外，我们的 P(AAm-DADMAC)/CNS 水凝胶吸附剂还表现出对其他阴离子染料的高吸附能力，包括刚果红 (862 mg/g)、Eriochrome black T (1139 mg/g) 和甲基蓝 (722 mg/g) ）。这些结果表明，P(AAm-DADMAC)/CNS 水凝胶在废水处理应用中是一种很有前途的吸附材料。该水凝胶吸附剂的吸附过程通过准一级动力学模型和Langmuir吸附等温线模型得到了很好的描述。此外，我们的 P(AAm-DADMAC)/CNS 水凝胶吸附剂还表现出对其他阴离子染料的高吸附能力，包括刚果红 (862 mg/g)、Eriochrome black T (1139 mg/g) 和甲基蓝 (722 mg/g) ）。这些结果表明，P(AAm-DADMAC)/CNS 水凝胶在废水处理应用中是一种很有前途的吸附材料。该水凝胶吸附剂的吸附过程通过准一级动力学模型和Langmuir吸附等温线模型得到了很好的描述。此外，我们的 P(AAm-DADMAC)/CNS 水凝胶吸附剂还表现出对其他阴离子染料的高吸附能力，包括刚果红 (862 mg/g)、Eriochrome black T (1139 mg/g) 和甲基蓝 (722 mg/g) ）。这些结果表明，P(AAm-DADMAC)/CNS 水凝胶在废水处理应用中是一种很有前途的吸附材料。