A facile, environmentally benign approach had been developed for the preparation of dual self-healing and adsorption hydrogel through hydroxypropyl chitosan (HPCS), polyacrylamide (PAM) and polyvinyl alcohol (PVA). The self-healing capability of the hydrogels without any external stimulus was ascribed to dynamic Schiff-base bonds, borate bonds and hydrogen bonds, while the adsorption capacity of hydrogels came from the protonated amino group effect at a specific pH. It was demonstrated that the HPP DN hydrogel had a maximum equilibrium swelling ratio of 643% and a maximum compressive strength of 267 kPa. The weight loss of HPP DN hydrogel was 14.26% lower than that of HPCS/PAM single network hydrogel, furthermore, HPP DN hydrogel could achieve self-healing within 10 h. Due to the large number of active groups, the adsorption capacity of Cr⁶⁺ reached 95.31 mg/g. It could adsorb in a wide pH range of 1 to 6, and could describe by pseudo-first-order kinetic model and Langmuir adsorption isotherm model, which would provide a new idea for the adsorption and removal of heavy metal ions. In short, the prepared HPP hydrogel had dual self-healing ability, adsorption capacity and mechanical strength, which would make it a promising candidate for long-life adsorbent.

已经开发了一种简便，环保的方法，用于通过羟丙基壳聚糖（HPCS），聚丙烯酰胺（PAM）和聚乙烯醇（PVA）制备双重自愈和吸附的水凝胶。在没有任何外部刺激的情况下，水凝胶的自我修复能力归因于动态席夫碱键，硼酸盐键和氢键，而水凝胶的吸附能力则来自于特定pH下的质子化氨基效应。结果表明，HPP DN水凝胶的最大平衡溶胀率为643％，最大抗压强度为267 kPa。HPP DN水凝胶的重量损失比HPCS / PAM单网络水凝胶的重量损失低14.​​26％，此外，HPP DN水凝胶可在10小时内实现自我修复。由于大量的活性基团，Cr的吸附能力⁶⁺达到95.31 mg / g。它可以在1至6的宽pH范围内吸附，并可以用拟一级动力学模型和Langmuir吸附等温线模型进行描述，这将为重金属离子的吸附和去除提供新的思路。简而言之，所制备的HPP水凝胶具有双重的自愈能力，吸附能力和机械强度，这使其成为长寿命吸附剂的有希望的候选者。