College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China.
College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China.
Carbohydr Polym. 2022 May 15;284:119179. doi: 10.1016/j.carbpol.2022.119179. Epub 2022 Jan 26.
In this work, chitosan‑sodium alginate polysaccharide hydrogel (CS-SA(GA)) was rationally designed and synthesized via electrostatic and covalent interactions. The structure and morphologies of the hydrogel were characterized, and the results showed CS-SA(GA) with a layered and loose structure by virtue of glutaraldehyde (GA) cross-linking agent introduction. On the one hand, the porous and loose structure of the adsorbent facilitated the removal of chromium (III) from the tannery effluent. Furthermore, after chromium (III) adsorption, CS-SA(GA)-Cr(III) could be mechanically degraded to CS/SA/GA/Cr(III) sol by a drum, avoiding traditional high-temperature, high-pressure reactor application. Due to the retanning and filling effects of CS/SA/GA/Cr(III) sol, the chemical and physical properties of the finished leather were improved. Based on these, this work aims to provide a strategy that integrates chromium (III)-containing tanning effluent treatment and retanning/filling resource utilization of adsorbent/adsorbate, which is an effective alternative on account of its convenient operation, environmental sustainability, and wide adaptability.
在这项工作中，通过静电和共价相互作用合理设计和合成了壳聚糖-海藻酸钠多糖水凝胶（CS-SA(GA)）。对水凝胶的结构和形态进行了表征，结果表明，由于引入戊二醛（GA）交联剂，CS-SA(GA)具有层状和疏松的结构。一方面，吸附剂的多孔疏松结构有利于从制革废水中去除铬（III）。此外，在吸附铬（III）后，CS-SA(GA)-Cr(III) 可以通过滚筒机械降解为 CS/SA/GA/Cr(III)溶胶，避免了传统高温、高压反应器的应用。由于 CS/SA/GA/Cr(III)溶胶的复鞣和填充作用，提高了成品革的化学和物理性能。基于这些，本工作旨在提供一种将含铬（III）制革废水处理与吸附剂/吸附物的复鞣/填充资源利用相结合的策略，由于其操作方便、环境可持续性和广泛的适应性，是一种有效的替代方法。
