State Key Laboratory of Silkworm Genome Biology, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing 400715, China.
Key Laboratory of Sustainable Utilization of Technology Research for Fisheries Resources of Zhejiang Province, Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China.
Int J Mol Sci. 2022 Jan 31;23(3):1668. doi: 10.3390/ijms23031668.
The recycling and reuse of biomass waste for the preparation of carbon-based adsorbents is a sustainable development strategy that has a positive environmental impact. It is well known that a large amount of silk sericin (SS) is dissolved in the wastewater from the silk industry. Utilizing the SS instead of discharging it into the environment without further treatment would reduce environmental and ecological problems. However, effective enrichment of the SS from the aqueous solution is a challenge. Here, with the help of carboxymethyl chitosan (CMCS), which can form a gel structure under low voltage, an SS/CMCS hydrogel with SS as the major component was prepared via electrodeposition at a 3 V direct-current (DC) voltage for five minutes. Following a carbonization process, an SS-based adsorbent with good performance for the removal of methylene blue (MB) from an aqueous solution was prepared. Our results reveal that the SS/CMCS hydrogel maintains a porous architecture before and after carbonization. Such structure provides abundant adsorption sites facilitating the adsorption of MB molecules, with a maximum adsorptive capacity of 231.79 mg/g. In addition, it suggests that the adsorption is an exothermic process, has a good fit with the model, and follows the intra-particle diffusion model. The presented work provides an economical and feasible path for the treatment of wastewater from dyeing and printing.
生物质废料的回收和再利用用于制备碳基吸附剂是一种具有积极环境影响的可持续发展策略。众所周知，大量丝胶（SS）溶解在丝绸工业的废水中。利用 SS 代替未经进一步处理就排放到环境中，可以减少环境和生态问题。然而，从水溶液中有效富集 SS 是一个挑战。在这里，在低电压下可以形成凝胶结构的羧甲基壳聚糖（CMCS）的帮助下，通过在 3 V 直流（DC）电压下电沉积五分钟，制备了以 SS 为主要成分的 SS/CMCS 水凝胶。经过碳化过程，制备了一种基于 SS 的吸附剂，用于从水溶液中去除亚甲基蓝（MB），具有良好的性能。我们的结果表明，SS/CMCS 水凝胶在碳化前后都保持着多孔的结构。这种结构提供了丰富的吸附位点，有利于 MB 分子的吸附，最大吸附容量为 231.79 mg/g。此外，研究表明，吸附是一个放热过程，与 模型拟合良好，并遵循内扩散模型。本工作为处理印染废水提供了一种经济可行的途径。
