Mei Zhenying, Szczepanski Caroline R, Montreuil Olivier, Kuzhir Pavel, Godeau Guilhem
Université Côte d'Azur, CNRS UMR 7010 INPHYNI, 17 rue Julien Laupêtre, 06200 Nice, France.
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA.
Int J Biol Macromol. 2024 Sep 16;280(Pt 1):135605. doi: 10.1016/j.ijbiomac.2024.135605.
Chitosan, a natural polysaccharide, has attracted considerable attention as an environmentally friendly and highly efficient adsorbent for dye removal. It is usually produced by deacetylation or partial deacetylation of chitin. However, conventional sources of chitin and chitosan are limited, prompting the need for alternative sources with improved adsorption capabilities. Herein, this study focuses on exploring a novel chitin and chitosan source derived from the dung beetle and evaluates its potential for organic dye removal from aqueous solutions. The research involves the extraction and characterization of chitin and chitosan from dung beetle Heteronitis castelnaui (Harold, 1865) using various analytical techniques, including SEM, FT-IR, TGA, XRD, NMR, deacetylation degree and elemental analysis. The chitosan obtained was used for the formation of hydrogels with sodium alginate via cross-linking with calcium chloride. And then the prepared hydrogels were evaluated for its adsorption capacity through batch adsorption experiments using methylene blue as a model pollutant. The adsorption capacity for methylene blue was 1294.3 mg/g at room temperature with solution pH = 12, MB concentration of 1800 mg/L. Furthermore, the kinetics of the adsorption process were analyzed using pseudo-first-order and pseudo-second-order models to understand the rate of adsorption. The maximum adsorption capacities were determined using Langmuir and Freundlich isotherm models. This study provides valuable insights for the development of sustainable dye adsorption technologies, specifically investigating a novel chitosan source derived from the dung beetle.
壳聚糖是一种天然多糖，作为一种环境友好型高效吸附剂用于去除染料，已引起了广泛关注。它通常由几丁质脱乙酰化或部分脱乙酰化制得。然而，传统的几丁质和壳聚糖来源有限，这促使人们需要寻找具有更高吸附能力的替代来源。在此，本研究聚焦于探索一种源自蜣螂的新型几丁质和壳聚糖来源，并评估其从水溶液中去除有机染料的潜力。该研究涉及使用多种分析技术，包括扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、热重分析（TGA）、X射线衍射（XRD）、核磁共振（NMR）、脱乙酰度和元素分析，从蜣螂Heteronitis castelnaui（哈罗德，1865年）中提取和表征几丁质和壳聚糖。所获得的壳聚糖通过与氯化钙交联用于与海藻酸钠形成水凝胶。然后，以亚甲基蓝作为模型污染物，通过批量吸附实验评估所制备水凝胶的吸附容量。在室温下，溶液pH = 12、亚甲基蓝浓度为1800 mg/L时，对亚甲基蓝的吸附容量为1294.3 mg/g。此外，使用准一级和准二级模型分析吸附过程的动力学，以了解吸附速率。使用朗缪尔和弗伦德里希等温线模型确定最大吸附容量。本研究为可持续染料吸附技术的发展提供了有价值的见解，特别是对源自蜣螂的新型壳聚糖来源进行了研究。
