College of Resources and Environment, Jilin Agricultural University, Changchun 130118, People's Republic of China.
College of Plant protection, Jilin Agricultural University, Changchun 130118, People's Republic of China.
Carbohydr Polym. 2022 Jan 15;276:118735. doi: 10.1016/j.carbpol.2021.118735. Epub 2021 Oct 6.
Chitosan was prepared by hydrothermal deacetylation from multi-step protein purification chitin based on Trypoxylus dichotomus, for treating heavy metals and antibiotics. Chitosan with higher deacetylation degree and lower molecular weight were synthesized. The adult chitosan was composed of nanofibers arranged more evenly, showing higher yield, thermal stabilities and antimicrobial properties. The adsorption capacities of Cu and Fe were 462 and 270 mg/g, lower than 934 mg/g of Pb. Levofloxacin and tetracycline hydrochloride adsorption capacity were 26 and 22 mg/g, lower than 67 mg/g of sulfamethoxazole. In addition, compared with single pollutants, the adsorption of sulfamethoxazole and Pb can increase by 6% and 5% when they act as composite contaminants. The adsorption procedure can be well described by pseudo-second-order kinetics and Langmuir isothermal model, indicating it a homogeneous monolayer chemisorption. Therefore, the Trypoxylus dichotomus source chitosan prepared by hydrothermal deacetylation has potential applications in the adsorption of complex pollutants.
几丁聚糖是从以双斑蟋为原料的多步蛋白纯化几丁质经水热脱乙酰化制备得到的，用于处理重金属和抗生素。合成了脱乙酰度更高、分子量更低的几丁聚糖。成虫几丁聚糖由排列更均匀的纳米纤维组成，表现出更高的产率、热稳定性和抗菌性能。Cu 和 Fe 的吸附量分别为 462 和 270 mg/g，低于 Pb 的 934 mg/g。左氧氟沙星和盐酸四环素的吸附量分别为 26 和 22 mg/g，低于磺胺甲恶唑的 67 mg/g。此外，与单一污染物相比，当磺胺甲恶唑和 Pb 作为复合污染物存在时，吸附量分别增加了 6%和 5%。吸附过程可以很好地用伪二级动力学和 Langmuir 等温模型来描述，表明这是一种均匀的单层化学吸附。因此，经水热脱乙酰化制备的双斑蟋源几丁聚糖在复合污染物的吸附中具有潜在的应用价值。
