Preparation and properties of modified cassava starch slow-release hydrogel with acid and alkali resistance

二氧化氯 自愈水凝胶 碱金属 聚乙烯醇 羧甲基纤维素 化学工程 化学 柠檬酸 淀粉 吸附 次氯酸钠 抗压强度 纤维素 核化学 材料科学 有机化学 复合材料 工程类
作者
Lijie Huang,Xiao-Xue Han,Qi Mo,Yanan Wang,Xiyue Wang,Yishan Li,Chongxing Huang,Qingshan Duan
出处
期刊:Industrial Crops and Products [Elsevier BV]
卷期号:206: 117699-117699 被引量:9
标识
DOI:10.1016/j.indcrop.2023.117699
摘要

Slow release of chlorine dioxide is receiving increasing attention in the field of environmental disinfection. This study focuses on the binary solid dioxide rate to improve its acid and alkali resistance. Cassava starch hydrogels were prepare as the backbone and polyvinyl alcohol (PVA) as the soft segment and were modified by adding quaternized carboxymethyl cellulose and chitin to make the hydrogel acid- and alkali- resistant. Subsequently, sodium bicarbonate was introduced to make the hydrogel porous, thereby solving the problem whereby binary solid chlorine dioxide is corroded by acid and alkali during the slow-release process of chlorine dioxide, thus resulting in poor mechanical properties. The chemical structure and morphology of the cassava starch-based composite hydrogels were confirmed by solid-state nuclear magnetic resonance and other methods. Measurements of the compressive properties with different pH solutions demonstrated the acid and alkali resistance of the modified hydrogel was the strongest at pH= 3.5 and pH= 10.5 with compressive stresses of 200.47 kPa and 180.65 kPa. The cumulative chlorine dioxide release curves were in good agreement with the first-order kinetic model, and R2 values were all greater than 0.95. This research offers broad applications in environmental disinfection, fruit and vegetable preservation, and wastewater adsorption.
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