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用于马拉硫磷吸附的环境友好型β-环糊精交联纤维素/聚乙烯醇水凝胶的合成与表征

Synthesis and Characterization of Environmentally Friendly β-Cyclodextrin Cross-Linked Cellulose/Poly(vinyl alcohol) Hydrogels for Adsorption of Malathion.

作者信息

Thongrueng Maneerat, Sudsakorn Kandis, Charoenchaitrakool Manop, Seubsai Anusorn, Panchan Noppadol, Devahastin Sakamon, Niamnuy Chalida

机构信息

Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand.

Research Network NANOTEC-Kasetsart on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment: RNN-CMSEE and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industrials, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand.

出版信息

ACS Omega. 2024 May 16;9(21):22635-22649. doi: 10.1021/acsomega.4c00037. eCollection 2024 May 28.

DOI:10.1021/acsomega.4c00037
PMID:38826516
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11137713/
Abstract

The widespread use of malathion enhances agricultural plant productivity by eliminating pests, weeds, and diseases, but it may lead to serious environmental pollution and potential health risks for humans and animals. To mitigate these issues, environmentally friendly hydrogel adsorbents for malathion were synthesized using biodegradable polymers, specifically cellulose, β-cyclodextrin (β-CD), poly(vinyl alcohol) (PVA), and biobased epichlorohydrin as a cross-linker. This study investigated the effects of the cellulose-to-PVA ratio and epichlorohydrin (ECH) content on the properties and malathion adsorption capabilities of β-CD/cellulose/PVA hydrogels. It was found that the gel content of the hydrogels increased with a higher cellulose-to PVA and ECH ratio, whereas the swelling ratio decreased, indicating a denser structure that impedes water permeation. In addition, various parameters affecting the malathion adsorption capacity of the hydrogel, namely, contact time, pH, hydrogel dosage, initial concentration of malathion, and temperature, were studied. The hydrogel prepared with a β-CD/cellulose/PVA ratio of 20:40:40 and 9 mL of ECH exhibited the highest malathion adsorption rate and capacity, which indicated an equilibrium adsorption capacity of 656.41 mg g at an initial malathion concentration of 1000 mg L. Fourier transform infrared spectroscopy (FTIR), ζ-potential, and X-ray photoelectron spectroscopy (XPS) and NMR spectroscopy confirmed malathion adsorption within the hydrogel. The adsorption process followed intraparticle diffusion kinetics and corresponded to Freundlich isotherms, indicating multilayer adsorption on heterogeneous substrates within the adsorbent, facilitated by diffusion.

摘要

马拉硫磷的广泛使用通过消灭害虫、杂草和疾病提高了农业植物的生产力，但它可能导致严重的环境污染以及对人类和动物的潜在健康风险。为了缓解这些问题，使用可生物降解的聚合物，特别是纤维素、β-环糊精（β-CD）、聚乙烯醇（PVA）和生物基环氧氯丙烷作为交联剂，合成了用于马拉硫磷的环保型水凝胶吸附剂。本研究考察了纤维素与PVA的比例以及环氧氯丙烷（ECH）含量对β-CD/纤维素/PVA水凝胶的性能和马拉硫磷吸附能力的影响。结果发现，水凝胶的凝胶含量随着纤维素与PVA以及ECH比例的增加而增加，而溶胀率降低，这表明结构更致密，阻碍了水的渗透。此外，还研究了影响水凝胶马拉硫磷吸附容量的各种参数，即接触时间、pH值、水凝胶用量、马拉硫磷初始浓度和温度。以20:40:40的β-CD/纤维素/PVA比例和9 mL ECH制备的水凝胶表现出最高的马拉硫磷吸附速率和容量，这表明在初始马拉硫磷浓度为1000 mg/L时，平衡吸附容量为656.41 mg/g。傅里叶变换红外光谱（FTIR）、ζ电位、X射线光电子能谱（XPS）和核磁共振光谱证实了马拉硫磷在水凝胶中的吸附。吸附过程遵循颗粒内扩散动力学，符合弗伦德里希等温线，表明在吸附剂内的非均相底物上发生多层吸附，这是由扩散促进的。

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