埃洛石管作为除草剂的纳米容器及其在可生物降解的聚乙烯醇/淀粉薄膜中的控释
Halloysite Tubes as Nanocontainers for Herbicide and Its Controlled Release in Biodegradable Poly(vinyl alcohol)/Starch Film.
作者信息
Zhong Bangchao, Wang Song, Dong Huanhuan, Luo Yuanfang, Jia Zhixin, Zhou Xiangyang, Chen Mingzhou, Xie Dong, Jia Demin
机构信息
Key Lab of Guangdong for High Property and Functional Polymer Materials, South China University of Technology , Guangzhou 510640, China.
Department of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering , Guangzhou 510225, China.
出版信息
J Agric Food Chem. 2017 Dec 6;65(48):10445-10451. doi: 10.1021/acs.jafc.7b04220. Epub 2017 Nov 17.
Commercial herbicide atrazine (AT) was first loaded into the lumen of halloysite nanotubes (HNTs) in the amount of 9 wt %, and then the AT-loaded HNTs (HNTs-AT) were further incorporated into poly(vinyl alcohol)/starch composites (PVA/ST, with the weight ratio of 80/20) to construct a dual drug delivery system. AT loaded in nanotubes displayed much slower release from PVA/ST film in water than free AT; for example, the total release amount of AT from PVA/ST film with loaded AT was only 61% after 96 h, while this value reached 97% in PVA/ST film with free AT. The release behavior of AT from PVA/ST film with HNTs-AT was first dominated by the mechanism of matrix erosion and then by the mechanism of Fickian diffusion. In addition, combining HNTs and PVA/ST blends together in the controlled release of herbicide also reduced its leaching through the soil layer, which would be useful for diminishing the environmental pollution caused by pesticide.
商用除草剂莠去津（AT）首先以9 wt%的量载入埃洛石纳米管（HNTs）内腔，然后将载有AT的HNTs（HNTs-AT）进一步掺入聚乙烯醇/淀粉复合材料（PVA/ST，重量比为80/20）中，构建双药物递送系统。载入纳米管中的AT在水中从PVA/ST薄膜中的释放比游离AT慢得多；例如，载有AT的PVA/ST薄膜中AT的总释放量在96小时后仅为61%，而在含有游离AT的PVA/ST薄膜中该值达到97%。AT从含有HNTs-AT的PVA/ST薄膜中的释放行为首先由基质侵蚀机制主导，然后由菲克扩散机制主导。此外，在除草剂的控释中将HNTs与PVA/ST共混物结合在一起还减少了其通过土壤层的淋溶，这将有助于减少农药造成的环境污染。
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