Li Shuhong, Yang Fan, Xiang Kailing, Chen Jiacheng, Zhang Ye, Wang Jincheng, Sun Jibo, Li Yuan
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, P. R. China.
Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J.-A. de Baïf, F-75013 Paris, France.
Langmuir. 2022 May 10;38(18):5717-5729. doi: 10.1021/acs.langmuir.2c00317. Epub 2022 Apr 20.
A multifunctional microspheric soil conditioner based on chitosan-grafted poly(acrylamide--acrylic acid)/biochar [CS--P(AM--AA)/BC] was prepared. First, the P(AM--AA) was synthesized and successfully grafted onto CS, and the three-dimensional network structure of microspheres was formed with ,-methylenebis(acrylamide) as the cross-linking agent according to the inverse suspension polymerization method. Meanwhile, BC and urea were encapsulated into the body of microspheres during the polymerization. The structure of the microspheres was analyzed by Fourier transform infrared spectroscopy, polarized optical microscopy, and scanning electron microscopy, and the mechanism of adsorption of Cu on the microspheres was investigated by X-ray photoelectron spectroscopy. Furthermore, the experimental results demonstrated the excellent water absorption and retention capabilities of microspheres, and the release rate of urea was dramatically reduced. Importantly, the introduction of BC significantly enhanced the adsorption performance of the microspheres with respect to heavy metal ions. Consequently, the multifunctional soil conditioner held promise for use in soil improvement and agricultural production.
制备了一种基于壳聚糖接枝聚（丙烯酰胺-丙烯酸）/生物炭[CS-P(AM-AA)/BC]的多功能微球形土壤改良剂。首先，合成了P(AM-AA)并成功接枝到CS上，按照反相悬浮聚合法，以N,N'-亚甲基双丙烯酰胺为交联剂形成微球的三维网络结构。同时，在聚合过程中将生物炭和尿素包封入微球体内。通过傅里叶变换红外光谱、偏光显微镜和扫描电子显微镜对微球结构进行了分析，并通过X射线光电子能谱研究了微球对铜的吸附机理。此外，实验结果表明微球具有优异的吸水保水能力，尿素的释放速率显著降低。重要的是，生物炭的引入显著提高了微球对重金属离子的吸附性能。因此，这种多功能土壤改良剂在土壤改良和农业生产中具有应用前景。
