ITMO University, St. Petersburg, 197101, Russia.
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, 220072, Belarus.
Carbohydr Polym. 2019 Apr 15;210:135-143. doi: 10.1016/j.carbpol.2019.01.045. Epub 2019 Jan 14.
The article presents the results of the synthesis and research of a new biodegradable hybrid nanosized polymer-inorganic system possessing the double nature of heavy metal ions extraction from solutions. Firstly, the sorption of metal ions takes place by the ion-exchange properties of porous manganese oxide and, secondly, due to specific interaction and chelating with functional groups of polysaccharides in terms of nanochitin (ChNC). The synthesis is based on the colloid-chemical processes of interaction between polysaccharide and manganese oxide nanosized particles. Using the mathematical model of the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory, it has been shown that this interaction occurs due to the formation of hydrogen bonds and electrostatic interactions of oppositely charged particles. Hybrid sorbents were characterised by X-ray diffraction, Fourier transform infrared spectroscopy, Transmission electron and Atomic force microscopy. The highest value of sorption capacity for hybrid materials was obtained for Ni extraction and reached 114.0 ± 1.1 mg/g. It was shown that biodegradation of hybrid sorbents increases with the concentration of manganese oxide nanoparticles and almost complete degradation of the organic part can be performed within 6 days. The obtained biodegradable sorbents were designed to address ecological problems connected with the pollution of natural waters by toxic metallic ions.
本文介绍了一种新型可生物降解的混合纳米聚合物-无机体系的合成和研究结果，该体系具有从溶液中提取重金属离子的双重性质。首先，通过多孔氧化锰的离子交换特性来吸附金属离子，其次，由于纳米壳聚糖（ChNC）中的功能基团与金属离子之间的特殊相互作用和螯合作用。该合成基于多糖与纳米氧化锰颗粒之间的胶体化学相互作用过程。利用德加古因、朗道、维尔韦和奥弗贝克（DLVO）理论的数学模型表明，这种相互作用是由于形成氢键和带相反电荷的粒子之间的静电相互作用而发生的。采用 X 射线衍射、傅里叶变换红外光谱、透射电子显微镜和原子力显微镜对混合吸附剂进行了表征。对于 Ni 的提取，混合材料的最大吸附容量最高，达到 114.0 ± 1.1 mg/g。研究表明，随着纳米氧化锰颗粒浓度的增加，混合吸附剂的生物降解性增加，在 6 天内几乎可以完全降解有机部分。所得到的可生物降解吸附剂旨在解决与有毒金属离子污染天然水有关的生态问题。
