Fu Zhengquan, Li Ming, Li Yuanhang, Zhang Zhiyuan, Wang Di, Wang Chengyu, Li Jian
Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China.
Engineering Research Center of Advanced Wooden Materials (Ministry of Education), Northeast Forestry University, Harbin 150040, China.
Gels. 2021 Oct 18;7(4):173. doi: 10.3390/gels7040173.
After entering in water, Fe is enriched in the human body and along the food chain, causing chronic poisoning and irreversible harm to human health. In order to solve this problem, we synthesized citric acid POSS (CAP) from aminopropyl POSS (OAP) and citric acid. Then, we synthesized fluorescent hydrogels (CAP-agarose hydrogel, CAHG) with CAP and agarose. The luminescence mechanism of CAP was investigated by theoretical calculation. CAP plays a dual role in composite hydrogels: one is to give the gels good fluorescence properties and detect Fe; the second is that the surface of CAP has a large content of carbonyl and amide groups, so it can coordinate with Fe to enhance the adsorption properties of hydrogels. The experimental results show that the lowest Fe concentration that CAHG can detect is 5 μmol/L, and the adsorption capacity for Fe is about 26.75 mg/g. In a certain range, the fluorescence intensity of CAHG had an exponential relation with Fe concentration, which is expected to be applied to fluorescence sensors. Even at a lower concentration, CAHG can effectively remove Fe from the solution. The prepared fluorescent hydrogel has great potential in the field of fluorescent probes, fluorescent sensors, and ion adsorption. Besides, CAHG can be used as photothermal material after adsorbing Fe, allowing for material recycling and reducing material waste.
进入水体后，铁在人体中富集并沿着食物链传递，对人体健康造成慢性中毒和不可逆转的危害。为了解决这个问题，我们以氨丙基倍半硅氧烷（OAP）和柠檬酸合成了柠檬酸倍半硅氧烷（CAP）。然后，我们用CAP和琼脂糖合成了荧光水凝胶（CAP-琼脂糖水凝胶，CAHG）。通过理论计算研究了CAP的发光机理。CAP在复合水凝胶中起双重作用：一是赋予凝胶良好的荧光性能并检测铁；二是CAP表面含有大量的羰基和酰胺基团，因此它可以与铁配位以增强水凝胶的吸附性能。实验结果表明，CAHG能够检测到的最低铁浓度为5μmol/L，对铁的吸附容量约为26.75mg/g。在一定范围内，CAHG的荧光强度与铁浓度呈指数关系，有望应用于荧光传感器。即使在较低浓度下，CAHG也能有效从溶液中去除铁。制备的荧光水凝胶在荧光探针、荧光传感器和离子吸附领域具有巨大潜力。此外，CAHG吸附铁后可作为光热材料，实现材料循环利用并减少材料浪费。
