Li Xin, Feng Jionghao, Wang Haijun, Petrescu Florian Ion Tiberiu, Li Ying
The Key Laboratory of Food Colloids and Biotechnology, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
Department of Mechanisms and Robots Theory, Bucharest Polytechnic University, 060042 Bucharest, Romania.
Membranes (Basel). 2023 Jul 5;13(7):648. doi: 10.3390/membranes13070648.
When the typical solar-driven hydrogel water evaporator treats the organic sewage, the organic pollutants will be accumulated in the evaporator and affect the evaporation performance. This issue is resolved by using silver-disulfide bonding to fix the silver oxide/silver (AgO/Ag) nanoparticles inside the polyacrylamide-acrylic acid hydrogel, resulting in the photocatalytic degradation of methyl orange and solar-driven water evaporation. AgO/Ag nanoparticles are a solar-thermal conversion material used to replace the traditional carbon material. On the one hand, the heterojunction structure of AgO/Ag enhances the separation ability of the photogenerated carriers, thereby increasing the photocatalytic efficiency. On the other hand, the surface of the nanoparticles is grafted with N, N'-bis(acryloyl) cystamine and becomes the crosslinking agent which is fixed in the hydrogel. Meanwhile, the inverted pyramid structure can be built at the surface of the hydrogel by soft imprinting technology. This kind of structure has excellent light trapping performance, which can increase the efficiency of AgO/Ag photocatalysis. Furthermore, the dynamic reversible coordination effect between Fe and carboxyl realizes the self-healing capability of the hydrogel. Here are the properties of hydrogel: the fracture stress is 0.35 MPa, the fracture elongation is 1320%, the evaporation rate is 1.2 kg·m·h, and the rate of the photocatalytic degradation of methyl orange is 96% in 3 h. This self-healing hydrogel membrane provides a strategy to steadily get clean water from organic sewage.
当典型的太阳能驱动水凝胶蒸发器处理有机污水时，有机污染物会在蒸发器中积累并影响蒸发性能。通过使用硫化银键合将氧化银/银（AgO/Ag）纳米颗粒固定在聚丙烯酰胺-丙烯酸水凝胶内部，解决了这个问题，从而实现了甲基橙的光催化降解和太阳能驱动的水蒸发。AgO/Ag纳米颗粒是一种用于替代传统碳材料的太阳能-热转换材料。一方面，AgO/Ag的异质结结构增强了光生载流子的分离能力，从而提高了光催化效率。另一方面，纳米颗粒表面接枝了N，N'-双（丙烯酰基）胱胺并成为固定在水凝胶中的交联剂。同时，通过软压印技术可以在水凝胶表面构建倒金字塔结构。这种结构具有优异的光捕获性能，可以提高AgO/Ag光催化的效率。此外，Fe与羧基之间的动态可逆配位效应实现了水凝胶的自愈能力。水凝胶具有以下性能：断裂应力为0.35MPa，断裂伸长率为1320%，蒸发速率为1.2kg·m⁻²·h⁻¹，甲基橙在3小时内的光催化降解率为96%。这种自愈水凝胶膜为从有机污水中稳定获取清洁水提供了一种策略。
