Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China.
The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institute of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, Zhejiang, 310022, China.
Small. 2023 May;19(18):e2206189. doi: 10.1002/smll.202206189. Epub 2023 Jan 31.
Macroscopic 3D porous materials are ideal solar evaporators for water purification. However, the limited sunlight intensity and penetrating depth during solar-driven evaporation cannot prevent the biofouling formation by photothermal effect, thus leading to the deterioration of evaporation rate. Herein, a magnetic heating strategy is reported for anti-biofouling solar steam generation based on a magnetic silk fibroin (SF) scaffold with bi-heating property. Under one sun, the solar-heated top surface of magnetic SF scaffolds accelerates water evaporation at 2.03 kg m h , while the unheated inner channels suffer from the formation of biofilm. When exposed to alternating magnetic field (AMF), the magnetic SF scaffold can be integrally heated, leading to an efficient inner temperature to prevent biofouling in channels for water transportation. Accordingly, magneto-heated scaffolds show steady water evaporation rates after exposure to S. aureus and E. coli, which maintained 93.6-94.6% of original performance. In contrast, the evaporation rates of the scaffolds without AMF treatment are reduced to 1.31 (S. aureus) and 1.32 (E. coli) kg m h , decreased by 35.5% and 35.0%, respectively. In addition, the magneto-heated scaffold inhibits biofouling formation in natural lake water, maintaining 99.5% original performance.
宏观 3D 多孔材料是理想的太阳能蒸发器，可用于水净化。然而，在太阳能驱动蒸发过程中，有限的阳光强度和穿透深度不能防止光热效应引起的生物污垢形成，从而导致蒸发速率下降。本文报道了一种基于具有双热性能的磁性丝素（SF）支架的抗生物污染太阳能蒸汽产生的磁加热策略。在一个太阳下，磁性 SF 支架的太阳能加热上表面可将水蒸发加速至 2.03 kg m h ，而未加热的内部通道则会形成生物膜。当暴露于交变磁场（AMF）时，磁性 SF 支架可以整体加热，从而实现高效的内部温度，防止通道内的水输送过程中发生生物污垢。因此，经过金黄色葡萄球菌和大肠杆菌的暴露后，磁加热支架能够保持稳定的水蒸发率，其原始性能维持在 93.6-94.6%。相比之下，未进行 AMF 处理的支架的蒸发率分别降低至 1.31（金黄色葡萄球菌）和 1.32（大肠杆菌）kg m h ，降低了 35.5%和 35.0%。此外，磁加热支架还能抑制天然湖水中的生物污垢形成，保持 99.5%的原始性能。
