Qin Zhen, Sun Hang, Tang Yanan, Yang Xiangyu, Kong Liang, Yin Shengyan, Li Mo, Liang Song, Liu Zhenning
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin 130022, China.
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin 130022, China.
J Colloid Interface Sci. 2023 Jun 15;640:647-655. doi: 10.1016/j.jcis.2023.02.156. Epub 2023 Mar 5.
Solar-driven water purification has been deemed as a cheap, green and renewable technology to mitigate water shortage and pollution. Herein, a biomass aerogel with hydrophilic-hydrophobic Janus structure has been prepared as solar water evaporator, which is achieved by partially modifying hydrothermal-treated loofah sponge (HLS) with reduced graphene oxide (rGO). It's a rare design philosophy that HLS serves as a substrate with large pores and hydrophilic properties to ensure continuous and effective water transport, and the hydrophobic layer with rGO modification guarantees good salt resistance in seawater desalination with high photothermal conversion efficiency. As a result, the obtained Janus aerogel, p-HLS@rGO-12, exhibits impressive solar-driven evaporation rates of 1.75 kg mh and 1.54 kg mh for pure water and seawater respectively, with good cycling stability in the evaporation process. Furthermore, p-HLS@rGO-12 also demonstrates outstanding photothermal degradation of rhodamine B (greater than98.8 % in 2 h) and sterilization of E. coli (nearly 100 % in 2 h). This work offers an unusual approach to achieve highly efficient solar-driven steam generation, seawater desalination, organic pollutant degradation, and water disinfection simultaneously. The prepared Janus biomass aerogel holds great potential application in the field of seawater desalination and wastewater purification.
太阳能驱动的水净化被认为是一种廉价、绿色且可再生的技术，可缓解水资源短缺和污染问题。在此，一种具有亲水 - 疏水双面结构的生物质气凝胶已被制备用作太阳能水蒸发器，这是通过用还原氧化石墨烯（rGO）对水热处理后的丝瓜海绵（HLS）进行部分改性来实现的。一种罕见的设计理念是，HLS作为具有大孔和亲水特性的基底，以确保连续且有效的水传输，而经rGO改性的疏水层在海水淡化中具有良好的耐盐性且光热转换效率高。结果，所获得的双面气凝胶p - HLS@rGO - 12在纯水和海水中分别展现出令人印象深刻的太阳能驱动蒸发速率，分别为1.75 kg m⁻² h⁻¹和1.54 kg m⁻² h⁻¹，并且在蒸发过程中具有良好的循环稳定性。此外，p - HLS@rGO - 12还对罗丹明B表现出出色的光热降解性能（2小时内大于98.8%）以及对大肠杆菌的杀菌性能（2小时内接近100%）。这项工作提供了一种不同寻常的方法，可同时实现高效的太阳能驱动蒸汽产生、海水淡化、有机污染物降解和水消毒。所制备的双面生物质气凝胶在海水淡化和废水净化领域具有巨大的潜在应用价值。
