Department of Chemistry, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India.
Centre for Advanced Electronics (CAE), Indian Institute of Technology (IIT) Indore, Simrol, Khandwa Road, Indore 453552, India.
Mater Horiz. 2024 Oct 14;11(20):5114-5122. doi: 10.1039/d4mh00591k.
Solar-driven interfacial evaporation has emerged as an efficient approach for wastewater treatment and seawater desalination. New trends demand adaptive technology to develop photothermal membranes with multifunctional features. Herein, we report a robust multi-purpose near-infrared (NIR)-active hydrogel composite (-BC@N-LCD) from broad-spectrum active nitrogen-doped lignin-derived carbon dots (N-LCDs) covalently cross-linked with a bacterial cellulose (BC) matrix. BC provides adequate porosity and hydrophilicity required for easy water transport while managing heat loss. A commendable evaporation rate (ER) of 2.2 kg m h under one sun (1 kW m) is achieved by -BC@N-LCD. The developed hydrogel system is also found to be efficient for desalination (∼2.1 kg m h) and for remediating various pollutants (heavy metal ions, dyes, and pharmaceuticals) from feed water. The efficacy of the membrane remains unaltered by different grades of water, and hence can be adoptable for economically stressed communities living in water-polluted regions as well as those residing in coastal areas.
太阳能驱动的界面蒸发作为一种高效的废水处理和海水淡化方法已经出现。新的趋势要求适应性技术来开发具有多功能特性的光热膜。在这里，我们报告了一种来自广谱活性氮掺杂木质素衍生碳点（N-LCD）的坚固的多用途近红外（NIR）活性水凝胶复合材料（-BC@N-LCD），该材料通过细菌纤维素（BC）基质共价交联。BC 提供了足够的孔隙率和亲水性，有利于水的输送，同时控制热量损失。-BC@N-LCD 的蒸发率（ER）高达 2.2 kg m h，在一个太阳（1 kW m）下。所开发的水凝胶系统还被发现对海水淡化（约 2.1 kg m h）和从原水中去除各种污染物（重金属离子、染料和药物）有效。该膜的功效不受不同等级水的影响，因此可以适应生活在水污染地区的经济拮据社区以及生活在沿海地区的社区。
