Coffee grounds-based hydrogel as a high-performance and durable evaporator for solar-driven freshwater generation

材料科学 蒸发器 海水淡化 太阳能蒸馏器 化学工程 工艺工程 工程物理 机械工程 遗传学 生物 热交换器 工程类
作者
Weichao Dong,Fangfang Zhou,Xiangju Song,Na Xue,Hongzhi Cui,Hui Peng,Heqing Jiang
出处
期刊:Materials Today Energy [Elsevier BV]
卷期号:30: 101187-101187 被引量:6
标识
DOI:10.1016/j.mtener.2022.101187
摘要

Solar-driven desalination has emerged as a promising technology to mitigate the water crisis. However, challenges in developing cost-effective, eco-friendly, and durable solar evaporators from readily available materials still exist. Herein, a high-performance evaporator was developed by directly employing natural coffee grounds (CGs), a common biomass waste with huge annual discharge. The original CG particles adhere firmly to calcium alginate (CA) skeleton through a one-step freeze-drying and ionic crosslinking, thus showing outstanding mechanical properties and stability of the CG-CA composite. The formed three-dimensional honeycomb framework as well as the strong intervention of water jointly reduce the reflectance of incident photons, this enables CG-CA to display broad sunlight absorption in the wet state. As for the employed CG, no special treatment or functional processing is required. Combined with rational control of the morphology, the enlarged side surface of hydrogel acts as a cold evaporation surface to acquire energy from the surrounding, delivering an improved seawater evaporation rate of 1.59 kg m − 2 h − 1 with a clean water production rate of 0.62 kg m − 2 h − 1 under one sun illumination. The exploited solar evaporator derived from biomass waste CG suggests a practical, sustainable, and eco-friendly approach for efficient solar desalination, also for effective waste recycling. • A natural coffee grounds-based hydrogel with hydrophilic three-dimensional honeycomb pores was constructed. • The eco-friendly hydrogel displayed excellent mechanical properties and stability. • Good light capture capacity and water desalination performance were exhibited.
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