Recycled waste black polyurethane sponges for solar vapor generation and distillation. (15th November 2017)

• Record Type: Journal Article
• Authors: Ma, Sainan; Chiu, Chun Pang; Zhu, Yujiao; Tang, Chun Yin; Long, Hui; Qarony, Wayesh; Zhao, Xinhua; Zhang, Xuming; Lo, Wai Hung; Tsang, Yuen Hong
• Is Part Of: Applied energy. Volume 206(2017)
• Page Start: 63
• Page End: 69
• Publication Date: 2017-11-15
• Subjects: Solar vapor generation -- Heat localization -- Black sponge -- Recycled -- Hydrophilic -- Solar distillation; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2017.08.169
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: 1st demonstration of recycled black sponge for solar evaporation and distillation. The black sponge was surface modified for performance enhancement. Solar evaporation efficiency was more than 3.5 times higher than natural process. Solar ethanol distillation up to 25 wt% concentration promotion was achieved. The mechanisms of the enhanced solar energy conversion were proposed. Abstract: The abundant waste polyurethane sponge, commonly considered as one of the municipal wastes, can be recycled and converted into the valuable resources of environment. The increasing landfill cost and air-pollutions have made it a great urgent to develop the effective applications of waste polyurethane sponge. Recently, solar vapor generation has attracted extensive attentions, since energy shortage and water scarcity along with water pollution are becoming alarming global issues to be addressed. The solar vapor generation relies on the performance of the solar absorbers which convert the solar energy into heat for the vaporization process. A low cost, efficient and durable solar absorber is vital for the development of solar vapor generation. Here, we report that the recycled self-floating black polyurethane sponges are very promising solar absorber materials. which can efficiently generate water vapor after a simple one-step hydrophilic treatment with dopamine hydrochloride. The evaporating rate was more than 3.5 times higher compared to that of the existing natural evaporation process, exhibiting an evaporation efficiency of above 50%. Furthermore, this black polyurethane sponge can also drive solar ethanol distillation, yielding up to 25 wt% concentration promotion under each distillation cycle.