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Solid waste and graphite derived solar steam generator for highly-efficient and cost-effective water purification

Author

Listed:
  • Gong, Feng
  • Wang, Wenbin
  • Li, Hao
  • Xia, Dawei (David)
  • Dai, Qingwen
  • Wu, Xinlin
  • Wang, Mingzhou
  • Li, Jian
  • Papavassiliou, Dimitrios V.
  • Xiao, Rui

Abstract

Utilizing the clean and renewable solar energy to generate steam for wastewater purification or seawater desalination is a promising solution to the worldwide scarcity of fresh water. Herein, we report a highly-efficient, eco-friendly and cost-effective solar steam generator based on ball-milling graphite and cellulose fiber from waste paper. Ball-milling graphite/cellulose fiber composite aerogels are facilely developed via a freeze casting-drying method, endowing a featured vertically aligned porous structure. The fabrication of composite aerogels and the construction of evaporation systems take full advantages of recycled materials, contributing to the low cost and solid waste reclamation. High porosity, strong solar absorption, hydrophilicity and low thermal conductivity of the composite aerogels collectively contribute to a splendid solar evaporation rate of water as high as 1.61 kg m−2 h−1, with photothermal efficiency of ~90% under one sun illumination (1 kW m−2). Quantitative studies reveal the effects of ball-milling graphite/cellulose fiber ratio, ball-milling graphite concentration and thickness of composite aerogels on the solar evaporation rates, suggesting the optimal design of composite aerogels. Furthermore, the cycling stability and the capability for seawater desalination as well as polluted water purification manifest the potential of the composite aerogels to purify diverse water. Outdoor tests show 8–13 L of fresh water could be produced daily by 1 m2 of composite aerogel.

Suggested Citation

  • Gong, Feng & Wang, Wenbin & Li, Hao & Xia, Dawei (David) & Dai, Qingwen & Wu, Xinlin & Wang, Mingzhou & Li, Jian & Papavassiliou, Dimitrios V. & Xiao, Rui, 2020. "Solid waste and graphite derived solar steam generator for highly-efficient and cost-effective water purification," Applied Energy, Elsevier, vol. 261(C).
    • Handle: RePEc:eee:appene:v:261:y:2020:i:c:s0306261919320975
    DOI: 10.1016/j.apenergy.2019.114410
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    2. Lv, Yulin & Gong, Feng & Li, Hao & Zhou, Qiang & Wu, Xinlin & Wang, Wenbin & Xiao, Rui, 2020. "A flexible electrokinetic power generator derived from paper and ink for wearable electronics," Applied Energy, Elsevier, vol. 279(C).
    3. Gong, Biyao & Yang, Huachao & Wu, Shenghao & Tian, Yikuan & Yan, Jianhua & Cen, Kefa & Bo, Zheng & Ostrikov, Kostya (Ken), 2021. "Phase change material enhanced sustained and energy-efficient solar-thermal water desalination," Applied Energy, Elsevier, vol. 301(C).
    4. Zhang, Qian & Hu, Run & Chen, Yali & Xiao, Xingfang & Zhao, Guomeng & Yang, Hongjun & Li, Jinhua & Xu, Weilin & Wang, Xianbao, 2020. "Banyan-inspired hierarchical evaporators for efficient solar photothermal conversion," Applied Energy, Elsevier, vol. 276(C).
    5. Ge, Fangqing & Fei, Liang & Chen, Xin & Yin, Yunjie & Wang, Chaoxia, 2023. "Light-colored solar-driven PANI/polyacrylonitrile fiber with low-temperature resistance for wearable heater," Renewable Energy, Elsevier, vol. 206(C), pages 949-959.

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