2020
DOI: 10.1002/ente.202000567
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Turning Trash into Treasure: Pencil Waste–Derived Materials for Solar‐Powered Water Evaporation

Abstract: Solar steam generation is regarded as one of the most attractive technologies to relieve the stress of freshwater storage. Low cost and scalable production of solar evaporators is a critical issue to be considered for practical applications. Herein, the recycling utilization of pencil wastes is proposed by a facile method. A self‐floating solar evaporator made of carbonized pencil wastes can achieve an evaporation rate of 1.2 kg m−2 h−1 and a light‐to‐vapor energy conversion efficiency of 82.2% under 1.0 sun. … Show more

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Cited by 23 publications
(6 citation statements)
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References 65 publications
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“…Carbonizing Platanus fruits requires a two-step heating (180 °C for 1 h and 600 °C for 1 h) for processing a three-dimensional (3D) spherical structure for solar evaporation of water, showing an evaporation efficiency of 81.3%. 33 Similarly carbonized waste products like pencil shavings (900 °C for 5 h) 34 and coffee grounds (1000 °C) 4 require high energy for processing and show efficiencies of 82.2 and 71.7% respectively, under 1 sun illumination.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Carbonizing Platanus fruits requires a two-step heating (180 °C for 1 h and 600 °C for 1 h) for processing a three-dimensional (3D) spherical structure for solar evaporation of water, showing an evaporation efficiency of 81.3%. 33 Similarly carbonized waste products like pencil shavings (900 °C for 5 h) 34 and coffee grounds (1000 °C) 4 require high energy for processing and show efficiencies of 82.2 and 71.7% respectively, under 1 sun illumination.…”
Section: Introductionmentioning
confidence: 99%
“…Carbonizing natural biomass (i.e., loofah, bamboo, mushrooms, lotus seedpods, and so forth) as well as waste (i.e. coffee grounds, pencil shavings, moldy bread) ,, is another way of making solar absorbers for solar thermal evaporation of water. However, carbonizing these biomass or wastes requires a very high temperature, which is energy consuming.…”
Section: Introductionmentioning
confidence: 99%
“…Du et al [ 139 ] prepared resorcinol–formaldehyde (RF) aerogel by sol–gel polymerization, and carbonized it to obtain carbon black aerogel (CA), which was used as an SSGD under 1 sun irradiation with evaporation rate of 1.29 kg m −2 h −1 , and the water evaporation rate can be increased to 1.37 kg m −2 h −1 after CO 2 activation; the corresponding evaporation efficiency was 87.5%. The crosslinked aromatic polymer porous foam (PDVB–PS) was prepared by one‐step hydrothermal method using styrene as monomer and two vinyl benzene as crosslinking agent by Li.…”
Section: Polymer‐based Solar Steam Generatorsmentioning
confidence: 99%
“…One way to valorize agro-wastes is via pyrolysis into biochar [1], under inert atmosphere or in the presence of very low amount of air [2][3][4]. "Biochar" is nowadays a very hot research topic because it arises from the Trash-to-Treasure concept [5,6], and thus falls within the general domain of sustainable development [7]. Much has been said on the preparation of biochar [8], and control of its composition [9], graphitization degree [10] and porosity [11] among other features [2,12,13].…”
Section: Introductionmentioning
confidence: 99%