Upcycling simulated food wastes into superactivated hydrochar for remarkable hydrogen storage
Upcycling simulated food wastes into superactivated hydrochar for remarkable hydrogen storage
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DOI：
10.1016/j.jaap.2021.105322
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发表时间：
2021-09
影响因子：
6
通讯作者：
A. Sultana;Nepu Saha;M. Reza
中科院分区：
文献类型：
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作者：
A. Sultana;Nepu Saha;M. Reza
为了开发储氢材料，本研究的目的是探索丰富的食物垃圾生物质作为开发可显著储氢的多孔炭材料的潜力。因此，在本研究中，模拟食物垃圾是六种常用食物(苹果、面包、绿豆、卷心菜、奶酪和鸡肉罐头)的混合物，在220 °C下进行水热碳化，然后在800 °C下使用不同的活化剂(KOH)与食物垃圾的氢化焦比(即2：1、3：1和4：1)进行化学活化。利用X-射线衍射仪和77 K下的氮气吸附等温线对固体产物进行了表征，包括表面孔隙率参数(比表面积、孔体积和孔径分布)的变化。然后在77 K和0-23 bar的不同压力下测量了超活性加氢焦的重量(wt%)储氢量。结果表明，超活性加氢煤焦的比表面积为2070~2885m2/g，总孔容为0.98cm3/g~1.93cm3/g，比表面积为2070~2885m2/g，总孔容为0.98~1.93cm3/g。 。当氢氧化钾与餐厨垃圾加氢焦比为4：1时，其储氢能力高达6.15 wt%(23 bar)和77 K。这凸显了餐厨垃圾上循环利用技术的有效性。
In an effort of developing hydrogen storage material, the goal of this study was to explore the potential of the abounding food waste biomass as a precursor for the development of porous carbon materials for remarkable hydrogen storage. Therefore, in this study, simulated food waste, a mixture of six commonly disposed food items (apple, bread, green bean, cabbage, cheese, and canned chicken), was hydrothermally carbonized at 220 °C followed by chemical activation at 800 °C using various activating agent (KOH) to food waste hydrochar ratio (i.e., 2:1, 3:1 and 4:1). The solid products, hereafter called superactivated hydrochars, were characterized by proximate and ultimate analyses as well as X-ray diffractometer (XRD) and through nitrogen adsorption isotherms at 77 K to analyze the changes in the material including its surface porosity parameters (surface area, pore volume, and pore size distribution) as the food waste underwent chemical and morphological modifications. The gravimetric (wt%) hydrogen storage capacity of the superactivated hydrochars were then conducted under 77 K and various pressure of 0–23 bar. Results showed that the surface area and total pore volume in the superactivated hydrochars were in the range of, as high as, 2070 to 2885 m2/g and 0.98 to 1.93 cm3/g, respectively. The remarkable hydrogen storage capacity was observed of as high as 6.15 wt% at 23 bar and 77 K for the superactivated hydrochar produced with a KOH to food waste hydrochar ratio of 4:1. This distinctly highlights the pertinent upcycling technique of food waste to be effective in developing efficient hydrogen storage material.