Department of Mechanical Engineering, National Taiwan University of Science and Technology, No 43, Sec 4, Keelung Rd, Taipei, 106, Taiwan.
High Speed 3D Printing Research Center, National Taiwan University of Science and Technology, No 43, Sec 4, Keelung Rd, Taipei, 106, Taiwan.
Sci Rep. 2020 Jan 10;10(1):124. doi: 10.1038/s41598-019-56668-5.
Activated carbon is the most known material used to adsorb ozone. Activating carbonaceous materials by ozonation is commonly used to produce activated carbon, however, requiring sophisticated skills and professional equipment. This paper presents a reversed idea: to adsorb ozone using an unactivated carbonaceous material, coffee. Three powder adsorbents are presented: fresh coffee (unactivated), spent coffee grounds (unactivated), and activated carbon (commercially available). The test is conducted by measuring and comparing the ozone concentration in an ozone-supplied chamber with or without the ozone adsorbent. The results show that, at the specific conditions, the peak ozone concentration is lowered by 38% to 56% when the chamber has the activated carbon. At the same conditions, the peak ozone concentration is lowered by 25% to 43% when the chamber has the coffee powders (either fresh or spent). The elemental analysis demonstrates that the oxygen content after the ozone adsorption increases by 20%, 14.4%, and 34.5% for the fresh coffee, the spent coffee grounds, and the activated carbon, respectively. The characteristic analysis (the Fourier-transform infrared spectroscopy, the thermogravimetric, and the Brunauer-Emmett-Teller) suggests that the unactivated coffee is not porous, however, contains various organic compounds that could react with and consume ozone.
活性炭是最常用于吸附臭氧的材料。通过臭氧氧化来活化碳质材料通常用于生产活性炭，但需要复杂的技能和专业设备。本文提出了一个相反的想法：使用未活化的碳质材料——咖啡来吸附臭氧。本文提出了三种粉末吸附剂：新鲜咖啡（未活化）、用过的咖啡渣（未活化）和商业上可用的活性炭。通过测量和比较臭氧供应室内有或没有臭氧吸附剂时的臭氧浓度来进行测试。结果表明，在特定条件下，当室内有活性炭时，臭氧浓度峰值降低了 38%至 56%。在相同条件下，当室内有咖啡粉（新鲜或用过的）时，臭氧浓度峰值降低了 25%至 43%。元素分析表明，新鲜咖啡、用过的咖啡渣和活性炭的臭氧吸附后的氧含量分别增加了 20%、14.4%和 34.5%。特征分析（傅里叶变换红外光谱、热重分析和 Brunauer-Emmett-Teller）表明，未活化的咖啡没有孔，但含有各种可能与臭氧反应并消耗臭氧的有机化合物。
