Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, India.
Department of Mechanical Engineering, National Institute of Technology Goa, Farmagudi, Ponda, Goa, 403401, India.
J Environ Manage. 2023 Sep 15;342:118350. doi: 10.1016/j.jenvman.2023.118350. Epub 2023 Jun 9.
In this study, activated hydrochar was prepared from orange peel (OP) waste using KOH for the first time for potential environmental applications. The influence of hydrothermal carbonization temperature (180 °C, 200 °C, and 220 °C) on the CO adsorption capacity of OP-derived activated hydrochar (OP-180, OP-200, and OP-220) was investigated. Scanning electron microscope (SEM) images revealed that the activated OP hydrochar has high microporosity, a desired attribute for effective adsorption. The yield and the oxygen content of the hydrochar decreased with the increasing process temperature whereas the carbon content showed an increase. Fourier-transform infrared spectroscopy showed the presence of various functional groups including ketone, aldehydes, esters, and carboxyl in the hydrochar. CO adsorption isotherm was determined for all hydrochar samples. At 25 °C and 1 bar, OP-220 showed the highest CO uptake at 3.045 mmol/g. The use of OP waste for CO adsorption applications contributes to carbon neutrality and a circular economy.
在这项研究中，首次使用 KOH 从橙皮（OP）废物中制备了活化水炭，用于潜在的环境应用。考察了水热碳化温度（180°C、200°C 和 220°C）对 OP 衍生活化水炭（OP-180、OP-200 和 OP-220）CO 吸附能力的影响。扫描电子显微镜（SEM）图像表明，活化 OP 水炭具有高微孔率，这是有效吸附的理想属性。水炭的产率和氧含量随工艺温度的升高而降低，而碳含量则增加。傅里叶变换红外光谱显示水炭中存在各种官能团，包括酮、醛、酯和羧基。测定了所有水炭样品的 CO 吸附等温线。在 25°C 和 1 巴下，OP-220 在 3.045 mmol/g 时表现出最高的 CO 吸收量。OP 废物用于 CO 吸附应用有助于实现碳中和和循环经济。
