This invention discloses a modified
grapefruit peel-based carbon
aerogel, its preparation method, and its applications, belonging to the field of adsorbent preparation technology. The preparation method involves placing the
grapefruit peel-based carbon
aerogel in a
potassium hydroxide solution and stirring at 75–85°C for 2.5–3.5 hours. After stirring, the mixture is filtered and dried, then calcined at 850–950°C for 1–1.5 hours in a
nitrogen atmosphere. This invention solves the problems of low adsorption capacity and poor selectivity in current adsorbent materials. The modified
grapefruit peel-based carbon
aerogel electrode exhibits preferential selectivity for nitrates and phosphates. The invention utilizes
capacitive deionization technology, resulting in low
energy consumption and
cost savings. The electroadsorption
system electrode uses grapefruit peel as a
raw material, which is widely available, convenient, and inexpensive. The resulting
biomass-based carbon aerogel has the advantages of being renewable, biodegradable, and rich in carbon sources. It also enables the recycling of waste grapefruit peels, making it an
environmentally friendly renewable material.