Preparation method for oxalic-acid-modified pummelo pericarp biological adsorbent

A related preparation method for an oxalic-acid-modified pummelo pericarp biological adsorbent comprises the following steps: step (1) cleaning crude pummelo pericarp (PP), baking, crushing and sieving; step (2), getting the crude pummelo pericarp (PP) prepared in the step (1), adding isopropanol, immersing with stirring, and performing pumping filtration; step (3) baking the pummelo pericarp subjected to pumping filtration in the step (2), so as to obtain a pummelo pericarp adsorbent (PP1); step (4), immersing the pummelo pericarp adsorbent (PP1) obtained in the step (3) with NaOH, neutralizing and performing pumping filtration, and baking to obtain a pummelo pericarp adsorbent (PP2); and step (5) adding 1% of oxalic acid into the pummelo pericarp adsorbent (PP2) obtained in the step (4), immersing with stirring, performing pumping filtration, and baking, so as to obtain the modified pummelo pericarp adsorbent (MPP). New application of pummelo pericarp is discovered by performing adsorption research on a heavy metal cadmium by using oxalic-acid-modified pummelo pericarp.