STUDY ON THE ADSORPTION PERFORMANCE OF GRAPHENE AND ITS COMPOSITES FOR THE ORGANIC MATTER AND HEAVY METALS IN WATER

摘要

In view of the pollution of organic matter and heavy metals in water, the pollution and hazard of heavy metal, the adsorption of heavy metals, and graphene oxide (GO) and its composites used in adsorption are briefly introduced. First, the improved Hummers method is used to prepare graphite oxide. And the graphite oxide dispersion is obtained by ultrasonic stripping treatment in water. Then, at room temperature, GO is modified by polyethyleneimine (PEI) and carboxymethyl cellulose (CMC) through solution blending. GO/PEI and GO/PEI/CMC composites of different mass ratios are prepared. Finally, optimal GO/PEI and GO/PEI/CMC composites are selected as adsorbents. And their adsorption properties for lead ions in water are explored. It is shown that heavy metal ions are more easily to be adsorbed on the surface of GO/PEI/CMC. And the adsorption performance of GO/PEI/CMC for heavy metal ions is better.