The utilization of water hyacinth (Eichhornia crassipes) harvested from the phytoremediation process as activated carbon in Cr(VI) adsorption

Abstract Water hyacinth ( Eichhornia crassipes ) is one aquatic plant widely used in phytoremediation. hyacinths can absorb organic, inorganic, and heavy metal pollutants. Cr(VI) of the metals found industrial waste. Adsorption techniques to remove content. Activated carbon good adsorbents because it has a high adsorption ability. The ability activated adsorb influenced by surface area, solution pH, adsorbent dose. This study aims utilize water hyacinth-activated determine optimum conditions based on contact time, weight, variations concentration solutions. Conducted research experimentally with stages covering: (1) manufacture from hyacinth, (2) carbonization process at temperatures 300°C 600°C for 2.5 hours, (3) chemical activation ZnCl 2 10%, (4) quality testing SNI No. 06-3730-1995 moisture content, ash iodine absorption, methylene blue (5) characteristics functional groups FTIR, (6) preliminary tests, (7) optimization solutions UV-Vis spectrophotometer. results showed that characteristic test had met requirements absorption. A leaves highest capacity. were pH 1, weight 1 gram, time 24 200 mg/L.