▎ 摘　　要

NOVELTY - Removing iron ions from water involves preparing sulfur-doped graphene airgel by dispersing oxidized graphene in deionized water for 10-30 minutes, adding dithiothreitol, and heating at 95 degrees C for 2 hours. The product is immersed in distilled water for 2 to 3 days and freeze-dried to obtain sulfur-doped graphene airgel material. The sulfur-doped graphene airgel paper electrode is prepared by mixing sulfur doped graphene airgel with a pre-formulated polyvinyl alcohol solution to form a paste-like dispersion. USE - Method for removing iron ions from water (claimed). ADVANTAGE - The method enables to remove iron ions from water effectively with high efficiency in simple and cost-effective manner. DETAILED DESCRIPTION - Removing iron ions from water involves preparing sulfur-doped graphene airgel by dispersing oxidized graphene in deionized water for 10-30 minutes, adding dithiothreitol, and heating at 95 degrees C for 2 hours. The product is immersed in distilled water for 2 to 3 days and freeze-dried to obtain sulfur-doped graphene airgel material. The sulfur-doped graphene airgel paper electrode is prepared by mixing sulfur doped graphene airgel with a pre-formulated polyvinyl alcohol solution to form a paste-like dispersion. The 0.1-0.4ml dispersion is uniformly coated on the hard paper which is freeze-dried to obtain a sulfur-doped graphene airgel paper electrode. The iron ion solution is prepared and placed in an electric adsorption vessel for performing iron-ion adsorption on the sulfur-doped graphene airgel paper electrode. The three-electrode system is used to study the iron-ion adsorption. The paper electrode is used as the working electrode, platinum electrode as counter electrode and the calomel electrode as reference electrode. The conductivity meter is used to monitor the change of solution conductivity. The electrode desorption regeneration is performed.