Synthesis Of Graphene Oxide Loaded With Nanoscale Zero Valent Iron For Ionic Dyes Removal From Aqueous Solution

With the rapid development of dyestuff industry, the environment pollution from dye wastewater becomes more and more serious. It can bring huge damage to water quality, water organisms and human health when dye wastewater is discharged into water. Due to its high efficiency, great adaptablity and easy operation, adsorption method was widely concerned in the practical application. Graphene, as a novel carbon nanomaterial, owend high specific surface areas, super electrical performances and exceptional mechanical strength, showing great potential in the adsorption field. In this paper, graphene oxide was prepared using common Hummer's method and graphene oxide loaded with nanoscale zero valent iron(Fe0/GO) was synthesized by modified liquid phase reduction method of zero valent iron nanoparticles on graphene oxide nanosheets. Fe0/GO was used as adsorbents to remove cationic dye methylene blue and anionic dyes methyl orange from aqueous solution. The effects of initial p H?initial mass concentration?reaction time and temperature were investigated. And the results provided theoretical basis for the environmental application of graphene. The main contents of this paper were:(1) Graphene was prepared from graphite via Hummer method and modified liquid phase reduction method. The SEM image showed that n anoscale iron with spherical or short-chain structure loaded on graphene oxide increasing the reacive sites. The XRD atlas showed that nanoscale zero valent iron successfully loaded on graphene oxide. The p HPZC value of Fe0/GO and the specific surface was 3 and 158.32 m2/g by Zeta potential test and nitrogen adsorption- desorption experiment.(2) Influencing factors of Fe0/GO adsorpting methylene blue process were explored. Optimum adsorption p H was 6 and adsorption optimum reaction temperature was 25?. The adsorption isotherms fitted well with the Langmuir and Frenudlich isotherms models. The maximal adsorption quantity was 201.2 mg/g. The adsorption processes coincided with the pseudo-second-order model and the adsorption equilibrium was reached within 5 h.(3) Influencing factors of Fe0/GO adsorpting methyl orange process were explored. Optimum adsorption p H was 2 and adsorption optimum reaction temperature was 40?. The adsorption isotherms fitted well with the Langmuir and Frenudlich isotherms models. The maximal adsorption quantity was 53.289 mg/g. The adsorption processes coincided with the pseudo-second-order model and the adsorption equilibrium was reached within 1 h.