▎ 摘　　要

NOVELTY - Preparing graphene oxide/chitosan composite material adsorbent comprises adding e.g. graphite, potassium permanganate, deionized water and hydrogen peroxide to a three-necked flask, stirring, washing with deionized water, centrifuging to neutral, ultrasonically stripping to obtain a graphite oxide dispersion, mixing the graphene oxide dispersion and the chitosan solution, stirring thoroughly, adding glutaraldehyde for cross-linking, washing with deionized water, freeze-drying to obtain graphene oxide/chitosan composite adsorbent. The preparation of original solution of chromium (VI) using potassium dichromate comprises adding deionized water to dilute to the needed concentration, adjusting the initial pH, incubating, adding adsorbent to the experiment solution for adsorption experiment of chromium (VI), filtering the adsorption liquid, taking the precipitate and using ultraviolet spectrophotometer to analyze the concentration of chromium (VI) in the aqueous solution to obtain product. USE - The method is useful for preparing graphene oxide/chitosan composite material adsorbent. ADVANTAGE - The graphene oxide/chitosan composite material adsorbent obviously enhances the adsorption performance of chromium (VI); realizes the removal of heavy metal ion chromium (VI) in the sewage; has excellent adsorption effect and reduces the adsorbent cost. The method enhances the cross-linking of graphene oxide and chitosan through the reaction of aldehyde groups with amino groups in chitosan and avoids the composite material adsorbent from being difficult to separate from the solution after the adsorption. DETAILED DESCRIPTION - Preparing graphene oxide/chitosan composite material adsorbent comprises adding graphite, concentrated sulfuric acid, potassium permanganate, deionized water and hydrogen peroxide to a three-necked flask, stirring, washing with deionized water, centrifuging to neutral, ultrasonically stripping to obtain a graphite oxide dispersion, mixing the graphene oxide dispersion and the chitosan solution, stirring thoroughly, adding glutaraldehyde for cross-linking, washing with deionized water, freeze-drying to obtain graphene oxide/chitosan composite adsorbent, inspecting the adsorption performance of the graphene oxide/chitosan composite material adsorbent to chromium (VI), studying the ratio of different graphene oxide and chitosan, pH value, time of contact, initial concentration, dosage of adsorbent and the influence of temperature on the graphene oxide/chitosan composite material adsorbent adsorption performance. The preparation of original solution of chromium (VI) using potassium dichromate comprises adding deionized water to dilute to the needed concentration, adjusting the initial pH of each sample solution, incubating, adding adsorbent to the experiment solution of the known concentration for adsorption experiment of chromium (VI), filtering the adsorption liquid by filter, taking the precipitate after absorbing and balancing and using ultraviolet spectrophotometer to analyze the concentration of chromium (VI) in the aqueous solution to obtain adsorption capacity (qe) of the graphene oxide/chitosan composite material adsorbent to chromium (VI) according to equation (1), where C0 is the initial concentration of chromium (VI) (mg/L), Ce is the balance concentration (mg/l) of chromium (VI), V (L) is the volume of the adsorption solution and m (g) is the mass of the adsorbent.