▎ 摘　　要

NOVELTY - Preparation of macroporous composite ball adsorbent includes dispersing oxidized graphite in deionized water, magnetically stirring, and dissociating to obtain oxidized graphene dispersion liquid; adding 4-aminothiophenol into hydrochloric acid solution, gradually heating, slowly dropping sodium nitrite solution, ice water bath stirring, adding oxidized graphene dispersion liquid, stirring, washing, and vacuum-drying solid to obtain mercapto-oxidized graphene; and adding reactor containing deionized water with e.g. polyvinyl alcohol, stirring, adding mercapto-oxidized graphene, and stirring. USE - Method for preparation of macroporous composite ball adsorbent used for heavy metal wastewater treatment (all claimed). ADVANTAGE - The adsorbent contains mercapto group which reduces the water solubility, easily separates solid and liquid, and enhances adsorption capacity, and has good mass transfer properties, and improved mechanical strength and practical value. DETAILED DESCRIPTION - Preparation of macroporous composite ball adsorbent comprises: (A) dispersing oxidized graphite in deionized water at room temperature, magnetically stirring to obtain oxidized graphene colloid suspension, and dissociating for 2-6 hours to obtain 0.5-10.0 mg/mL oxidized graphene dispersion liquid; (B) adding 4-aminothiophenol into hydrochloric acid solution while stirring, gradually heating to 35-55 degrees C to obtain 4-aminothiophenol solution; dissolving sodium nitrite in deionized water to obtain sodium nitrite solution; and slowly dropping sodium nitrite solution into 4-aminothiophenol solution while stirring under ice water bath conditions, adding oxidized graphene dispersion liquid, stirring for 8-24 hours, washing with acetone, anhydrous ethanol and deionized water multiple times, and vacuum-drying solid at 50 degrees C to obtain mercapto-oxidized graphene; and (C) adding reactor containing deionized water with polyvinyl alcohol, sodium alginate and calcium carbonate at ratio of 10:1-5:10-20, stirring at 90-95 degrees C until solid is completely dissolved, adding mercapto-oxidized graphene, stirring at 75-95 degrees C for 4-12 hours to obtain mercapto-oxidized graphene/polyvinyl alcohol gel, injecting into calcium chloride-saturated boric acid solution at ratio of 5 g:100 mL instantly forming black ball, hardening for 12-48 hours, transferring into deionized water, dropping hydrochloric acid solution, slowly stirring, and repeatedly washing with large amount of distilled water until neutralized. The 4-aminothiophenol, sodium nitrite and hydrochloric acid have molar ratio of 1:1:1.0-1.5. The 4-aminothiophenol and oxidized graphene have mass ratio of 1-5:1. The mercapto-oxidized graphene and polyvinyl alcohol have mass ratio of 1:4-30.