Polydopamine-modified MXene and oxidized sodium alginate-modified collagen (MPAC) composite aerogel was prepared by a freeze-drying method and used as an adsorbent to treat Cr(Ⅵ) in water.The polydopamine-modified MXene (MXene@PDA) and MPAC composite aerogel were characterized by TEM and SEM.The effects of oxidized sodium alginate (OSA) dosage,collagen concentration,MXene@PDA dosage,solution pH,adsorption temperature,and adsorption time on the adsorption performance for Cr(Ⅵ) were studied.The results showed that MXene was successfully coated by PDA,and MPAC composite aerogel with a three-dimensional porous network structure was prepared.When the OSA dosage was 10%,the collagen concentration was 5mg/mL,and the MXene@PDA dosage was 60%,the adsorption performance for Cr(Ⅵ) was the best.The adsorption process reached equilibrium at 60 min,and the adsorption capacity decreased with the increase of pH and temperature.
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