Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (1): 155.doi: 10.7503/cjcu20190418

• Physical Chemistry • Previous Articles     Next Articles

Adsorption of Cr 6+ on Polyethyleneimine-functionalized Straw Biochar from Aqueous Solution †

XU Jianling(),ZHANG Di,NIE Miaoqing,WANG Hanxi,LI Longwei   

  1. State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China
  • Received:2019-07-25 Online:2020-01-10 Published:2019-11-14
  • Contact: Jianling XU E-mail:xujl@foxmail.com
  • Supported by:
    ? Supported by the Natural Science Foundation of Jilin Province, China No(20180101092JC)

Abstract:

To study the properties of straw biochar composites and the adsorption characteristics of Cr 6+ from water, corn stalks were selected as raw material and corn stalk biochar was prepared by anoxic carbonization and loaded on the surface of biochar with polyethyleneimine(PEI). PEI-functionalized straw biochar was prepared, and its adsorption performance and the mechanism of Cr 6+adsorption were characterized. The results showed that the adsorption efficiency of PEI alkaline biochar(PBC) on Cr 6+ was significantly higher than that of PEI acidic biochar(HBC) and raw biochar(CBC) under the same conditions of adsorbent addition. The maximum adsorption capacity of Cr 6+ on PBC from aqueous solution was 386.3 mg/g, and the adsorption equilibrium time was 300 min. When the pH was approximately 2.0, the adsorption efficiency of Cr 6+ reached 95.94%. Therefore, PBC can be used as an adsorbent for the efficient removal of Cr 6+ in water.

Key words: Corn stalk, Biochar, Polyethyleneimine, Cr 6+, Adsorption

CLC Number: 

TrendMD: