4.7 Article

Corn stalk-based activated carbon synthesized by a novel activation method for high-performance adsorption of hexavalent chromium in aqueous solutions

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 578, Issue -, Pages 650-659

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.06.031

Keywords

Activated carbon; Micro-meso pores; Corn stalks; Adsorption; Hexavalent chromium; Activation method

Funding

  1. National Natural Science Foundation of China [201905081]
  2. Natural Science Fund Project in Heilongjiang Province of China [LH2019B015]
  3. Fundamental Research Project of Higher Educations in Heilongjiang Province of China [KJCX201813]

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A simple activation method involving treatment with KOH solution was used to synthesize activated carbon (ACs) with micro-meso pores from the agricultural waste of corn stalks. The activation reagent, KOH solution, was easily separated for recycling by centrifugation from the pre-treated corn stalks, and the pollution in the carbonization process was greatly reduced. The morphology and structure of the ACs were characterized by SEM, TEM, N-2 adsorption, XRD, FT-IR and Raman analysis. The prepared carbon was applied as an adsorbent for the removal of Cr(VI) in a batch adsorption process. The effect of the concentration of KOH solution on the structure, morphology and Cr(VI) adsorption performance of the synthesized ACs was investigated. The characterization results revealed that some functional groups in the corn stalks were removed by pretreatment with KOH solution and micro-meso porous structures were generated. The ACs showed high adsorption performance for Cr(VI), and the maximum adsorption ability of the ACs prepared by activation with 4% KOH solution reached 89.5 mg g(-1) at an adsorbent dosage of 2.5 g L-1 and pH value of 4.5. (C) 2020 Elsevier Inc. All rights reserved.

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