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Volume 38 Issue 6
Aug.  2020
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ZHAO Jie, HE Yu-hong, ZHANG Xiao-ming, LI Qi, YANG Wei-chun. EFFECT ON Cr(Ⅵ) ADSORPTION PERFORMANCE OF ACID-BASE MODIFIED BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 28-34. doi: 10.13205/j.hjgc.202006005
Citation: ZHAO Jie, HE Yu-hong, ZHANG Xiao-ming, LI Qi, YANG Wei-chun. EFFECT ON Cr(Ⅵ) ADSORPTION PERFORMANCE OF ACID-BASE MODIFIED BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 28-34. doi: 10.13205/j.hjgc.202006005

EFFECT ON Cr(Ⅵ) ADSORPTION PERFORMANCE OF ACID-BASE MODIFIED BIOCHAR

doi: 10.13205/j.hjgc.202006005
  • Received Date: 2020-03-24
  • Biochar attracted more and more attention as a processing adsorbent of heavy metals in the field of environmental protection, due to its wide source of raw materials, abundant active functional groups in surface, and stable physical and chemical properties. In this work, pine sawdust was used to synthesize biochar at a carbonization temperature of 400 ℃(AB400) by using HNO3, H3PO4, NH3 · H2O, Ca (OH)2 as the modification agent of the biochar. SEM, FTIR, Boehm titration method and Zeta potential determination were adopted to characteriza Biochar AB400. And Cr(Ⅵ) adsorption experiment was conducted. After modification, the structure of biochar appeared semi-penetrating to penetrating round collapse with micropores. Under the conditions of acid modification, the content of intermediate acid functional groups of AB400HNO3 and AB400H3PO4 increased, and the pH values of biochar decreased, corresponding to the increase in pHpzc value. As for the Cr(Ⅵ) adsorption, the overall adsorption performance of the acid modified biochar was better than that of alkaline modified biochar, and AB400H3PO4 achieved the best adsorption performance with an adsorption capacity increased from 58.48 mg/g to 101.82 mg/g. This was probably because the surface of alkaline modified biochar was negatively charged and repulsive to the oxygen-containing anions of Cr(Ⅵ). AB400HNO3 had smaller volume of micropores and a smaller number of round collapses than AB400H3PO4. Although the surface of AB400HNO3 was also positively charged, its adsorption performance was not as good as that of AB400H3PO4.
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