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Silane coupling agent assisting dopamine-functionalized biomass porous carbons for enhanced adsorption of organic acids: effects of acid–alkali activation on microstructure

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2021, 31(1), pp.29-37
  • DOI : 10.1007/s42823-020-00146-w
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : December 7, 2019
  • Accepted : April 20, 2020
  • Published : February 1, 2021

Qi Wang 1 Yaying Lv 2 Tao Zhu. 2

1중국 천진시 빈수이서로 391호 화학화학공학부 유기태양전지 및 광화학변환 연구실 천진시
2Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and

Accredited

ABSTRACT

Biomass porous carbons derived from Laminaria japonica were prepared by KOH and H3PO4 activation methods, respectively. The results indicated that the chemical activation had an apparent effect on the molecular framework and space of materials. To enhance the selective adsorption for organic acids, biomass carbons were modified by dopamine combined with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. The SEM and BET results illustrated the effect of the chemical activation approach on the morphology and porous texture. The biomass porous carbon using KOH activation method had the highest surface area (up to 1558 m2/g). Compared with unmodified materials, the modified materials showed higher adsorption capacity for organic acids (27.90 μg/mL for chlorogenic acid and 25.47 μg/mL for caffeic acid). It was suggested that modification of porous carbons might be a viable pathway to increase the specific adsorption affinity and efficiency for organic acids in dried jujube samples.

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