NDLI: Development of carbon adsorbents with high surface acidic and basic group contents from phosphoric acid activation of xylitol

Content Provider	Royal Society of Chemistry (RSC)
Author	Cheng, Cheng Zhang, Jian Jiang, Li Kang, Yan Guo, Zizhang Zhang, Chenglu Liu, Hai
Copyright Year	2015
Abstract	The present paper evaluated the feasibility of synthetizing activated carbons from xylitol with phosphoric acid activation at mild temperatures. Activation temperature (250–450 °C) and phosphoric acid to xylitol impregnation ratio (0.2–3 wt%) were varied during the synthesis of xylitol-based activated carbon, and the effects of these parameters on the textural and chemical properties of the final activated carbons were investigated by XRD, Raman, N2 adsorption and desorption, SEM, XPS and Boehm's titration. The results of yield, XRD and Raman indicated that phosphoric acid activation enhanced the yields of activated carbons, and facilitated the formation of completely carbonized materials at low temperatures (around 250 °C) by comparing with charcoals derived from pyrolysis of xylitol. The porous structures of the activated carbons were developed after activation, and for each activation temperature, the carbons reached the maximum surface area at an impregnation ratio of 1.5. Due to the strong oxidizing radicals decomposed from phosphates, the produced carbons contain relatively high concentrations of acidic and basic surface groups. The total surface groups peaked at 6.08 mmol g−1 for activated carbon obtained at an activation temperature of 350 °C and impregnation ratio of 1.5. The Ni(II) adsorption capacity of the activated carbons was 4 to 7 folds that of the charcoals.
Starting Page	81220
Ending Page	81228
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c5ra14579a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Xylitol Pyrolysis Adsorption Activated carbon Raman Titration Boehm
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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