Carbons prepared from coffee grounds by H3PO4 activation: characterization and adsorption of methylene blue and Nylosan Red N-2RBL

Journal of Hazardous Materials
A ReffasL Duclaux

Abstract

Activated carbons were prepared by the pyrolysis of coffee grounds impregnated by phosphoric acid at 450 degrees C for different impregnation ratios: 30, 60, 120 and 180 wt.%. Materials were characterized for their surface chemistry by elemental analysis, "Boehm titrations", point of zero charge measurements, Infrared spectroscopy, thermogravimetric analysis (TGA); as well as for their porous and morphological structure by Scanning Electron Microscopy (SEM) and nitrogen adsorption at 77K. The impregnation ratio was found to govern the porous structure of the prepared activated carbons. Low impregnation ratios (<120 wt.%) led to essentially microporous and acidic activated carbons whereas high impregnation ratios (>120 wt.%) yielded to essentially mesoporous carbons with specific surface areas as high as 925 m(2)g(-1), pore volume as large as 0.7 cm(3)g(-1), and neutral surface. The activated carbons prepared from coffee grounds were compared to a commercial activated carbon (S(BET) approximately 1400 m(2)g(-1)) for their adsorption isotherms of methylene blue and "Nylosan Red N-2RBL", a cationic and anionic (azo) dye respectively. The mesoporous structure of the material produced at 180 wt.% H(3)PO(4) ratio was found to be appr...Continue Reading

References

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Oct 24, 2006·Bioresource Technology· SuhasM M L Ribeiro Carrott
Dec 28, 2007·Bioresource Technology·Guillermo RodríguezJuan Fernández-Bolaños

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Citations

Feb 4, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Yunbo ZhaiGuangming Zeng
Jul 5, 2015·Journal of Environmental Sciences (China)·Xianlong ZhangYucheng Wu
Jan 21, 2015·Journal of Environmental Management·Ahed ZyoudHikmat S Hilal
Oct 4, 2016·Environmental Science and Pollution Research International·Sylvain MassonLaurent Duclaux
Nov 15, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Tarsila Maíra Nogueira de PaivaMaurício Alves da Motta Sobrinho
Jan 12, 2019·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Ali HgeigIvana Mihajlović
Feb 27, 2016·Chemistry & Biodiversity·Roberto A Canales-Flores, Francisco Prieto-García
Oct 1, 2019·Global Challenges·Gan Jet Hong MelvinMorinobu Endo
May 22, 2020·The Science of the Total Environment·P J ArauzoA Kruse
Jan 10, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jie RenShuiyu Sun
Aug 5, 2017·ACS Applied Materials & Interfaces·Huan XuMinna Hakkarainen

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