Abstract
A significant portion of the world’s population does not have access to safe drinking water. This problem is most acute in remote, resource-constrained rural settings in developing countries. Water filtration using activated carbon is one of the important steps in treating contaminated water. Lignocellulosic biomass is generally available in abundance in such locations, such as the African rain forests. Our work is focused on developing a simple method to synthesize activated biochar from locally available materials. The preparation of activated biochar with diammonium hydrogenphosphate (DAP) as the activating agent is explored under N2 flow and air. The study, carried out with cellulose as a model biomass, provides some insight into the interaction between DAP and biomass, as well as the char forming mechanism. Various characterization techniques such as N2 physisorption, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and Raman spectroscopy are utilized to compare the properties between biochar formed under nitrogen and partial oxidative conditions. At a temperature of 450 °C, the loading of DAP over cellulose is systematically varied, and its effect on activation is examined. The activated biochar samples are predominantly microporous in the range of concentrations studied. The interaction of DAP with cellulose is investigated and the nature of bonding of the heteroatoms to the carbonaceous matrix is elucidated. The results indicate that the quality of biochar prepared under partial oxidation condition is comparable to that of biochar prepared under nitrogen, leading to the possibility of an activated biochar production scheme on a small scale in resource-constrained settings.
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References
Collard F X, Blin J. A review on pyrolysis of biomass constituents: Mechanisms and composition of the products obtained from the conversion of cellulose, hemicelluloses and lignin. Renewable & Sustainable Energy Reviews, 2014, 38: 594–608
Antal M J, Grønli M. The art, science, and technology of charcoal production. Industrial & Engineering Chemistry Research, 2003, 42 (8): 1619–1640
Downie A E, Van Zwieten L, Smernik R J, Morris S, Munroe P R. Terra Preta Australis: Reassessing the carbon storage capacity of temperate soils. Agriculture, Ecosystems & Environment, 2011, 140 (1): 137–147
Huggins T M, Haeger A, Biffinger J C, Ren Z J. Granular biochar compared with activated carbon for wastewater treatment and resource recovery. Water Research, 2016, 94: 225–232
Rodríguez-Reinoso F, Molina-Sabio M, González M T. The use of steam and CO2 as activating agents in the preparation of activated carbons. Carbon, 1995, 33(1): 15–23
Caturla F, Molina-Sabio M, Rodríguez-Reinoso F. Preparation of activated carbon by chemical activation with ZnCl2. Carbon, 1991, 29(7): 999–1007
Molina-Sabio M, Almansa C, Rodríguez-Reinoso F. Phosphoric acid activated carbon discs for methane adsorption. Carbon, 2003, 41(11): 2113–2119
Yoon S H, Lim S, Song Y, Ota Y, Qiao W, Tanaka A, Mochida I. KOH activation of carbon nanofibers. Carbon, 2004, 42(8): 1723–1729
Jagtoyen M, Derbyshire F. Activated carbons from yellow poplar and white oak by H3PO4 activation. Carbon, 1998, 36(7): 1085–1097
Molina-Sabio M, Rodríguez-Reinoso F, Caturla F, Sellés M J. Porosity in granular carbons activated with phosphoric acid. Carbon, 1995, 33(8): 1105–1113
Fitzer E, Geigl K H, Hüttner W, Weiss R. Chemical interactions between the carbon fibre surface and epoxy resins. Carbon, 1980, 18 (6): 389–393
Puziy A, Poddubnaya O, Martínez-Alonso A, Suárez-García F, Tascón J M. Synthetic carbons activated with phosphoric acid: I. Surface chemistry and ion binding properties. Carbon, 2002, 40(9): 1493–1505
Hu B, Wang K, Wu L, Yu S H, Antonietti M, Titirici M M. Engineering carbon materials from the hydrothermal carbonization process of biomass. Advanced Materials, 2010, 22(7): 813–828
Hu B, Yu S H, Wang K, Liu L, Xu X W. Functional carbonaceous materials from hydrothermal carbonization of biomass: An effective chemical process. Dalton Transactions (Cambridge, England), 2008, 40(40): 5414–5423
Benaddi H, Bandosz T, Jagiello J, Schwarz J, Rouzaud J, Legras D, Béguin F. Surface functionality and porosity of activated carbons obtained from chemical activation of wood. Carbon, 2000, 38(5): 669–674
Mohan D, Pittman Charles U, Steele P H. Pyrolysis of wood/ biomass for bio-oil: A critical review. Energy & Fuels, 2006, 20(3): 848–889
Di Blasi C, Branca C, Galgano A. Effects of diammonium phosphate on the yields and composition of products from wood pyrolysis. Industrial & Engineering Chemistry Research, 2007, 46 (2): 430–438
Ilharco L M, Garcia A R, Lopes da Silva J, Vieira Ferreira L F. Infrared approach to the study of adsorption on cellulose: Influence of cellulose crystallinity on the adsorption of benzophenone. Langmuir, 1997, 13(15): 4126–4132
Bouchard J, Abatzoglou N, Chornet E, Overend R P. Characterization of depolymerized cellulosic residues. Wood Science and Technology, 1989, 23(4): 343–355
Branca C, Di B C. Oxidation characteristics of chars generated from wood impregnated with (NH4)2HPO4 and (NH4)2SO4. Thermochimica Acta, 2007, 456(2): 120–127
Sing K S W. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984). Pure and Applied Chemistry, 1985, 57 (4): 603–619
Molina-Sabio M, Rodríguez-Reinoso F. Role of chemical activation in the development of carbon porosity. Colloids and Surfaces. A, Physicochemical and Engineering Aspects, 2004, 241(1): 15–25
Oshida K, Kogiso K, Matsubayashi K, Takeuchi K, Kobayashi S, Endo M, Dresselhaus M S, Dresselhaus G. Analysis of pore structure of activated carbon fibers using high resolution transmission electron microscopy and image processing. Journal of Materials Research, 1995, 10(10): 2507–2517
Puziy A M, Poddubnaya O I, Socha R P, Gurgul J, Wisniewski M. XPS and NMR studies of phosphoric acid activated carbons. Carbon, 2008, 46(15): 2113–2123
Kannan A G, Choudhury N R, Dutta N K. Synthesis and characterization of methacrylate phospho-silicate hybrid for thin film applications. Polymer, 2007, 48(24): 7078–7086
Pels J R, Kapteijn F, Moulijn J A, Zhu Q, Thomas K M. Evolution of nitrogen functionalities in carbonaceous materials during pyrolysis. Carbon, 1995, 33(11): 1641–1653
Sethia G, Sayari A. Comprehensive study of ultra-microporous nitrogen-doped activated carbon for CO2 capture. Carbon, 2015, 93: 68–80
Pelavin M, Hendrickson D N, Hollander J M, Jolly W L. Phosphorus 2p electron binding energies. Correlation with extended Hueckel charges. Journal of Physical Chemistry, 1970, 74(5): 1116–1121
Marsh H, Rodríguez-Reinoso F. Activated carbon. Elsevier, 2006, 224–225
Zhou Y, Candelaria S L, Liu Q, Uchaker E, Cao G. Porous carbon with high capacitance and graphitization through controlled addition and removal of sulfur-containing compounds. Nano Energy, 2015, 12: 567–577
Jawhari T, Roid A, Casado J. Raman spectroscopic characterization of some commercially available carbon black materials. Carbon, 1995, 33(11): 1561–1565
Shimodaira N, Masui A. Raman spectroscopic investigations of activated carbon materials. Journal of Applied Physics, 2002, 92(2): 902–909
Acknowledgements
Support of this work by REFRESCH, funded through the University of Michigan’s Global Challenges for the Third Century program, is gratefully acknowledged. The authors thank Dr. Galen Fisher, Dr. Xiaoyin Chen and Dr. Andrew Tadd for their valuable insights during the research.
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Nahata, M., Seo, C.Y., Krishnakumar, P. et al. New approaches to water purification for resource-constrained settings: Production of activated biochar by chemical activation with diammonium hydrogenphosphate. Front. Chem. Sci. Eng. 12, 194–208 (2018). https://doi.org/10.1007/s11705-017-1647-x
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DOI: https://doi.org/10.1007/s11705-017-1647-x