Manufacture of Mesoporous Silicon from Living Plants and Agricultural Waste: An Environmentally Friendly and Scalable Process
- 573 Downloads
We demonstrate a process for realising mesoporous silicon from a range of land-based plants such as common grasses, bamboos, sugarcane and rice. Such plants act as “natural factories”, converting and concentrating vast quantities of soluble silicon in soil into nanostructured forms of silica in their roots, stems, branches or leaves. This porous biogenic silica is chemically extracted and then thermally reduced to porous silicon using magnesium vapor. Importantly, for larger batch size, an inexpensive thermal moderator such as salt, is added for control of the reaction exotherm and minimization of sintering. Mesoporous silicon of >350 m2/g with 8 nm wide pores has been obtained from a bamboo extract, for example. The same process is applicable to a wide range of “silicon accumulator plants”. The purity of this “naturally derived” porous silicon is likely to be raised to a level acceptable for a wide range of high volume applications outside of electronics and solar cell technology.
KeywordsSilicon Mesoporous Biodegradable Sustainable Plants Agricultural waste products
Unable to display preview. Download preview PDF.
- 1.Jugdaohsingh R (2007) J Nutr Health Aging 11(2):99–110Google Scholar
- 3.Canham LT (2006) PCT Patent WO 2006/111761. PCT Patent WO 2010/058218Google Scholar
- 4.Sailor MJ (2012) Porous silicon in practice. Wiley VCHGoogle Scholar
- 7.Datnoff LE, Synder CH, Korndorfer GH (eds) (2001) Silicon in agriculture. ElsevierGoogle Scholar
- 11.Bao Z, Weatherspoon MR, Shian S, Cai Y, Graham PD, Allan SM, Ahmad G, Dickerson MB, Church BC, Kang Z, Abernathy HW, Summers CJ, Liu M, Sandhage H (2007) Nature 446. doi: 10.1038/nature05570
- 14.Larbi KK (2010) M. Appl. Sci. Thesis, Univ. Toronto, CanadaGoogle Scholar
- 16.Sun Y, Lin L, Deng H, Li J, He B, Sun R, Ouyang P (2008) BioResources 3(2):297–315Google Scholar
- 17.Park S, Baker JO, Himmel ME, Parilla PA, Johnson DK (2010) Biotech Fuels 3:10Google Scholar
- 18.Canham LT (1995) Adv Mater 7:1033–1037. PCT Patent WO 97/06101, 1999Google Scholar
- 21.Tasciotti E, Godin B, Martinez JO, Chiappini C, Bhavane R, Liu XW, Ferrari M (2011) Mol Imaging 10(1):56–58Google Scholar
- 31.Matichenkov VV, Calvert DV (2002) J Am Soc Sugarcane Techn 22:21–30Google Scholar