Extraction of Silica from Three Varieties (Dista, Makalioka, Tsemaka) of Rice Bales of Madagascar

Andrianainarivelo Mahandrimanana; Ranarison Josoa; Randriantsoa Domohina Mahefa; Rabemiarisoa Maitsomirovana Niraisina; Rajoelisoa Andriamalala

doi:10.25159/3005-2602/21941

Authors

Andrianainarivelo Mahandrimanana University of Antananarivo
Ranarison Josoa University of Antananarivo https://orcid.org/0009-0001-0247-1469
Randriantsoa Domohina Mahefa University of Antananarivo https://orcid.org/0009-0003-9858-3063
Rabemiarisoa Maitsomirovana Niraisina University of Antananarivo https://orcid.org/0009-0008-8403-0325
Rajoelisoa Andriamalala University of Antananarivo https://orcid.org/0000-0002-0639-021X

DOI:

https://doi.org/10.25159/3005-2602/21941

Keywords:

rice, bio-based materials, sol–gel process, nanosilica

Abstract

Madagascar is ranked among the largest consumers of rice in the world. The annual per capita consumption of rice in rural Malagasy is 138 kg, and in urban areas 118 kg. Urban households eat 85% of their meals with rice. Rice cultivation is practiced throughout the island. The overall annual rice production is estimated at 4 680 630 t in 2020. For each tonne of paddy milled, 200 kg of rice bales (outer husk of rice) are obtained from husking, which have an energy content equivalent to 60 L of fuel oil. The rice husk contains a non-negligible amount of silica varying between 26% and 88% depending on the extraction methods. Two methods of silica extraction are used: the thermal method and the soft method. The silica content extracted from the rice husk is different in both methods. The extraction was carried out in three varieties of Malagasy rice: Makalioka, Tsemaka and Dista. The percentage of silica obtained varies from 82% to 85%. It was compared to that synthesised by the sol–gel process using the X-ray fluorescence technique and spectrophotometer infrared analysis. This study is of economic and environmental interest: recovery of agricultural waste, reduction of pollution and the circular economy in Madagascar. The extraction of nanometric silicon dioxide, commonly known as silica (SiO₂), from rice bales allows for the transformation of abundant agricultural waste into a material of high added value.

References

[1] Ministry of Economy, Finance and Budget, “Le riz à Madagascar [Rice in Madagascar],” Econ. Inf. Rev., vol. 17, 2004.

[2] Ministry of Industry, Trade and Handicrafts (MICA), “Rice trade in Madagascar,” 23 Nov. 2020.

[3] B. Waswa-Sabuni, P. M. Syagga, S. O. Dulo and G. N. Kamau, “Rice Husk Ash Cement – An Alternative Pozzalana Cement for Kenyan Building Industrie,” J. Civ. Eng., vol. 8, no. 1, pp. 13–26, Mar. 2003, doi: 10.4314/jce.v8i1.18992. DOI: https://doi.org/10.4314/jce.v8i1.18992

[4] S. Azat, Z. Sartova, K. Bekseitova and K. Askaruly, “Extraction of high-purity silica from rice husk via hydrochloric acid leaching treatment,” Turk. J. Chem., vol. 43, no. 5, pp. 1258–1269, 2019, doi: 10.3906/kim-1903-53. DOI: https://doi.org/10.3906/kim-1903-53

[5] N. N. Nguyen, L. X. Thanh, L. T. Vinh and B. T. V. Anh, “High-purity amorphous silica from rice husk: Preparation and characterization,” Vietnam J. Chem., vol. 56, no. 6), pp. 730–736, Dec. 2018, doi: 10.1002/vjch.201800079. DOI: https://doi.org/10.1002/vjch.201800079

[6] N. Soltani, A. Bahrami, M. I. Pech-Canul and L. A. González, “Review on the physicochemical treatments of rice husk for production of advanced materials,” Chem. Eng. J., vol. 264, pp. 899–935, Mar. 2015, https://doi.org/10.1016/j.cej.2014.11.056. DOI: https://doi.org/10.1016/j.cej.2014.11.056

[7] T. van Nguyen, “Rice husk ash as a mineral admixture for ultra high performance concrete,” PhD thesis, Mater. Environ., Delft University of Technology, 2011, https://research.tudelft.nl/en/publications/rice-husk-ash-as-a-mineral-admixture-for-ultra-high-performance-c.

[8] V. P. Della, I. Kühn and D. Hotza, “Rice husk ash as an alternative source for active silica production,” Mater. Lett., vol. 57, no. 4, pp. 818–821, Dec. 2002, doi: 10.1016/S0167-577X(02)00879-0. DOI: https://doi.org/10.1016/S0167-577X(02)00879-0

[9] N. Yalçin and V. Sevinç, “Studies on silica obtained from rice husk,” Ceram. Int., vol. 27, no. 2, pp. 219–224, 2001, doi: 10.1016/S0272-8842(00)00068-7. DOI: https://doi.org/10.1016/S0272-8842(00)00068-7

[10] R. Pode, “Potential applications of rice husk ash waste from rice husk biomass power plant,” Renew. Sustain. Energy Rev., vol. 53, pp. 1468–1485, Jan. 2016, doi: 10.1016/j.rser.2015.09.051. DOI: https://doi.org/10.1016/j.rser.2015.09.051

[11] M. Amin, N. Juita and Asnawi, “Application of nano silica fertilizer in agricultural sustainability (a review),” Earth Environ. Sci., p. 1230, doi: 10.1088/1755-1315/1230/1/012063. DOI: https://doi.org/10.1088/1755-1315/1230/1/012063

[12] R. Bekkam, C. Thiyagarajan and M. Ganesan, “Nanosilica: Synthesis and its impact on Plant Nutrition and Stress Management,” J. Soil Sci. Plant Nutr., vol. 25, pp. 5341–5365, May 2025, doi: 10.1007/s42729-025-02468-y. DOI: https://doi.org/10.1007/s42729-025-02468-y

[13] S. A. Ajeel, K. A. Sukkar and N. K. Zedin, “Extraction of high purity amorphous silica from rice husk by chemical process,” IOP Conf. Ser.: Mater. Sci. Eng., vol. 881, p. 012096, 2020, doi: 10.1088/1757-899X/881/1/012096. DOI: https://doi.org/10.1088/1757-899X/881/1/012096

[14] M. Andrianainarivelo, R. Corriu, D. Leclerc, P. H. Mutin and A. Vioux, “Mixed oxides SiO2-ZrO2 and SiO2-TiO2 by a non-hydrolytic sol–gel route,” J. Mater. Chem., vol. 6, no. 10, pp. 1665–1671, 1996, doi: 10.1039/JM9960601665. DOI: https://doi.org/10.1039/JM9960601665

[15] A. Mahandrimanana, “Homogénéité d’oxydes mistes SiO2-ZrO2, SiO2-TiO2, TiO2-ZrO2, Al2O3-TiO2 Al2O3-SiO2 préparés par sol–gel non-hydrolitique [Homogeneity of mixed oxides SiO2-ZrO2, SiO2-TiO2, TiO2-ZrO2, Al2O3-TiO2 Al2O3-SiO2 prepared by non-hydrolytic sol–gel],” PhD thesis, University of Montpellier, 1996, https://theses.fr/1996MON20077.

[16] J. Osswald and K. T. Fehr, “FTIR spectroscopic study on liquid silica solutions and nanoscale particle size determination,” J. Mater. Sci.,. vol. 41, pp. 1335–1339, Mar. 2006, doi: 10.1007/s10853-006-7327-8. DOI: https://doi.org/10.1007/s10853-006-7327-8