https://orcid.org/0000-0002-9753-3684
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ABSTRACT
Effects of alkaline surface modification and carbonization on biochemical properties of selected rice and coffee husk varieties in Uganda were studied. Alkali pre-treatment was done by washing the husks in NaOH at a 15:1 liquor ratio. Pre-treatment is used in biomass conversion to overcome chemical and structural difficulties. Carbonization resulted in production of bio-char. Results showed increased cellulose contents for both the husks and their bio-chars after pre-treatment with NaOH solution. Lignin and hemi-cellulose compositions were reduced after pre-treatment in NaOH solution. Bio-chars for all rice husk varieties showed an increase in lignin content after carbonization. Lignin contents for Robusta coffee husks also increased after carbonization. Cellulose content in bio-chars of both rice and coffee husks reduced drastically after carbonization. A simple regression model relating bulk density and biochemical composition was developed at an accuracy of 70%. Alkaline surface modification and carbonization effects on biochemical properties are due to their impact on the non-cellulosic material and hydrophobicity, respectively, on the fibers.
摘要
研究了碱性表面改性和炭化对乌干达部分稻壳和咖啡壳生物化学性质的影响.碱预处理是以15:1的液比在NaOH中对稻壳进行清洗.预处理用于生物质转化，克服了化学和结构上的困难.炭化导致了生物炭的产生.结果表明，经氢氧化钠溶液预处理后，稻壳及其生物炭的纤维素含量均有所增加.在氢氧化钠溶液中预处理后木质素和半纤维素组分降低.所有稻壳品种的生物炭在炭化后木质素含量均呈上升趋势.经过炭化处理后，罗布斯塔咖啡皮的木质素含量也有所增加.炭化后，稻壳和咖啡壳的生物特性中纤维素含量均显著降低.建立了一个体积密度与生物化学成分的简单回归模型，计算精度为70%.碱表面改性和炭化对生物化学性质的影响是由于它们分别对非纤维素材料和纤维的疏水性的影响.
Acknowledgments
This work was fully supported by the Volkswagen Foundation, grant no. 90016 entitled “Development of bio-composite polymers using rice and coffee husks as fillers”.