Abstract

Besides mineral sources, silica can be found in plants, particularly in the epidermis, since during their growth plants absorb the mono-silicic acid present in the soil, storing it as a natural form of protection, insect pest control and transpiration regulator. Among the plants that present high levels of silica in their ashes, we can highlight sugarcane, with Brazil being the largest producer of sugarcane derived (sugar and bioethanol) in the world, accounting 615 million tons per year. Thus, the increasing of the international demand encourages an increase of the availability of sugarcane wastes, pushing its use for the generation of electric power, as for other purposes enabling a sustainable development. In this work, high purity silica nanoparticles (up to 95%) with predominantly amorphous microstructure were obtained after thermal (500 to 700 °C) and chemical treatments (1 molar hydrochloric acid solution, 10% volume) of sugarcane bagasse and leaves ashes. The obtained results indicate the possibility of using this silica in ceramics, glasses, refractory materials and construction applications, as well as in the cosmetic and pharmaceutical industry, molecular sieves and mesoporous membranes. The silica obtained in this research also proved to be suitable for obtaining porous silicon (using magnesiothermic reduction), where the experimental procedure employed is described elsewhere.

Graphic Abstract

中文翻译：

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从甘蔗渣和叶灰中获得生物硅

摘要

除矿物质外，在植物中，特别是在表皮中还可以发现二氧化硅，因为在植物生长期间，二氧化硅会吸收土壤中存在的单硅酸，并将其储存为天然形式的保护剂，害虫控制和蒸腾调节剂。在灰烬中二氧化硅含量高的植物中，我们可以强调一下甘蔗，巴西是世界上最大的甘蔗衍生产品（糖和生物乙醇）生产国，每年产量为6.15亿吨。因此，国际需求的增加鼓励了甘蔗废料的增加，推动其用于发电，以及实现可持续发展的其他目的。在这项工作中 在对甘蔗渣和烟灰进行热（500至700°C）和化学处理（1摩尔盐酸溶液，10％体积）后，获得了主要具有非晶态微结构的高纯度二氧化硅纳米颗粒（高达95％）。所得结果表明该二氧化硅可用于陶瓷，玻璃，耐火材料和建筑应用以及化妆品和制药行业，分子筛和中孔膜中。这项研究中获得的二氧化硅也被证明适用于获得多孔硅（使用镁热还原法），在其他地方描述了所采用的实验程序。所得结果表明该二氧化硅可用于陶瓷，玻璃，耐火材料和建筑应用以及化妆品和制药行业，分子筛和中孔膜中。这项研究中获得的二氧化硅也被证明适用于获得多孔硅（使用镁热还原法），在其他地方描述了所采用的实验程序。所得结果表明该二氧化硅可用于陶瓷，玻璃，耐火材料和建筑应用以及化妆品和制药工业，分子筛和中孔膜中。这项研究中获得的二氧化硅也被证明适用于获得多孔硅（使用镁热还原法），在其他地方描述了所采用的实验程序。

图形摘要