Daiane Calheiro

Bio: Daiane Calheiro is an academic researcher from Universidade do Vale do Rio dos Sinos. The author has contributed to research in topics: Husk & Thermoluminescence. The author has an hindex of 4, co-authored 13 publications receiving 245 citations. Previous affiliations of Daiane Calheiro include Universidade Federal do Rio Grande do Sul.

Characterization of Silica Produced from Rice Husk Ash: Comparison of Purification and Processing Methods

Abstract: As a byproduct of the combustion of rice husk to generate energy, rice husk ash (RHA) is formed by silica and carbon, apart from small amounts of other constituents. Several treatments can be used to increase the purity of the silica obtained, or even produce pure silica. The present study tested the efficiency of different techniques to obtain silica, characterizing and comparing the silicas obtained from RHA. A literature review was conducted, and then selected techniques were used to produce silica, which was characterized by XRF, XRD, particle sizing, specific weight, specific surface area, total carbon, and SEM. The literature review showed that most techniques include a pretreatment like acid or alkaline leaching followed by thermal treatment to increase the amount of silica produced by reduction of carbonaceous materials. The results showed that it is possible to produce silica from RHA using simple methods, and that these produced silica with purity above 98%. The treatments that afforded the best results were acid leaching followed by thermal treatment at 800oC, and alkaline extraction at low temperature, with silica purity of 99.3% and 99.6%, respectively.

Caracterização do resíduo industrial casca de arroz com vistas a sua utilização como biomassa

Abstract: O Brasil e o nono maior produtor mundial de arroz e o maior fora da Asia. A casca do arroz e o subproduto mais expressivo do processo de beneficiamento do arroz e seu volume representa cerca de 20% da massa do arroz em casca. Esta casca pode ser considerada uma materia-prima de baixo custo, de dificil reaproveitamento e de baixas propriedades nutritivas. Em funcao do seu elevado poder calorifico, a casca de arroz e hoje considerada uma biomassa, produzida de maneira sustentavel, substituindo o uso convencional de madeira visando a producao de energia. Com o crescente uso da casca como biomassa e a necessidade de obtencao de uma cinza de casca de arroz de melhor qualidade, se faz necessario o aprofundamento de estudos referentes a casca de arroz, atraves de sua caracterizacao. O objetivo deste trabalho e apresentar uma caracterizacao preliminar de duas cascas de arroz de diferentes regioes do estado do Rio Grande do Sul. A fim de utilizar a casa de arroz como biomassa para geracao de energia foram realizadas analises de teor de umidade; cinzas; materiais volateis; carbono fixo, massa especifica, analise termogravimetrica, granulometria e poder calorifico. Os resultados obtidos mostram que as duas cascas analisadas sao muito semelhantes e que estas apresentam elevado potencial de utilizacao como biomassa para geracao de calor e eletricidade.

Potential applications of rice husk ash waste from rice husk biomass power plant

Abstract: Rice husk (RH), an agricultural waste, is abundantly available in rice producing countries like China, India, Bangladesh, Brazil, US, Cambodia, Vietnam, Myanmar, and South East Asia. Despite the massive amount of annual production worldwide, so far RHs have been recycled only for low-value applications. In recent years, many rice mills in rice producing countries have started using RH for the energy production for mill operations as well as household lighting in rural regions. Burning of RHs produces the rice husk ash (RHA). The disposal in landfills or open fields can be problematic and may cause a serious environmental and human health related problems due to the low bulk density of RHA. Several ways are being thought of for disposing RHA by making its commercial use. The amorphous silica forms the main component (83–90%) of RHA. The amorphous silica rich RHA has wide range of applications. High-value applications and current research investigations such as the use of RHA in manufacturing of silica gels, silicon chip, synthesis of activated carbon and silica, production of light weight construction materials and insulation, catalysts, zeolites, ingredients for lithium ion batteries, graphene, energy storage/capacitor, carbon capture, and in drug delivery vehicles are presented. Use of RHA in potential future applications is also discussed. It is suggested that the amorphous silica rich RHA could become a potential resource of low cost precursor for the production of value-added silica based materials for practical applications.

Production and performance of activated carbon from rice husks for removal of natural organic matter from water : A review

Abstract: Adsorption by activated carbon has great potential to improve natural organic matter (NOM) removal from water. However, the high production and regeneration costs limit its wide scale application. ...

Utilization of Waste Straw and Husks from Rice Production: A Review

Abstract: As a staple food for much of the world, rice production is widespread. However, it also results in the generation of large quantities of non-food biomass, primarily in the form of straw and husks. Although they have been little utilized and much rice straw is still simply burned, these lignocellulosic materials potentially have considerable values. This review considers the composition of rice straw and husks, the various processes involved in the production of valuable products, and a range of uses to which they can be put. These include agricultural amendments, energy production, environmental adsorbents, construction materials, and various speciality products.