This work aims to verify the possibility of valuing coconut husk fiber through pyrolysis for the production of carbonized, and evaluate the influence of the pyrolysis conditions in its potential to use as a soil conditioner. Biomass were pyrolyzed used the peak temperatures of 350, 450 and 550 °C, with immersion time of 30 minutes. The characterization included analyses of bulk density, proximate analyses, X-RF, total carbon, pH, electrical conductivity, thermal analysis of biomass and cation exchange capacity in carbonized. The results indicate that the fiber has relevant properties for thermochemical conversion and the pyrolysis temperature influenced the characteristics of the carbonized. The X-RF showed that the carbonized presents K, Cl, Ca, Na and Mg content in its composition. The pH proved to be alkaline for the carbonized. It was possible to conclude that the carbonized produced have viable characteristics for its application as a soil conditioner.
O setor agroindustrial tem hoje um grande desafio, suprir a demanda mundial. Toneladas de alimentos são produzidos e beneficiados todos os dias no mundo inteiro. A geração de resíduos do setor cresce proporcionalmente a produção, o que ressalta a importância de viabilizar a valorização dos mesmos. Diante desse contexto este trabalho analisa os biocarvões, produzidos a partir de bagaço de cana-de-açúcar, cascas de arroz e cascas de coco verde, com o propósito foi verificar a influência da temperatura sobre parâmetros como o potencial hidrogeniônico, condutividade e capacidade de troca catiônica dos biocarvões obtidos dos diferentes tipos de biomassa. O processo de pirólise foi realizado em um reator de bancada com regime de leito fixo com as seguintes configurações: temperaturas de pico de 350, 450 e 550 °C; taxa de aquecimento de 10 °C min-1; e tempo de imersão de 30 minutos. Os resultados obtidos indicam o tipo de biomassa e as condições operatórias mais indicados para se obter um biocarvão que preencha os requisitos mínimos para ser usado como condicionador de solo. A casca de coco verde apresentou as condições mais interessantes, obteve com 10,3 μ/s (pH) e 1945 uScm-1 (condutividade) a 550°C e 87 mmol/kg (capacidade de troca catiônica) a 450°C. Por meio dos resultados foi possível identificar que biocarvões obtidos em temperaturas mais elevadas apresentaram condições mais favoráveis para a aplicação em perspectiva.
Several mitigation processes involving carbon dioxide injection into adsorbent materials such as zeolites, are currently very popular as research studies. The objective of our present work is to apply the green synthesis method of molecular sieve with rice husk ash and metakaolin in four individual Si/Al ratios (20, 40, 60 and 80). The micrographs obtained with the aid of SEM (sample 80-ZSM-5) revealed a spherical morphology with aggregated particles. Analysis executed with EDS (Energy Dispersive Spectroscopy) confirmed the presence of Si, Al, O, K and Na. X-ray diffraction helped in the identification of crystalline phases related to the structures of zeolites mordenite and ZSM-5 (mostly). The zeolitic materials were tested for CO2 adsorption assays. The results demonstrated a considerable capacity of CO2 adsorption by 6.5 mmol g−1 of adsorbent at the pressure of 9 bar. Therefore, this research establishes zeolites of ZSM-5 type to be promising as adsorbents for CO2 capture.
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