Title:	Variation in the properties of biochars produced by mixing agricultural residues and mineral soils for agricultural application.
Authors:	MATOSO, S. C. G. WADT, P. G. S. SOUZA JÚNIOR, V. S. de S. PÉREZ, X. L. O.
Affiliation:	Stella Cristiani Gonçalves Matoso, Federal Institute of Education Science and Technology of Rondônia / Biodiversity and Biotechnology Graduate Program – BIONORTE, Federal University of Rondônia PAULO GUILHERME SALVADOR WADT, CPAF-RO Valdomiro Severino de Souza Júnior, Federal Rural University of Pernambuco Xosé Lois Otero Pérez, CRETUS Institute, Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela.
Date Issued:	2020
Citation:	Waste Management & Research, v. 38, n. 9, 0734242X2093518, June 2020.
Description:	The research and application of biochars enriched with minerals have increased in recent years; however, the mineral fraction used consists of specific minerals, such as clay minerals and synthesized compounds. In this work, the effects of adding two specific soil types (sandy and clayey) to rice and coffee husks in order to generate biochars via pyrolysis was investigated. Chemical, physical?chemical, thermal, spectroscopic and crystallographic analyses were conducted on the produced biochars. The study confirmed that the presence of mineral soils during the pyrolysis process increases the yield, C retention ratio, and specific surface area. It also decreases the pH, cation exchange capacity (CEC), nutrient content, and carbon-to-nitrogen ratio of biochars. However, the biochars produced by mixing coffee husks and mineral soils still demonstrate a capacity to increase the pH and the CEC of tropical soils. In addition, increased C retention demonstrates an environmental benefit of this biochar production method. Biomass pyrolysis combined with clayey soil results in a biochar with a higher degree of aromaticity and higher thermal stability when compared to biomass pyrolysis alone. These characteristics give the biochar a recalcitrant character, without the necessity for steps related to the synthesis of specific mineral compounds, which reduces the economic and energy cost of the process.
Thesagro:	Solo Corretivo Resíduo Agrícola Biomassa Casca de Arroz Casca de Café
NAL Thesaurus:	Biochar Pyrolysis Biomass Crop residues Soil amendments
Keywords:	Biocarvão Pirólise Rice husk Coffee husk
DOI:	10.1177/0734242X20935180
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAF-RO)