Characterization of biochars from different sources and evaluation of release of nutrients and contaminants

Figueredo, Natália Aragão de; Costa, Liovando Marciano da; Melo, Leônidas Carrijo Azevedo; Siebeneichlerd, Evair Antônio; Tronto, Jairo

doi:10.5935/1806-6690.20170046

Cited by 76 publications

(35 citation statements)

References 2 publications

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“…Also, Chang et al (2015) reported high N content (14.12%) in biochar produced from microalgae. Biochar produced from sewage sludge (at 350 °C) had more N (3.17%) than that produced from sugarcane and eucalyptus wastes (1.4 and 0.4%, respectively) (Figueredo et al 2017). Furthermore, N content of biochar decreases with an increase in the pyrolytic temperature (Fig.…”

Section: Nitrogenmentioning

confidence: 93%

Biochar and its importance on nutrient dynamics in soil and plant

Hossain

Bahar

Sarkar

et al. 2020

Biochar

287

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Biochar, an environmentally friendly soil conditioner, is produced using several thermochemical processes. It has unique characteristics like high surface area, porosity, and surface charges. This paper reviews the fertilizer value of biochar, and its effects on soil properties, and nutrient use efficiency of crops. Biochar serves as an important source of plant nutrients, especially nitrogen in biochar produced from manures and wastes at low temperature (≤ 400 °C). The phosphorus, potassium, and other nutrient contents are higher in manure/waste biochars than those in crop residues and woody biochars. The nutrient contents and pH of biochar are positively correlated with pyrolysis temperature, except for nitrogen content. Biochar improves the nutrient retention capacity of soil, which depends on porosity and surface charge of biochar. Biochar increases nitrogen retention in soil by reducing leaching and gaseous loss, and also increases phosphorus availability by decreasing the leaching process in soil. However, for potassium and other nutrients, biochar shows inconsistent (positive and negative) impacts on soil. After addition of biochar, porosity, aggregate stability, and amount of water held in soil increase and bulk density decreases. Mostly, biochar increases soil pH and, thus, influences nutrient availability for plants. Biochar also alters soil biological properties by increasing microbial populations, enzyme activity, soil respiration, and microbial biomass. Finally, nutrient use efficiency and nutrient uptake improve with the application of biochar to soil. Thus, biochar can be a potential nutrient reservoir for plants and a good amendment to improve soil properties.

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Section: Nitrogenmentioning

confidence: 93%

Biochar and its importance on nutrient dynamics in soil and plant

Hossain

Bahar

Sarkar

et al. 2020

Biochar

287

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“…A high pyrolysis temperature leads to an even greater reduction in C and N concentrations. Greater C stability may occur due to secondary reactions in a very slow speed carbonization, which forms more recalcitrant biochars (FIGUEREDO et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Explaining the Water-Holding Capacity of Biochar by Scanning Electron Microscope Images

et al. 2018

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Biochar is a solid material formed during biomass thermochemical decomposition processes. This organic compound has particular properties that may cause effects on soils depending on its feedstock and processing conditions. Thus, the characteristics and purpose of use of this material must be recognized prior to its use. Two types of biochar, derived from different wood sources, were compared, one from caatinga biome species and another from cashew trees. Two species from caatinga biome were used, jurema-preta (Mimosa tenuiflora Willd. Poir.), and marmeleiro (Croton sonderianus Müll. Arg.). This study aimed to identify the best biochar material regionally available to increase water-holding capacity in the soil, based on laboratory tests and microstructural porosity evaluation. Biochar from Caatinga wood demonstrated an improved water-holding capacity if compared to cashew wood biochar. The particle diameters of 2 and 4 mm showed the highest levels, which were 2,268 g.g-1 for caatinga wood and 0.574 g.g-1 for cashew wood biochars, respectively. While the smaller quantities of macropores and a larger number of micropores (smaller radius) could explain the higher water-holding capacity for biochar from caatinga wood, the thick lignified cell walls of biochar from cashew wood support the idea of a hydrophobic effect contributing to water lower holding capacity.

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“…Studies in the literature mention biocarbons for the removal of lead ions in water. These biocarbons can be produced from Orbignya martiana (babassu) (Golin, 2007); Cocos nucifera L. (green coconut) (Ferreira, Silva, Lima, & Begnini, 2012); Saccharum officinarum L. (sugarcane) (Figueredo, Costa, Melo, Siebeneichlerd, & Tronto, 2017;Ferreira, 2018); Araucaria angustifolia (pine nut) (Lage Junior, 2016); Theobroma cacao (cocoa) (Lara, Tejada, Villabona, Arrieta & Conde, 2016).…”

Section: Leadmentioning

confidence: 99%

“…As can be observed, several biomasses are being studied for the purpose of producing biochars aiming at adsorption of lead ions in water. Figueredo et al (2017) and Ferreira (2018) used sugarcane residues to produce biochars with different activation conditions and found very different efficiencies for removing lead in aqueous solutions. This demonstrates that a certain method can render the produced biochar unviable for use in lead adsorption due to its low efficiency.…”

Section: Leadmentioning

confidence: 99%

“…Among the biomasses used for this purpose, it can be highlighted the sugarcane residues studied by Ferreira et al (2015), Figueredo et al (2017), Silva (2017), and Ferreira (2018) for the removal of copper, lead, and chromium ions. The biochars produced obtained removal efficiency of 96% for lead and above 99% for copper and chromium.…”

Section: Evaluation Of Biochars In the Removal Of Heavy Metals In Aqumentioning

confidence: 99%

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Efficiency of biochars in the removal of heavy metals

et al. 2019

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Toxic metals are naturally present in the environment even if there is no anthropic action. Several methods are used for the removal of these metals from water and effluents, such as: chemical precipitation, oxidation/reduction, filtration, ion exchange, membrane separation, and adsorption. Biosorption stands out as an effective treatment because it has a high rate of renewal in nature, low production costs, and high removal of metals due to the possibility of recovery of the contaminant, either by incinerating the biomass or by desorbing it. Thus, this study identified some biochars used as adsorbents for the removal of copper, lead, chromium, and mercury in water. It can be concluded from this study that adsorption is a very efficient technique for removing or recovering heavy metals from the environment. These biocarbons are alternatives that can replace commercial activated carbon because, besides having a low production cost, they have been shown to efficiently remove metal ions, ensuring an effective treatment in compliance with effluent release standards.

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Characterization of biochars from different sources and evaluation of release of nutrients and contaminants

Cited by 76 publications

References 2 publications

Biochar and its importance on nutrient dynamics in soil and plant

Biochar and its importance on nutrient dynamics in soil and plant

Explaining the Water-Holding Capacity of Biochar by Scanning Electron Microscope Images

Efficiency of biochars in the removal of heavy metals

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