Different Plant Biomass Characterizations for Biochar Production

Veiga, Tais Regina Lima Abreu; Lima, José Tarcísio; Dessimoni, Anelise Lima de Abreu; Pego, Matheus Felipe Freire; Ribeiro-Soares, J.; Trugilho, Paulo Fernando

doi:10.1590/01047760201723042373

Cited by 48 publications

(28 citation statements)

References 26 publications

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“…The high CEC observed for CH biochar is possibly due to the high K content in the feedstock, which during pyrolysis can intercalate and cause the separation of carbonaceous lamellae by the oxidation of cross-linking C atoms [29]. According to Veiga et al [53], compared to wood biomasses, coffee husk has greater lignin, ash and fixed C contents, which contribute to its higher thermal stability evidenced by thermal gravimetric analysis. The presence of K in the feedstock alters C degradation due to a greater thermal stability of organic compounds formed during pyrolysis [54].…”

Section: Soil Cation Exchange Capacitymentioning

confidence: 99%

Enhancing Cation Exchange Capacity of Weathered Soils Using Biochar: Feedstock, Pyrolysis Conditions and Addition Rate

Domingues¹,

et al. 2020

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The addition of alkaline and high-cation exchange capacity (CEC) biochars is a suitable strategy to increase the CEC of weathered soils. The aim of this study was to evaluate the effect of biochar from different feedstocks and pyrolysis temperatures on the CEC of two contrasting Oxisols. Biochars produced from chicken manure (CM), eucalyptus sawdust (ES), coffee husk (CH) and sugarcane bagasse (SB),plus a control (without biochar), at 350, 450, and 750 °C were mixed with the soils at 2; 5; 10 and 20% (w/w) and incubated for 9 months. Feedstock, pyrolysis temperature and addition rate of biochar were key factors controlling the alteration of soil CEC. The CH biochar pyrolyzed at 350 °C was the most effective matrix at increasing soil CEC. In a rate-dependent way, ES and SB biochars increased C contents of both soils without improving soil CEC. The efficiency of high-ash biochars in enhancing soil CEC in both Oxisols was limited by the alkalization caused by high rates of CH and CM biochars. The increase in CEC is soil-dependent and modulated by high-ash biochar CEC and application rate, as well as by the original soil CEC.

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Section: Soil Cation Exchange Capacitymentioning

confidence: 99%

Enhancing Cation Exchange Capacity of Weathered Soils Using Biochar: Feedstock, Pyrolysis Conditions and Addition Rate

Domingues¹,

et al. 2020

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“…The peaks located at 1746 and 1628 cm −1 are attributed to stretching vibrations of aldehydes and ketones, and peak at 1429 cm −1 can be assigned to carboxyl group C-O bond stretching vibration. Peaks at 1248 and 1437 cm −1 correspond to C-N stretching vibration of the amine group and O-H bending vibration of the carboxylic group, respectively [43][44][45][46][47][48].…”

Section: Ftir Analysismentioning

confidence: 99%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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Coffee husk (CH) was physically and chemically treated with autoclaving (SCH) and NaOH (NCH) to develop low-cost adsorbent for the removal of methylene blue (MB) from synthetic wastewater, and their adsorption efficiencies were evaluated in batch mode. The prepared adsorbent was characterised by SEM, FTIR and point of zero charge. The central composite rotatable design (CCRD) was employed to optimise the adsorption process parameters such as pH, adsorbent dosage and initial MB concentration. The second-order quadratic model fitted best with the experimental adsorption data, and ANOVA results showed that the developed model was significant. The linear terms in the model significantly influence the adsorption capacity of SCH and NCH, but interaction terms were not significant. At optimised conditions, the developed adsorbents can remove > 90% of MB from the aqueous solution. Freundlich model showed a better fit with the adsorption isotherm data with R 2 greater than 0.95. Kinetics of MB adsorption onto SCH and NCH followed the pseudo-second-order model. The maximum monolayer adsorption capacity was found to be 129 and 200 mg/g for SCH and NCH, respectively. The present study showed that pretreated coffee husk waste can be used as an alternative for expensive adsorbents for the removal of dyes from wastewater.

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“…The biochar proved to be very concentrated in carbon, overcoming 70% in mass; which is superior to values close to 50% of C in eucalyptus wood. 33,34 It has been known that during pyrolysis there is an increasing of aromaticity through the establishment of carboncarbon bond and loss of O and H, 34 which resulted in O/C ratio values of 0,22 and H/C of 0,46 less than eucalyptus wood values, equals to 0,67 and 1,45, respectively. 35 After comparing band and functional groups of Table 3 with other results from literature, 36,37 one seen that biochar still presents original peaks of biomass, such as OH band and cellulose and lignin signs.…”

Section: Resultsmentioning

confidence: 99%

Carbon stability and biochar aging process after soil application

Tozzi¹,

Puga²,

Carvalho³

et al. 2019

HIJ

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During the pyrolysis process for biochar production there is the stabilization of C in aromatic compounds, which accredits biochar to function as an input for C sequestration in the soil. The aim of this study was assessing of C sequestration potential through pyrolyzed biochar in low temperature (350-400 o C), checking the possible deleterious effect in soil organic matter (SOM) and assessing the cation exchange capacity (CEC) alteration, as the biochar is aging. The research strategy involved, besides the materials characterization, the installation and conduction of two incubations under controlled laboratory conditions. The evaluation of the biochar stability of C carbon, the effects on SOM and, therefore, the potential for the use of biochar in soil C sequestration was carried out in a respirometric experiment, with four typical tropical soil samples mixed with eucalyptus biochar dose (0.0, 2.5, 5.0, 10.0 and 20.0 g Ckg-1). After 120 days of incubation under non-limiting temperature and moisture conditions, the results showed C mineralization rates between 0,4 and 9,3%, which demonstrates the high carbon stability in the biochar. Through the 13 C technique in soil analysis at the end of the incubation was observed small reductions of original C in SOM for two of the evaluated soils, although gains from biochar application represented more than double the original C content of soils. The 360-day incubation experiment to evaluate biochar aging, focusing on the generation of negative charges, considered the variation in the presence or absence of soil; moisture and temperature (25 or 32°C). Among the factors tested, there was only effect of time on CEC. The increase in CEC was practically 100 mmol c kg-1 in one year, which represented a 50% increase in surface charges due to the biochar aging process. The research led to the conclusion that biochar must be considered an input to soil C sequestration, in the reason of its high stability after application, recommending the use of the conservative value of 90% of the total C applied via biochar rate to environmental accounting related to C sequestration. In addition, increases in CEC in biochar treated soils are expected due to biochar surface charges as well as the aging process after application.

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Different Plant Biomass Characterizations for Biochar Production

Cited by 48 publications

References 26 publications

Enhancing Cation Exchange Capacity of Weathered Soils Using Biochar: Feedstock, Pyrolysis Conditions and Addition Rate

Enhancing Cation Exchange Capacity of Weathered Soils Using Biochar: Feedstock, Pyrolysis Conditions and Addition Rate

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Carbon stability and biochar aging process after soil application

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