Biochar from Wood Chips and Corn Cobs for Adsorption of Thioflavin T and Erythrosine B

Pipíška, Martin; Krajčíková, Eva Klára; Hvostik, Milan; Frišták, Vladimír; Ďuriška, Libor; Černičková, Ivona; Kaňuchová, Mária; Conte, Pellegrino; Soja, Gerhard

doi:10.3390/ma15041492

Cited by 24 publications

(11 citation statements)

References 64 publications

(78 reference statements)

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“…Upon increasing the temperature to 600 °C, the resulting biochar had a pH of 9.5 [58]. A similar observation on wood chip biochars pyrolysed at 500 °C was made with biochars having a pH(H 2 O) of 8.58 ± 0.01 [59]. Having a neutral/slightly alkaline surface charge indicates potential application in drinking water systems that operate under acidic conditions without much alternation to target anionic species from effluents [57].…”

Section: Point Of Zero Chargesupporting

confidence: 53%

Design of Experiments Study on Scottish Wood Biochars and Process Parameter Influence on Final Biochar Characteristics

Jamal

Fletcher

2023

Bioenerg. Res.

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Native Scottish wood samples were investigated as potential, locally sourced, raw materials for biochar production. Screening experiments identified pure softwood as the preferable feedstock. Influence of operational parameters, i.e. activating gas flow rate (CO2), heating ramp rate and contact time on final biochar characteristics, was investigated using design of experiments. Surface area and biochar yield were selected as response variables. Minitab was used to define experimental run conditions and suggested an optimal output at 60 min contact time and 15 °C/min ramp rate for maximum responses. The highest surface area (764 m2/g) was achieved at 850 °C from softwood, albeit with a low yield of 15%. Under optimised conditions, the observed surface area was 613 m2/g with ~ 18% yield. Pareto charts suggested no influence of gas flow rate on chosen responses, which correlated well with experimental data. Pore structure was a combination of micro- and mesopores with average pore widths of 3–5 nm and an average point of zero charge of 7.40 ± 0.02. Proximate analysis showed an increase in fixed carbon content from 20%, in the feedstock, to 80%, in the optimised biochar. Morphological analysis showed a layered carbon structure in the biochars. The results show the significance of the selected feedstock as a potential source of biochar material and the relevance of interplay of operational variables in biochar development and their final characteristics.

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Section: Point Of Zero Chargesupporting

confidence: 53%

Design of Experiments Study on Scottish Wood Biochars and Process Parameter Influence on Final Biochar Characteristics

Jamal

Fletcher

2023

Bioenerg. Res.

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“…Upon increasing the temperature to 600°C, the resulting biochar had a pH of 9.5 [72]. A similar observation on wood chip biochars pyrolysed at 500°C was made with biochars having a pH(H 2 O) of 8.58 ± 0.01 [73]. The average PZC of the samples in this study was 7.40 ± 0.02, indicating potential application of these biochars to drinking water treatment systems without considerable pH alternation to target anionic species from e uents and treatment systems, or for cationic species by slightly reducing the system pH [71].…”

Section: Point Of Zero Chargesupporting

confidence: 63%

Design of Experiments optimisation of Scottish wood biochars and process parameter significance for target applications

Jamal

Fletcher

2022

Preprint

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Biochar production from sustainable materials through pyrolysis remains a key area of research, where additional value can be gained by understanding the influence of initial operating parameters to create optimised carbon products with different characteristics. In this study, native Scottish wood samples were used to produce biochars. Softwood and hardwood samples were investigated to determine feedstock importance, with a focus on the influence of process conditions on the final characteristics of biochars. Screening experiments helped to determine that the softwood feedstock resulted in enhanced product characteristics and identified the optimal pyrolysis temperature. A design of experiments approach was used to scope process variables for softwood feedstock: contact time with activating agent, gas flowrate, and influence of ramp rate during pyrolysis were studied. The response variables were product yield and biochar surface area. As expected, product yield decreased with increasing pyrolysis temperature, and increased ramp rates decreased biochar yield. Pore structure was a combination of micro- and mesopores, and high gas flowrate and pyrolysis temperature produced biochars with the greatest surface areas, while morphological analysis suggests a layered carbon structure. Contact angle analysis suggested hydrophilicity, suggesting compatibility with aqueous media, while a neutral surface charge demonstrates easy application in drinking water treatment systems. The results show the potential of parameter optimisation and insight into the interplay of these variables in biochar development, with characteristics that can be tailored to a range of applications.

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“…Phosphoric acid and Zinc chloride are two of the most often used activating agents in chemical activation, aside from NaOH and KOH [20,21]. Therefore, many research studies have been published during the last couple of years investigating the use of biochar to adsorb dyes and in wastewater treatment processes [22][23][24][25][26][27][28][29][30][31][32][33]. CV and/or MB dyes were adsorbed from aqueous media by various types of biochar such as eucalyptus camaldulensis biochar (Ec-bio) [22], porous biochar [23], mesoporous seaweed biochar [24], castor biomass-based biochar [25], adsorbents from orange peel residues [26], biochar at different carbonization times [28], date palm fronds biochars [31], and rice husk-mediated magnetic biochar (RH-MBC) [33].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Effective Biochar Biosorbent Derived from Agricultural Waste to Remove Cationic Dyes from Wastewater

et al. 2022

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The main aim of this work is to treat sugarcane bagasse agricultural waste and prepare an efficient, promising, and eco-friendly adsorbent material. Biochar is an example of such a material, and it is an extremely versatile and eco-friendly biosorbent to treat wastewater. Crystal violet (CV)-dye and methylene blue (MB)-dye species are examples of serious organic pollutants. Herein, biochar was prepared firstly from sugarcane bagasse (SCB), and then a biochar biosorbent was synthesized through pyrolysis and surface activation with NaOH. SEM, TEM, FTIR, Raman, surface area, XRD, and EDX were used to characterize the investigated materials. The reuse of such waste materials is considered eco-friendly in nature. After that, the adsorption of MB and CV-species from synthetically prepared wastewater using treated biochar was investigated under various conditions. To demonstrate the study’s effectiveness, it was attempted to achieve optimum effectiveness at an optimum level by working with time, adsorbent dose, dye concentration, NaCl, pH, and temperature. The number of adsorbed dyes reduced as the dye concentrations increased and marginally decreased with NaCl but increased with the adsorbent dosage, pH, and temperature of the solution increased. Furthermore, it climbed for around 15 min before reaching equilibrium, indicating that all pores were almost full. Under the optimum condition, the removal perecentages of both MB and CV-dyes were ≥ 98%. The obtained equilibrium data was represented by Langmuir and Freundlich isotherm models. Additionally, the thermodynamic parameters were examined at various temperatures. The results illustrated that the Langmuir isotherm was utilized to explain the experimental adsorption processes with maximum adsorption capacities of MB and CV-dyes were 114.42 and 99.50 mgg−1, respectively. The kinetic data were estimated by pseudo-first and pseudo-second-order equations. The best correlation coefficients of the investigated adsorption processes were described by the pseudo-second-order kinetic model. Finally, the data obtained were compared with some works published during the last four years.

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Biochar from Wood Chips and Corn Cobs for Adsorption of Thioflavin T and Erythrosine B

Cited by 24 publications

References 64 publications

Design of Experiments Study on Scottish Wood Biochars and Process Parameter Influence on Final Biochar Characteristics

Design of Experiments Study on Scottish Wood Biochars and Process Parameter Influence on Final Biochar Characteristics

Design of Experiments optimisation of Scottish wood biochars and process parameter significance for target applications

Fabrication and Characterization of Effective Biochar Biosorbent Derived from Agricultural Waste to Remove Cationic Dyes from Wastewater

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