Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

Fałtynowicz, Hanna; Kaczmarczyk, Jan; Kułażyński, Marek

doi:10.1515/chem-2015-0128

Cited by 24 publications

(16 citation statements)

References 32 publications

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“…The KOH‐to‐char ratio is critical for obtaining biochar with high porosity and large pore size. A study by Fałtynowicz, Kaczmarczyk, and Kułazyński () observed a well‐developed porous texture of activated carbons when the KOH‐to‐char weight proportion was expanded from 2:1 to 3:1; however, the additional increment in the KOH‐to‐char proportion did not have a detectable effect. Therefore, the KOH‐to‐char ratio in this study was set at 3:1 for all the batches.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Asadullah

Kaewsichan

Tohdee

2019

Water Environment Research

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Hydrochar obtained after hydrothermal carbonization (HTC) of Lepironia articulata (LA) was modified into biochar by reacting with a specific amount of KOH in a tubular reactor under slow pyrolysis. The physical and chemical properties of the hydrochar and modified biochar were characterized. The performance of modified biochar (LABC) was investigated through batch sorption experiments. Removal (%) and the maximum adsorption capacity (q max ) of Cr(VI) onto LABC increased up to 98.9% and 28.75 mg/g relative to 63.44% and 21.90 mg/g in unmodified hydrochar (LAHC) at pH 2.0, 313 K, and 200 mg/L, respectively. The sorption kinetics uptake data were best interpreted with pseudo-second-order model, and sorption isotherm was simulated with the Langmuir adsorption model. The thermodynamic parameters confirm the adsorption process to be an endothermic, spontaneous, and increased disorder. The overall results revealed that LABC can be utilized as an environmentally friendly, inexpensive, and effective adsorbent in Cr(VI) removal. • Practitioner points• Hydrochar and modified biochar prepared from a tropical biomass (Lepironia articulata) were successfully used for the removal of Cr(VI) from aqueous solution. • Increased specific surface was obtained by applying chemical modification with alkali treatment, contributing to effectiveness as adsorbent. • Dimensionless K c was estimated from the Langmuir fits and then used to estimate thermodynamics of adsorption. • The signs of ∆H°, ∆G°, and ∆S° indicate that the adsorption of Cr(VI) onto LABC was an endothermic, spontaneous, and increased disorder.

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Section: Methodsmentioning

confidence: 99%

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Asadullah

Kaewsichan

Tohdee

2019

Water Environment Research

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“…1). Biomass of this plant was investigated previously as feedstock for production of energy and activated carbons (Strašil and Kára 2010;Fałtynowicz et al 2015). This plant produces many secondary metabolites (Table 2) that are medically valuable, such as and phenylpropanoid glycosides.…”

Section: Giant Knotweed (Fallopia Sachalinensis Reynoutria Sachalinementioning

confidence: 99%

Phytochemicals in bioenergy crops

2019

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The use of natural compounds derived from agricultural crops and other plants as health promoting chemicals gains tremendous growing interest in various industrial sectors as well as among people worldwide. These chemicals have been more and more employed by the food industry as food additives, functional food ingredients, nutraceuticals, by feedstuffs industry, but also by the cosmetic and pharmaceutical industries. The general idea for this interest is to use natural products as potential alternatives to synthetic chemicals. On the other hand, some plants characterized by high yield and being used as energy crops also contained significant amount of bioactive compounds. This review focuses on the wide spectrum of the phytochemicals present in available biomass plants. It is supposed that extraction of bioactive chemicals from energy crops before their energetic use may increase economical effectiveness, providing simultaneously a double benefit in the form of phytochemicals and bioenergy as value added products. This remains in line with bioeconomy, which is defined by European Commission as ''the production of renewable biological resources and the conversion of these resources and waste streams into value added products, such as food, feed, bio-based products and bioenergy''. However, the issue is still a challenging effort due to the high costs, technology readiness and regulatory hurdles.

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“…This observation is attributed to the intrinsic wider pore size characterized by G2, which allows efficient surface coating on the inner pore walls (Adelodun et al, 2015;Faltynowicz et al, 2015). This reduces the effect of blockage of narrower pores (supermicropores) which G1 is inherently susceptible to.…”

Section: Textural Characteristics Of Adsorbentsmentioning

confidence: 99%

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO 2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO 2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO 2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO 2 were desorbed below 500°C. The kinetic study indicated that CO 2 -AC interaction follows pseudo-second order while the higher R 2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO 2 -laden adsorbents at environmental levels.

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Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

Cited by 24 publications

References 32 publications

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Adsorption of hexavalent chromium onto alkali‐modified biochar derived from Lepironia articulata: A kinetic, equilibrium, and thermodynamic study

Phytochemicals in bioenergy crops

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

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