High-performance porous biochar from the pyrolysis of natural and renewable seaweed (Gelidiella acerosa) and its application for the adsorption of methylene blue

Ahmed, Muthanna J.; Okoye, Patrick U.; Hummadi, Esam H.; Hameed, B.H.

doi:10.1016/j.biortech.2019.01.054

Cited by 203 publications

(54 citation statements)

References 33 publications

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“…5) and pseudo-second-rate equations (Eq. (6)) were used where k 1 and k 2 are the respective rate constants [39,40]. In considering rates of adsorption, it is assumed that MB diffusion through the bulk solution onto the adsorbent particle was eliminated by vigorous shaking.…”

Section: Kinetics Of Mb Adsorptionmentioning

confidence: 99%

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Magnetic rice husk ash 'cleanser' as efficient methylene blue adsorbent

Lawagon

Amon

2019

Environmental Engineering Research

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Burning of agricultural residues has been a prevalent cause of environmental concern especially in developing countries. In the Philippines, rice husks are usually burned in open air and either usually left in the field or rarely collected to be sold in the wet market as a cleanser. Hence in this study, an alternative use of this burning residue (rice husks ash, RHA) for removal of dyes from aqueous solutions was explored. Yet, its applications in real wastewater will be difficult in its pristine powdered form. Therefore, the RHA was functionalized with Fe3O4 to become inherently magnetic (MRHA), providing relative ease in handling. The RHA used was obtained from the local markets of Davao City, Philippines. Systematic adsorption studies on the effects of contact time, solution pH, solid/liquid ratio, and feed concentration were conducted. MB adsorption was Langmuir-type and followed a pseudo-second-order rate model. Its adsorption rate is significantly fast (t = 10 min, k2 = 0.015 g mg-1 min-1) with high qm (150.5 mg g-1). MRHA was highly stable and reusable (> 10 cycles) demonstrating its high potential as an economical alternative for treatment of dye contaminated wastewater.

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Section: Kinetics Of Mb Adsorptionmentioning

confidence: 99%

“…7) and Freundlich models (Eq. (8)) [19,40]. These isotherms relate the amount of MB adsorbed (q e ) to the equilibrium MB concentration in the solution (C e ) at a given temperature.…”

Section: Mb Adsorption Isothermmentioning

confidence: 99%

Magnetic rice husk ash 'cleanser' as efficient methylene blue adsorbent

Lawagon

Amon

2019

Environmental Engineering Research

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“…Biochar, a carbon-rich, non-volatile solid residue product obtained from the carbonization of biomass or agricultural waste materials in the presence of little to no air, has been used in various applications such as fertilizers [28], dye colorant, and harmful chemical absorbent [29][30][31][32], as well as soil conditioner [33]. Its relevance with regard to preparing Mg/C composite for hydrogen storage is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Yeboah

Zhou

2020

Materials

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In this investigation, an easily-operated and cost-effective method is utilized to synthesize biochar in ambient air, and the prepared biochar is used in a novel manner as a milling aid for fabricating Mg-biochar composites for hydrogen storage. X-ray diffractometry reveals that increasing the content of palm kernel shell biochar (PKSBC) from 5 wt.% to 20 wt.% enhances the hydrogen absorption performance by increasing the conversion of Mg into MgH2 from 83% to 93%. A 40 °C reduction in decomposition temperature of MgH2 is recorded from differential scanning calorimetry curves when the content of PKSBC is increased to 20 wt.%. Magnesium is milled and hydrided under the same experimental conditions and used as a reference material. It is proposed that these property enhancements can be attributed to the fact that PKSBC acts as an anti-sticking agent for elemental Mg powders, helping in the achievement of a more dispersed composite with reduced Mg particle size due to its layered-like carbon structure.

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“…Usually, mesoporous carbons can also be prepared as porous carbons by direct pyrolytic carbonization or the combination with chemical activation of carbon‐rich fragments at high temperatures . Although the simple pyrolysis of sludge can produce porous adsorbents, chemical treatment, such as acid pickling, or chemical activation with ZnCl 2 or KOH are sometimes also applied. Generally, pyrolysis in the presence of chemical agents significantly increases the microporosity as well as the specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Sludge‐based mesoporous activated carbon: the effect of hydrothermal pretreatment on material preparation and adsorption of bisphenol A

Wang

Song

2020

J of Chemical Tech & Biotech

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Background: The excess sludge produced by sewage treatment plants contains a large number of pollutants, which is of huge environmental risk. Transforming this kind of solid waste into adsorption materials is an effective approach to realize the resource utilization of sludge. Combined with hydrothermal pretreatment and chemical activation, the synthesis of sludgebased mesoporous carbon is used to remove bisphenol A (BPA) in wastewater.Results: A resource recycling measure to prepare mesoporous activated carbons (MACs) from sewage sludge was developed via the combination of hydrothermal pretreatment and chemical activation using sewage sludge and sulfuric acid as carbon precursor and activating agent, respectively. The combination of hydrothermal pretreatment and chemical activation not only can make efficient use of the activating agents but also facilitate the deep pyrolysis of the sludge. The resultant MAC obtained using the hydrothermal pretreatment possessed a larger total surface area, less crystalline phase and a narrower pore size distribution compared to other samples. Meanwhile, the MAC obtained from hydrothermal pretreatment presented the highest amount of adsorption of BPA and achieved a better capture than the reference commercial activated carbons. In addition, a possible adsorption mechanism has been proposed to further analyze the enhanced adsorption performance.Conclusions: The yield and mesoporous content of the obtained MAC is 59.19% and 31.51%, respectively. The maximum adsorption capacity for BPA is 137.87 mg g −1 . Microporosity, hydrogen bonding and π-π effect introduced by the hydrothermal pretreatment play an important role in BPA adsorption.

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High-performance porous biochar from the pyrolysis of natural and renewable seaweed (Gelidiella acerosa) and its application for the adsorption of methylene blue

Cited by 203 publications

References 33 publications

Magnetic rice husk ash 'cleanser' as efficient methylene blue adsorbent

Magnetic rice husk ash 'cleanser' as efficient methylene blue adsorbent

Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Sludge‐based mesoporous activated carbon: the effect of hydrothermal pretreatment on material preparation and adsorption of bisphenol A

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