Upcycling olive oil cake through wet torrefaction to produce hydrochar for water decontamination

Alshareef, Shareefa Ahmed; Otero, Marta; Alanazi, Hamdah S.; Siddiqui, Masoom Raza; Khan, Moonis Ali; ALOthman, Zeid A.

doi:10.1016/j.cherd.2021.03.031

Cited by 32 publications

(12 citation statements)

References 58 publications

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“…In this study, electrostatic interaction (cation and anion attraction) is an important mechanism in the adsorption of BR46 onto biochar at experimental conditions, as described in the influence of pH section above. O-containing functional groups are considered to serve as H-bond acceptors [7,55]. The FTIR analysis performed in this study revealed that R500 contains more O-containing functional groups than B500.…”

Section: Plos Onementioning

confidence: 76%

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Biochars derived from bamboo and rice straw for sorption of basic red dyes

Sackey

Song

et al. 2021

PLoS ONE

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The primary purpose of this study is to eliminate Basic Red 46 dye from aqueous solutions utilizing batch experiments by adsorption on biochars prepared from bamboo and rice straw biomass. Biochars prepared from bamboo (B), and rice straw (R) was pyrolyzed at 500°C (B500 and R500). Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), and surface area and porosity analyzers were used to characterize the B500 and R500 samples. The characterization results indicated that the biochars possessed an amorphous porous structure with many functional groups consisting primarily of silicates. The adsorption rate of BR46 was evaluated using two kinetic models (pseudo-first-order and pseudo-second-order), and the results indicated that the pseudo-second-order model fitted to the experimental data well (R2>0.99). Nearly 24 h was sufficient to achieve equilibrium with the dye adsorption for the two biochars. R500 had a greater adsorption efficiency than B500. As pH levels increased, the dye’s adsorption capability increased as well. The Langmuir and Freundlich isotherm models were used to investigate the equilibrium behavior of BR46 adsorption, and the equilibrium data fitted well with the Langmuir model (R2>0.99) compared to the Freundlich model (R2>0.89). The maximum adsorption capacities of BR46 are 9.06 mg/g for B500 and 22.12 mg/g for R500, respectively. Additionally, adsorption capacity increased as temperature increased, indicating that adsorption is favored at higher temperatures. The electrostatic interaction is shown to be the dominant mechanism of BR46 adsorption, and BR46 acts as an electron-acceptor, contributing to n-π EDA (Electron Donor-Acceptor) interaction. Thermodynamic parameters for the dye-adsorbent system revealed that the adsorption process is spontaneous and feasible. The values of the adsorption coefficient (Kd) were on the order of 102−103. Kd of R500 was greater than that of B500, indicating that R500 had a greater adsorption capacity. The results showed that R500 could be used as a low-cost alternative adsorbent for removing BR46 from effluents.

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Section: Plos Onementioning

confidence: 76%

“…of these bands. In addition, agricultural biomasses primarily consist of lignin, cellulose, hemicelluloses, and proteins, making them excellent dye adsorbents [55].…”

Section: Plos Onementioning

confidence: 99%

Biochars derived from bamboo and rice straw for sorption of basic red dyes

Sackey

Song

et al. 2021

PLoS ONE

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“…SAH220, although containing a lower BET SSA contain active binding sites due to the surface functionality, allowing for a higher Q max than SAH180. This switch in adsorption dominance shows evidence of chemical interactions due to high amount of oxygen containing functional groups as another adsorption mechanism [ 80 , 81 ].However, comparing SAH260 with SAH220 the great difference in BET SSA resulted in higher surface area being the driving influence for Q max rather than surface functionality.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Loblolly Pine-Derived Superactivated Hydrochar: Effect of Hydrothermal Carbonization on Hydrogen and Electron Storage with Carbon Dioxide and Dye Removal

et al. 2022

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Pore modulation via hydrothermal carbonization (HTC) needs investigation due to its crucial effect on surface that influences its multirole utilization of such ultraporous sorbents in applications of energy storage- hydrogen and capacitive- as well as for pollutant abatement- carbon capture and dye removal. Hence, loblolly pine was hydrothermally carbonized followed by KOH activation to synthesize superactivated hydrochars (SAH). The resulting SAHs had specific surface area (SSA) 1462–1703 m2/g, total pore (TPV) and micropore volume (MPV) of 0.62–0.78 cm3/g and 0.33–0.49 cm3/g, respectively. The SAHs exhibit excellent multifunctional performance with remarkably high atmospheric CO2 capture of 145.2 mg/g and high pressure cryogenic H2 storage of 54.9 mg/g. The fabricated supercapacitor displayed substantial specific capacitance value of maximum 47.2 Fg−1 at 1 A g−1 in 6 M KOH and highest MB dye removal of 719.4 mg/g. Higher HTC temperature resulted in increased surface porosity as higher SSA, TPV benefitted H2 storage and MB dye removal while superior MPV favored CO2 capture. Moderate HTC temperature ensured higher mesopore-to-macropore volume ratio favoring electrochemical performance. Isotherm modelling of the adsorbates was compared using models: Langmuir, Freundlich, Langmuir- Freundlich and Temkin.

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“…The value of ∆ G ° becomes more negative with increasing temperature, indicating that the reaction tend towards favorability with increase in temperature. The positive standard enthalphy change (Δ H °) values indicate that the adsorption process was endothermic in nature [ 51 ]. The positive standard entropy change (Δ S °) values indicate the increase in randomness at the solid–liquid interface during the adsorption of Cr(VI) ions on Cs, Cs–Si, and Cs–Si–Hap.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study on Hexavalent Chromium Adsorption onto Chitosan and Chitosan-Based Composites

et al. 2021

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Chitosan (Cs)-based composites were developed by incorporating silica (Cs–Si), and both silica and hydroxyapatite (Cs–Si–Hap), comparatively tested to sequester hexavalent (Cr(VI)) ions from water. XRD and FT-IR data affirmed the formation of Cs–Si and Cs–Si–Hap composite. Morphological images exhibits homogeneous Cs–Si surface, decorated with SiO2 nanoparticles, while the Cs–Si–Hap surface was non-homogeneous with microstructures, having SiO2 and Hap nanoparticles. Thermal analysis data revealed excellent thermal stability of the developed composites. Significant influence of pH, adsorbent dose, contact time, temperature, and coexisting anions on Cr(VI) adsorption onto composites was observed. Maximum Cr(VI) uptakes on Cs and developed composites were observed at pH 3. The equilibration time for Cr(VI) adsorption on Cs–Si–Hap was 10 min, comparatively better than Cs and Cs–Si. The adsorption data was fitted to pseudo-second-order kinetic and Langmuir isotherm models with respective maximum monolayer adsorption capacities (qm) of 55.5, 64.4, and 212.8 mg/g for Cs, Cs–Si, and Cs–Si–Hap. Regeneration studies showed that composites could be used for three consecutive cycles without losing their adsorption potential.

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Upcycling olive oil cake through wet torrefaction to produce hydrochar for water decontamination

Cited by 32 publications

References 58 publications

Biochars derived from bamboo and rice straw for sorption of basic red dyes

Biochars derived from bamboo and rice straw for sorption of basic red dyes

Multifunctional Loblolly Pine-Derived Superactivated Hydrochar: Effect of Hydrothermal Carbonization on Hydrogen and Electron Storage with Carbon Dioxide and Dye Removal

A Comparative Study on Hexavalent Chromium Adsorption onto Chitosan and Chitosan-Based Composites

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