Temperature influence on layered double hydroxide tailored corncob biochar and its application for fluoride removal in aqueous media

Hettithanthri, Oshadi; Rajapaksha, Anushka Upamali; Nanayakkara, Nadeeshani; Vithanage, Meththika

doi:10.1016/j.envpol.2023.121054

Cited by 18 publications

(9 citation statements)

References 40 publications

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“…. .F hydrogen bonds [45][46][47]. In addition, the FTIR spectrum showed that the CaSO 4 -related absorption peak was weakened, and a new peak associated with the Ca-F bond appeared at 450 cm −1 after fluoride adsorption [48].…”

Section: Ftirmentioning

confidence: 97%

“…After the fluoride adsorption, the characteristic peak of −OH became weak and distorted, which was due to the ion exchange between OH − and F − [43,44]. Also, a slight shift in the hydroxyl peak was observed with adsorption, suggesting the possible formation of OH…F hydrogen bonds [45][46][47]. In addition, the FTIR spectrum showed that the CaSO4-related absorption peak was weakened, and a new peak associated…”

Section: Ftirmentioning

confidence: 99%

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Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Liu,

Zhang,

Mou

2023

Molecules

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In this study, vinasse shell biochar (VS) was easily modified with phosphogypsum to produce a low-cost and novel adsorbent (MVS) with excellent fluoride adsorption performance. The physicochemical features of the fabricated materials were studied in detail using SEM, EDS, BET, XRD, FTIR, and XPS techniques. The adsorption experiments demonstrated that the adsorption capacity of fluoride by MVS was greatly enhanced compared with VS, and the adsorption capacity increased with the pyrolysis temperature, dosage, and contact time. In comparison to chloride and nitrate ions, sulfate ions significantly affected adsorption capacity. The fluoride adsorption capacity increased first and then decreased with increasing pH in the range of 3–12. The fluoride adsorption could be perfectly fitted to the pseudo-second-order model. Adsorption isotherms matched Freundlich and Sips isotherm models well, giving 290.9 mg/g as the maximum adsorption capacity. Additionally, a thermodynamic analysis was indicative of spontaneous and endothermic processes. Based on characterization and experiment results, the plausible mechanism of fluoride adsorption onto MVS was proposed, mainly including electrostatic interactions, ion exchange, precipitation, and hydrogen bonds. This study showed that MVS could be used for the highly efficient removal of fluoride and was compatible with practical applications.

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Section: Ftirmentioning

confidence: 97%

Section: Ftirmentioning

confidence: 99%

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Liu,

Zhang,

Mou

2023

Molecules

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“…The BB-C2 sample has a less rough or cracked outside surface, as seen in Figures 11(a) and 11(a-1), due to less fluctuation of temperature while slow low heating rates occurred (Ong et al, 2021;Zhang et al, 2020) during the pyrolysis process of the stove, and heat is likely to transfer through the longitudinal direction rather than in the radius direction of bamboo wood chunks (Kalderis et al, 2023;Pinisakul et al, 2023). However, increasing pyrolysis temperature results in improved total surface and pore volumes of biochar (Binh et al, 2022;Hettithanthri et al, 2023;Faraji et al, 2023), but a thinner wall of the pore was found due to the decomposition of hemicellulose, cellulose, and lignin with increased temperature (Figures 11b and 11b-1). The distribution of porosity is larger than 50 nm, which implies that pore size is in the macropore , which relates to an increase in the calcination temperature of the NCCS case.…”

Section: The Surface Morphologies and Chemical Compositionmentioning

confidence: 98%

Effect of the non-uniform combustion core shape on the biochar production characteristics of the household biomass gasifier stove

Chaiyalap,

Chai-ngam,

Saengprajak

et al. 2023

Int. J. Renew. Energy Dev.

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The global demand for biochar in agricultural and carbon sequestration applications is increasing; nevertheless, biochar production using the 50-liter household biomass gasifier stove (50L-HBGS) in Thailand found major issues that need to be improved. The objective of this study was to study the effects of the airflow in the non-uniform combustion core shape (NCCS) on the biochar production characteristic of the 50L-HBGS. The new design of the NCCS was constructed and studied to replace the existing combustion core shape (ECCS) at Mahasarakham University. The height, air inlet, and air outlet diameters of the NCCS were designed at 45, 24, and 11.4 cm, respectively. The NCCS with 21 holes of the pyrolysis gas outlet, a diameter of 4 mm for each, was integrated into the 50L-HBGS and performed comparative tests to the ECCS using 9 kg of bamboo wood chunks in three consecutive experiments. The airflow and the combustion behavior were studied through the stove temperature profiles, which were recorded every 5 minutes using a digital data logger. The biochar products were studied using the scanning electron microscope (SEM) with the energy dispersive x-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and the proximate analysis technique. The study indicated that the 50L-HBGS with the NCCS made significantly improved the airflow rates in the combustion core, resulting in better continuous burning during the ignition state than with the ECCS. Moreover, the pyrolysis temperatures were significantly improved, it was provided temperatures during the pyrolysis process reached higher than 500 oC, resulting in the liquid tar being removed and no unburned wood chunks remaining at the end. The characterization result demonstrated that the 50L-HBGS with the NCCS had created biochar within a range of micropore and macrospore sizes and high fixed carbon content, which could be advantageously used for different agricultural and carbon sequestration applications.

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“…5(a)). 45 At lower pH, the adsorbent's Ni(OH) 2 @hBN surface is protonated with a positive charge, whereas at higher pH, it is deprotonated with a negative charge. As a result of the presence of the protonated site in the acidic medium, the anion adsorption was increased.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Functional hBN decorated Ni(OH)₂ nanosheets synthesized for remarkable adsorption performance for the elimination of fluoride ions

Choudhary¹,

Singh²,

Giri³

et al. 2023

Dalton Trans.

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Temperature influence on layered double hydroxide tailored corncob biochar and its application for fluoride removal in aqueous media

Cited by 18 publications

References 40 publications

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Effect of the non-uniform combustion core shape on the biochar production characteristics of the household biomass gasifier stove

Functional hBN decorated Ni(OH)₂ nanosheets synthesized for remarkable adsorption performance for the elimination of fluoride ions

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Temperature influence on layered double hydroxide tailored corncob biochar and its application for fluoride removal in aqueous media

Cited by 18 publications

References 40 publications

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Effect of the non-uniform combustion core shape on the biochar production characteristics of the household biomass gasifier stove

Functional hBN decorated Ni(OH)2 nanosheets synthesized for remarkable adsorption performance for the elimination of fluoride ions

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Product

Resources

About

Functional hBN decorated Ni(OH)₂ nanosheets synthesized for remarkable adsorption performance for the elimination of fluoride ions