Comparison of H<sub>2</sub>S adsorption by two hydrogel composite (HBC) derived by Empty Fruit Bunch (EFB) biochar and Coal Fly Ash (CFA)

Meri, N. H.; Alias, Azil Bahari; Talib, Norhayati; Rashid, Zulkifli Abdul; Ghani, Wan Azlina Wan Ab Karim

doi:10.1088/1757-899x/334/1/012038

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…For example, Han et al (2020) indicated that a higher gas velocity led to a reduced contact time that decreased the H 2 S removal of biochar derived from rice husk. In contrast, increasing the adsorption bed height would benefit the H 2 S removal due to the prolonged contact time (Meri et al 2018;Papurello et al 2020;Sawalha et al 2020). However, the resistance to the flow also would become higher (i.e., higher head loss or pressure drop) because of the strong mechanical energy dissipation (Scheufele et al 2021).…”

Section: Items Valuesmentioning

confidence: 99%

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Huang

Wang

Bai

et al. 2022

Biochar

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Hydrogen sulfide (H2S) removal has been a significant concern in various industries. In this study, food waste digestate-derived biochar (DFW-BC), a by-product of food waste treatment with abundant minerals, was assessed for removing H2S from different simulated biogas containing oxygen (O2) and carbon dioxide (CO2) and under different moisture (H2O) contents (0% and 20%) of biochar. The influencing mechanisms of the gas conditions combined with the moisture contents were also investigated. The results showed an H2S removal of 1.75 mg g−1 for dry biochar under pure H2S, 4.29 mg g−1 for dry biochar under H2S + O2, 5.29 mg g−1 for humid biochar under H2S, and 12.50 mg g−1 for humid biochar under H2S + O2. For dry DFW-BC, the high Fe content was responsible for the O2 enhancement. In contrast, O2 + H2O activated the catalytic H2S oxidation of the less reactive minerals (mainly Ca). The inhibition of CO2 on H2S adsorption was not obvious for dry DFW-BC; the specific pore structure may have provided a buffer against the physisorption competition of CO2. However, when H2O was present on DFW-BC, the changes in critical biochar properties and sulfur speciation as opposed to that without H2O implied an evident occurrence of CO2 chemisorption. This CO2 chemisorption partially hindered O2 + H2O enhancement, decreasing the H2S removal capacity from 12.50 to 8.88 mg g−1. The negative effect was ascribed to mineral carbonation of CO2, neutralizing the alkaline surface and immobilizing metal oxides, which thus reduced the acceleration in H2S dissociation and activation in catalytic H2S oxidation by O2 + H2O. Graphical Abstract

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Section: Items Valuesmentioning

confidence: 99%

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Huang

Wang

Bai

et al. 2022

Biochar

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“…To improve the adsorption efficiency, the biochar was then modified to hydrogel biochar by adding acrylamide (AAm) as a monomer [3]. The hydrogel biochar is made from the pyrolysis process, which used a raw empty fruit bunch (EFB).…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Simulation Hydrogen Sulphide Gas Adsorption By Using Hydrogel Biochar

et al. 2021

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Monte Carlo simulation is popular in engineering because it is a flexible simulation. It can reduce the uncertainty of the possibilities, and it can run a large number of cycles that are suitable for studying the kinetics and mechanism of adsorption, leading to better data accuracy than practical results. This simulation is chosen to investigate the phenomena of H2S gas adsorption in hydrogel biochar. Hydrogel biochar adsorbent is made from highly available biomass sources by using the pyrolysis process. There are two parameters studied: the effect of the flow rate of H2S gas and adsorbent bed height. This parameter can show the efficiency of the adsorption process. From this research, the kinetic model that suitable for this H2S gas adsorption is by First-Pseudo Kinetic model based on the correlation coefficient R 2 values generated from the MATLAB program is between 0.7 to 0.9. Thus, physical adsorption is the best way to describe the adsorption in hydrogel biochar in which the uniform energies of adsorption on the surface of biochar and no shifting of adsorbate in the plane of surfaces. It can be concluded that at the optimize condition used Langmuir's isotherm where the maximum amount of adsorption capacity is obtained, and the adsorption process occurs at monolayer of adsorbent with an equivalent adsorption site.

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“…Several studies have reported utilizations of EFB as adsorbent in the context of gaseous pollutants adsorption. For instance, Meri et. al.…”

Section: Introductionmentioning

confidence: 99%

Nitric oxide removal by zinc chloride activated oil palm empty fruit bunch fibre

Lin¹,

Ibrahim²,

Ahmad³

et al. 2021

Mal. J. Fund. Appl. Sci.

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Nitric oxide (NO) emission is known to pose detrimental effects towards the environment and human beings. Low-temperature NO removal by activated carbon from agricultural waste materials is affordable due to the use of low-cost materials as precursor and elimination of the need for flue gas reheating. The use of chemical agents in activated carbon production improves the performance of waste materials in NO removal. The performance of NO removal was investigated via breakthrough experiment using oil palm empty fruit bunch (EFB) activated with zinc chloride (ZnCl2) at different concentrations (0.1, 0.5, and 1.5 M). Activation of EFB with 0.5 M ZnCl2 resulted in the formation of well-defined micropores, but the use of higher concentration of ZnCl2 resulted in widening of developed pores and intense pore blockage which reduce the accessibility of NO molecules to the adsorption sites. An adsorption isotherm study conducted using 0.5 M ZnCl2/EFB sample with varying NO concentration between 300-1000 ppm indicated that the adsorption process was best defined by Langmuir isotherm model. In addition, adsorption kinetic was investigated at different temperatures; i.e. 100, 150, 200, 250 and 300 °C. NO removal was found to follow Avrami kinetic model at T=100 °C, while upon further increase in temperature, the process was better fitted to the pseudo-second order kinetic model. NO adsorption capacity increases significantly beyond 250 °C up to 1000 mg/g. The activation energy of NO adsorption fell into two distinct regions: -4.73 kJ/mol at 100-200 °C and 84.04 kJ/mol at 200-300 °C. At lower temperature, the adsorption process was exothermic and followed physisorption path, while the increase in reaction temperature led to slower rate of reaction. It was concluded that the removal of NO using EFB modified with ZnCl2 at optimized condition could be a promising alternatives for treating NO-containing flue gas.

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Comparison of H₂S adsorption by two hydrogel composite (HBC) derived by Empty Fruit Bunch (EFB) biochar and Coal Fly Ash (CFA)

Cited by 8 publications

References 4 publications

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Monte Carlo Simulation Hydrogen Sulphide Gas Adsorption By Using Hydrogel Biochar

Nitric oxide removal by zinc chloride activated oil palm empty fruit bunch fibre

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Comparison of H2S adsorption by two hydrogel composite (HBC) derived by Empty Fruit Bunch (EFB) biochar and Coal Fly Ash (CFA)

Cited by 8 publications

References 4 publications

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Monte Carlo Simulation Hydrogen Sulphide Gas Adsorption By Using Hydrogel Biochar

Nitric oxide removal by zinc chloride activated oil palm empty fruit bunch fibre

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Product

Resources

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Comparison of H₂S adsorption by two hydrogel composite (HBC) derived by Empty Fruit Bunch (EFB) biochar and Coal Fly Ash (CFA)