Modification of pineapple leaf fibers with aminosilanes as adsorbents for H2S removal

Discovering the Interference of Hydrogen Sulfide on Polyethylenimine-Functionalized Porous Resin for Biogas Upgrading via CO2 Adsorption

“…After all, as a toxic and corrosive acid gas, the associated H 2 S in biogas (50–5000 ppm) is another component besides CO 2 that can be reacted with amine groups. , The main reactions between CO 2 or H 2 S and amine groups under dry conditions are described in the following equations (eqs –). , Even if the desulfurization pretreatment can be applied before biogas upgrading, the residual trace sulfur-containing compound may cause cumulative degradation effects on amine-based materials during the long-term operation. Previous studies deal mostly with H 2 S removal from biogas using amine-functionalized materials as H 2 S adsorbents based on the above reactions, instead of exploring the effect of H 2 S impurity on downstream biogas upgrading. Okonkow et al and Chanka et al synthesized the modified silica and microcrystalline cellulose with different amine types to selectively remove H 2 S from biogas, respectively. , Instead, amine-functionalized materials have more obvious advantages in CO 2 capture and separation, which have received extensive attention as the CO 2 adsorbents rather than H 2 S adsorbents. Nevertheless, the impact of trace H 2 S, regarded as an acid impurity in biogas, on CO 2 adsorption and stability is barely investigated and must be evaluated .…”

“…6,32 The main reactions between CO 2 or H 2 S and amine groups under dry conditions are described in the following equations (eqs 1−5). 33,34 Even if the desulfurization pretreatment can be applied before biogas upgrading, the residual trace sulfur-containing compound may cause cumulative degradation effects on amine-based materials during the long-term operation.…”

“…Okonkow et al and Chanka et al synthesized the modified silica and microcrystalline cellulose with different amine types to selectively remove H 2 S from biogas, respectively. 34,35 Instead, amine-functionalized materials have more obvious advantages in CO 2 capture and separation, which have received extensive attention as the CO 2 adsorbents rather than H 2 S adsorbents. Nevertheless, the impact of trace H 2 S, regarded as an acid impurity in biogas, on CO 2 adsorption and stability is barely investigated and must be evaluated.…”

Design and Synthesis of Magnetic Immobilized Pineapple Cellulose/EDTA for Removal of Copper(II) and Zinc(II) by Coordination

“…The residue (2.8200 g) was refluxed in the solution of potassium hydroxide (65.0 mL, 5% w/v) at 100.0 °C for 1 h. The extracted cellulose was washed out with deionized water until neutral pH was obtained. The sample was dried at 60.0 °C for 5 h [18].…”

Anchoring carboxylated pineapple peel cellulose and EDTA onto magnetic (3-aminopropyl)triethoxysilane to effective diminish copper(II) and zinc(II) from polluted water

“…The residue (2.8200 g) was refluxed in the solution of potassium hydroxide (65.0 mL, 5% w/v) at 100.0 °C for 1 h. The extracted cellulose was washed out with deionized water until neutral pH was obtained. The sample was dried at 60.0 °C for 5 h (Chanka et al 2021).…”