Hydrogen Sulfide Adsorption Capability of Biochar Produced from Residual Biomass
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Abstract
This study aimed to investigate the adsorption capacity of hydrogen sulfide (H2S) by biochar prepared from agricultural waste. The biochar samples include carbonized corn cob (C), carbonized corn cob under CO2 rich atmospheres (CA), carbonized coconut shell (CO), carbonized coconut shell under CO2 rich atmospheres (COA), carbonized woodchips (B) and carbonized woodchips under CO2 rich atmospheres (BA). All samples were carbonized at the controlled temperature (500 ± 10 °C). H2S adsorption capability were evaluated in a continuous manner using actual biogas produced from ethanol waste with controlled H2S loading rates of 4,300 ± 20 g/m3-h. The experimental measurement of the H2S adsorption capacity of C, CO, and B were 2.33 ± 0.09, 3.66 ± 0.63, and 5.56 ± 0.77 g H2S/g Adsorbent material, respectively. The adsorption capacity of CA, COA, and BA were 1.58 ± 0.90, 1.84 ± 0.75, and 1.26 ± 0.20 g H2S/g Adsorbent material. It is thus clear that carbonized woodchip (B) has significantly higher adsorption capacity than carbonized corn cob (C) and coconut shell (CO). Concisely, carbonization under CO2 rich atmosphere cannot enhance adsorption capacity; instead it induces negative effects in most cases.
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