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Examines selective acidic gas removal in biogas, suggesting an efficient purification method.
Biogas purification is essential for mitigating corrosion and environmental risks associated with acidic impurity gases. In this study, yeast–alginate hydrogel composite biosorbents prepared by Ca²⁺ gelation followed by Fe³⁺ secondary crosslinking were investigated for selective acidic-gas removal in a fixed-bed column system. Response surface methodology (RSM) was employed to optimize key operating parameters governing the biosorption process. The Fe³⁺-crosslinked yeast–alginate composites exhibited markedly enhanced removal of H2S and CO2 compared with non-Fe³⁺ controls, while CH4 loss remained consistently below 5%, indicating preferential removal of acidic gases over methane. Structural and physicochemical characterizations confirmed the formation of a stable mesoporous network with effective Fe³⁺ incorporation, and biological assays demonstrated preserved yeast viability after adsorption. Overall, these results highlight the potential of Fe³⁺-crosslinked yeast–alginate composite biosorbents as a selective and sustainable material for biogas purification and provide a foundation for further evaluation under continuous-flow conditions.
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Wang et al. (2026) studied this question.
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