Lignin is currently an underutilized part of biomass; thus, further research into lignin could benefit both scientific and commercial endeavors. The present study investigated the potential of kraft lignin as a support material for the removal of hydrogen sulfide (H2S) from gaseous streams, such as biogas. The removal of H2S was enabled by copper ions that were previously adsorbed on kraft lignin. Copper adsorption was based on two different strategies: either directly on lignin particles or by precipitating lignin from a solution in the presence of copper. The H2S concentration after the adsorption column was studied using proton-transfer-reaction mass spectrometry, while the mechanisms involved in the H2S adsorption were studied with X-ray photoelectron spectroscopy. It was determined that elemental sulfur was obtained during the H2S adsorption in the presence of kraft lignin and the differences relative to the adsorption on porous silica as a control are discussed. For kraft lignin, only a relatively low removal capacity of 2 mg of H2S per gram was identified, but certain possibilities to increase the removal capacity are discussed.

中文翻译：

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铜在木质素上的吸附去除硫化氢


木质素目前是生物质中未充分利用的部分；因此，对木质素的进一步研究可以使科学和商业活动受益。本研究调查了牛皮纸木质素作为支撑材料从沼气等气流中去除硫化氢 (H2S) 的潜力。 H2S 的去除是通过先前吸附在牛皮纸木质素上的铜离子实现的。铜吸附基于两种不同的策略：直接吸附在木质素颗粒上或通过在铜存在的情况下从溶液中沉淀木质素。利用质子转移反应质谱法研究了吸附柱后的H2S浓度，并利用X射线光电子能谱研究了H2S吸附的机理。确定了在牛皮纸木质素存在下 H2S 吸附过程中获得了元素硫，并讨论了相对于作为对照的多孔二氧化硅上的吸附的差异。对于牛皮纸木质素，仅确定了每克 2 毫克 H2S 的相对较低去除能力，但讨论了提高去除能力的某些可能性。