Department of Engineering, Aarhus University, Hangøvej 2, 8200 Aarhus, Denmark.
Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark.
Molecules. 2020 Nov 27;25(23):5577. doi: 10.3390/molecules25235577.
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 (HS) from gaseous streams, such as biogas. The removal of HS 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 HS concentration after the adsorption column was studied using proton-transfer-reaction mass spectrometry, while the mechanisms involved in the HS adsorption were studied with X-ray photoelectron spectroscopy. It was determined that elemental sulfur was obtained during the HS 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 HS per gram was identified, but certain possibilities to increase the removal capacity are discussed.
木质素目前是生物质中未得到充分利用的部分；因此，对木质素的进一步研究可能有益于科学和商业领域。本研究探讨了 kraft 木质素作为一种支持材料，用于从沼气等气体流中去除硫化氢 (HS) 的潜力。HS 的去除是通过先前吸附在 kraft 木质素上的铜离子实现的。铜的吸附基于两种不同的策略：要么直接在木质素颗粒上，要么在存在铜的情况下从溶液中沉淀木质素。使用质子转移反应质谱法研究了吸附柱后的 HS 浓度，同时使用 X 射线光电子能谱法研究了 HS 吸附涉及的机制。结果表明，在 kraft 木质素存在的情况下，HS 的吸附过程中得到了元素硫，并且讨论了相对于多孔硅作为对照的吸附的差异。对于 kraft 木质素，仅确定了相对较低的每克 2 毫克的 HS 去除能力，但讨论了增加去除能力的某些可能性。
