In this work, lignin carbon-based membranes were prepared for H2S adsorption. Alkali lignin was carbonized to obtain alkali lignocarbon (CLA). Using the CLA and polyvinyl alcohol (PVA) as raw materials, glycerol and water as plasticizers, and nano-CuO and Cu2+ as dopants, CLA/PVA, CuO-CLA/PVA-1, and Cu-CLA/PVA-2 composite membranes were prepared by solution casting method. The structures of these membranes and their H2S adsorption properties were then analyzed. The results show that with a membrane solution water-alcohol ratio of 3 : 1 and 2 wt% CLA content, the prepared CLA/PVA membrane can adsorb H2S for 30 min. The CuO-CLA/PVA-1 and Cu- CLA/PVA-2 membranes, which were obtained after doping with nano-CuO and Cu2+, demonstrate significantly improved deodorization performance compared with that of CLA/PVA. The Cu-CLA/PVA-2 membrane can adsorb H2S for up to 75min and also demonstrates better mechanical properties. The H2S adsorption capacity of this membrane is up to 0.27 mol/kg. Structural analysis shows that the veneers of the three composite membranes are smooth and that doped copper is evenly distributed in the membranes as nano-CuO. The surface functional groups of the CLA/PVA, CuO-CLA/PVA-1, and Cu-CLA/PVA-2 membranes are similar and play a positive role in H2S adsorption. Nano-CuO is the main active site for H2S adsorption in the Cu-containing composite membranes.
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