Volatile methyl siloxanes (VMS), which are considered to be the most troublesome impurities in current biogas-cleaning technologies, need to be removed. In this study, we fabricated a series of FeO-urea-modified reduced graphene-oxide aerogels (FeO-urea-rGOAs) by using industrial-grade graphene oxide as the raw material. A fixed-bed dynamic adsorption setup was built, and the adsorption properties of the FeO-urea-rGOAs for hexamethyldisiloxane (L2, as a VMS model pollutant) were studied. The properties of the as-prepared samples were investigated by employing various characterization techniques (SEM, TEM, FTIR, XRD, Raman spectroscopy, and N adsorption/desorption techniques). The results showed that the FeO-urea-rGOA-0.4 had a high specific surface area (188 m g), large porous texture (0.77 cm g), and the theoretical maximum adsorption capacity for L2 (146.5 mg g). The adsorption capacity considerably increased with a decrease in the bed temperature of the adsorbents, as well as with an increase in the inlet concentration of L2. More importantly, the spent FeO-urea-rGOA adsorbent could be readily regenerated and showed an excellent adsorption performance. Thus, the proposed FeO-urea-rGOAs are promising adsorbents for removing the VMS in biogas.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10535819 | PMC |
| http://dx.doi.org/10.3390/molecules28186622 | DOI Listing |
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