Removal of siloxane (L2) from biogas using methyl-functionalised silica gel as adsorbent

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

“…The shapes of the gas adsorption isotherms for rGOAs were consistent with IUPAC type V curves with a type H3 hysteresis loop [ 8 , 33 ]. The shapes of N 2 adsorption-desorption isotherms were slightly increased at low relative pressures ( P / P 0 < 0.4) and sharply increased at high relative pressure (0.93 < P / P 0 < 1.0), indicating the coexistence of slotted mesopores and macropores [ 16 , 34 ]. Compared with rGOAs, IGGO had a significantly smaller N 2 adsorption volume and exhibited a type III isotherm, reflecting its relatively non-porous/macroporous structure [ 35 ].…”

“…Table 1 shows that D aver was reduced while S BET and V micro both increased with increasing hydrothermal temperature. This monotonic behavior was not observed for V tot , which reached a maximum value of 0.45 cm 3 ·g −1 for rGOA-140, indicating that the 3D macroscopic assemblies of rGOA had a mesoporous/macroporous texture [ 16 , 22 ].…”

“…Materials currently used to reduce siloxanes in biogas include high efficiency adsorbents such as activated carbon, silica and molecular sieves [ 5 , 11 , 12 , 13 ]. While these adsorbents are relatively low cost, simple to use [ 14 , 15 , 16 ] and high in adsorption capacity, their adsorption cycle performances are limited, restricting their practical applications. Previously, we developed a modified silica gel siloxane adsorbent with good recyclability and found that its adsorption performance was affected by its textural properties, such as the specific surface area ( S BET ), total pore volume ( V tot ), micropore volume ( V micro ) and contact angle [ 16 , 17 , 18 ].…”

“…While these adsorbents are relatively low cost, simple to use [ 14 , 15 , 16 ] and high in adsorption capacity, their adsorption cycle performances are limited, restricting their practical applications. Previously, we developed a modified silica gel siloxane adsorbent with good recyclability and found that its adsorption performance was affected by its textural properties, such as the specific surface area ( S BET ), total pore volume ( V tot ), micropore volume ( V micro ) and contact angle [ 16 , 17 , 18 ]. Reduced graphene oxide aerogels (rGOAs) have good textural properties and strong hydrophobicity [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ], although their application to biogas siloxane removal has not been reported.…”

Porous Materials for Applications in Energy and Environment

“…On the other hand, numerous years of research have been dedicated to the development and improvement materials and their properties, in order to help alternative energies to become more efficient [14][15][16][17][18][19]. Therefore, materials with excellent properties are required to help remedy and/or reduce environmental pollution and power generation [20][21][22]. Among the different types, "porous materials" have received great attention in recent decades, due to their applications in the science of biomaterials [23][24][25][26][27], catalysis [28], sound adsorption [29], environment [30,31], and energy conversion [32].…”