Porous reduced-graphene oxide supported hollow titania (rGO/TiO2) as an effective catalyst for upgrading electromethanogenesis

Optimum Magnetite–Zeolite Nanoparticles Loading on the Cathode of Microbial Electrochemical–Anaerobic Digestion System for Enhancing Methane Generation

“…The overall methane recovery (), which indicates the actual methane production compared to the theoretical methane production, was increased from 93.34 0.43% in control MES to 108.49 2.70% MES with 1 mg cm −2 MZ‐loaded cathode. In some earlier studies using similar reactor configurations and applied voltage (0.8 V), the of 109.4% in MES with1 mg cm −2 rGO/TiO 2 ‐loaded cathode, [ 16 ] 108.5% in MES with 1 mg cm −2 MZ on cathode, [ 23 ] and 105.7% in MES using Fe 3 O 4 conductive nanoparticles in suspension was achieved. [ 55 ] Likewise, Flores‐Rodriguez et al recorded an enhanced of ≈100% in MES using an imposed potential of 1.0 V (absolute voltage), [ 30 ] whereas almost 80% could be obtained from an MES using autoclave pretreated sludge as substrate at the same applied voltage.…”

“…For example, an average of −0.48 V (vs Ag/AgCl) was noted in an MES using magnetite zeolite at 1 mg cm −2 [ 23 ] and −1.17 V (vs Ag/AgCl) in MES operations with reduced graphene oxide (rGO)/Titanium dioxide (TiO 2 ) catalyst, suggesting that both direct and mediated electron‐transfer processes were involved for methane production. [ 16 ]…”

“…[14] Consequently, researchers predominantly concentrate on enhancing the cathodic current uptake by improving the catalytic properties of the cathode using catalytic materials. In some recent studies, electron exchange between electrode and microbe was enhanced cathode modified with conductive materials such as carbon nanotube, [15] graphene, [16] and metal oxides. [17,18] Tian et al proposed that the coenzyme F420 relevant to the methanogenesis was improved in the presence of the conductive additives on the cathode, and thus enhanced methane production was achieved.…”

Interface properties of hydroxyapatite in ternary composites cathodes for electromethanogenesis

“…Qiu et al 36 demonstrated that employing Sn-modified carbon felt improves acetate yield by catalyzing formate production, serving as an electron donor for CO 2 reduction. Thi Vu et al 37,38 have successfully exploited the synergistic effects deriving from composite materials: in particular, a cost-effective magnetite/zeolite nanocomposite demonstrated to boost methane production rate (0.238 L L −1 d −1 ). 38…”

“…37,38 have successfully exploited the synergistic effects deriving from composite materials: in particular, a cost-effective magnetite/zeolite nanocomposite demonstrated to boost methane production rate (0.238 L L À1 d À1…”