Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment

Covarrubias-García, Itzel; Quijano, Guillermo; Aizpuru, Aïtor; Sánchez-García, José-Luis; Rodríguez-López, José Luis; Arriaga, Sonia

doi:10.1016/j.jhazmat.2020.122760

Cited by 18 publications

(7 citation statements)

References 63 publications

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“…6) illustrate the relationship between input variables interactions and the response variables (SOG and Phenol removal). The curvatures of the 3D plots clearly show the desirable condition peaks shifted towards the higher catalyst dosage and reaction time 45,61 . Which signifies increasing the catalyst dosage more hydroxyl radicals are produced to enhance the degradation 46,53 .…”

Section: Resultsmentioning

confidence: 97%

Photocatalytic degradation of oily waste and phenol from a local South Africa oil refinery wastewater using response methodology

Tetteh

Rathilal

Naidoo

2020

Sci Rep

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The photocatalytic degradation of a local South Africa oil refinery wastewater was conducted under UV radiation using an aqueous catalyst of titanium dioxide (TiO2), Degussa P25 (80% anatase, 20% rutile) in suspension. the experiment was carried out in a batch aerated photocatalytic reactor based on a central composite design (CCD) and analyzed using response surface methodology (RSM). The effects of three operational variables viz. TiO 2 dosage (2-8 g/L), runtime (30-90 minutes), and airflow rate (0.768-1.48 L/min) were examined for the removal of phenol and soap oil and grease (SOG). The data derived from the CCD, and the successive analysis of variance (ANOVA) showed the TiO 2 dosage to be the most influential factor, while the other factors were also significant (P < 0.0001). Also, the ANOVA test revealed the second-order of tio 2 dosage and runtime as the main interaction factors on the removal efficiency. To maximize the pollutant removal, the optimum conditions were found at runtime of 90 minutes, TiO 2 dosage of 8 g/L, and an aeration flow rate of 1.225 L/min. Under the conditions stated, the percentage removal of phenol (300 ± 7) and SOG (4000 ± 23) were 76% and 88% respectively. At 95% confidence level, the predicted models developed results were in reasonable agreement with that of the experimental data, which confirms the adaptability of the models. The first-order kinetic constants were estimated as 0.136 min −1 and 0.083 min −1 for SOG and phenol respectively. Photocatalysis has attracted worldwide interest due to its potential to use solar energy not only to solve environmental problems but also to provide renewable and sustainable energy 1,2. However, the ever-increasing demand for good water quality and oil refinery products have become expensive commodities with major challenges, which requires thoughtful attention 3,4. Oily waste from petroleum refinery has aliphatic and phenolic compounds, are considerably carcinogenic and toxic to the ecosystem and human health, and therefore their removal from wastewater is of global concern 3,5,6. The tox,icity and extreme instability of oily waste make them not degradable easily, this pose a significant threat to the water bodies and soil 5-7. Meanwhile, the processing of crude oil consumes large volumes of water and generates about 0.4-1.6 times the amount of crude oil processed as oil refinery wastewater (ORW) 8-10. The discharge of ORW with adequate or no treatment, due to their inertness, endocrine-disrupting abilities, and carcinogenic behaviour could also affect water bodies and soil profile negatively 9-11. Therefore, there is the need to develop sustainable and eco-effective methods to mitigate the oily pollutants from the ORW, to produce clean water and a sustainable environment 12. In this case, the photocatalysis technology was considered. Unfortunately, the production of polluted wastewater (ORW) is based on the raw crude oil type, plant configuration, and operational procedure, which varies in physicochemical parameters as compared to urban wa...

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Section: Resultsmentioning

confidence: 97%

Photocatalytic degradation of oily waste and phenol from a local South Africa oil refinery wastewater using response methodology

Tetteh

Rathilal

Naidoo

2020

Sci Rep

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“…The mixture was washed with deionized water to adjust the pH (neutral) for further purification. Graphite oxide was dried at 60 °C …”

Section: Materials and Methodsmentioning

confidence: 99%

“…Graphite oxide was dried at 60 °C. 33 Following the synthesis of GO, the reduction step to obtain RGO was performed. To achieve that, the prepared GO was dispersed in distilled water (200 mg/100 mL) and placed in an ultrasonic bath (ultrasonic cleaning bath, Spain) for 2.0 h to acquire exfoliated graphene oxide.…”

Section: Feedstock and Inoculummentioning

confidence: 99%

Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

et al. 2022

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The synergistic impact of Tween 80 (T80) and reduced graphene oxide (RGO) on the codigestion process of food waste and biscuit wastewater via an anaerobic sequential batch reactor was investigated in this study. The T80/RGO-amended reactor exhibited a hydrogen yield of 313.2 ± 89.3 mL/gCODinitial, which is 1.98-fold higher than that of the control. This increase was a consequence of the increase of hydrogenase enzyme activity from 0.24 ± 0.11 to 0.46 ± 0.15 mg MBreduced/min, as well as the stimulation of hydrolytic enzyme activities (i.e., α-amylase, xylanase, CM-cellulase, polygalacturonase, protease, and lipase). Likewise, microbial community analysis revealed that the relative abundances of genera Acinetobacter, Syntrophomonas, and Clostridium (H2-producing species) were enhanced from 3.9, 2.3, and 2.8% to 10.8, 9.1, and 3.6%, respectively, when T80/RGO was supplemented. On the other hand, molecular docking analysis was performed to explore the interaction of the hydrogenase protein with RGO (binding score: −10.1 kcal/mol) and T80 (binding score: −4.1 kcal/mol) as possible targets with active site residues. Eventually, supplementation of the T80/RGO mixture could stimulate the efficiency of the fermentative hydrogen process and, consequently, be used in practical engineering applications.

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“…Briefly, both rates are gained as a function of the gas pressure and temperature, following Eqs. (7) and ( 9), respectively. The equilibrium situation is reached when both rates become equal (i.e., 𝑟 !…”

Section: Kinetic Phase Diagramsmentioning

confidence: 99%

“…For instance, promising results have been achieved in studies on graphene nanostructures 6 and reduced graphene oxides. 7 Another carbon allotrope that has shown good results are graphynes, 8 2D carbon-based structures with C atoms displaying sp and sp 2 hybridizations, e.g., displaying C sp 2 nodes linked together by acetylenic bonds between them, this is, through C atoms with sp hybridization. Some theoretical studies on graphynes pointed out their superior charge transportation compared to graphene, 9,10 and proposed synthetic routes to achieve them.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic, kinetic and dynamic aspects of biogas upgrading using nano-engineered grazynes

Solana

Escrig

Belmonte

2022

Preprint

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Different nano-engineered grazynes have been studied as possible membranes to separate methane (CH4) from carbon dioxide (CO2) by computational simulations based on density functional theory (DFT) and molecular dynamics (MD). The study focuses on the thermodynamics, kinetics, and dynamical aspects associated to the diffusion rates and selectivities in the context of biogas upgrading. Small adsorption energy values have been obtained for three semi-permeable grazynes, with low diffusion energy barriers below 1 eV and getting lower values as the grazyne pore increases. Selectivity estimates are found to decrease with temperature with [1],[1,2]{0,1}-grazyne obtaining the highest CO2 selectivity over CH4 at room temperature, of ca. 17, while, for the rest of grazynes studied, the selectivity falls below 5. MD simulations reveal that selectivities can be larger, up to 39 at high pressures on [1],[2]{2}-grazyne, closely to the value obtained for [1],[2]{(00),2}-grazyne, suiting grazynes membranes for biogas upgrading.

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Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment

Cited by 18 publications

References 63 publications

Photocatalytic degradation of oily waste and phenol from a local South Africa oil refinery wastewater using response methodology

Photocatalytic degradation of oily waste and phenol from a local South Africa oil refinery wastewater using response methodology

Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

Thermodynamic, kinetic and dynamic aspects of biogas upgrading using nano-engineered grazynes

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