Current Trends and Future Prospects of Nanotechnology in Biofuel Production
Abstract
:1. Introduction
2. Biofuel Types
3. Different Nanoparticles in Biofuel Production
3.1. Carbon Nanotubes (CNTs)
3.2. Magnetic Nanoparticles
3.3. Acid Functionalized Nanoparticles
3.4. Metallic Nanoparticles
3.5. Metal-Oxide Nanoparticles
4. Nanoparticles in Heterogeneous Catalysis
5. Applications
5.1. Biohydrogen Production
5.2. Effectiveness of Nanoparticles in Biogas Generation for Industrial Benefits
5.3. Bioethanol
5.4. Biodiesel
6. Current Challenges and Future Perspectives for Biofuel Production with the Implementation of Nanotechnology
7. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Nanoparticles | Substrate/ Feedstock | Reaction Conditions | Summary | Reference |
---|---|---|---|---|
Ag | Glucose | Mixed culture; pH–8.5; temperature–35 °C; rotation–120 rpm; | Higher hydrogen yield (2.48 mol/mol glucose) observed compared to blank. Reduction in lag phase observed with addition of Ag NPs. Reduction in ethanol production observed in presence of Ag NPs. | [86] |
Au | Acetate | Anaerobic sludge; pH–7.2; temperature–35 °C | The hydrogen production rate reached 105 2 mL/L per day with the addition of Ag NPs. | [87] |
Au | Artificial wastewater | Anaerobic culture; pH–7.2; temperature–35 °C | Maximum cumulative hydrogen production 4.48 mol per mol sucrose achieved with 5 nm Au NPs. The conversion efficiency of sucrose to hydrogen reached 56%. | [66] |
Cu | Glucose | Enterobacter cloacae 811101 and Clostridium acetobutylicum NCIM 2337; pH–7.0 (E. cloacae), 6.0 (C.acetobutylicum);temperature–37 °C;duration–24 h | The Cu-NPs were found to have a more inhibitory effect on biohydrogen production. Addition of Cu NPs in fermentative process showed higher inhibitory effect than the CuSO4 supplementation. Cu NPs with concentration less than 2.5 mg/L enhanced hydrogen production. | [88] |
Fe | Glucose | Anaerobic sludge, pH–5.5; temperature–37 °C | The hydrogen and biogas yield of the control test were 247 and 391 mL/g VS, respectively. Addition Ni2+ ions improved hydrogen production by 55%. | [89] |
Fe | Water hyacinth | Mixed culture and Clostridium butyricum TISTR, temperature–35 °C; duration–4 days | A maximum hydrogen yield 57mL/g of the plant biomass equal to 85.50% of the theoretical maximum is obtained. | [35] |
Fe | Glucose | Enterobacter cloacae DH–89, pH–7.0; temperature–37 °C | Supplementation of Fe NPs significantly improved the hydrogen yield. A maximum H2 yield 1.9 mol mol−1 glucose utilized was observed with addition of 100 mg/L FeNPs, which increases the glucose conversion by two-fold. | [51] |
Ni | Industrial wastewater | Anaerobic sludge; pH–7.0; temperature–55 °C; rotation–180 rpm | Ni-Gr NC dose of 60 mg/L exhibited the highest improvement (105%) in H2 production. H2 production was improved by 67% compared with supplementation of Ni nanoparticles. | [90] |
Iron oxide | Glucose | E. cloacae 811101; pH–7.0; temperature–37 °C; duration–24 h; | Maximum hydrogen yields 2.07 mol H2/mol glucose and 5.44 mol H2/mol sucrose were achieved with addition of 125 mg/L and 200 mg/L iron oxide NPs. Enhancement of hydrogen production was higher with addition of iron oxide NPs compared to ferrous iron supplementation. | [91] |
Fe2O3 | Glucose | Anaerobic sludge; pH–5.5; temperature–60 °C; rotation–150 rpm | Maximum hydrogen yield reached 1.92 mol H2/mol glucose with a hydrogen content of 51%. Metal NPs are not consumed by the microbes and only act as hydrogen production enhancer. | [52] |
Fe3O4 | Wastewater | Mixed culture; pH–6.0; temperature–37 °C; rotation–200 rpm | The maximum hydrogen production rate and specific hydrogen yield reached 80.7 mL/h and 44.28 mL H2/g COD with supplementation of NPs. Highest cumulative volume of hydrogen (380 mL), hydrogen content (62.14%) and % COD reduction (72.5) was obtained under the optimal conditions. | [53] |
Fe3O4 | Sugarcane bagasse | Anaerobic sludge; pH–5.0; temperature–30 °C | Addition of 200 mg/LFe2+ and magnetite NPs enhanced the HY by 62.1% and 69.6%, respectively. Highest hydrogenase gene activity was confirmed by immobilized cultures on magnetite nanoparticles. | [54] |
TiO2 | Malate | R. sphaeroides NMBL–02; pH–8.0; temperature–32 °C | Hydrogen production rate enhanced by 1.54 fold and duration by 1.88 fold in the presence of 60 mg/mL of TiO2 NPs in comparison to the control. Maximum hydrogen production 1900 mL/L with 63.27% malate conversion achieved. | [92] |
Nanoparticles | Substrate/Feedstock | Reaction Conditions | Summary | Reference |
---|---|---|---|---|
Ni | Manure slurry | Temperature–37 °C; rotation–20 rpm (in 1 min interval) | Addition of 2 mg/L Ni NPs enhanced the biogas production by 1.74 times in comparison to control. The methane volume increased by 2.01 times. Highest specific biogas (614.5 mL per g VS) and methane (361.6 mL per g VS) production were attained with 2 mg/L Ni NPs. | [94] |
Nano zero–valent iron (nZVI) | Waste activated sludge | Temperature–35 °C; rotation–120 rpm; duration–30 days | Addition of 10 mg/g total suspended solids (TSS)nZVI increased methane production to 120% of the control. Low concentrations of nZVI promoted a number of microbes (Bacteria and Archaea) and activities of key enzymes. | [55] |
nZVI | Sewage sludge | pH–7.0; temperature–37 °C; duration–30 days | Methane yield enhanced by 25.2% in the presence of nZVI. COD removal efficiency was 54.4% in presence of nZVI, higher compared to control (44.6%). The addition of nZVI showed positive impact on the removal of chlorinated pharmaceutical and personal care products. | [96] |
nZVI | Domestic sludge | Temperature–37 °C; duration–14 days | Methane content was stimulated up to 88% with addition of nZVI. | [97] |
Co | Manure slurry | Temperature–37 °C; rotation–20 rpm (in 1 min interval) | Addition of 1 mg/L Ni NPs enhanced the biogas production by 1.64 times in comparison to control. The methane volume increased by 1.86 times. | [94] |
Cu | Granular sludge | pH–7.2; temperature–30 °C; rotation–120 rpm | Cu NPs caused severe methanogenic inhibition. The 50% inhibiting concentrations determined towards aceto-clastic and hydrogenotrophic methanogens were 62 and 68 mg/L. | [98] |
ZnO | Waste activated Sludge | Temperature–37 °C; duration–14 days | 100 mg/L Zn2+ exhibited 53.7% reduction in methane production compared to control. Less VFA consumed during methanogenesis when more ZnO ENMs were present. | [99] |
ZnO | Granular sludge | pH–7.2; temperature–30 °C; rotation–120 rpm | The 50% inhibiting concentrations determined towards aceto-clastic and hydrogenotrophic methanogens were 87 and 250 mg/L. Methanogenic inhibition is due to the release of toxic divalent Zn ions caused by corrosion and dissolution of the NPs. | [98] |
CuO | Municipal waste activated sludge | Temperature–35 °C | Increase in CuO NP concentration from 5 to 1000 mg per gTS, and an increase in the inhibition of AD from 5.8 to 84.0% was observed. EC50 values of short- and long-term inhibitions were calculated as 224.2 mg CuO per g TS and 215.1 mg CuO per g TS, respectively. | [100] |
Nanoparticles | Substrate/ Feedstock | Reaction Conditions | Summary | Reference |
---|---|---|---|---|
NiO | Potato peel waste | S. cerevisiae BY4743; Instantaneous saccharificationfermentation (NIISF); temperature–37 °C, rotation–120 rpm, duration–24 h |
| [106] |
NiOand Fe3O4 | Potato peel waste | Saccharomyces cerevisiae BY4743; temperature–30 °C; rotation–120 rpm; duration–72 h |
| [107] |
ZnO | Rice straw | Fusariumoxysporum;temperature–20 to 25 °C; pH–6.0 to 8.0; rotation –100 to 200 rpm; duration –72 h |
| [108] |
Magnetic nanoparticles | Corn starch | Immobilized Saccharomyces cerevisiae; pH–4.0; temperature –60 °C |
| [47] |
Nanoparticles | Substrate/Feedstock | Reaction Conditions | Summary | Reference |
---|---|---|---|---|
Fe3O4/ZnMg(Al)O | Microalgal oil | Temperature–65 °C;duration–3 h;methanol to oil ratio: 12:1 | Biodiesel yield reached 94% under the optimal conditions. 82% biodiesel yield was observed after 7 times regeneration. Increase of the molar ratio of methanol to oil increased biodiesel yield. | [78] |
SiO2 and SiO2–CH3 | Chlorella vulgaris | Methanol/sulfuric acid–85:15 v/v;temperature–70 °C;duration–40 min | Dry cell weight increased by 177% and 210% by adding SiO2 and SiO2–CH3 NPs. Addition of NPs increased CO2 mass transfer rate. | [115] |
CaO and MgO | Waste cooking oil | For CaO: weight–1.5%; methanol to oil ratio–1:7; duration–6 h. For MgO: weight–3% (0.7 g of Nano CaO and 0.5 g of Nano MgO); alcohol to oil ratio–1:7; duration–6 h. | Nano MgO alone is not capable of catalysing the transesterification reaction due to weaker affinity. Nano MgO in combination with CaO increased the transesterification yield. The biodiesel yield reached 98.95% of weight. | [116] |
Ni doped ZnOnanocatalyst | Castor oil | Methanol to oil ratio–1:8; catalyst loading –11% (w/w); temperature–55 °C, duration–60 min | 95.20% higher biodiesel yield was observed under optimum conditions. The reusability study of nano-catalysts showed efficient for 3 cycles. | [117] |
Ni0.5Zn0.5Fe2O4 doped with Cu | Soybean oil | Methanol to oil ratio–1:20; catalyst loading–4% (wt); temperature–180 °C, duration– 1 h, | Presence of Cu ions facilitated an increase of 5.5–85% in the conversion values in methyl esters. Cu2+ ions doping influenced in the structure, morphology and magnetic properties of nano-ferrites. | [44] |
CaO | Bombaxceiba oil | Methanol to oil ratio–30.37:1; catalystloading–1.5% (wt); temperature–65 °C;duration– 70.52 min | 96.2% yield of methyl ester was achieved under optimum conditions. CaO-NPs reused for five consecutive cycles with minimum loss of activity. | [118] |
Calcite/Au | Sunflower oil | Methanol to oil ratio–9:1; catalyst loading: 0.3% (wt); temperature–65 °C;duration– 6 h | The oil conversion was in the range of 90–97% under optimum conditions. The nano-catalysts were stable up to 10 cycles without loss of activity. | [119] |
MgO/MgAl2O4 | Sunflower oil | Methanol to oil ratio–12:1; catalyst loading– 3% (wt); temperature–110 °C; time–3 h | 95.7% conversion of sunflower oil achieved. The prepared catalyst was stable for 6 cycles. Size, shape and crystallinity of catalysts are important parameters affecting biodiesel production. | [120] |
Hydrotalcite particles with Mg/Al | Jatropha oil | Methanol to oil ratio–0.4:1 (v/v); catalyst loading– 1% (wt); temperature–44.85 °C;duration– 1.5 h; anhydrous methanol–40 mL; sulfuric acid–4 mL | 95.2% biodiesel yield was achieved under optimal conditions. The catalyst showed reliable performance for 8 consecutive cycles. | [121] |
TiO2–ZnO | Palm oil | Methanol to oil ratio –6:1; temperature–50–80 °C; duration– 5 h | 92.2% FAME conversion and 92% yield was attained within 5 h at 60 °C. The synthesized catalysts were characterized by XRD, FT–IR, and FE–SEM. | [122] |
CaO | Rice bran oil | Methanol to oil ratio–30:1; temperature–65 °C; duration–120 min; catalyst loading = 0.4%(wt) | 93% FAME yield observed after 120 min under optimum conditions. The reusability of catalyst revealed that the FAME yield decreased significantly after fifth cycle. | [123] |
CaO | Microalgae oil | Methanol to oil ratio–10:1; temperature–70 °C, duration– 3.6 h, methanol/oil; catalyst loading–1.7% (wt) | The nanoparticles are of spherical shape with average particle size of 75 nm. 86.41% microalgal biodiesel yield reported under optimal conditions. Reusability study of catalyst revealed 86.41% to 67.87% loss in biodiesel production after the sixth cycle. | [124] |
ZnO | Waste cooking oil | Methanol to oil ratio– 6:1; temperature–60 °C; duration– 15 min; catalyst loading–1.5% (wt) | FAME conversions yield up to 96% achieved under ultrasonic irradiation. Synthesized biodiesel properties such as density and viscosity were at par with standard biodiesel. | [125] |
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Arya, I.; Poona, A.; Dikshit, P.K.; Pandit, S.; Kumar, J.; Singh, H.N.; Jha, N.K.; Rudayni, H.A.; Chaudhary, A.A.; Kumar, S. Current Trends and Future Prospects of Nanotechnology in Biofuel Production. Catalysts 2021, 11, 1308. https://doi.org/10.3390/catal11111308
Arya I, Poona A, Dikshit PK, Pandit S, Kumar J, Singh HN, Jha NK, Rudayni HA, Chaudhary AA, Kumar S. Current Trends and Future Prospects of Nanotechnology in Biofuel Production. Catalysts. 2021; 11(11):1308. https://doi.org/10.3390/catal11111308
Chicago/Turabian StyleArya, Indrajeet, Asha Poona, Pritam Kumar Dikshit, Soumya Pandit, Jatin Kumar, Himanshu Narayan Singh, Niraj Kumar Jha, Hassan Ahmed Rudayni, Anis Ahmad Chaudhary, and Sanjay Kumar. 2021. "Current Trends and Future Prospects of Nanotechnology in Biofuel Production" Catalysts 11, no. 11: 1308. https://doi.org/10.3390/catal11111308