Elucidating the role of nanoparticles on photosynthetic biogas upgrading: Influence of biogas type, nanoparticle concentration and light source
Abstract
Three different nanoparticles, namely Fe2O3, carbon coated zero valent iron (CACOI) and SiO2, were added to a mixed microalgae culture in order to improve photosynthetic biogas upgrading. Fe2O3 and CACOI nanoparticles at 10 mg/L supported higher CO2 consumptions compared to their respective controls. The addition of Fe2O3 nanoparticles at 70 mg/L resulted in a 38 % enhanced biomass productivity, and 20 % higher CO2 consumption but delayed exponential growth. The CACOI nanoparticles at 70 mg/L resulted in a shorter lag phase, enhanced CO2 consumption by 13 %, and carbohydrate content enhancement by 64 %, while the addition of SiO2 nanoparticles at this concentration induced an enhanced lipid and carbohydrates production by 47 % and 68 %, respectively. Interestingly, UV light exposure reduced the beneficial effects of nanoparticles, although CACOI nanoparticles still supported a shorter lag phase and higher carbohydrates production at 70 mg/L. In brief, CACOI nanoparticles hold an untapped potential to promote the metabolism of microalgae during photosynthetic biogas upgrading.
- Publication:
-
Algal Research
- Pub Date:
- November 2022
- DOI:
- 10.1016/j.algal.2022.102899
- Bibcode:
- 2022AlgRe..6802899V
- Keywords:
-
- BA;
- biogas A;
- BB;
- biogas B;
- BET;
- Brunauer-Emmett-Teller;
- BJH;
- Barrett;
- Joyner & Halenda;
- CACOI;
- carbon coated zero valent iron;
- CH<SUB>4</SUB>;
- methane;
- CO<SUB>2</SUB>;
- carbon dioxide;
- EDS;
- energy dispersive spectroscopy;
- Fe<SUB>2</SUB>O<SUB>3</SUB>;
- iron (III) oxide;
- H<SUB>2</SUB>S;
- hydrogen sulfide;
- IUPAC;
- International Union of Pure and Applied Chemistry;
- LED;
- light-emitting diode;
- NPs;
- nanoparticles;
- OD<SUB>750</SUB>;
- optical density at 750 nm;
- Px;
- biomass productivity;
- ROS;
- reactive oxygen species;
- RuBisCO;
- Ribulose-1;
- 5-bisphosphate carboxylase-oxygenase;
- SEM;
- Scanning Electron Microscopy;
- SiO<SUB>2</SUB>;
- silicon dioxide;
- TSS;
- total suspended solids