Elucidating CO2 nanobubble interfacial reactivity and impacts on water chemistry

Cerrón-Calle, Gabriel Antonio; Magdaleno, Andre L.; Graf, John; Apul, Onur G.; Garcia‐Segura, Sergi

doi:10.1016/j.jcis.2021.09.033

Cited by 39 publications

(19 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, CO2 and CO2 after 8% H2 in Ar had noticeably large diameters at 50 vol.% ethanol aqueous solution (2000-3500 nm). The CO2 nanobubbles undergo mass loss at a higher pH, corresponding to the mass transfer process owing to the concentration gradient at the surrounding nanobubbles, and their mean diameter decreased [41]. Figure 3 shows that the CO2 diameter decreased after 20 days, in 0 vol.% (from 1300 to 600 nm) and 50 vol.% ethanol (from 3500 to 2200 nm).…”

Section: Determination Of Diameter Of Nanobubblesmentioning

confidence: 99%

Stability and Free Radical Production for CO2 and H2 in Air Nanobubbles in Ethanol Aqueous Solution

Han

Kurokawa²,

Matsui³

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

In this study, 8% hydrogen (H2) in argon (Ar) and carbon dioxide (CO2) gas nanobubbles was produced at 10, 30, and 50 vol.% of ethanol aqueous solution by the high-speed agitation method with gas. They became stable for a long period (for instance, 20 days), having a high negative zeta potential (−40 to −50 mV) at alkaline near pH 9, especially for 10 vol.% of ethanol aqueous solution. The extended Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory was used to evaluate the nanobubble stability. When the nanobubble in ethanol alkaline aqueous solution changed to an acidic pH of around 5, the zeta potential of nanobubbles was almost zero and the decrease in the number of nanobubbles was identified by the particle trajectory method (Nano site). The collapsed nanobubbles at zero charge were detected thanks to the presence of few free radicals using G-CYPMPO spin trap reagent in electron spin resonance (ESR) spectroscopy. The free radicals produced were superoxide anions at collapsed 8%H2 in Ar nanobubbles and hydroxyl radicals at collapsed CO2 nanobubbles. On the other hand, the collapse of mixed CO2 and H2 in Ar nanobubble showed no free radicals. The possible presence of long-term stable nanobubbles and the absence of free radicals for mixed H2 and CO2 nanobubble would be useful to understand the beverage quality.

show abstract

Section: Determination Of Diameter Of Nanobubblesmentioning

confidence: 99%

Stability and Free Radical Production for CO2 and H2 in Air Nanobubbles in Ethanol Aqueous Solution

Han

Kurokawa²,

Matsui³

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…The pH control by carbonate buffer through CO2 bubbling is a common practice at water treatment plants to lower water pH, especially after softening processes. Note that CO 2 is an acid gas that when dissolved in water forms carbonic acid (Cerrón-Calle et al, 2022a). Here CO2 bubbling was employed to control solution pH during ERN.…”

Section: Effect Of Ph Control On the Electrochemical Reduction Of Nit...mentioning

confidence: 99%

Overcoming barriers for nitrate electrochemical reduction: By-passing water hardness

et al. 2022

Self Cite

View full text Add to dashboard Cite

“…Despite being produced through various methods, such as hydrodynamic or ultrasonic cavitation, electrolysis, and porous membranes, NBs and MBs have distinct properties. With a high zeta potential (−20 to −50 mV) and long retention time (from weeks to months), NBs exhibit Brownian motion and offer unique bubble–surface interactions that enhance nutrient uptake and foster microbial communities. − MBs, despite having a shorter lifespan, boost gas–liquid mass transfer due to their smaller size compared with millimeter-sized bubbles (i.e., macrobubbles) . Thus, MNB aeration technology finds numerous applications, including in wastewater remediation and in agriculture …”

Section: Introductionmentioning

confidence: 99%

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Marcelino,

Wongkiew,

Shitanaka

et al. 2023

ACS EST Eng.

View full text Add to dashboard Cite

Aquaponics is a climate-smart food production system that relies on nutrient recovery from aquaculture effluent. The availability of dissolved oxygen (DO) limits the performance of aquaponic systems. To address this issue, air micronanobubbles (MNBs) were tested as an alternative aeration method. Due to their small size (<50 μm) and long-term stability, MNBs can enhance the gas−liquid mass transfer of oxygen and maintain DO concentrations above saturation, enhancing aerobic biochemical processes. Through 16S rRNA gene metabarcoding and water quality analyses, we investigated the influence of continuous MNB aeration on DO concentrations and carbon−nitrogen cycling. Our results indicated that continuous MNB aeration (K L a 20 = 7.76 ± 0.38 h −1 ) in the grow bed of an aquaponic system increased DO concentrations to 9.31 ± 1.57 mg L −1 without affecting other system components. In comparison, aeration with a conventional diffuser (K L a 20 = 1.73 ± 0.54 h −1 ) maintained lower DO concentrations of 6.32 ± 0.32 mg L −1 on average. Further benefits of MNBs include higher reductions in total solids (16 ± 2%) and volatile solids (32 ± 2%) and an increase in nitrate concentrations over time. Notably, MNB aeration enhanced the total butterhead lettuce yield and root biomass per plant by 35 ± 8% and 20 ± 5%, respectively. While MNB aeration reshaped the microbial community and potentially disturbed certain microbial symbiotic relationships (e.g., Denitratisoma, Thermomonas, and Nitrospira), the overall metabolic pathways remained largely intact. Overall, our study provides insights into the application of MNB aeration to enhance plant biomass production in floating raft aquaponic systems and increase nitrification and remineralization.

show abstract

Elucidating CO2 nanobubble interfacial reactivity and impacts on water chemistry

Cited by 39 publications

References 30 publications

Stability and Free Radical Production for CO2 and H2 in Air Nanobubbles in Ethanol Aqueous Solution

Stability and Free Radical Production for CO2 and H2 in Air Nanobubbles in Ethanol Aqueous Solution

Overcoming barriers for nitrate electrochemical reduction: By-passing water hardness

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Contact Info

Product

Resources

About