Nanobubble technology applications in environmental and agricultural systems: Opportunities and challenges

Marcelino, Kyle Rafael; Ling, Li; Wongkiew, Sumeth; Ni, Hua; Surendra, K.C.; Shitanaka, Ty; Lü, Hui; Khanal, Samir Kumar

doi:10.1080/10643389.2022.2136931

Cited by 35 publications

(20 citation statements)

References 135 publications

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“…The fact that oxygen NB-derived ·OH can be generated in the absence of applied dynamic stimuli was also confirmed by Takahashi and Liu et al in their experiments. , However, although several theories have been proposed to elucidate the mechanism of ·OH generation, there is still a need to reach a consensus on this issue . Meanwhile, it should be noted that it is speculated that the destabilization of NBs is crucial for the exploitation of this property …”

Section: Resultsmentioning

confidence: 66%

“…35 Meanwhile, it should be noted that it is speculated that the destabilization of NBs is crucial for the exploitation of this property. 36 Production of •OH under Different Operating Parameters. Figure 2 shows the production of •OH during the collapse of oxygen NBs in the suspensions prepared under different operating parameters through single-factor experiments.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Oxidative Capacity of Oxygen Nanobubbles and Their Mechanism for the Catalytic Oxidation of Ferrous Ions with Copper as a Catalyst in Sulfuric Acid Medium

Cui

Sun

et al. 2023

Langmuir

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Nanobubble (NB) technology has demonstrated the potential to enhance or substitute for current treatment processes in various areas. However, research employing it as a novel advanced oxidation process has thus far been relatively limited. Herein, we focused on the oxidative capacity of oxygen NBs and investigated the feasibility of utilizing their enhanced oxidation of ferrous ions (Fe 2+ ) in a sulfuric acid medium when using copper as a catalyst and their effect mechanism. It was demonstrated that oxygen NBs could collapse to produce hydroxyl radicals (•OH) in the absence of dynamic stimuli using electron spin resonance spectroscopy, and methylene blue was used as a molecular probe for •OH to illustrate that NB stability, determined by their properties, is the critical factor affecting •OH release. In subsequent Fe 2+ oxidation experiments, it was discovered that both strong acidity and copper ions (Cu 2+ ) contribute to accelerating the collapse of NBs to produce •OH. While •OH derived from the collapse of NBs acts on Fe 2+ , the molecular oxygen generated homologously with •OH will further activate the catalytic oxidation of Fe 2+ by interacting with Cu 2+ . With the synergistic effect of the above two oxidationdriven mechanisms, the oxidation rate of Fe 2+ can be significantly increased up to 88% due to the exceptional properties of oxygen NBs, which facilitate the formation of an atmosphere with persistent oxygen supersaturation and the generation of oxidation radicals. This study provides significant insight into applying NBs as a prospective technology for enhanced oxidation processes.

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Section: Resultsmentioning

confidence: 66%

Section: ■ Results and Discussionmentioning

confidence: 99%

Oxidative Capacity of Oxygen Nanobubbles and Their Mechanism for the Catalytic Oxidation of Ferrous Ions with Copper as a Catalyst in Sulfuric Acid Medium

Cui

Sun

et al. 2023

Langmuir

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“…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%

“…Based on our recent review of MNB technology, there are few studies exploring its application in aquaponic systems. However, research on hydroponics, aquaculture, and biological wastewater treatment provides valuable insights into the potential benefits of MNBs in aquaponics.…”

Section: Introductionmentioning

confidence: 99%

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

Marcelino,

Wongkiew,

Shitanaka

et al. 2023

ACS EST Eng.

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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.

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“…Although the existence of nanobubbles is still controversial, there have been some attempts to distinguish between nanoparticles (NPs) and nanobubbles [ − ], which provides increasing evidence for the existence of nanobubbles. Nanobubbles have been used in a variety of industrial applications, including aquaculture [, ], wastewater treatment [, ], food and drinks [], cleaning [], and medical applications [, ]. In particular, shelled nanobubbles are receiving increasing attention in biomedical applications because of their stability and long lifetime for enhancing drug delivery and contrast ability in ultrasound imaging [ − ].…”

Section: Introductionmentioning

confidence: 99%

From Nanovesicles to Nanobubbles Based on Repeated Compression Method

Chen,

Miao,

Yang

et al. 2023

Langmuir

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Nanobubbles have been increasingly applied in biomedicine, which is attributed to their ability to work as ultrasound imaging contrast agents and powerful gene/drug carriers. Different production techniques or approaches have been developed to generate uniform and stable shelled nanobubbles. However, these shelled nanobubbles are usually prepared based on disordered shell materials, such as free phospholipids and polymers. In recent years, the continuous repeated compression method for a gas−liquid mixture has been developed to produce free and lipid-shelled nanobubbles. In this study, to explore the response of well-organized nanostructures to this method, the repeated compression method was used to treat preprepared liposomes and polymeric nanovesicles. Size distribution, morphologies, and ultrasound image contrast enhancement of these nanovesicles were determined before and after repeated compression. Results demonstrate that the presence of a phospholipid bilayer is vital to form liposome-based nanobubbles. And the low elastic modulus of the polymeric membrane is key to encapsulate gases into polymeric nanovesicles. Overall, it demonstrated the advantages of well-organized nanostructures to produce nanobubble structures, giving new insights into the preparation and understanding of nanobubbles.

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Nanobubble technology applications in environmental and agricultural systems: Opportunities and challenges

Cited by 35 publications

References 135 publications

Oxidative Capacity of Oxygen Nanobubbles and Their Mechanism for the Catalytic Oxidation of Ferrous Ions with Copper as a Catalyst in Sulfuric Acid Medium

Oxidative Capacity of Oxygen Nanobubbles and Their Mechanism for the Catalytic Oxidation of Ferrous Ions with Copper as a Catalyst in Sulfuric Acid Medium

Micronanobubble Aeration Enhances Plant Yield and Nitrification in Aquaponic Systems

From Nanovesicles to Nanobubbles Based on Repeated Compression Method

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