Role of bulk nanobubbles in removing organic pollutants in wastewater treatment

Wu, Jiajia; Zhang, Kejia; Cen, Cheng; Wu, Xiaogang; Mao, Ruyin; Zheng, Yingying

doi:10.1186/s13568-021-01254-0

Cited by 57 publications

(27 citation statements)

References 73 publications

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“…It has been proved that bulk nanobubbles can be very stable which is significant for their applications. − Here, we also study the lifetime of bulk nanobubbles produced by accelerated electrons irradiation. The irradiation parameters of irradiation dose rate of 1.09 kGy/s and irradiation dose of 1000 kGy was chose in this experiment.…”

Section: Resultsmentioning

confidence: 99%

Formation of Bulk Nanobubbles Induced by Accelerated Electrons Irradiation: Dependences on Dose Rates and Doses of Irradiation

et al. 2022

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Radiation on aqueous solutions can induce water radiolysis with products of radicals, H2, H2O2, and so on, and their consequent biological effects have long been interested in radiation chemistry. Unlike the decomposition of water by electric current that produces a significant number of bubbles, the gas products from the radiolysis of water are normally invisible by bare eyes, little is known on whether nanosized bubbles can be produced and what their dynamics are upon irradiation. Here, we first presented the formation of nanoscale bulk bubbles by irradiating pure water with accelerated electrons and their concentration and size distribution changes with the dose and rate of irradiation. The nanoparticle tracking analysis showed that irradiation can actually produce a certain amount of bulk nanobubbles in pure water. They exhibited a dependence on the irradiation dose rates and irradiation doses. The results indicated that the concentration of formed bulk nanobubbles increased as the irradiation dose rates increased, but it will increase and then decrease with the increased irradiation doses. The formed bulk nanobubbles could maintain stability for several hours. Our findings will provide a new angle of view for the radiation chemistry of water, and the formed nanobubbles may help elucidate the biological effects of irradiated solutions.

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Section: Resultsmentioning

confidence: 99%

Formation of Bulk Nanobubbles Induced by Accelerated Electrons Irradiation: Dependences on Dose Rates and Doses of Irradiation

et al. 2022

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“…Moreover, the degradation of organic dyes is enhanced under alkaline conditions . Considering the occurrence of such alkaline fields in activated sludge, the micromotors could have utilization for the treatment of organic pollutants in aeration and sedimentation tanks …”

Section: Micromotors For Microplastics Separationmentioning

confidence: 99%

“…34 Considering the occurrence of such alkaline fields in activated sludge, the micromotors could have utilization for the treatment of organic pollutants in aeration and sedimentation tanks. 35 The combination of MnO 2 and ferromagnetic materials provide micromotors with bubble propulsion owing to hydrogen peroxide decomposition and the capability to be recovered by magnets and even magnetically steered by an external magnetic field. Magnetic Fe 3 O 4 −MnO 2 and Fe 2 O 3 − MnO 2 micromotors with core−shell geometry were fabricated by hydrothermal reaction and heat treatment methods.…”

Section: Micromotors For Microplastics Separationmentioning

confidence: 99%

Micromachines for Microplastics Treatment

Hermanová

Pumera

2022

ACS Nanosci. Au

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The increasing accumulation of persistent nondegradable microplastics in the marine environment represents a global environmental problem. Among emerging approaches to tackle microplastics are micro-and nanomotors, tiny devices capable of autonomous propulsion powered by chemical fuels or light. These devices are capable of on-the-fly recognition, capture, and decomposition of pollutants. In the past, various micromotors were designed to efficiently remove and degrade soluble organic pollutants. Current effort is given to the rational design and surface functionalization to achieve micromotors capable of capturing, transporting, and releasing microplastics of different shapes and chemical structures. The catalytic micromotors performing photocatalysis and photo-Fenton chemistry hold great promise for the degradation of most common plastics. In this review, we highlight recent progress in the field of micromotors for microplastics treatment. These tiny self-propelled machines are expected to stimulate a quantum leap in environmental remediation.

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“…Nanobubbles (NBs) are rapidly gathering widespread attention in the research community for possible applications in agriculture, , water treatment, , industrial cleaning, and biomedicine. − Consisting of a low solubility gas core with a stabilizing shell, biomedical NBs, also known as ultrafine bubbles, are <1 μm in diameter, distinguishing them from larger microbubbles (MBs, 1–10 μm), which are currently in clinical use as ultrasound (US) contrast agents . MB size allows their free flow through the vasculature, while their gas core provides US imaging contrast enhancement owing to the mismatch in acoustic impedance between gas and the surrounding blood and soft tissue.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Nanobubble Size and Stability on Ultrasound Enhanced Drug Delivery

et al. 2022

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Lipid-shelled nanobubbles (NBs) are emerging as potential dual diagnostic and therapeutic agents. Similar to their micron-scale counterparts, microbubbles (1–10 μm), they can act as ultrasound contrast agents as well as locally enhance therapeutic uptake. Recently, it has been shown that the reduced size of NBs (<1 μm) promotes increased uptake and accumulation in tumor interstitial space, which can enhance their diagnostic and therapeutic performance. However, accurate characterization of NB size and concentration is challenging and may limit their translation into clinical use. Their submicron nature limits accuracy of conventional microscopy techniques, while common light scattering techniques fail to distinguish between subpopulations present in NB samples (i.e., bubbles and liposomes). Due to the difficulty in the characterization of NBs, relatively little is known about the influence of size on their therapeutic performance. In this study, we describe a novel method of using a commercially available nanoparticle tracking analysis system, to distinguish between NBs and liposomes based on their differing optical properties. We used this technique to characterize three NB populations of varying size, isolated via centrifugation, and subsequently used this to assess their potential for enhancing localized delivery. Confocal fluorescence microscopy and image analysis were used to quantify the ultrasound enhanced uptake of fluorescent dextran into live colorectal cancer cells. Our results showed that the amount of localized uptake did not follow the expected trends, in which larger NB populations out-perform smaller NBs, at matched concentration. To understand this observed behavior, the stability of each NB population was assessed. It was found that dilution of the NB samples from their stock concentration influences their stability, and it is hypothesized that both the total free lipid and interbubble distance play a role in NB lifetime, in agreement with previously proposed theories and models.

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Role of bulk nanobubbles in removing organic pollutants in wastewater treatment

Cited by 57 publications

References 73 publications

Formation of Bulk Nanobubbles Induced by Accelerated Electrons Irradiation: Dependences on Dose Rates and Doses of Irradiation

Formation of Bulk Nanobubbles Induced by Accelerated Electrons Irradiation: Dependences on Dose Rates and Doses of Irradiation

Micromachines for Microplastics Treatment

The Influence of Nanobubble Size and Stability on Ultrasound Enhanced Drug Delivery

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