What question did this study set out to answer?

This research aims to explore the efficiency of nanobubbles in removing dissolved oxygen from water under standard conditions.

May 17, 2026Chemical Engineering Science0 citationsOpen Access

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Near-complete (>99.9%) removal of dissolved oxygen from water via nanobubbles: A sustainable and high-efficiency process under standard atmospheric conditions

AKArata KiokaThe University of Tokyo SASatoshi AnzaiUnitika (Japan)YLYunfeng LiangThe University of Tokyo

Key Points

This research aims to explore the efficiency of nanobubbles in removing dissolved oxygen from water under standard conditions.
Used nitrogen nanobubbles with a size ≤ 50 nm and density ≤ 2 × 10^10 bubbles/mL.
Benchmarked the dissolved oxygen removal against conventional nitrogen gas bubbling.
Conducted numerical simulations to validate experimental results.
Achieved > 99.9% reduction of dissolved oxygen to levels < 5 ppb.
Demonstrated effectiveness across initial dissolved oxygen levels up to ∼ 49 mg/L.
Observed enhanced gas transfer and outgassing due to altered gas exchange dynamics.

Abstract

• N 2 nanobubbles (NBs) can readily decrease a dissolved oxygen (DO) level to 99.9% DO removal, a level unattainable by conventional N 2 gas bubbling. The NBs-driven DO removal is highly effective across a broad range of initial DO levels, up to ∼ 49 mg/L. While CO 2 NBs can reduce DO levels to ≤ 0.03 mg/L, the results indicate N 2 NBs are superior due to the inherent physicochemical properties of the gas. Mechanistically, NBs significantly alter gas exchange dynamics by enhancing gas transfer and Ostwald ripening, leading to O 2 outgassing as NB gas dissolves into the water. The experimentally observed DO removal efficiency aligns closely with our first-order numerical simulations, which account for the diameter and number density of the generated NBs. Furthermore, our method is reversible, allowing DO levels to naturally re-equilibrate under atmospheric conditions. These findings highlight that NBs offer a promising, environmentally friendly, and cost-effective approach for dissolved gas replacement, opening new avenues for sustainable water treatment.

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Cite This Study

Kioka et al. (Fri,) studied this question.

synapsesocial.com/papers/6a095a877880e6d24efe07a3 https://doi.org/https://doi.org/10.1016/j.ces.2026.124222

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