Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.jcis.2021.09.033 Gabriel Antonio Cerrón-Calle 1 , Andre Luna Magdaleno 1 , John C Graf 2 , Onur G Apul 3 , Sergi Garcia-Segura 1
|
Hypothesis
Carbon dioxide nanobubbles can increase effective gas-transfer to solution and enhance buffering capacity given the stable suspension in water of CO2 gas within nanobubbles and the existence of larger gas/water interface.
Experiments
The physico-chemical properties and responses of CO2 nanobubbles were recorded at different generation times (10, 30, 50, and 70 min) and benchmarked against traditional macrobubbles of CO2 for the same amount of delivered gas. Effective concentration of CO2 was evaluated by measuring the buffer capacity (β). The size distribution of nanobubbles during the experiments was measured by Nanoparticle Track Analysis.
Findings
The mass transfer coefficient (KLa) showed a dramatically increase by 11-fold for the same volume of gas delivered when using nanobubbles. The β values obtained for nanobubbles were 7 times higher than that of traditional bubbles which can lead to significant source of CO2 availability by using the nanobubble method. Nanobubbles, consequently, undergo mass loss at higher pH corresponding to mass transfer process due to concentration gradient at the surrounding nanobubbles. This is the first report of CO2 nanobubbles buffer capacity evaluation.
中文翻译：
阐明 CO2 纳米气泡界面反应性及其对水化学的影响
假设
鉴于纳米气泡内CO 2气体在水中的稳定悬浮以及较大的气/水界面的存在，二氧化碳纳米气泡可以增加向溶液的有效气体转移并增强缓冲能力。
实验
在不同的生成时间（10、30、50 和 70 分钟）记录了 CO 2纳米气泡的物理化学性质和响应，并以相同数量的输送气体的传统 CO 2大气泡为基准。CO 2 的有效浓度通过测量缓冲容量（β）来评估。实验过程中纳米气泡的尺寸分布通过纳米粒子轨迹分析测量。
发现
传质系数（ķ大号一个）显示使用纳米气泡时，显着地增加由对于相同体积的气体11倍递送。纳米气泡获得的β值比传统气泡高 7 倍，这可以通过使用纳米气泡方法获得重要的 CO 2来源。因此，由于周围纳米气泡的浓度梯度，纳米气泡在与传质过程相对应的较高 pH 值下经历质量损失。这是CO 2纳米气泡缓冲容量评估的第一份报告。
京公网安备 11010802027423号