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Microbubbles Loaded with Nickel Nanoparticles: A Perspective for Carbon Sequestration
Analytical Chemistry ( IF 7.4 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1021/acs.analchem.7b02205
Seokju Seo 1 , Minh Nguyen 1 , Mohammad Mastiani 1 , Gabriel Navarrete 1 , Myeongsub Kim 1
Affiliation  

This work reports a microfluidic study investigating the feasibility of accelerating gaseous carbon dioxide (CO2) dissolution into a continuous aqueous phase with the use of metallic nickel (Ni) nanoparticles (NPs) under conditions specific to carbon sequestration in saline aquifers. The dissolution of CO2 bubbles at different pH levels and salinities was studied to understand the effects that the intrinsic characteristics of brine in real reservoir conditions would have on CO2 solubility. Results showed that an increased shrinkage of CO2 bubbles occurred with higher basicity, while an increased expansion of CO2 bubbles was observed with a proportional increase in salinity. To achieve acceleration of CO2 dissolution in acidic brine containing high salinity content, the catalytic effect of Ni NPs was investigated by monitoring change in CO2 bubble size at various Ni NPs concentrations. The optimal concentration for the Ni NPs suspension was determined to be 30 mg L–1; increasing the concentration up to 30 mg L–1 showed a significant increase in the dissolution of CO2 bubbles, but increasing from 30 to 50 mg L–1 displayed a decrease in catalytic potential, due to the decreased translational diffusion coefficient that occurs at higher concentrations. The optimal additive concentration of Ni NPs was tested with variations of solution at acidic and basic conditions and different levels of salinity to reveal how effectively the Ni NPs behave under real reservoir conditions. At the acidic level, Ni NPs proved to be more effective in catalyzing CO2 dissolution and can sufficiently alleviate the negative impact of salinity in brine.

中文翻译:

镍纳米粒子负载的微气泡:碳固存的一个角度。

这项工作报告了一项微流研究,研究了在特定于盐分含水层中碳固存的条件下,使用金属镍(Ni)纳米颗粒(NPs)来加速将气态二氧化碳(CO 2)溶解到连续水相中的可行性。研究了在不同pH值和盐度下CO 2气泡的溶解情况,以了解盐水在实际储层条件下的内在特征对CO 2溶解度的影响。结果表明,随着碱度的升高,CO 2气泡的收缩率增加,而随着盐度的增加,观察到CO 2气泡的膨胀率增加。实现CO的加速2在高盐分含量的酸性盐水中溶解时,通过监测各种Ni NPs浓度下CO 2气泡大小的变化,研究了Ni NPs的催化作用。Ni NPs悬浮液的最佳浓度确定为30 mg L –1;将浓度提高到30 mg L –1表示CO 2气泡的溶解显着增加,但从30 mg L –1增加到50 mg L –1由于在较高浓度下发生的翻译扩散系数降低,因此显示出催化潜力的降低。在酸性和碱性条件下以及盐度不同的情况下,通过改变溶液来测试Ni NPs的最佳添加浓度,以揭示Ni NPs在实际储层条件下的表现如何有效。在酸性条件下,Ni NP被证明在催化CO 2溶解方面更有效,并且可以充分减轻盐水中盐度的负面影响。
更新日期:2017-09-26
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