Towards green carbon capture and storage using waste concrete based seawater: A microfluidic analysis
Towards green carbon capture and storage using waste concrete based seawater: A microfluidic analysis
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利用废混凝土海水实现绿色碳捕获和储存：微流体分析
DOI：
10.1016/j.jenvman.2023.118760
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发表时间：
2023
影响因子：
8.7
通讯作者：
Kim, Myeongsub
中科院分区：
文献类型：
--
作者：
Ratanpara, Abhishek;Ricca, John G.;Gowda, Ayush;Abraham, Abel;Wiskoff, Sofia;Zauder, Victor;Sharma, Ria;Hafez, Mazen;Kim, Myeongsub
碳捕获和利用技术是致力于缓解大气二氧化碳（CO2）上升的紧迫影响的研究流。本研究探讨了一种潜在的环保意识的溶剂，以捕获和利用CO2使用废混凝土和海水在反应堆条件下。虽然海水的CO2溶解度低，由于盐度，废混凝土提高海水的pH值和碱度，作为原料的CO2溶解和抵消盐度的不利影响。为了评价新型天然海水混凝土溶液的CO2捕集性能，在微通道中使用荧光显微镜测量了暴露于CO2的溶液随时间变化的pH值变化。溶液中溶解的CO2浓度由pH值的变化得出，在海水中加入混凝土后，总溶解碳从0.034增加到0.13 M，增加了4倍，CO2溶解系数从530增加到835 μm2/s，增加了57.54%。电解进一步提高了海水混凝土溶液的CO2捕集能力，通过增加pH值，使固体沉淀的碳酸盐矿物。拉曼光谱和扫描电子显微镜表明，电解驱动的沉淀物主要是无定形碳酸钙，有用的贝壳和珊瑚礁的积木。
Carbon capture and utilization technology is the research stream dedicated to mitigating the pressing effect of rising atmospheric carbon dioxide (CO2). The present study investigates a potential environmentally conscious solvent to capture and utilize CO2using waste concrete and seawater under reactor conditions. Although seawater's CO2soubility is low due to salinity, waste concrete raises seawater's pH and alkalinity, acting as a feedstock for CO2dissolution and offsetting the adverse effects of salinity. To evaluate the performance of the novel natural seawater-concrete solutions for CO2capture, time-dependent pH changes of solutions exposed to CO2were measured in a microchannel using fluorescence microscopy. The concentration of dissolved CO2in the solution was derived from pH change, revealing a 4-fold increase in the total dissolved carbon from 0.034 to 0.13 M and a 57.54% increase in the CO2dissolution coefficient from 530 to 835 μm2/s in seawater upon concrete addition. Electrolysis further enhanced the CO2capture capacity of the seawater-concrete solution by increasing the pH, enabling the solid precipitation of carbonate minerals. Raman spectroscopy and scanning electron microscopy showed that electrolysis-driven precipitates are mainly amorphous calcium carbonates, useful building blocks for seashells and coral reefs.