Carbon sequestration in graphene oxide modified cementitious system
Carbon sequestration in graphene oxide modified cementitious system
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DOI：
10.1016/j.jobe.2022.105356
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发表时间：
2022-10
影响因子：
6.4
通讯作者：
G. Mishra;Ashraf Warda;Surendra P. Shah
中科院分区：
文献类型：
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作者：
G. Mishra;Ashraf Warda;Surendra P. Shah
氧化石墨烯由于其独特的韧性和柔韧性，正在成为一种很有前途的纳米材料。本研究考察了氧化石墨烯（GO）除机械性能外，在胶凝基材料中封存二氧化碳的潜在用途。研究了氧化石墨烯表面对水泥浆体水化机理和碳酸盐矿化的影响。实验结果表明，应用一定量的氧化石墨烯可使早期抗压强度提高40%。通过热重分析，对GO-水泥基体进行加速碳固化以评估co2固存效果，结果表明，添加低浓度的GO（即0.05%）可使胶凝体系的co2吸收量提高30%。此外，FTIR研究证实了co2分子的物理吸附和C-S-H的改变。这一发现表明，氧化石墨烯的应用不仅改善了胶凝体系的力学性能，而且显著增强了胶凝体系的二氧化碳固存能力。
Graphene oxide is emerging as a promising nanomaterial owing to its unique property of being a strong and flexible material. This work examines the potential use of graphene oxide (GO) for CO2sequestration in cementitious-based materials in addition to mechanical properties. The effect of oxidized graphene surface on the hydration mechanism of cement paste and carbonate mineralization was investigated. Experimental results show that the application of GO at optimum amount offers 40% improvement in compressive strength at an early age. Accelerated carbon curing of GO-cement matrix was performed to evaluate CO2sequestration through thermogravimetric analysis and results revealed that adding a low concentration of GO (i.e. 0.05%) improved CO2uptake by 30% in the cementitious system. Further, physical adsorption of CO2molecules and alteration in C–S–H was confirmed by the FTIR study. This finding suggests that the application of GO, not only improved the mechanical properties but it significantly enhanced the CO2sequestration in cementitious systems.