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Glycine-induced synthesis of vaterite by direct aqueous mineral carbonation of desulfurization gypsum
Environmental Chemistry Letters ( IF 15.0 ) Pub Date : 2022-04-15 , DOI: 10.1007/s10311-022-01446-5
Xuemin Liu 1 , Bo Wang 2 , Zhien Zhang 3 , Zihe Pan 4 , Huaigang Cheng 4 , Fangqin Cheng 4
Affiliation  

Climate change is urgently calling for rapid methods to capture atmospheric carbon dioxide (CO2). CO2 can be sequestred into gypsum from gas desulfurization by carbonation to produce calcium carbonate (CaCO3). However, CaCO3 is produced as a mixture of polymorphs including calcite and vaterite polymorphs, which limits applications. Therefore, we present here a method to produce CaCO3 enriched in the vaterite polymorph. We reacted CO2 with gypsum from gas desulfurization in the presence of glycine. Carbonation products were analyzed by X-ray diffraction, scanning electron microscopy, electrospray ionization mass spectrometry, and Fourier transform infrared spectroscopy. Results show that vaterite content increases from 60 to 97% with increasing glycine concentration from 0 to 20 wt% and then kept a constant value, indicating that glycine promotes the formation of vaterite by inhibiting the growth of the calcite polymorph. We also observed that the intermediate glycinate calcium played a major role in stimulating vaterite growth. Overall, nearly pure vaterite was synthesized successfully by carbonation of gypsum in the presence of glycine.



中文翻译:

甘氨酸诱导脱硫石膏直接含水矿物碳酸化合成球霰石

气候变化迫切需要快速捕获大气中二氧化碳(CO 2)的方法。CO 2可以通过碳酸化从气体脱硫中螯合到石膏中以生产碳酸钙(CaCO 3)。然而,CaCO 3是作为包括方解石和球霰石多晶型的多晶型物的混合物产生的,这限制了应用。因此,我们在此提出一种生产富含球霰石多晶型物的CaCO 3的方法。我们反应了 CO 2与甘氨酸存在下气体脱硫的石膏。通过 X 射线衍射、扫描电子显微镜、电喷雾电离质谱和傅里叶变换红外光谱分析碳酸化产物。结果表明,随着甘氨酸浓度从0 wt%增加到20 wt%,球霰石含量从60%增加到97%,然后保持不变,表明甘氨酸通过抑制方解石多晶型物的生长来促进球霰石的形成。我们还观察到中间体甘氨酸钙在刺激球霰石生长中起主要作用。总体而言,在甘氨酸存在下,通过石膏的碳酸化成功合成了近乎纯的球霰石。

更新日期:2022-04-18
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