As a significant industrial material, MgO is mainly obtained by the pyrolysis of magnesite (magnesium carbonate) under air conditions, producing large amounts of CO2 and contributing to global warming. In this work, the MgO was prepared using the hydrogenation reduction method. The reaction conditions led to CO2 emissions of <1% and an overall temperature decrease of ~80°C. The highly active MgO prepared by hydrogenation reduction led to a precipitation rate of Co and Ni >99% with a short separation time. Electron paramagnetic resonance, CO2 temperature programmed desorption, and diffuse reflectance infrared spectroscopy analyses showed that the MgO prepared by hydrogenation contained oxygen vacancies, which improved the alkalinity of the MgO and promoted the precipitation of Ni2+ and Co2+ by adsorption of hydroxyl oxygen to induce water dissociation, thereby enhancing their separation efficiency.

中文翻译：

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碳酸盐加氢制备高活性 MgO 及其在钴镍分离中的应用


MgO 作为一种重要的工业材料，主要是通过菱镁矿（碳酸镁）在空气条件下热解获得的，产生大量的 CO2，导致全球变暖。在这项工作中，使用加氢还原法制备了 MgO。反应条件导致 CO2 排放量为 <1%，总温度降低 ~80°C。 加氢还原法制备的高活性 MgO 导致 Co 和 Ni >99% 的沉淀速率较短。电子顺磁共振、CO2程序升温脱附和漫反射红外光谱分析表明，加氢制备的MgO含有氧空位，提高了MgO的碱度，并通过吸附羟基氧诱导水解离促进了Ni2+和Co2+的沉淀，从而提高了它们的分离效率。