Synthesis of a CaO-Fe2O3-SiO2 composite from a dephosphorization slag for adsorption of CO2
Synthesis of a CaO-Fe2O3-SiO2 composite from a dephosphorization slag for adsorption of CO2
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DOI：
10.1016/j.cattod.2022.03.030
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发表时间：
2022-12-12
期刊：
影响因子：
5.3
通讯作者：
Yamashita, Hiromi
中科院分区：
文献类型：
--
作者：
Hashim, Zaza Hazrina;Kuwahara, Yasutaka;Yamashita, Hiromi
钢铁工业产生的过量废渣问题促使人们对废渣的利用进行调查。本研究的目的是开发一种利用废渣捕获二氧化碳（CO2）的吸附剂。以脱磷钢渣为原料，以Pluronic 123为模板剂，甲酸（FA）、盐酸（HCl）和硝酸（HNO3）为溶剂，合成了介孔CaO-Fe2O3-SiO2 （CFS）复合材料。采用扫描电镜（SEM）、透射电镜（TEM）、扫描透射电镜（STEM）、x射线衍射（XRD）、x射线光电子能谱（XPS）和N2吸附-脱附测定等方法对制备的样品进行了形貌和物理化学表征。在重复的CO2吸附循环中考察了吸附剂对CO2的吸附能力。与其他样品相比，用甲酸合成的渣源吸附剂（deep - csf (FA)）表现出最高的CO2吸附能力（每质量吸附剂17.0 wt%）和更好的再生能力。以脱磷渣为原料合成再生型cao基吸附剂，既环保经济，又具有较高的CO2吸附和再利用能力，有利于减少钢铁行业的CO2排放，无疑将有助于该行业的长期可持续发展。
The issue of excess slag waste generated in the iron and steel making industries has prompted investigations on the use of the slag waste. The objective of this study is to develop an adsorbent capable of capturing carbon dioxide (CO2) by using waste slag. A mesoporous CaO-Fe2O3-SiO2 (CFS) composite was synthesized from a dephosphorization steel slag, using Pluronic 123 as a template and various acids, including formic acid (FA), hydrochloric acid (HCl), and nitric acid (HNO3). The morphological and physicochemical features of the pre-pared samples were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), X-ray photoelectron spec-troscopy (XPS), and N2 adsorption-desorption measurements. The capability of the adsorbent to capture CO2 was investigated in repeated CO2 adsorption cycles. In comparison to other samples, the slag-derived adsorbent synthesized using formic acid (deP-CSF(FA)) exhibited the highest CO2 adsorption capacity (17.0 wt% per mass of adsorbent) and better regenerative ability. A regenerative CaO-based adsorbent synthesized from a dephos-phorization slag that is environmentally friendly and economical, as well as having a high capacity for CO2 adsorption and reuse, is advantageous for reducing CO2 emissions from the iron and steel making industry and will undoubtedly contribute to the industry's long-term sustainability.