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Mesoporous SiO2 Particles Combined with Fe Oxide Nanoparticles as a Regenerative Methylene Blue Adsorbent.
ACS Omega ( IF 3.7 ) Pub Date : 2019-06-04 , DOI: 10.1021/acsomega.9b00726
Yul Hong 1 , Byeong Jun Cha 2 , Young Dok Kim 2 , Hyun Ook Seo 1
Affiliation  

Mesoporous SiO2 adsorbents were combined with Fe oxide nanoparticles (∼10 nm) that can catalyze thermal oxidation of organic compounds at low temperatures. Fe oxide nanoparticle (∼10 nm)-incorporated SiO2 adsorbents were prepared via a temperature-regulated chemical vapor deposition method followed by a thermal annealing process. The removal efficiency and reusability of Fe oxide/SiO2 particles were examined and compared to those of bare SiO2. Upon deposition of Fe oxide nanoparticles, not only the equilibrium adsorption capacity of mesoporous SiO2 for methylene blue (MB) was improved but also the reusability of SiO2 adsorbent was increased significantly. The adsorption ability of fresh Fe oxide/SiO2 particles can be almost fully recovered by simple thermal annealing at atmospheric conditions (400 °C), whereas that of bare SiO2 reduced significantly under same conditions. In addition, full recovery of initial MB adsorption ability of Fe oxide/SiO2 can be achieved by a 100 °C annealing process. Fourier transform infrared, thermogravimetric analysis, and X-ray photoelectron spectroscopy analyses indicated that Fe oxide nanoparticles catalyzed thermal degradation of adsorbed MB molecules, resulting in the improved reusability of the Fe oxide/SiO2 adsorbent. In addition to reusability, the equilibrium adsorption capacity of mesoporous SiO2 particles for various cationic dye molecules, such as MB, malachite green, and rhodamine B, can be improved by combining Fe oxide nanoparticles.

中文翻译:

介孔SiO2颗粒与氧化铁纳米颗粒的组合作为亚甲基蓝的再生吸附剂。

介孔SiO2吸附剂与氧化铁纳米颗粒(约10 nm)结合在一起,可以在低温下催化有机化合物的热氧化。通过温度调节化学气相沉积方法,然后进行热退火工艺,制备了掺入Fe氧化物纳米颗粒(〜10 nm)的SiO2吸附剂。检查了Fe氧化物/ SiO2颗粒的去除效率和可重复使用性,并将其与裸露的SiO2进行了比较。沉积Fe氧化物纳米粒子后,不仅提高了介孔SiO2对亚甲基蓝(MB)的平衡吸附能力,而且还大大提高了SiO2吸附剂的可重复使用性。通过在大气条件下(400°C)进行简单的热退火,几乎可以完全恢复新鲜的Fe氧化物/ SiO2颗粒的吸附能力,在相同条件下,裸露的SiO2明显降低。此外,可以通过100°C的退火工艺完全恢复Fe氧化物/ SiO2的初始MB吸附能力。傅里叶变换红外,热重分析和X射线光电子能谱分析表明,Fe氧化物纳米颗粒催化了吸附的MB分子的热降解,从而提高了Fe氧化物/ SiO2吸附剂的可重复使用性。除了可重用性之外,通过结合氧化铁纳米颗粒,可以提高中孔SiO2颗粒对各种阳离子染料分子(例如MB,孔雀绿和若丹明B)的平衡吸附能力。傅里叶变换红外,热重分析和X射线光电子能谱分析表明,Fe氧化物纳米颗粒催化了吸附的MB分子的热降解,从而提高了Fe氧化物/ SiO2吸附剂的可重复使用性。除了可重用性之外,通过结合氧化铁纳米颗粒,可以提高中孔SiO2颗粒对各种阳离子染料分子(例如MB,孔雀绿和若丹明B)的平衡吸附能力。傅里叶变换红外,热重分析和X射线光电子能谱分析表明,Fe氧化物纳米颗粒催化了吸附的MB分子的热降解,从而提高了Fe氧化物/ SiO2吸附剂的可重复使用性。除了可重用性之外,通过结合氧化铁纳米颗粒,可以提高中孔SiO2颗粒对各种阳离子染料分子(例如MB,孔雀绿和若丹明B)的平衡吸附能力。
更新日期:2019-06-04
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