Tan Jeannie Z Y, Gavrielides Stelios, Xu Hao R, Thompson Warren A, Maroto-Valer M Mercedes
Research Centre for Carbon Solutions (RCCS), Heriot-Watt University Edinburgh EH14 4AS UK
Department of Chemical Engineering, Loughborough University Loughborough UK.
RSC Adv. 2020 Jul 27;10(47):27989-27994. doi: 10.1039/d0ra05010e.
To improve the CO adsorption on the photocatalyst, which is an essential step for CO photoreduction, solid solutions were fabricated using a facile calcination treatment at 900 °C. Using various alkalis, namely NaOH, NaCO, KOH, KCO, the resulted samples presented a much higher CO adsorption capacity, which was measured with the pulse injection of CO on the temperature programmed desorption workstation, compared to the pristine Evonik P25. As a result, all of the fabricated solid solutions produced higer yield of CO under UV light irradiation due to the increased basicity of the solid solutions even though they possessed only the rutile polymorph of TiO. The highest CO adsorption capacity under UV irradiation was observed in the sample treated with NaOH, which contained the highest amount of isolated hydroxyls, as shown in the FTIR studies.
为了提高光催化剂对CO的吸附，这是CO光还原的关键步骤，通过在900℃下进行简便的煅烧处理制备了固溶体。使用各种碱，即NaOH、NaCO、KOH、KCO，与原始的赢创P25相比，所得样品表现出更高的CO吸附容量，这是在程序升温脱附工作站上通过脉冲注入CO测量的。结果，尽管所有制备的固溶体仅具有TiO的金红石多晶型，但由于固溶体碱性的增加，在紫外光照射下它们都产生了更高的CO产率。在FTIR研究中表明，在用NaOH处理的样品中观察到了紫外照射下最高的CO吸附容量，该样品含有最高量的孤立羟基。
