Kitjanukit Nutkamol, Neamsung Wannisa, Karawek Apisit, Lertthanaphol Napat, Chongkol Napatr, Hiramatsu Koki, Sekiguchi Tomoya, Pornsuwan Soraya, Sakurai Takahiro, Jonglertjunya Woranart, Phadungbut Poomiwat, Ichihashi Yuichi, Srinives Sira
Department of Chemical Engineering, Faculty of Engineering, Mahidol University Nakhon Pathom 73170 Thailand
Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University Rokkodai-cho 1-1, Nada Kobe 657-8501 Japan.
RSC Adv. 2024 Sep 2;14(38):27980-27989. doi: 10.1039/d4ra04585h. eCollection 2024 Aug 29.
Carbon dioxide (CO) photoreduction is an intriguing approach that converts CO into high-value substances with the assistance of a photocatalyst. Key to effective photoreduction is to promote the interaction of photo-induced holes and a sacrificial reagent (SCR), separating the holes from photoelectrons and enhancing the rate of the subsequent product generation. Methanol, ethanol, isopropanol, and water SCRs were tested for their ability to assist a copper-doped sodium dititanate nanosheets/graphene oxide heterostructure (CTGN) in CO photoreduction. The CTGN photocatalyst was suspended in a CO-saturated aqueous solution with the assigned SCR while illuminated by a mercury lamp. Product samples from the gas and liquid phases were analyzed for targeted product compositions. Methanol SCR exhibited the best performance in facilitating CO photoreduction, producing ethanol as the main product at a total carbon consumption (TCC) of 6544 μmol g . The remarkable performance of methanol is attributed to the high diffusivity and excellent stability of the hydroxymethyl radical that developed during the photoreduction. The kinetics studies revealed the first and second order for the CO depletion and product generation rates, respectively, for the alcohol SCRs.
二氧化碳（CO）光还原是一种引人关注的方法，它借助光催化剂将CO转化为高价值物质。有效光还原的关键在于促进光生空穴与牺牲试剂（SCR）的相互作用，使空穴与光电子分离，并提高后续产物生成的速率。测试了甲醇、乙醇、异丙醇和水作为牺牲试剂协助铜掺杂二钛酸钠纳米片/氧化石墨烯异质结构（CTGN）进行CO光还原的能力。将CTGN光催化剂悬浮在含有指定牺牲试剂的CO饱和水溶液中，同时用汞灯照射。对气相和液相的产物样品进行分析，以确定目标产物组成。甲醇作为牺牲试剂在促进CO光还原方面表现出最佳性能，以6544 μmol g的总碳消耗量（TCC）产生乙醇作为主要产物。甲醇的卓越性能归因于光还原过程中形成的羟甲基自由基的高扩散率和出色稳定性。动力学研究表明，对于醇类牺牲试剂，CO消耗速率和产物生成速率分别符合一级和二级反应动力学。
