Toh-Ae Pornsiri, Timasart Napatsorn, Tumnantong Dusadee, Bovornratanaraks Thiti, Poompradub Sirilux
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
Sci Rep. 2024 Jul 24;14(1):17100. doi: 10.1038/s41598-024-67631-4.
The aims of this research were to prepare activated carbon (AC) impregnated with tetraethylenepentamine (TEPA) for use in carbon dioxide (CO) capture and to then develop the AC-TEPA sorbent with titanium dioxide (TiO) as a catalyst for photocatalytic reduction. The AC was impregnated with TEPA at three loading levels (2.5, 5, and 10% [w/w]) and then examined for its CO adsorption capacity under an ambient temperature and atmospheric pressure. The use of 5% (w/w) TEPA-impregnated AC (AC_5T) provided the highest CO adsorption capacity and long-term operation with a regeneration ability for up to 10 cycles. Then, AC_5T-doped TiO (AC_5T-TiO) was prepared as a photocatalytic reduction catalyst, since the presence of carbon and nitrogen in AC_5T could reduce the band gap energy and so enhance the photocatalytic reduction. In addition, the CO-saturated AC_5T was used as a CO source that could be directly converted to valuable chemicals using the AC_5T-TiO catalyst under photocatalytic reduction. Products were obtained in both the liquid (methanol) and gaseous (methane, carbon monoxide, and hydrogen) phases. Accordingly, the challenge of this research was to make valuable products from CO and to manage waste tires, following the circular economy concept.
本研究的目的是制备浸渍四乙烯五胺（TEPA）的活性炭（AC）用于二氧化碳（CO₂）捕集，然后开发以二氧化钛（TiO₂）作为光催化还原催化剂的AC-TEPA吸附剂。将AC用三种负载量（2.5%、5%和10%[w/w]）的TEPA进行浸渍，然后在环境温度和大气压下检测其CO₂吸附容量。使用5%（w/w）TEPA浸渍的AC（AC_5T）具有最高的CO₂吸附容量和长期运行能力，可再生多达10个循环。然后，制备AC_5T掺杂的TiO₂（AC_5T-TiO₂）作为光催化还原催化剂，因为AC_5T中碳和氮的存在可以降低带隙能量，从而增强光催化还原。此外，CO₂饱和的AC_5T用作CO₂源，在光催化还原条件下可使用AC_5T-TiO₂催化剂直接转化为有价值的化学品。产物在液相（甲醇）和气态（甲烷、一氧化碳和氢气）中均有获得。因此，本研究面临的挑战是遵循循环经济理念，从CO₂中制备有价值的产品并处理废旧轮胎。
