Valorization of waste polyethylene terephthalate plastic into N-doped microporous carbon for CO2 capture through a one-pot synthesis

Sustainability-inspired upcycling of waste polyethylene terephthalate plastic into porous carbon for CO2 capture

“…The first porous carbon, PET6-CO 2 -9, was synthesized by CO 2 activation at 900 °C for 2 h under a CO 2 flow rate of 200 mL min −1 . The second porous carbon, PET6-K7, 18 was prepared by KOH activation at 700 °C for 1 h under a N 2 flow rate of 200 mL min −1 , and the mass ratio of KOH : PET6 was 2 : 1. The third porous carbon, PET6-KU7, 18 was developed using a one-pot synthesis method at 700 °C for 1 h under a N 2 flow rate of 200 mL min −1 , with the mass ratio of KOH : urea : PET6 set at 2 : 1 : 1.…”

Transforming Plastic Waste into Porous Carbon for Capturing Carbon Dioxide: A Review

“…For example, to determine the chemical bonding states (or oxidation state) of the elements and the compounds [94]. The high oxygen functional groups provide basic active sites on the adsorbent and thus enhance the affinity towards CO 2 binding, resulting in high CO 2 adsorption and effective CO 2 capturing [18,19,95]. This can be confirmed based on the XPS spectra whereby a peak at 532 eV is associated with oxygen atoms in the carboxylic groups (O1s) that form Lewis base sites on the surface of the pores and beneficial to CO 2 binding [19].…”

“…Similarly, Kaur et al [96] also highlighted that PET carbonized samples without a chemical activation showed a low amount of oxygen and low adsorption capacity, thus decreasing its attraction towards acidic CO 2 gas. Yuan et al [95] prepared a PET-derived microporous carbon using two activation methods of one-pot and two-pot synthesis. For one-pot synthesis, the carbonized PET was impregnated with KOH and urea simultaneously.…”

“…For the carbonized PET-KOH sample, the average Qst value obtained was at −12.08 kJ/mol, and the value tends to be more negative with changes in the temperature, demonstrating the exothermic nature of the adsorption process [90]. Yuan et al [95] also used waste PET to convert the waste into char using the carbonization process to produce porous carbon material and then modified the surface properties of the porous carbon with a mixture of KOH and urea. The modified sample was used as an adsorbent to capture CO 2 .…”

Use of dirty plastic waste as precursors for activated carbon production—A contribution to the circular economy

“…It was previously reported the use of clean plastic waste, in most of the cases from a specific polymer, for the production of carbon materials, such as graphene mesoporous carbon for high-voltage supercapacitors application and energy conversion (Lian et al, 2019), N-doped microporous carbon for CO 2 capture (Yuan, Li, et al, 2020), porous carbon for CF 4 adsorption (Yuan, Cho, et al, 2020), molybdenum carbide carbon nanocomposites (Mir & Pandey, 2019) and activated carbon (Belo et al, 2017;Cansado et al, 2010;Liu et al, 2015).…”