One-Pot Mechanochemical Synthesis of Carbons with High Microporosity and Ordered Mesopores for CO₂ Uptake at Ambient Conditions

Abstract

Mechanochemical synthesis of ordered mesoporous carbons with tunable mesopores and well-developed irregular microporosity is investigated. This synthesis was carried out by the self-assembly of ecofriendly chemicals such as tannin and glyoxal used as carbon precursors, and triblock copolymer as a soft templating agent. The structural properties of the resulting carbons were tailored by using different block copolymers (Pluronic F127, and P123) as soft templates. The various weight ratios of tannin and block copolymer were employed to tune the textural properties of these carbons. The tannin: Pluronic F127 ratios (1:0.75, 1:1, 1:1.1) gave the ordered mesoporous carbons among a wide variety of the samples studied. The ordered mesoporosity was not observed in the case of Pluronic P123 templated mesoporous carbons. The CO2-activated carbon samples obtained for both Pluronic templates showed a high specific surface area (close to 900 m2/g), large pore volume (about 0.6–0.7 cm3g−1), narrow pore size distribution, and high CO2 uptake of about 3.0 mmol g−1 at 1 bar pressure and ambient temperature.

Keywords

• mechanochemical synthesis
• self-assembly
• block copolymer templating
• CO₂ uptake