Route‐Optimized Synthesis of Bagasse‐Derived Hierarchical Activated Carbon for Maximizing Volatile Organic Compound (VOC) Adsorption Capture Properties

Abstract

The deep exploration of adsorption preferential specific structural properties of waste biomass‐derived activated carbon(AC) adsorbent is significant but challenged in the light of the synthetic control. This work optimizes chemical activation routine of waste bagasse‐derived AC to fabricate high‐performance adsorbent. The resultant optimal AC affords outstanding structural properties (SBET=2832.2 m2 g−1, SLang=5478.3 m2 g−1, Vtotal=1.93 cm3 g−1). The pre‐carbonization method (using high‐temperature calcination or hydrothermal) and the implanting approach of KOH (impregnation or grinding method) were rationally tuned, and the corresponding effect on structural properties of AC and their adsorption capacity for volatile organic compounds(VOCs) were carefully studied for the first time. The obtained optimal BC‐1 adsorbent showed the highest adsorption capacity (1604.5 mg g−1 and 1679.5 mg g−1) of benzene and toluene, which is nearly 1.73 folds enhancement compared to others derived from comparative routes. This adsorption property is far superior to that of industrial AC. Meanwhile, the adsorption capacity and adsorption behavior were further demonstrated to be directly determined by the total pore volume and Langmuir surface area of the adsorbent through correlating adsorption properties with structural characters. Besides, we demonstrated the superior adsorption selectivity of C6H6/H2O(g) (61.22) and C7H8/H2O(g) (189.33) over BC‐1 under humid conditions predicted by the DIH (difference of the isosteric heats) equation.

Amidation‐Reaction Strategy Constructs Versatile Mixed Matrix Composite Membranes towards Efficient Volatile Organic Compounds Adsorption and CO2 Separation

“…[ 40 ] It is also found that the Q st of methanol decreased with the increase of adsorption, illustrating that the interaction between methanol and UiO‐66‐NA@PDMS/MCE decreased gradually due to the multilayer adsorption effect. [ 41 ]…”

“…[40] It is also found that the Q st of methanol decreased with the increase of adsorption, illustrating that the interaction between methanol and UiO-66-NA@PDMS/MCE decreased gradually due to the multilayer adsorption effect. [41] The interaction between VOCs and UiO-66-NA@PDMS/MCE can be analyzed from three aspects (Figure 6a), including the open metal sites on MOFs, the functional groups on the MOFs and/or polymers via mutual interactions, and MOF nanocrystals via electrostatic interactions. [42] Especially, UiO-66-NA@PDMS/MCE produced extensive adsorption capacity also due to its inherent porosity of 65.3% (Table S2, Supporting Information) for adsorbing VOCs, and the chemical functional groups encompassed within the UiO-66-NA@PDMS/MCE show a profound influence over the adsorption of VOCs.…”

Rare Earth Dopants Enhance Thermocatalytic Activity of Manganese Oxides on Corrugated Silica Carriers for Formaldehyde Degradation

“…[6] The efficient detection and elimination of HCHO molecules remains a great challenge. [7,8] Several cleaner strategies have been used for HCHO elimination, including physical adsorption, [9,10] photocatalysis, [11] and thermocatalytic oxidation. [12,13] Thermocatalytic oxidation technology is especially fit to purify industrial waste gas with the temperatures around 200 °C.…”

Preparation of high-performance activated carbons from hemicellulose pre-extracted residues of poplar and their application in VOCs removal

“…Additionally, a lot of research has focused on optimizing the preparation process of activated carbon to improve VOCs adsorption capacity. Yang et al (2021) studied the effect of the chemical activation process on the adsorption capacity of VOCs by properly adjusting the pre-carbonization method and the injection method of KOH. Zhu et al (2018) prepared activated carbon from corncob waste residue and studied the effects of carbonization temperature, impregnation ratio, and carbonization time on the structure and chemical properties of activated carbon.…”