Sultana Al Ibtida, Chambers Cadianne, Ahmed Muzammil M N, Pathirathna Pavithra, Reza Toufiq
Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL 32901, USA.
Nanomaterials (Basel). 2022 Oct 12;12(20):3575. doi: 10.3390/nano12203575.
Pore modulation via hydrothermal carbonization (HTC) needs investigation due to its crucial effect on surface that influences its multirole utilization of such ultraporous sorbents in applications of energy storage- hydrogen and capacitive- as well as for pollutant abatement- carbon capture and dye removal. Hence, loblolly pine was hydrothermally carbonized followed by KOH activation to synthesize superactivated hydrochars (SAH). The resulting SAHs had specific surface area (SSA) 1462-1703 m/g, total pore (TPV) and micropore volume (MPV) of 0.62-0.78 cm/g and 0.33-0.49 cm/g, respectively. The SAHs exhibit excellent multifunctional performance with remarkably high atmospheric CO capture of 145.2 mg/g and high pressure cryogenic H storage of 54.9 mg/g. The fabricated supercapacitor displayed substantial specific capacitance value of maximum 47.2 Fg at 1 A g in 6 M KOH and highest MB dye removal of 719.4 mg/g. Higher HTC temperature resulted in increased surface porosity as higher SSA, TPV benefitted H storage and MB dye removal while superior MPV favored CO capture. Moderate HTC temperature ensured higher mesopore-to-macropore volume ratio favoring electrochemical performance. Isotherm modelling of the adsorbates was compared using models: Langmuir, Freundlich, Langmuir- Freundlich and Temkin.
由于通过水热碳化（HTC）进行的孔调制对材料表面有至关重要的影响，而这种影响会左右其在储能（氢和电容应用）以及污染物减排（碳捕获和染料去除）等方面对这类超多孔吸附剂的多用途利用，因此需要对其展开研究。为此，对火炬松进行了水热碳化，随后用氢氧化钾活化，以合成超活化水热炭（SAH）。所得的SAH比表面积（SSA）为1462 - 1703 m²/g，总孔容（TPV）和微孔体积（MPV）分别为0.62 - 0.78 cm³/g和0.33 - 0.49 cm³/g。SAH展现出优异的多功能性能，大气CO₂捕获量高达145.2 mg/g，高压低温H₂存储量为54.9 mg/g。所制备的超级电容器在6 M KOH电解液中，1 A g⁻¹电流密度下的比电容最大值为47.2 F g⁻¹，对亚甲基蓝（MB）染料的最大去除量为719.4 mg/g。较高的HTC温度导致表面孔隙率增加，较高的SSA和TPV有利于H₂存储和MB染料去除，而优异的MPV则有利于CO₂捕获。适中的HTC温度确保了较高的中孔与大孔体积比，有利于电化学性能。使用Langmuir、Freundlich、Langmuir - Freundlich和Temkin模型对吸附质的等温线模型进行了比较。
