Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
Bioresour Technol. 2024 Feb;393:130085. doi: 10.1016/j.biortech.2023.130085. Epub 2023 Nov 20.
To customize biochar suitable for efficient adsorption of benzene derivatives, this study presents programmed microwave pyrolysis to produce hydrophobic porous biochar with low-dose ferric chloride. Designated control of the ramping rates in the carbonization stage and the temperatures in the activation stage were conducive to enlarging the specific surface area. Iron species, including amorphous iron minerals, could create small-scale hotspots during microwave pyrolysis to promote microporous structure development. Compared with conventional pyrolysis, programmed microwave pyrolysis could increase the specific surface area from 288.6 m g to 455.9 m g with a short heating time (15 min vs. 2 h) under 650 °C. Engineered biochar exhibited higher adsorption capacity for benzene and toluene (136.6 and 94.6 mg g), and lower adsorption capacity for water vapour (6.2 mg g). These findings provide an innovative design of engineered biochar for the adsorption of volatile organic compounds in the environment.
为了定制适合高效吸附苯衍生物的生物炭，本研究采用程序升温微波热解技术，用低剂量的三氯化铁制备出疏水性多孔生物炭。碳化阶段升温速率和活化阶段温度的控制有利于扩大比表面积。在微波热解过程中，铁物种（包括无定形铁矿物）会产生小规模的热点，从而促进微孔结构的发展。与常规热解相比，程序升温微波热解可在 650°C 下，在 15 分钟的短加热时间内，将比表面积从 288.6 m g 增加到 455.9 m g。工程化生物炭对苯和甲苯（136.6 和 94.6 mg g）的吸附容量更高，对水蒸气的吸附容量（6.2 mg g）更低。这些发现为环境中挥发性有机化合物的吸附提供了一种新型工程化生物炭的设计思路。
