School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
Bioresour Technol. 2022 Jul;355:127274. doi: 10.1016/j.biortech.2022.127274. Epub 2022 May 6.
Biochar derived from corn stalk doping with activated carbon was produced by microwave-assisted pyrolysis and applied to sorb volatile organic compounds (VOCs: benzene and o-xylene). Specific surface area (SSA), total pore volume (TPV) and micropore volume (MV) of microwave biochar increased with increasing microwave power with the maximum values 325.2 m·g, 0.181 mL·g and 0.1420 mL·g, respectively. Adsorption capacities of benzene and o-xylene on microwave biochar ranged 6.82-54.75 mg·g and 7.43-48.73 mg·g, which were separate positively related with SSA, TPV, and MV. Benzene adsorption was mainly dominated by surface interaction and partition mechanisms, while o-xylene adsorption was governed by pore filling. The adsorption capacities of microwave biochar for benzene and o-xylene decreased by only 0.30% and 0.99% on the 5th cycle that illustrated the reasonably good reusability of microwave biochar. The results of this research demonstrate that microwave biochar is a promising adsorbent for VOCs removal.
由玉米秸秆掺杂活性炭经微波辅助热解制备的生物炭，用于吸附挥发性有机化合物（VOCs：苯和邻二甲苯）。随着微波功率的增加，微波生物炭的比表面积（SSA）、总孔体积（TPV）和微孔体积（MV）均增加，最大值分别为 325.2 m·g、0.181 mL·g 和 0.1420 mL·g。微波生物炭对苯和邻二甲苯的吸附容量分别为 6.82-54.75 mg·g 和 7.43-48.73 mg·g，与 SSA、TPV 和 MV 呈正相关。苯的吸附主要由表面相互作用和分配机制主导，而邻二甲苯的吸附则由孔填充控制。在第 5 次循环中，微波生物炭对苯和邻二甲苯的吸附容量仅下降了 0.30%和 0.99%，说明微波生物炭具有较好的可重复使用性。本研究结果表明，微波生物炭是一种很有前途的 VOCs 去除吸附剂。
