Lu Yutong, Shen Yulin, Zhang Shifeng, Li Jianzhang, Fu Yuejin, Huang Anmin
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
ACS Omega. 2021 Feb 16;6(8):5945-5952. doi: 10.1021/acsomega.1c00126. eCollection 2021 Mar 2.
Since traditional methods for removing volatile organic compounds (VOCs) from wood consume large amounts of energy and generate environmental pollution, it is desired to develop a convenient and green treatment method. Oxidation by microwave-activated persulfate (MW-PS) is a promising alternative method that has been used to eliminate VOCs from wood. The penetration of microwave energy can destroy the wood pit membranes and increase VOC emissions. The VOCs are further degraded by ·OH and SO , which are generated the activation of microwaves. This phenomenon can be detected by the electron paramagnetic resonance spectrometry. The 35 types of main VOCs of natural wood were determined, including alkanes/terpenes, alcohols/ethers, esters, aldehydes/ketones, and others. In the MW-PS system, 23 compounds were removed with an efficiency of 100%. Specifically, as one of the major compounds, the content of alkanes/terpenes was sharply decreased, and no alcohols/ethers and esters were detected. It was found that the optimal conditions of the MW-PS system for the minimum release of VOCs from wood were the microwave power of 462 W, irradiation time of 30 min, and PS dosage of 0.5 mmol/L.
由于传统的从木材中去除挥发性有机化合物（VOCs）的方法消耗大量能源并产生环境污染，因此需要开发一种便捷且绿色的处理方法。微波活化过硫酸盐（MW-PS）氧化是一种很有前景的替代方法，已被用于从木材中消除VOCs。微波能量的穿透可以破坏木材的纹孔膜并增加VOCs的排放。VOCs会被微波活化产生的·OH和SO进一步降解。这种现象可以通过电子顺磁共振光谱法检测到。确定了天然木材的35种主要VOCs，包括烷烃/萜烯、醇/醚、酯、醛/酮等。在MW-PS体系中，23种化合物的去除率达到100%。具体而言，作为主要化合物之一，烷烃/萜烯的含量急剧下降，且未检测到醇/醚和酯。研究发现，MW-PS体系使木材中VOCs释放量最小的最佳条件为微波功率462 W、辐照时间30 min和PS用量0.5 mmol/L。
