Saito Kazuki, Hirabayashi Yasushi, Yamanaka Shinya
Division of Applied Sciences, Muroran Institute of Technology Mizumoto-cho 27-1 Muroran 050-8585 Japan
Forest Products Research Institute, Hokkaido Research Organization Nishikagura 1-10 Asahikawa 071-0198 Japan.
RSC Adv. 2021 Oct 5;11(52):32830-32836. doi: 10.1039/d1ra06717f. eCollection 2021 Oct 4.
Graphene oxide (GO) has theoretically been identified as a candidate for adsorbing formaldehyde molecules. However, whether GO can actually serve as a scavenger for formaldehyde resin adhesives must be experimentally verified due to the complex interaction between GO and formaldehyde molecules in the presence of resin, the competition between the formaldehyde emission rate and its adsorption rate on the scavenger, and other complications. From the results from this study we experimentally demonstrate that GO synthesised by the improved Hummers' method is a powerful scavenger for a urea-formaldehyde (UF) resin. We investigate the effect of the added amount of GO on the formaldehyde emission from UF resin. The emission from the UF/GO composite resin is 0.22 ± 0.03 mg L, which is an 81.5% reduction compared to that of the control UF resin when adding 0.20 wt% GO into the UF resin. However, adding higher amounts of GO (more than 0.20 wt%) increases the formaldehyde emission and the emission approaches that of pure UF resin (1.19 ± 0.36 mg L). This is likely due to the more acidic pH of the composite, which may lead to a faster curing reaction of the UF resin and acceleration of the emission.
氧化石墨烯（GO）在理论上已被确定为吸附甲醛分子的候选材料。然而，由于在树脂存在的情况下GO与甲醛分子之间存在复杂的相互作用、甲醛释放速率与其在清除剂上的吸附速率之间的竞争以及其他复杂情况，GO是否真的可以作为甲醛树脂粘合剂的清除剂必须通过实验来验证。从本研究的结果来看，我们通过实验证明，采用改进的Hummers法合成的GO是一种用于脲醛（UF）树脂的高效清除剂。我们研究了GO添加量对UF树脂甲醛释放量的影响。当向UF树脂中添加0.20 wt%的GO时，UF/GO复合树脂的释放量为0.22±0.03 mg/L，与对照UF树脂相比减少了81.5%。然而，添加更高量的GO（超过0.20 wt%）会增加甲醛释放量，且释放量接近纯UF树脂的释放量（1.19±0.36 mg/L）。这可能是由于复合材料的pH值更酸，这可能导致UF树脂的固化反应更快并加速释放。
