College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410000, China.
College of Engineering and Design, Hunan Normal University, Changsha 410000, China.
J Hazard Mater. 2022 Mar 15;426:127783. doi: 10.1016/j.jhazmat.2021.127783. Epub 2021 Nov 14.
Urea-formaldehyde (UF) resin residues and the related product wastes as organic hazardous wastes are difficult to be biodegraded or recycled. In this research, a hydrothermal oxidation method using hydrogen peroxide (HO) solution has been developed for the degradation and recycling of UF resin residues. The effects of solution concentration, temperature, and time on the degradation efficiency and products of UF resin residues were studied. Under optimal conditions, i.e., 140 °C and 5 wt% HO solution, over 75% of UF resin residues was degraded after 3 h. The degradation efficiency is much higher than that of the traditional hydrothermal treatment or acid hydrolysis method. In addition, results from Fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectroscopy (GC-MS), nuclear magnetic resonance spectroscopy (NMR), and X-ray diffraction (XRD) confirmed that HO solution degrades UF resin residues to low molecular compounds, such as alcohols, methylal, and amides. This research provides a novel and high-efficient hydrothermal oxidization process for the degradation of UF resin residues, which might be a promising environmentally friendly and low-cost method for the disposal and recycling of industrial UF resin residues.
脲醛（UF）树脂残留物及其相关产品废物作为有机危险废物，难以生物降解或回收。在这项研究中，开发了一种使用过氧化氢（HO）溶液的湿热氧化方法，用于 UF 树脂残留物的降解和回收。研究了溶液浓度、温度和时间对 UF 树脂残留物降解效率和产物的影响。在最佳条件下，即在 140°C 和 5wt%HO 溶液下，3 小时后超过 75%的 UF 树脂残留物被降解。降解效率远高于传统的湿热处理或酸水解方法。此外，傅里叶变换红外光谱（FTIR）、气相色谱-质谱（GC-MS）、核磁共振光谱（NMR）和 X 射线衍射（XRD）的结果证实，HO 溶液将 UF 树脂残留物降解为低分子化合物，如醇、甲缩醛和酰胺。这项研究为 UF 树脂残留物的降解提供了一种新颖高效的湿热氧化工艺，可能是一种有前途的环保且低成本的工业 UF 树脂残留物处理和回收方法。
