紫外光谱法探讨偏二甲肼废水氧化降解机理

Oxidative Degradation Process of Unsymmetrical Dimethylhydrazine Wastewater by UV Spectroscopy

针对目前偏二甲肼(UDMH)降解方法存在中间产物毒性高、难降解的问题,建立了跟踪、分析UDMH废水氧化降解产物的紫外光谱检测方法。确立了UDMH降解过程中产物峰的归属。解析了Cu2+/H2O2和Fenton两种氧化体系的降解产物,推测了降解反应机理。结果表明:UDMH和偏腙(FDMH)的紫外峰值分别在200 nm和235 nm。两种体系可有效地降解UDMH废水,但Cu2+/H2O2体系中间产物较多、毒性较大。先加入H2O2较先加入Cu2+能减少中间产物。铁粉的加入有利于中间产物的减少。Fenton体系能有效地抑制有毒中间产物的产生。

Aiming at the problems on high toxic and hard degradable intermediates existing in unsymmetrical dimethylhydrazine（ UDMH）degradation method at present,a detection method of ultraviolet（ UV） spectroscopy to trace and analyze the oxidative degradation products of UDMH wastewater was established. The assignation of product peaks in UDMH wastewater degradation process was determined. The degradation products of two oxidation systems Cu2＋/ H2O2 system and Fenton system were analyzed. The degradation mechanism was deduced. Results show that the UV peaks of UDMH and unsymhydrazone（ FDMH） are at 200 nm and 235 nm,respectively. Two systems can effectively degrade UDMH wastewater,but Cu2＋/ H2O2 system has more intermediate products and higher toxicity. The addition of H2O2 before adding Cu2＋can reduce intermediates. The addition of iron powder is beneficial to decrease intermediates. Fenton system can effectively inhibit the producing of toxic intermediate products.