摘要
用分光光度法研究了NaOCl氧化降解废水中氮基三乙酸(NTA)的反应动力学。在NTA过量的条件下测得该反应对于NaOCl为一级反应。在298K、pH=3.8时,一级反应的表现速率常数为2.2×10^(-4)s^(-1)。并考察了反应介质的酸碱性对反应速率的影响。在计量化学、产物分析和反应动力学的基础上探讨了可能的反应机理。论述了用NaOCl作氧化剂的优越性和实用性。
Reaction kinetics of the oxidative degradation of nitrilo-triacetic acid (NTA) by NaOCl was investigated spectrophotometri-cally. This reaction was of first order for NaOCl with the NTA in ex-cess. The observed pseudo-first-order rate constant was 2.2×10^(-4)s^(-1)at 298 K and pH=3. 8. The effect of media acidity on rate constantwas discussed. The mechanism may be proposed on the basis of stoi-chiometry, products analysis and kinetics. Also, the superiority andpracticality of NaOCl as oxidant were stated herein.
关键词
氧化降解
反应动力学
氮基三乙酸
nitrilotriacetic acid (P)
oxidative degradation
reaction kinetics mechanism
sodium hyochlorite
