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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。
The reaction kinetics of NaOCl oxidative degradation of nitrilotriacetic acid (NTA) in waste water was studied spectrophotometrically. The reaction was found to be a first order reaction for NaOCl in the presence of excess NTA. At 298K and pH = 3.8, the rate constant of the first order reaction is 2.2 × 10 ~ (-4) s ~ (-1). The effects of pH value and reaction time on the reaction rate were investigated. The possible reaction mechanism was explored on the basis of metrology chemistry, product analysis and reaction kinetics. The superiority and practicability of using NaOCl as oxidant are discussed.