废磷酸三异戊酯有机溶剂的间接电化学氧化分解行为研究

银媒介间接电化学氧化(Ag/MEO)技术是一种有机溶剂分解破坏的有效方法。本文采用小型氧化电解池和新鲜磷酸三异戊酯（TiAP）有机溶剂模拟研究了在含Ag+的HNO₃溶液体系中氧化分解TiAP，包括电解氧化过程中阳极室HNO₃浓度、操作温度等条件对Ag²⁺产生量的影响，以及影响Ag²⁺氧化分解TiAP有机溶剂的相关因素。研究结果表明，溶液中Ag⁺和HNO₃浓度的提高有利于Ag²⁺的生成；操作温度的升高，不利于Ag²⁺的生成。最佳条件为：温度，40 ℃；HNO₃浓度，8 mol/L；电流密度，0.5 A/cm²。在此条件下，8 h可将99.9%的TiAP氧化分解。

Study on Mediated Electrochemical Oxidation for Destruction of Spent TiAP Solvent

A silver mediated electrochemical oxidation is a promising technique for the destruction of organic compounds. The destruction of spent organic solvent in nitric acid medium containing Ag⁺ was studied by using a laboratory scale electrochemical oxidation cell and fresh 30% tri-isoamyl phosphate (TiAP). The factors affecting the generation of Ag²⁺ and its capability to decompose TiAP were investigated, which include temperature, nitric acid concentration and current density. The results show that the generation of Ag²⁺ increases with the concentrations of HNO₃ and Ag⁺ and reduces with the increase of temperature. It is also found that the destruction rate of TiAP is 99.9% with a temperature of 40 ℃, a nitric acid concentration of 8 mol/L , and a current density of 0.5 A/cm² for 8 h.