DECP在TiO_2上的热降解与光催化降解

以沙林模拟剂——氯磷酸二乙酯(DECP)在P25TiO2上的热降解反应和光催化降解反应,通过原位红外光谱(In situ IR)和气相色谱-质谱联用(GC-MS)等方法考察两种降解反应过程.证实DECP的热降解产物主要包括:DEHP(Diethyl hydroxyphosphonate),TEPP(Tetraethly pyrophosphate)和TEP(Triethyl phosphate)等.光催化反应过程中气相降解产物中除了有DEHP,TEP和TEPP以外,还发现了CO2,CO,H2O,HCl,甲烷,乙醇,乙醛和微量的DEP(Diethyl phosphite)等.DECP的降解机理,其光催化反应由脱氯,P—O—R键断裂,C—C键断裂和含磷基团的重组等复杂过程构成,最终转化为CO2,H2O和HCl等无机产物.

TiO2悬浮态体系光催化降解邻苯二甲酸乙酯的研究

以锐态型TiO2为催化剂，在波长为365nm的紫外灯（125W）照射下，加入H2O2降解内分泌干扰物质邻苯二甲酸乙酯（DEP），分别研究了pH值，H2O2的加入量，邻苯二甲酸乙酯的初始浓度，以及光照时间对DEP的降解效果。结果表明：在pH=2.50mg／L的H2O2中。对初始浓度为50mg／L的邻苯二甲酸乙酯溶液光照120min，有较好的降解效果。

DECP在纳米TiO_2上气-固相光催化的FT-IR和GC-MS研究

FT-IR spectroscopy online was used to investigate DECP(Diethyl chlorophosphite)degraded by photocatalytic oxidation on nano-TiO2(P25).GC-MS spectrograph was used to analyze the products.It is possible to predict the mechanism of gas-solid phase photocatalytic degradation of DECP.The reaction may be take place by follow pathway:electron-hole couple was produced in illuminated TiO2 by UV irradiated,and the couple evoke reactions with DECP,H2O,-OH to produce various radicals.DECP can be degraded to inorganic compounds by the chain-reaction of radicals.The products include CO2,H2O,CO,HCl,et al.The chain-reaction will be terminated when radicals vanish,and the intermediates were produced,such as methane,alcohol,ethanal,DEHP(Diethyl hydroxyphosphonate),DEP(Diethyl phosphate),TEP(Triethyl phosphate),et al.