TiO2气溶胶快速去除空气中的芥子气模拟剂

在自制反应器内,通过喷射法将纳米TiO_2分散成气溶胶形式,用以降解空气中的芥子气模拟剂二乙基硫醚(DES)。利用自行设计的一套气溶胶沉降行为评价装置,对TiO_2气溶胶的释放条件进行了优化。系统研究了相对湿度、反应温度、光强、催化剂加入量、反应物浓度等因素对DES降解速率和彻底矿化速率的影响。结果表明:TiO_2气溶胶对2.80 mg/L(近似芥子气快速致死浓度)DES降解的半衰期由涂覆型TiO_2的34.5 min缩短至8.5 min;TiO_2气溶胶光催化降解DES的最佳相对湿度为35%,此时CO_2最快生成速率可达34.64μg/(L·min),150 min内彻底矿化比例达66.1%;对于1.5 L反应器,催化剂加入量为30 mg时降解DES的量效比达到最佳状态;TiO_2气溶胶光催化适用于含低浓度DES空气的快速净化。

Quick removal of mustard gas simulant from air by TiO2 aerosol

In a self-made reactor,the nano TiO₂ aerosol was formed by spraying to degrade diethyl sulfide （DES） in air. A new device was designed to evaluate the deposition behavior of TiO₂ aerosol and the release conditions of TiO₂ aerosols were optimized. The factors affecting the degradation rate and complete mineralization rate of DES were systematically investigated,such as：relative humidity,reaction temperature,light intensity,catalyst amount and reactant concentration. The results showed that：The half-life of 2.80 mg/L （approximate to the rapid lethal concentration of mustard gas） DES in degradation was decreased from 34.5 min by coated type TiO₂ to 8.5 min by TiO₂ aerosol;The best relative humidity for DES degradation by TiO₂ aerosol was 35%,while the fastest CO₂ generation rate reached 34.64 μg/（L·min） and the complete mineralization ratio reached 66.1% after 150 min;The best dose-effect ratio for DES degradation could be achieved with 30 mg TiO₂ aerosol in 1.5 L reactor;The TiO₂ aerosol photocatalysis process was suitable for rapid decontamination of air with low concentration DES.