光助增强双功能UIO/ZnInS/CF复合膜对化学战剂模拟物的脱毒

Photo-assisted enhance the performance of bifunctional UIO/ZnInS/CF composite films for the detoxification of chemical warfare agent simulants

为有效防护化学战剂(Chemical Warfare Agents,CWAs),迫切需要构筑具有快速自脱毒性能的多功能织物。通过溶剂热合成法制备了UIO-66-NH_(2)/ZnIn_(2)S_(4)复合物(UIO/ZnInS),将其均匀沉积在碳纤维(Carbon Fiber,CF)表面形成UIO/ZnInS/CF三元复合膜材料;该复合膜表现出稳定的光热催化性能,可有效催化脱毒两种典型CWAs模拟物。在模拟太阳光照射下,UIO/ZnInS/CF复合膜水解脱毒有机磷神经毒剂模拟物(DMNP)的半衰期仅为4.1 min,且5次循环试验后DMNP的转化率仍保持在95%以上。同时,UIO/ZnInS/CF复合膜在无光照时可吸附脱除芥子气模拟物(CEES),其最高吸附量为173.3 mg/g,在模拟太阳光照射下吸附的CEES能被催化转化为一系列无毒或毒性更低的中间产物,这主要可归因于UIO/ZnInS复合结构高效的光催化性能。研究表明,UIO/ZnInS/CF复合膜是一种有效的自脱毒材料,可为设计用于有毒化学品防护的功能织物提供新思路。

Constructing multi-functional fabrics with fast self-detoxifying properties is highly desired for effective protection against chemical warfare agents(CWAs).In this study,UIO-66-NH_(2)/ZnIn_(2)S_(4) composites(UIO/ZnInS)were first prepared by solvothermal synthesis method,which was then deposited uniformly on the surface of carbon fiber(CF)to form UIO/ZnInS/CF ternary composite films.The as-synthesized composite films exhibit stable photothermal conversion performance,due to the presence of ZnIn2S4 component.UIO/ZnInS/CF composite films were used as versatile materials for catalytic detoxification of two CWA simulants for the first time.The experimental results demonstrate that the simulated solar light(SSL)irradiation can remarkably enhance the detoxifying performance of UIO/ZnInS/CF films.To be specific,for the nerve agent simulant DMNP,the half-life of DMNP hydrolyzing detoxification under SSL irradiation was only 4.1 min when using UIO/ZnInS/CF film as a catalyst,whereas the half-life under room light was 23.3 min.The significantly promoted catalytic performance of DMNP detoxification was primarily attributed to the instantaneous heat transfer from photothermal agent ZnIn_(2)S_(4) to the catalytically active UIO-66-NH_(2).UIO/ZnInS/CF film also exhibits good catalytic stability for DMNP hydrolyzing detoxification.Besides,the UIO/ZnInS/CF composite film can adsorb and eliminate mustard gas simulant CEES.In the droplet experiments of CEES detoxification,compared to UIO/CF and ZnInS/CF samples,UIO/ZnInS/CF film showed a maximum adsorption capacity of 173.3 mg/g in the darkness.Moreover,the adsorbed CEES can be catalytically degraded into a series of non-toxic or low-toxic intermediates under simulated solar light irradiation.It was mainly ascribed to the improved separation of photogenerated electrons and holes owing to matched energy band structure between ZnIn_(2)S_(4) and UIO-66-NH_(2),producing more active species for detoxifying CEES.The above experimental results demonstrate that UIO/ZnInS/CF composite films can be served as effective self-detoxifying materials for CWA and their simulants.This study would provide a novel idea for the design and construction of functional fabrics that protect against toxic chemicals.