一步热分解法形成的MoO_(3)在无光条件下的抗菌性能

Antibacterial Properties of MoO_(3) Formed by One-Step Thermal Decomposition Under the Absence of Light

生物污损是威胁海工材料安全高效服役的重要因素,因此开发环保、成本低廉的防污材料非常必要。通过一步热分解法分别在450和750℃制备α-MoO_(3)粉末材料,即S450和S750。采用XRD、SEM、FTIR对样品进行表征。结果显示,450和750℃获得的α-MoO_(3)分别表现为纳米级板状结构和微米级长板状结构。利用平板计数法评价2种材料在无光条件下对铜绿假单胞菌(P.aeruginosa)的抗菌性能。结果显示,S450和S750在浓度为0.25、0.5、0.75,和1 mg/mL时,其抗菌率分别为27.3%、99%、100%、100%和16.1%、30.1%、52.3%、73.6%。表明2个条件下获得的α-MoO_(3)在无光条件下均表现出良好的抗菌性能,并且溶液pH值随α-MoO_(3)浓度的升高而降低,Mo离子溶出量随α-MoO_(3)浓度的升高而增加。α-MoO_(3)在无光条件下的抗菌活性源于H3O+和Mo离子溶出的协同作用影响。与S750相比,S450表现出更高的抗菌率,这可能源于S450在溶液中具有更高的溶解度,因而导致更多的H3O+和Mo离子溶出。

Biofouling is an important factor threatening the safe and efficient service of marine engineering materials,so it is of great significance to develop efficient,environmentally friendly,and low-cost antifouling materials.In this research,two kinds ofα-MoO_(3) powder materials were prepared by one-step thermal decomposition at 450 and 750°C,which are designated as S450 and S750,respectively.The samples were analyzed by XRD,SEM,and FTIR.Results show that theα-MoO_(3) obtained at 450 and 750°C shows nanoscale plate-like structure and micron-sized long plate-like structure,respectively.Plate counting was used to evaluate the antimicrobial effects of two materials on pseudomonas aeruginosa(P.aeruginosa)under the condition of absence of light.Results show that the antibacterial rates of S450 and S750 specimens at Mo ion concentrations of 0.25,0.5,0.75,and 1 mg/mL are 27.3%,99%,100%,100%and 16.1%,30.1%,52.3%,73.6%,respectively,indicating that bothα-MoO_(3) obtained under two conditions show good antibacterial properties in the absence of light.The pH value of the solution is decreased with increasing of theα-MoO_(3) concentration,and the concentration of Mo ions is increased with increasing of theα-MoO_(3) concentration.The antibacterial activity ofα-MoO_(3) in the absence of light is attributed to the synergistic effect of dissolution of H3O+and Mo ions.Compared with S750 specimen,S450 specimen exhibits higher antibacterial rate,which may be due to its higher solubility,resulting in the more release of H3O+and Mo ions.