硅藻土的分离及其负载氧化铁后光催化抗菌性能研究

Separation of Diatomite and Photocatalytic Bactericidal Property of Diatomite Loaded with Fe_2O_3

采用饱和蔗糖溶液为溶剂,通过低速离心,可去除硅藻土中的杂质和破碎小颗粒,对其进行纯化分离。同时研究了不同煅烧温度对硅藻土比表面积和表面化学性质的影响。结果表明,600℃以下煅烧对硅藻土的比表面积影响甚小,800℃以上温度煅烧不仅明显降低其比表面积,而且可除去硅藻土表面羟基。当硅藻土表面负载上一定浓度的Fe2O3纳米颗粒后,其在可见光下的光催化抑菌率可达到96.2%。

Diatomite can be separated by wiping off impurities and fragments by means of selecting saturated sucrose solution as solvent and centrifuging at lower speed. The influence of calcination temperatures on diatomite was also investigated, which revealed that the calcination temperature below 600℃ makes little difference to the specific sur- face area of diatomite. When the calcination temperature is higher than 800℃, the specific surface area of diatomite can be obviously reduced, and the hydroxyl on diatomite surface can be removed. When diatomite was loaded with certain concentration of Fe2O3 nanoparticles, its photocatalytic bacterial inhibition rate can up to 96.2% in visible light irradiation.