3、particles ofhighairpollution.Sincethe1980s,nanoTiO2becauseitstrongperformanceofAbsorptionandscatteringof radiation,asagoodultravioletscreeningagent,Usedtopreventbaskinskincareproducts,fiber,coating,etc.Precipitationmethodand sol gelmethodareusedtosynthesisfabricateTiO2