أرسل هذا في رسالة قصيرة: Photocatalytic degradation of methylene blue by Zn<inf>2</inf>SnO<inf>4</inf>-SnO<inf>2</inf> system under UV visible radiation

 _    _     _____    __   __     ___     _    _   
| \  / ||  |  ___||  \ \\/ //   / _ \\  | || | || 
|  \/  ||  | ||__     \   //   / //\ \\ | || | || 
| .  . ||  | ||__     / . \\  |  ___  ||| \\_/ || 
|_|\/|_||  |_____||  /_//\_\\ |_||  |_|| \____//  
`-`  `-`   `-----`   `-`  --` `-`   `-`   `---`