Study on discolouration of methylene blue by lixivium of removing iron

The experiment investigated decoloration rate of the mixed solution under visible light, which was consisted of lixivium and dye solution. The lixivium was got through the process of purifying silica sand by the means of ultrasonic treatment. Meanwhile, the effect of the concentration of ethanedionic acid, time of treatment by ultrasound, the initial concentration of dye solution and the volume of lixivium were studied in details. The result showed that after mixed the lixivium with dye solution, it was apparent in decoloration efficiency. The decoloration rate had achieved more highly after irradiation. Under the condition of c[H₂C₂O₄] 5g/L, treating by ultrasonic for 2.5h, using 30mL lixivium, the decoloration rate of mixed solution containing 20 ppm methylene blue was about 99.5%. And it also had certain affection for the COD_Cr removing rate of lixivium.