Preparation Of Bismuth Based Magnetic Photocatalyst And Degradation Of Butyl Xanthate

With the development of industry,the scale of mining has gradually expanded,the use of flotation agents increased.In the region of mining area toxicity chemical residues in the flotation wastewater caused to the deterioration of the ecological environment.Xanthate is the most commonly used and the most effective sulfide ore collector,so the study is very important to process xanthate where in the flotation wastewater.The photocatalytic oxidation method has attracted much attention because of the good treatment effect in the organic wastewater.However,the photocatalyst is difficult to reuse and easily lose,which limits its practical application.The magnetic composite photocatalyst has the advantages of magnetic and photocatalytic activity,which can be separated from the reaction system.The cost of wastewater treatment will be reduced for the photocatalyst reused.This kind of technology will have a good application prospect.Our study focused on the preparation of the new magnetic composite photocatalyst MgFe₂O₄/Bi₂WO₆ and MgFe₂O₄/Bi₂ MoO₆ and its photocatalytic effect on butyl xanthate.Finally,the prepared MgFe₂O₄/Bi₂WO₆ was applied to an improved magnetic fixed film photocatalytic reactor for butyl xanthate degradation.The main studies and results are as follows:?1?The flower-like morphology MgFe₂O₄/Bi₂WO₆ magnetic composite photocatalyst was successfully prepared by hydrothermal method.The photocatalytic activity of 10 wt% MgFe₂O₄/Bi₂WO₆ is the best,indicating that the proper amount of MgFe₂O₄ can improve the photocatalytic activity of Bi₂WO₆.The effects of the dosage of photocatalyst,the initial concentration of butyl xanthate and the p H on the photocatalytic degradation were investigated.The results showed that the dosage and the initial concentration had great effect on the photodegradation of butyl xanthate,and the effect of p H was less.When the initial concentration of butyl xanthate was 50 mg/L and the dosage was 0.5 g/L,the degradation rate of butyl xanthate can reach 96% after 120 min illumination.The degradation rate of butyl xanthate was still 92% after 5 times of repeated use,which indicated that MgFe₂O₄/Bi₂WO₆ had good stability and could be recycled.?2?MgFe₂O₄/Bi₂ MoO₆ magnetic composite photocatalyst was successfully prepared by hydrothermal method.And the photocatalytic activity of 10 wt% MgFe₂O₄/Bi₂ MoO₆ was the best,indicating that the proper amount of MgFe₂O₄ could improve the photocatalytic activity of Bi₂ MoO₆.The results showed that when the initial concentration of butyl xanthate was 50 mg/L and the dosage was 0.2 g/L,the degradation rate of butyl xanthate can reach more than 80% after 120 min illumination.The effects of the dosage of photocatalyst,the initial concentration of butyl xanthate and the p H on the photocatalytic degradation were investigated.The results showed that the dosage and the initial concentration had great effect on the photodegradation of butyl xanthate,and the effect of p H was less.The degradation rate of butyl xanthate was still 80% after 5 times of repeated use,which indicated that MgFe₂O₄/Bi₂ MoO₆ had good stability and could be recycled.?3?The photocatalytic performance of MgFe₂O₄/Bi₂WO₆ was better than MgFe₂O₄/Bi₂ MoO₆.MgFe₂O₄/Bi₂WO₆ was applied to the photocatalytic reactor of magnetic fixed film.The effects of hydraulic retention time,light intensity and the initial concentration of butyl xanthate on the photocatalytic effect of the reactor were investigated by continuous influent water.The results showed that the hydraulic retention time had the greatest effect on the degradation effect of butyl xanthate.The results showed that when the initial concentration of butyl xanthate was 50 mg/L,the hydraulic retention time was 49 min,and the intensity of the light source was 2.2×105 lux,the degradation rate of the butyl xanthate can reach 98%,which indicated that the reactor had better degradation effect on butyl xanthate.