Electrodeposition of xanthate on electric heating tube and photocatalysis

Electrodeposition of xanthate on electric heating tube and photocatalysis

Xanthate method

In the 1970s, the United States developed a new type of insoluble heavy metal ion remover ISX, which is convenient to use and has low water treatment costs. ISX not only can remove various heavy metal ions, but also can reduce Cr6+to Cr3+under acidic conditions, but its stability is poor. The insoluble starch xanthate has good chromium removal effect, the removal rate is>99%, the residue is stable, and will not cause secondary pollution. Zhong Changgeng and others made rice straw xanthate instead of starch to treat chromium containing wastewater. The removal rate of chromium is high and it is easy to meet the discharge standard. The researchers believe that the removal of chromium from rice straw xanthate is the joint action of chromate xanthate and chromium hydroxide through precipitation and adsorption, but chromate xanthate plays a major role. This method has low cost, rapid response, simple operation, and no secondary pollution.

Photocatalytic method

Photocatalysis is a new method that has rapidly developed in recent years in the treatment of organic pollutants in water, especially in the use of semiconductors as catalysts. There have been many reports on the treatment of organic pollutants in water. Using semiconductor oxide (ZnO/TiO2) as a catalyst, electroplating wastewater containing chromium was treated using a solar light source. After 90 minutes of sunlight (1182.5W/m2), hexavalent chromium was reduced to trivalent chromium, and trivalent chromium was removed in the form of chromium hydroxide. The chromium removal rate reached over 99%.

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