微波辅助球磨还原含Cr(Ⅵ)废水的研究

Chromium Reduction from Cr(Ⅵ) Polluted Wastewater with Microwave-assisted Ball Milling

通过微波辅助球磨法还原含Cr(Ⅵ)废水及单因素法观察铁球质量的改变、还原铁粉量、pH值对还原Cr(Ⅵ)的影响.实验结果表明,球料比和还原铁粉量越大,pH值越小,Cr(Ⅵ)的还原速度越快.在中性溶液中,通过微波辅助球磨,能在55min内,将六价铬质量浓度从50mg/L还原到0.473 mg/L,产物经XRD和XPS检测为FeCr2O4;当pH=2时,将初始质量浓度为300mg/L的含Cr(Ⅵ)废水还原到0.5mg/L以下只需6min,所以采用微波辅助球磨装置能够高效处理含Cr(Ⅵ)的工业废水.

Microwave-assisted ball milling was employed to reduce Cr （VI） in wastewater, and single factor method was used to observe the change of the iron ball quality, the amount of reduced iron powder and the effect of pH on the reduction of Cr （VI）. These experimental results show that the greater the ball material ratio and the amount of reduced iron powder, the smaller the pH, the faster the reduction speed of Cr （VI）. In the neutral solution, through microwave-assisted ball milling, the concentration of Cr （VI） can be reduced from 50 mg/L to 0.473 mg/L in 55 minutes, and the production is detected as FeCr204 by XRD with XPS. When the pH is 2, the initial concentration of 300 mg/L Cr （VI） can be reduced to below 0.5 mg/L in 6 minutes. Therefore, the industrial wastewater containing Cr （VI） can be efficiently disposed by microwave assisted ball milling equipment.