Reparation of nano-FeS by ultrasonic precipitation for treatment of acidic chromium-containing wastewater

Static experiment

(1) Temperature effects on the preparation of nano-FeS

Figure 2a and b shows the effect of reaction temperature on the treatment of acidic wastewater containing Cr(VI) with FeSO₄ drop adding flow rate of 0.44 mL/s and Fe/S molar ratio of 3. At the reaction equilibrium, the removal rate and unit removal rate of Cr(VI) were the maximum at 15 °C with 99.9% and 590.86 mg/g, respectively. Temperature has a great influence on the generation and growth of grains, when the amount of solute is certain, the increase in temperature leads to a decrease in the supersaturation of…