Degradation of Rhodamine B by Nano-scale Zero-valent Iron Activated Persulfate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
11
Page:
57-62
Column:
Date of publication:
2020-06-05
- Keywords:
- font-size: 10pt; ">nano- font-size: 10pt; ">scale zero-valent iron; sodium citrate; persulfate; rhodamine B
- Abstract:
-
Nano -scale zero-valent iron (nZVI) with core-shell structure stabilized by sodium citrate was prepared, and the shape and structure of the nZVI were characterized by TEM and XRD. The degradation efficiency of the target pollutant rhodamine (RhB) by nZVI activated persulfate was explored. The antioxidant capacity of nZVI stabilized by sodium citrate was enhanced, and the persistence of nZVI activated persulfate was significantly improved. After 6 times of reuse, the removal efficiency of RhB could still reach 96%. When pH was 7.0, dosage of nZVI was 0.5 g/L, reaction time was 30 min，concentration of RhB and K2S2O8 were 50 mg/L and 2 mmol/L, the removal efficiency of RhB was 98.0% at room temperature. The degradation process of RhB conformed to pseudo-first-order kinetics. The presence of inorganic anions in water inhibited the degradation of RhB to different degrees, and the order from small to large was NO3-＜H2PO4-＜Cl-＜HCO3-.
Last Update:
2020-06-01