稳定化纳米零价铁活化过硫酸盐降解罗丹明B

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第36卷期数: 2020年第11期页码: 57-62 栏目: 出版日期: 2020-06-05

Title:: Degradation of Rhodamine B by Nano-scale Zero-valent Iron Activated Persulfate

作者:: 傅晓艳¹，赵委托²，杜江坤¹，周雨¹，魏璐芸¹

关键词:: font-size: 10pt; ">纳米零价铁; 柠檬酸根; 过硫酸盐; 罗丹明B

Keywords:: font-size: 10pt; ">nano- font-size: 10pt; ">scale zero-valent iron; sodium citrate; persulfate; rhodamine B

摘要:: 选取柠檬酸根作为纳米零价铁的稳定剂，制备出具有核壳结构的柠檬酸根稳定化纳米零价铁（SC-nZVI），并用TEM和XRD对其形貌和结构进行表征。以罗丹明B(RhB)为目标污染物，研究SC-nZVI活化过硫酸盐降解污染物的性能。结果表明，经过柠檬酸根稳定化的纳米

零价铁抗氧化能力增强，能显著提高零价铁活化过硫酸盐的持久性,在重复利用6次以后，对RhB的降解率仍能达到96%。在室温条件下，当pH值为7.0、罗丹明B初始浓度为50 mg/L、K₂S₂O₈浓度为2 mmol/L、稳定化纳米零价铁投加量为0.5 g/L时，反应30 min后，罗丹明B降解率达到98.0%；罗丹明B降解过程符合准一级反应动力学。水中无机阴离子的存在对罗丹明B降解过程有不同程度的抑制作用，排序为NO₃^-＜H₂PO₄^-＜Cl^-＜HCO₃^-。

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^-.

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更新日期/Last Update: 2020-06-01