抗坏血酸稳定纳米零价铁的制备及其在含Cd(Ⅱ)废水处理中的应用

doi:10.16085/j.issn.1000-6613.2017-2278

化工进展 ›› 2018, Vol. 37 ›› Issue (08): 3231-3237.DOI: 10.16085/j.issn.1000-6613.2017-2278

抗坏血酸稳定纳米零价铁的制备及其在含Cd(Ⅱ)废水处理中的应用

宋珍霞, 张继梅, 巨梦蝶, 唐海, 徐大勇

安徽工程大学生物与化学工程学院, 安徽芜湖 241000

收稿日期:2017-11-06 修回日期:2018-02-08 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: 宋珍霞(1981-),女,博士,讲师,主要从事工业废水处理方面的研究。
作者简介:宋珍霞(1981-),女,博士,讲师,主要从事工业废水处理方面的研究。E-mail:songzhenxiawh@ahpu.edu.cn。
基金资助:
安徽省高等教育提升计划科学研究一般项目（TSKJ2016B15）、国家自然科学基金（51408001）及安徽省大学生创新创业训练计划项目（AH201410363230，201510363207）。

Preparation of L-ascorbic acid-stabilized nanoscale zerovalent iron and its application in Cd(Ⅱ) wastewater treatment

SONG Zhenxia, ZHANG Jimei, JU Mengdie, TANG Hai, XU Dayong

College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, Anhui, China

Received:2017-11-06 Revised:2018-02-08 Online:2018-08-05 Published:2018-08-05

摘要/Abstract

摘要： 利用液相还原法制备抗坏血酸稳定纳米零价铁（AAS-nZVI）并将其应用于含Cd（Ⅱ）废水的处理。在确定最佳AAS/Fe²⁺（摩尔比）的基础上，研究了AAS-nZVI投加量、反应时间和溶液初始pH对Cd（Ⅱ）处理效果的影响，通过L₉（3⁴）正交试验优化AAS-nZVI处理含Cd（Ⅱ）废水的工艺条件；考察了AAS-nZVI的空气稳定性及其处理含Cd（Ⅱ）废水的动力学特性；通过SEM和XRD对处理Cd（Ⅱ）前后的AAS-nZVI进行形貌观测和表征分析。结果表明，AAS/Fe²⁺（摩尔比）为1∶3时，AAS-nZVI对Cd（Ⅱ）去除的去除效果最佳。AAS-nZVI投加量、反应时间和溶液初始pH对Cd（Ⅱ）去除率的影响均达到显著水平（p < 0.05），其中AAS-nZVI投加量的影响达到极显著水平（p < 0.01）；其显著性大小依次为：AAS-nZVI投加量 > 反应时间 > 溶液初始pH。在AAS-nZVI投加量为2.0g/L、反应40min、溶液初始pH=6的最佳工艺条件下，含Cd（Ⅱ）废水（初始浓度20mg/L，溶液体积100mL）的去除率可达92.62%。AAS-nZVI具有很好的空气稳定性，空气中放置15d的AAS-nZVI对Cd（Ⅱ）的去除率仅下降1.99%。AAS-nZVI对Cd（Ⅱ）的去除较好地符合准一级动力学模型，可用L-H动力学模型描述；AAS-nZVI对Cd（Ⅱ）的去除是吸附和还原共同作用的结果。

关键词: 抗坏血酸, 纳米零价铁, 含Cd (Ⅱ)废水, 动力学

Abstract: In this study, L-ascorbic acid stabilized Nanoscale Zerovalent Iron (AAS-nZVI) was produced by liquid-phase reduction and was used for wastewater treatment containing Cd(Ⅱ). On the basis of the optimum AAS/Fe²⁺(molar ratio), the influence factors of reaction system, such as AAS-nZVI dosage, reaction time and initial pH for the effects of the Cd(Ⅱ) removal efficiency were studied. The influential order of the 3 factors and optimal combination conditions were determined by improving the L₉(3⁴) orthogonal layout. Air stability of AAS-nZVI and its kinetic characteristics in Cd(Ⅱ) wastewater treatment were also investigated. The morphology of AAS-nZVI before and after the reaction was characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The results indicated that AAS-nZVI has the best removal effect on Cd(Ⅱ) removal when the molar ratio of AAS/Fe²⁺ was 1:3. The effect of AAS-nZVI dosage on Cd(Ⅱ) removal rate tended to be very significant(p < 0.01), while the effect of reaction time and initial pH were significant(p < 0.05).The important effects of the 3 factors on Cd(Ⅱ) reduction can be shown in the following descending order:AAS-nZVI dosage > reaction time > initial pH. The numerical optimization revealed that the optimum removal rate 92. 62%(the initial Cd(Ⅱ) concentration and volume was 20mg/L and 100mL, respectively)obtained at AAS-nZVI dosage of 2.0g/L, contact time of 40min and initial pH of 6. AAS-nZVI has good air stability, and the removal rate of Cd(Ⅱ) by AAS-nZVI placed 15d in the air was only 1.99% lower than that of the fresh AAS-nZVI. The removal of Cd(Ⅱ) was in accordance with the pseudo first order reduction kinetics model and could be described by the L-H kinetic model. The removal of Cd(Ⅱ)by AAS-nZVI was the common effect of adsorption and reducing action.

Key words: L-ascorbic acid, nanoscale zerovalent iron, Cd (Ⅱ) containing wastewater, reduction kinetics

中图分类号:

宋珍霞, 张继梅, 巨梦蝶, 唐海, 徐大勇. 抗坏血酸稳定纳米零价铁的制备及其在含Cd(Ⅱ)废水处理中的应用[J]. 化工进展, 2018, 37(08): 3231-3237.

SONG Zhenxia, ZHANG Jimei, JU Mengdie, TANG Hai, XU Dayong. Preparation of L-ascorbic acid-stabilized nanoscale zerovalent iron and its application in Cd(Ⅱ) wastewater treatment[J]. Chemical Industry and Engineering Progress, 2018, 37(08): 3231-3237.

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抗坏血酸稳定纳米零价铁的制备及其在含Cd(Ⅱ)废水处理中的应用

Preparation of L-ascorbic acid-stabilized nanoscale zerovalent iron and its application in Cd(Ⅱ) wastewater treatment

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