| Citation: | PENG Y,FENG Y P,LAN W W,et al.Passivation effect of Fe0 in the removal of Cr (Ⅵ) from groundwater and the optimization of electrochemical depassivation parameters[J].Journal of Environmental Engineering Technology，2023，13（4）：1595-1603 doi: 10.12153/j.issn.1674-991X.20221003
|
Zero-valent iron (Fe0) is widely used in the remediation of groundwater polluted by Cr(Ⅵ). However, there is a problem that passivation reduces the remediation efficiency. First of all, Fe0 was used to remove Cr (Ⅵ) in groundwater, and passivated iron filings with different passivation degrees were prepared. Subsequently, the electrochemical method was used to deactivate the passivated iron filings, and the effects of electrode setting, electrolysis voltage, electrolysis time and electrode distance on the depassivation effect were studied by single factor test and orthogonal test. Meanwhile, the depassivation solution and the iron filings before and after depassivation as well as the precipitate produced during the depassivation process were analyzed. The results showed that the depassivation effect was the best when passivated iron filings were used as anode. The depassivation effect first increased and then decreased with the increase of electrolysis voltage, decreased with the increase of electrode distance, and increased with the increase of electrolysis time. The influence of three factors on the depassivation effect from high to low was as follows: electrolysis time > electrolysis voltage > electrode distance. The results of the X-ray diffractometer, scanning electron microscope and energy dispersive spectroscopy analysis showed that the activity of passivated iron filings could be recovered effectively due to surface precipitation shedding under electrochemical action. The optimum conditions for depassivation of passivated iron filings were as follows: passivated iron filings for anode, electrolysis voltage = 10 V, electrolysis time = 60 min, electrode distance = 2 cm. Under these conditions, the removal rate of Cr (Ⅵ) by iron filings after depassivation could be restored to more than 90% of the original; Cr (Ⅲ) precipitate could not be dissolved, but the concentration of Fe in the solution could be increased during depassivation process. These research results could provide a useful reference for improving the remediation effect and material utilization rate of Cr (Ⅵ) polluted groundwater by Fe0.
| [1] |
FU F L, MA J, XIE L P, et al. Chromium removal using resin supported nanoscale zero-valent iron[J]. Journal of Environmental Management,2013,128:822-827. doi: 10.1016/j.jenvman.2013.06.044
|
| [2] |
徐腾, 南丰, 蒋晓锋, 等.制革场地土壤和地下水中铬污染来源及污染特征研究进展[J]. 土壤学报,2020,57(6):1341-1352.
XU T, NAN F, JIANG X F, et al. Progresses in research on sources and characteristics of chromium pollution in soils and groundwater of tannery sites[J]. Acta Pedologica Sinica,2020,57(6):1341-1352.
|
| [3] |
潘虹, 王兴润, 王雷, 等.生物炭负载硫化改性纳米零价铁去除水中的Cr(Ⅵ)[J]. 环境工程技术学报,2023,13(2):663-668.
PAN H, WANG X R, WANG L, et al. Experimental study on the removal of Cr(Ⅵ) from water by biochar-based sulfide modification loaded with nano-zero valent iron[J]. Journal of Environmental Engineering Technology,2023,13(2):663-668.
|
| [4] |
GAO Y, XIA J. Chromium contamination accident in China: viewing environment policy of China[J]. Environmental Science & Technology,2011,45(20):8605-8606.
|
| [5] |
张雨婷. 生物质炭对电镀废水中六价铬的去除及机理研究[D]. 长春: 吉林大学, 2020.
|
| [6] |
陈明, 孙宗健, 王金生.加强环境监管 确保环境安全: 多起异地非法倾倒危险废物事件的启示[J]. 环境保护,2011,39(21):52-54.
|
| [7] |
2018中国生态环境状况公报[R]. 北京:生态环境部, 2018.
|
| [8] |
党伟, 王莉莉, 张婷婷.氨化酒糟吸附剂去除电镀废水中六价铬研究[J]. 环境工程技术学报,2020,10(1):79-84. doi: 10.12153/j.issn.1674-991X.20190083
DANG W, WANG L L, ZHANG T T. Removal of hexavalent chromium from electroplating wastewater by ammoniated distilled grain-based adsorbent[J]. Journal of Environmental Engineering Technology,2020,10(1):79-84. doi: 10.12153/j.issn.1674-991X.20190083
|
| [9] |
孙艳涛, 刘适博, 李婷婷, 等.水中铬处理方法的研究进展[J]. 当代化工,2015,44(6):1368-1370.
SUN Y T, LIU S B, LI T T, et al. Research progress in treating chromium in water[J]. Contemporary Chemical Industry,2015,44(6):1368-1370.
|
| [10] |
卜芳, 郭建维, 王琴, 等.电沉积零价铁中性条件下还原去除Cr(Ⅵ)[J]. 化工进展,2011,30(增刊 1):870-873.
BU F, GUO J W, WANG Q, et al. Reduction and removal of Cr(Ⅵ) by electrodeposition of zero-valent iron under neutral conditions[J]. Chemical Industry and Engineering Progress,2011,30(Suppl 1):870-873.
|
| [11] |
刘翔, 唐翠梅, 陆兆华, 等.零价铁PRB技术在地下水原位修复中的研究进展[J]. 环境科学研究,2013,26(12):1309-1315.
LIU X, TANG C M, LU Z H, et al. Progress of Fe0-PRB in remediation of contaminated groundwater[J]. Research of Environmental Sciences,2013,26(12):1309-1315.
|
| [12] |
万龙, 孟凡生, 杨琦, 等.微电流对零价铁还原Cr(Ⅵ)过程中去钝化作用研究[J]. 环境工程技术学报,2018,8(4):429-434.
WAN L, MENG F S, YANG Q, et al. Depassivation of micro current in hexavalent chromium reduction by zero valent iron[J]. Journal of Environmental Engineering Technology,2018,8(4):429-434.
|
| [13] |
HAN W J, FU F L, CHENG Z H, et al. Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater[J]. Journal of Hazardous Materials,2016,302:437-446. doi: 10.1016/j.jhazmat.2015.09.041
|
| [14] |
CHEN L, CHEN Z H, CHEN D, et al. Removal of hexavalent chromium from contaminated waters by ultrasound-assisted aqueous solution ball milling[J]. Journal of Environmental Sciences,2017,52:276-283. doi: 10.1016/j.jes.2016.04.006
|
| [15] |
LEONEL A G, MANSUR A A P, MANSUR H S. Advanced functional nanostructures based on magnetic iron oxide nanomaterials for water remediation: a review[J]. Water Research,2021,190:116693. doi: 10.1016/j.watres.2020.116693
|
| [16] |
ELJAMAL O, THOMPSON I P, MAAMOUN I, et al. Investigating the design parameters for a permeable reactive barrier consisting of nanoscale zero-valent iron and bimetallic iron/copper for phosphate removal[J]. Journal of Molecular Liquids,2019,299(C):112144.
|
| [17] |
张道萍, 孟凡生, 王业耀, 等.双金属和多金属系统对零价铁利用效率的改进[J]. 环境科学研究,2016,29(9):1362-1369.
ZHANG D P, MENG F S, WANG Y Y, et al. Improvement of zero valent iron efficiency by bimetallic system and multi-metallic system[J]. Research of Environmental Sciences,2016,29(9):1362-1369.
|
| [18] |
卢欣. 渗透式反应墙对地下水Cr(Ⅵ)去除及电化学解钝化研究[D]. 北京: 清华大学, 2014.
|
| [19] |
CHEN L, JIN S, FALLGREN P H, et al. Electrochemical depassivation of zero-valent iron for trichloroethene reduction[J]. Journal of Hazardous Materials,2012,239/240:265-269. doi: 10.1016/j.jhazmat.2012.08.074
|
| [20] |
张金梦. 零价铁电化学法还原地下水中的铬[D]. 沈阳: 沈阳大学, 2017.
|
| [21] |
WANNER C, ZINK S, EGGENBERGER U, et al. Assessing the Cr(Ⅵ) reduction efficiency of a permeable reactive barrier using Cr isotope measurements and 2D reactive transport modeling[J]. Journal of Contaminant Hydrology,2012,131(1/2/3/4):54-63.
|
| [22] |
WANNER C, EGGENBERGER U, MÄDER U. Reactive transport modelling of Cr(Ⅵ) treatment by cast iron under fast flow conditions[J]. Applied Geochemistry,2011,26(8):1513-1523. doi: 10.1016/j.apgeochem.2011.06.015
|
| [23] |
MELITAS N, CHUFFE-MOSCOSO O, FARRELL J. Kinetics of soluble chromium removal from contaminated water by zerovalent iron media: corrosion inhibition and passive oxide effects[J]. Environmental Science & Technology,2001,35(19):3948-3953.
|
| [24] |
廉冰娴, 许兵.阳极氧化制备氧化钛薄膜原理剖析[J]. 表面技术,2010,39(4):45-46. doi: 10.3969/j.issn.1001-3660.2010.04.014
LIAN B X, XU B. Principle analyses of preparation oxide titanium film using anode oxidation[J]. Surface Technology,2010,39(4):45-46. doi: 10.3969/j.issn.1001-3660.2010.04.014
|
| [25] |
陈亮. 零价铁渗透反应格栅中铁的微生物钝化效应及电活化技术[D]. 北京: 中国地质大学(北京), 2012.
|
Figures(10) / Tables(4)
Copyright © Editorial Department of Journal of Environmental Engineering Technology
Supported by: Beijing Renhe Information Technology Co., Ltd.
DownLoad:
