Enhanced reduction of nitrate by zero-valent iron at elevated temperatures

Journal of Hazardous Materials
Se Chang AhnDaniel K Cha

Abstract

Kinetics of nitrate reduction by zero-valent iron at elevated temperatures was studied through batch and column experiments. It was hypothesized that under increased solution temperatures, the zero-valent iron may accelerate the reduction of nitrate by overcoming the activation energy barrier to nitrate reduction. The results of the batch experiment showed the synergistic effects of elevated temperature (75 degrees C) and a buffered condition (pH 7.4 with 0.1 M HEPES) to enhance the rate of nitrate reduction by zero-valent iron from 0.072+/-0.006 h(-1) ((0.35+/-0.03) x 10(-4) L m(-2) h(-1)) at room temperature to 1.39+/-0.23 h(-1) ((1.03+/-0.07) x 10(-3) L m(-2) h(-1)). Complete nitrate removal was obtained in a Fe(0) column after 30 min under both buffered and unbuffered conditions at 75 degrees C. These results indicate that a temperature increase could overcome the energy barrier. We suggest that an iron reduction process at moderately elevated temperature (50-75 degrees C) may be a suitable method for removing nitrate from industrial discharges.

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Citations

Oct 5, 2013·Aquatic Toxicology·Chenghong JiangRavendra Naidu
Jul 26, 2011·Environmental Technology·S B MortazaviG Moussavi
Jan 25, 2014·Journal of Hazardous Materials·Fenglian FuHong Liu
Nov 4, 2009·Journal of Hazardous Materials·Jianfa LiQingling Meng
Sep 5, 2009·Journal of Hazardous Materials·Xue BaiZhong-You Wang
Apr 4, 2009·Journal of Hazardous Materials·Jeong-Hee ChoiJeong-Hyo Bae
Nov 26, 2015·Bioresource Technology·Seok-Young OhDaniel K Cha
Mar 20, 2015·Environmental Science and Pollution Research International·Vaishali Ashok, Subrata Hait
Mar 22, 2014·Environmental Technology·Hongyuan LiuYan Zhang
Mar 12, 2008·Chemosphere·Kyung-Hee Shin, Daniel K Cha
Sep 19, 2016·Journal of Hazardous Materials·Brian A Lenell, Yuji Arai
Oct 5, 2016·Chemosphere·Jie XuAdrian Fisher
Nov 4, 2016·Bioresource Technology·Yongsheng LuGuangren Qian
May 28, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yupan YunLei Zheng
Jan 30, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yongye LiZecong Ding
Jan 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Tihitinna Asmellash BelayJ C Liu
Feb 22, 2012·Journal of Environmental Monitoring : JEM·Min-Kyu JiByong-Hun Jeon
Dec 27, 2017·Engineering in Life Sciences·Mahdieh Rajab BeigyMarzieh Shekarriz
Dec 6, 2018·Environmental Science and Pollution Research International·Lianpei ZouZhi Ping Xu
Dec 2, 2020·The Science of the Total Environment·Inyoung Kim, Daniel K Cha
Mar 18, 2021·Environmental Science and Pollution Research International·George Kwame Amoako-NimakoFangmin Chen
May 18, 2010·The Science of the Total Environment·Seok-Young OhPei C Chiu

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