Effect of Humic Acid on the Removal of Chromium(VI) and the Production of Solids in Iron Electrocoagulation

Environmental Science & Technology
Chao PanDaniel E Giammar

Abstract

Iron-based electrocoagulation can be highly effective for Cr(VI) removal from water supplies. However, the presence of humic acid (HA) inhibited the rate of Cr(VI) removal in electrocoagulation, with the greatest decreases in Cr(VI) removal rate at higher pH. This inhibition was probably due to the formation of Fe(II) complexes with HA that are more rapidly oxidized than uncomplexed Fe(II) by dissolved oxygen, making less Fe(II) available for reduction of Cr(VI). Close association of Fe(III), Cr(III), and HA in the solid products formed during electrocoagulation influenced the fate of both Cr(III) and HA. At pH 8, the solid products were colloids (1-200 nm) with Cr(III) and HA concentrations in the filtered fraction being quite high, while at pH 6 these concentrations were low due to aggregation of small particles. X-ray diffraction and X-ray absorption fine structure spectroscopy indicated that the iron oxides produced were a mixture of lepidocrocite and ferrihydrite, with the proportion of ferrihydrite increasing in the presence of HA. Cr(VI) was completely reduced to Cr(III) in electrocoagulation, and the coordination environment of the Cr(III) in the solids was similar regardless of the humic acid loading, pH, and dissolved...Continue Reading

References

Feb 1, 1966·Biochemistry·N E GoodR M Singh
May 15, 1980·Analytical Biochemistry·W J FergusonN E Good
Jun 21, 2001·Environmental Science & Technology·C KimH Xu
Aug 22, 2001·Journal of Synchrotron Radiation·M Newville
Mar 2, 2002·Environmental Science & Technology·Andrew L Rose, T David Waite
Nov 19, 2003·Environmental Science & Technology·Andrew L Rose, T David Waite
Jun 22, 2005·Journal of Synchrotron Radiation·B Ravel, M Newville
Sep 6, 2005·Journal of Colloid and Interface Science·E Illés, E Tombácz
Nov 27, 2008·Environmental Science & Technology·Karin EusterhuesUdo Schwertmann
Feb 13, 2009·Journal of Environmental Monitoring : JEM·Alexandrina RodriguesRegina Nogueira
Feb 24, 2009·The Science of the Total Environment·Tongzhou LiuIrene M C Lo
Jan 1, 1994·Environmental Science & Technology·B GuJ F McCarthy
Aug 1, 1988·Environmental Science & Technology·L E Eary, D Rai
Sep 1, 1981·Environmental Science & Technology·C J Miles, P L Brezonik
Mar 9, 2012·Nature·Karine LalondeYves Gélinas
Mar 10, 2012·Frontiers in Microbiology·Martha Gledhill, Kristen N Buck
Oct 6, 2012·Environmental Science & Technology·Jeffrey G CatalanoDaniel E Giammar
Jan 8, 2013·Chemosphere·Kristian L Dubrawski, Madjid Mohseni
Jan 16, 2014·Environmental Science & Technology·Jon Petter GustafssonDan Berggren Kleja
May 2, 2014·Environmental Science & Technology·Zimeng WangDaniel E Giammar
Oct 29, 2014·Environmental Science & Technology·Chunmei ChenDonald L Sparks
May 13, 2015·Environmental Science & Technology·Zimeng WangDaniel E Giammar
Dec 21, 2016·Environmental Science & Technology·Chao PanDaniel E Giammar

❮ Previous
Next ❯

Citations

Aug 28, 2019·Environmental Science and Pollution Research International·Linfeng JinLiyuan Zhang
Mar 8, 2019·Scientific Reports·Han LiuZhiyuan Peng
Apr 25, 2020·Nanomaterials·Fabrício Eduardo Bortot CoelhoGiuliana Magnacca
Dec 5, 2018·Journal of Colloid and Interface Science·Guorui FengShaobin Wang
Mar 15, 2019·Environmental Science & Technology·Leiyu HeChongxuan Liu
May 16, 2020·Environmental Science & Technology·Qiuyue GeHong Chen
Oct 19, 2017·Environmental Science & Technology·Chao PanDaniel E Giammar
Oct 11, 2017·Environmental Science & Technology·Peng LiaoDaniel E Giammar
Jun 20, 2020·Environmental Science & Technology·Dong MaMengqiang Zhu
Feb 19, 2019·Environmental Science & Technology·Jiaxin ShiJianhua Guo
Dec 31, 2020·Environmental Science & Technology·Chen TianLiyuan Chai

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.