Imperial College London
Portrait Picture

Emeritus ProfessorNigelGraham

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Investigator
 
 
 
//

Contact

 

n.graham Website

 
 
//

Assistant

 

Miss Judith Barritt +44 (0)20 7594 5967

 
//

Location

 

406Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{McBeath:2020:10.1039/d0ew00261e,
author = {McBeath, ST and Wilkinson, DP and Graham, NJD},
doi = {10.1039/d0ew00261e},
journal = {Environmental Science: Water Research & Technology},
pages = {2405--2415},
title = {Advanced electrochemical oxidation for the simultaneous removal of manganese and generation of permanganate oxidant},
url = {http://dx.doi.org/10.1039/d0ew00261e},
volume = {6},
year = {2020}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Emerging electrochemical systems, such as advanced electro-oxidation, provide a potentially powerful alternative to conventional oxidation processes which can often be unsuitable for small, remote and decentralised system applications. The one electro-oxidation process, which may be well suited for these applications, is the use of high oxygen overpotential boron-doped diamond (BDD) electrodes, as a pre-oxidation step for the removal of various raw water contaminants. While BDD electro-oxidation has been studied extensively for the abatement of organic micropollutants, its application as a pre-oxidation technology for the removal of soluble manganese (Mn2+) in source waters for drinking water supply, has not been reported to-date. In this study, we summarise the results of tests using a bench-scale electro-oxidation system and synthetic Mn2+ solutions in order to consider the simultaneous removal of manganese and the generation of permanganate. The results showed that total manganese was reduced by 9.1, 38.7 and 57.4% at current densities of 10, 40 and 80 mA cm−2, respectively, with an initial Mn2+ concentration of 39 μM. Increased Mn removal at higher current density was attributed to increased generation of, and reaction with, hydroxyl radicals, indicated by a direct proportional relationship between pseudo-first order reaction rate constants for methanol (OH radical scavenger) and current density. A mathematical model was developed to describe Mn removal under mass transport limitations, and was found to correlate well with experimental data. Finally, a completely novel synthesis pathway for the generation of permanganate species (Mn7+) is presented, whereby concentrations up to 0.9 μM were synthesised from Mn2+ in circumneutral conditions.
AU  - McBeath,ST
AU  - Wilkinson,DP
AU  - Graham,NJD
DO  - 10.1039/d0ew00261e
EP  - 2415
PY  - 2020///
SN  - 2053-1400
SP  - 2405
TI  - Advanced electrochemical oxidation for the simultaneous removal of manganese and generation of permanganate oxidant
T2  - Environmental Science: Water Research & Technology
UR  - http://dx.doi.org/10.1039/d0ew00261e
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000562926300011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.rsc.org/en/content/articlelanding/2020/EW/D0EW00261E#!divAbstract
UR  - http://hdl.handle.net/10044/1/82898
VL  - 6
ER  -
Download