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Removal of humic acid from water using adsorption coupled with electrochemical regeneration
Hafiz Muhammad Anwaar Asghar,Syed Nadir Hussain,Edward Pelham Lindfield Roberts,Nigel Willis Brown 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.7
A novel and economic waste water treatment technology comprised of adsorption coupled with electrochemical regeneration was introduced at the University of Manchester in 2006. An electrically conducting adsorbent material called NyexTM 1000 (Graphite intercalation based material) was developed for the said purpose. This adsorbent material delivered significantly lower adsorption capacity for the removal of a number of organic pollutants. With the aim to expand the scope of newly developed adsorbent material called NyexTM 2000, we studied the adsorption of humic acid followed by electrochemical regeneration. NyexTM 2000 is a highly electrically conducting material with an adsorption capacity almost twice that of NyexTM 1000 (intercalation based graphite compound) for humic acid. The adsorption of humic acid onto both NyexTM adsorbents was found to be fast enough keeping almost the same kinetics with approximately 50% of the adsorption capacity being achieved within the first twenty minutes. The parameters affecting the regeneration efficiency, including the treatment time, charge passed and current density, were investigated. The regeneration efficiency at around 100% for NyexTM 1000 & 2000 adsorbents saturated with humic acid was obtained using the charge passed of 8 and 22 Cg−1 at a current density of 7mA cm−2 during a treatment time of 30minutes,respectively.
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Improved phenol adsorption from aqueous solution using electrically conducting adsorbents
Hafiz Muhammad Anwaar Asghar,Syed Nadir Hussain,Hamed Sattar,Edward Pelham Lindfield Roberts,Nigel Willis Brown 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
The electrically conducting and partially porous graphite based adsorbent (called NyexTM 2000) was testedfor its adsorption capacity and electrochemical regeneration ability for the removal of phenol from aqueous solution. NyexTM 2000 was tested in comparison with NyexTM 1000, which is currently being used for a number of industrialwaste water treatment applications. NyexTM 1000 exhibited small adsorption capacity of 0.1 mg g−1 for phenol becauseof having small specific surface area of 1 m2 g−1. In contrast, NyexTM 2000 with specific surface area of 17 m2 g−1 deliveredan adsorption capacity of 0.8 mg g−1, which was eight-fold higher than that of NyexTM 1000. NyexTM 2000 wassuccessfully electrochemically regenerated by passing a current of 0.5 A, charge passed of 31 C g−1 for a treatmenttime of 45 minutes. These electrochemical parameters were comparable to NyexTM 1000 for which a current of 0.5 A,charge passed of 5 C g−1 for a treatment time of 20 minutes were applied for complete oxidation of adsorbed phenol. The comparatively high charge density was found to be required for NyexTM 2000, which is justified with its higheradsorption capacity. The FTIR results validated the mineralization of adsorbed phenol into CO2 and H2O except theformation of few by-products, which were in traces when compared with the concentration of phenol removed fromaqueous solution. The electrical energy as required for electrochemical oxidation of phenol adsorbed onto NyexTM 1000& 2000 was found to be 214 and 196 J mg−1, respectively. The comparatively low energy requirement for electrochemicaloxidation using NyexTM 2000 is consistent with its higher bed electrical conductivity, which is twice that of NyexTM1000.
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