화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.31, No.5, 834-840, May, 2014
DOI10.1007/s11814-013-0291-5  Export Citation
Improved phenol adsorption from aqueous solution using electrically conducting adsorbents
Hafiz Muhammad Anwaar Asghar†, Syed Nadir Hussain, Hamed Sattar1, Edward Pelham Lindfield Roberts2, and Nigel Willis Brown3
  • School of Chemical Engineering and Analytical Science, The University of Manchester, M60 1QD, UK
  • 1School of Process, Environmental & Materials Engineering, University of Leeds, Leeds LS2 9JT, UK
  • 2Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
  • 3Arvia Technology Limited, Daresbury Innovation Centre, Keckwick Lane, Daresbury, Cheshire WA4 4FS, UK
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The electrically conducting and partially porous graphite based adsorbent (called NyexTM 2000) was tested for 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 industrial waste water treatment applications. NyexTM 1000 exhibited small adsorption capacity of 0.1 mg g^(-1) for phenol because of having small specific surface area of 1 m2 g^(-1). In contrast, NyexTM 2000 with specific surface area of 17 m2 g^(-1) delivered an adsorption capacity of 0.8mg g^(-1), which was eight-fold higher than that of NyexTM 1000. NyexTM 2000 was successfully electrochemically regenerated by passing a current of 0.5 A, charge passed of 31 C g^(-1) for a treatment time 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 higher adsorption capacity. The FTIR results validated the mineralization of adsorbed phenol into CO2 and H2O except the formation of few by-products, which were in traces when compared with the concentration of phenol removed from aqueous 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 electrochemical oxidation using NyexTM 2000 is consistent with its higher bed electrical conductivity, which is twice that of NyexTM 1000.
Keywords:Phenol;Improved Adsorption;Bed Electrical Conductivity;Reduced Electrical Cost
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