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Visible light photocatalytic degradation of HPAM polymer in oil produced water using supported zinc oxide nanorods
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2018 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 351, p. 56-64Article in journal (Refereed) Published
Abstract [en]

Polymer flooding displacement ability during petroleum extraction from the earth's crust plays an important role in enhanced oil recovery processes. Produced water, as a byproduct, still contain high concentrations of petroleum hydrocarbons and partially hydrolyzed polyacrylamide (HPAM) which is a serious environmental concern. Remediating produced water economically is a big challenge for meeting the permissible discharge limits leading to failure in the effectiveness of the conventional water treatment technologies. Advanced oxidation processes (AOPs) are playing increasing role in the treatment of polluted water and is receiving much attention in recent times as a green and safer water treatment technology. Here we report a new approach to use vertically aligned zinc oxide nanorods (ZnO NRs) supported on substrates engineered for improving their visible light harvesting capacity for effective solar photocatalytic degradation of HPAM. The viscosity of collected oilfield produced water containing HPAM were found to be reduced dramatically when the samples are photocatalytically degraded using ZnO nanorod catalysts irradiated with simulated solar light showing a reduction of 51% within 6 h. With high pressure liquid chromatography 68, 62, 56 and 45% removal of 25, 50, 100 and 150 ppm HPAM, respectively, was demonstrated. The pH of the solution was observed to move to acidic region due to acetamide, nitrate, propionamide and acetic acid which are the intermediate byproducts formed during degradation as determined by mass spectrometry. Zinc oxide nanorod coatings showed about 74% removal efficiency over 5 cycles with less than 1.2% removal of zinc ions after 6 h of light irradiation.

Place, publisher, year, edition, pages
Elsevier B.V. , 2018. Vol. 351, p. 56-64
Keywords [en]
Enhanced oil recovery, HPAM, Produced water, Solar photocatalysis, Zinc oxide nanorods, Byproducts, Enhanced recovery, High pressure liquid chromatography, II-VI semiconductors, Light, Mass spectrometry, Nanocatalysts, Nanorods, Oil well flooding, Petroleum chemistry, Stripping (removal), Structural geology, Water pollution, Well flooding, Zinc coatings, Zinc oxide, Conventional water treatment, Partially hydrolyzed polyacrylamide, Solar photocatalytic degradation, Water treatment technologies, Water treatment
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236602DOI: 10.1016/j.cej.2018.06.071ISI: 000444000000007Scopus ID: 2-s2.0-85048727613OAI: oai:DiVA.org:kth-236602DiVA, id: diva2:1265734
Note

Export Date: 22 October 2018; Article; CODEN: CMEJA; Correspondence Address: Al-Abri, M.; Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, PO Box 33, PC 123, Oman; email: alabri@squ.edu.om; Funding details: TRC, The Research Council; Funding details: SQU, Sultan Qaboos University; Funding text: Authors would like to thank The Research Council , Oman, for its financial support. We would like to acknowledge College of Science (Department of Chemistry) and College of Engineering (Department of Petroleum and Chemical Engineering), Sultan Qaboos University , Oman for technical support. Furthermore, special thanks to Mr. Kristian Pastor from the University of Novi Sad, Serbia and Mr. Azzan Al-Khadori from Sultan Qaboos University, Oman for discussions and assistance during the course of this work. Appendix A. QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-11-26Bibliographically approved

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