University of Oulu

Harshita Gogoi, Tiina Leiviskä, Jaakko Rämö, Juha Tanskanen, Production of aminated peat from branched polyethylenimine and glycidyltrimethylammonium chloride for sulphate removal from mining water, Environmental Research, Volume 175, 2019, Pages 323-334, ISSN 0013-9351,

Production of aminated peat from branched polyethylenimine and glycidyltrimethylammonium chloride for sulphate removal from mining water

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Author: Gogoi, Harshita1; Leiviskä, Tiina1; Rämö, Jaakko1;
Organizations: 1Chemical Process Engineering, P.O. Box 4300, FIN-90014, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2019-10-01


A novel bio-based anion exchanger was developed to remove sulphate from synthetic solutions and mine water. Different modification parameters such as chemical dosage and reaction time were tested when using a unique combination of branched polyethylenimine (PEI) and glycidyltrimethylammonium chloride (GTMAC) to produce an aminated biosorbent (termed PG-Peat). The novel and environment-friendly modification method was shown by FTIR and XPS analyses to be able to introduce quaternary ammonium and N-H groups into PG-Peat. The optimal modification conditions (PEI: 0.26 mmol/g, GTMAC: 0.0447 mol/g, reaction time: 18 h) resulted in the maximum sulphate uptake capacity (189.5 ± 2.7 mg/g) with a partition coefficient value of 0.02 mg/g/μM under acidic conditions. At low pH, amine groups on the peat surface became cationized, thereby resulting in a higher sulphate removal capacity. Batch sorption tests using PG-Peat exhibited rapid sulphate sorption after only five minutes of contact. The sulphate uptake by PG-Peat was unaffected by the presence of varying chloride concentrations, while slightly lower uptake capacity was observed when different concentrations of nitrate were present. The biosorbent showed high recyclability, which was revealed in regeneration studies. Tests were performed involving real mine water, where PG-Peat showed its potential to be a highly efficient biosorbent for sulphate removal at low pH values, indicating its suitability for treating acidic mine waters.

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Series: Environmental research
ISSN: 0013-9351
ISSN-E: 1096-0953
ISSN-L: 0013-9351
Volume: 175
Pages: 323 - 334
DOI: 10.1016/J.ENVRES.2019.05.022
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: The study was conducted as part of the Comprehensive Sulphate Management in Cold Mining Waters (COSUMA) research project (grant number 295050), funded by the Academy of Finland.
Academy of Finland Grant Number: 295050
Detailed Information: 295050 (Academy of Finland Funding decision)
Copyright information: © 2019 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (