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Title: Biochars for the removal of naphthenic acids from water: A prospective approach towards remediation of petroleum refinery wastewater
Authors: Singh R.
Naik D.V.
Dutta, Raj Kumar
Kanaujia P.K.
Published in: Journal of Cleaner Production
Abstract: We report methodology for developing three different surface modified biochars produced from rice straw, bagasse, and eucalyptus wood for the adsorptive removal of benzoic acid as a model pollutant for remediation of naphthenic acid-rich petroleum refinery wastewater. Solid-phase extraction or miniaturized column format packed with (a) untreated biochars; (b) acid-treated (HCl and HNO ) biochars; and (c) non-covalent PDDA (cationic polyelectrolyte) wrapped biochars were employed for the adsorption studies. The benzoic acid loading capacities were in the range of 0.46 and 7.97 mg g , with an order of loading as: HCl-treated > HNO -treated > PDDA-treated > untreated biochar. The acid-treated biochars revealed an increase in the oxygen content (wt %) owing to –COOH groups, corroborated by FTIR studies and point of zero charges (pH ) = 2.40. The best loading result, attributed to dipole-based or π-π stacking, was obtained for HCl-treated rice straw biochars. Its BET surface area increased from 18.45 m g (untreated) to 49.01 m g HCl-treated, with pore volume (0.067 cm g ) and pore diameter (55.27 Å), corroborated by observation of pores of different sizes and patterns by scanning electron microscopy. The optimum pH for maximum adsorption of benzoic acid was 2, and 3 mL methanol was used to regenerate the biochar column with up to 90% removal of the adsorbate. Validation of experimental parameters was performed through naphthenic acid spiked water, and the results were also compared with adsorption over activated carbon. Our results are optimistic towards developing biochars as a low-cost and eco-friendly option to manage agricultural waste for removing pollutants from water.
Citation: Journal of Cleaner Production(2020), 266
Issue Date: 2020
Publisher: Elsevier Ltd
Keywords: Benzoic acid
Naphthenic acids
Rice straw
Solid-phase extraction
Activated carbon
Agricultural robots
Agricultural wastes
Benzoic acid
Chlorine compounds
Nitric acid
Phase separation
Scanning electron microscopy
Water pollution
Adsorption studies
ISSN: 9596526
Author Scopus IDs: 56711455800
Author Affiliations: Singh, R., Analytical Sciences Division, Indian Institute of Petroleum, Council of Scientific and Industrial Research, Haridwar Road, Dehradun, Uttarakhand 248005, India, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakha
Funding Details: Bangladesh Council of Scientific and Industrial Research, BCSIR: OLP- 522019.The authors are thankful to Dr. Anjan Ray, Director, CSIR-IIP for his valuable guidance. We greatly appreciate the financial support provided by the Council of Scientific and Industrial Research (CSIR) , New Delhi, India under the project OLP- 522019 . Mr
Corresponding Author: Kanaujia, P.K.; Analytical Sciences Division, Haridwar Road, India; email:
Appears in Collections:Journal Publications [CY]

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