Pine bark crosslinked to cyclodextrin for the adsorption of 2-nitrophenol from an aqueous solution
Author:
Pholosi Agnes1, Sanni Saheed O.1, Akpotu Samson O.1, Pakade Vusumzi E.1
Affiliation:
1. Adsorption and Water Remediation Research Laboratory, Department of Biotechnology and Chemistry, Faculty of Applied and Computer Sciences , Vaal University of Technology , P. Bag X021 , Vanderbijlpark , 1900 , South Africa
Abstract
Abstract
Adsorbents that are less expensive and more effective at removing organic micropollutants from wastewater have been developed through several approaches. Pine bark was treated with sodium hydroxide and then cross-linked to cyclodextrin using hexamethylene diisocyanate, in this study as an efficient adsorbent in the removal of 2-nitrophenol. FTIR, TGA and pHpzc analysis were used to characterize the biosorbent. The effects of pH, adsorbent mass, contact time and initial concentration on 2-nitrophenol removal was examined through batch adsorption studies. Pine bark crosslinked to cyclodextrin (PB-CD) surface functionalities was confirmed by FTIR analysis. It was discovered that solution pH, adsorbent mass, concentration and contact time all played a crucial role in the 2-nitrophenol uptake on PB-CD biosorbent and pine bark (PB) treated with sodium hydroxide. 2-Nitrophenol equilibrium was achieved with 0.05 g of adsorbents, with an initial concentration of 100–200 mg/dm3 at pH 5 after 60 min. The pseudo-second-order kinetic model and the Langmuir isotherm model significantly fitted the adsorption process. The Langmuir maximum capacities for PB and PB-CD were 47.36 mg/g and 77.82 mg/g, respectively. Overall, in the removal of 2-nitrophenol from an aqueous solution, PB-CD biosorbent is more cost-effective and efficient, in comparison with previously reported biosorbents in literature.
Funder
National Research Foundation
Publisher
Walter de Gruyter GmbH
Subject
General Physics and Astronomy,General Materials Science,General Chemistry
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