Preparation of a quinoa straw-derived porous carbon material and a Fe3O4-contained composite material for removal of rhodamine B from water
Open Access
- 1 December 2020
- journal article
- research article
- Published by IOP Publishing in Materials Research Express
- Vol. 7 (12), 125603
- https://doi.org/10.1088/2053-1591/abd0a5
Abstract
In this work, quinoa straw (QS) is considered as a sustainable biomass resource to produce adsorbent materials for wastewater treatment. Two materials, a porous carbon material derived from QS (PCQS) and a Fe3O4-containing composite material based on the PCPS (Fe3O4@PCQS), were prepared. PCQS was prepared via carbonization and subsequent chemical activation of the QS using NaOH. Thereafter, PCQS was characterized by SEM, TEM, XRD, IR, XPS, and N2 adsorption-desorption analysis. As a carbon material with heterogeneous pores, PCQS has a BET specific surface area of 3435.21 m2 g-1, which is about 175 times higher than that of the precursor QS (19.60 m2 g-1). The PCQS had an adsorption capacity of 1778.1 mg g-1 toward rhodamine B (RhB), and the adsorption followed pseudo-second-order kinetics and the Freundlich isotherm model. The PCQS was further modified by synthesizing Fe3O4 magnetic nanoparticles on the surface of PCQS to give Fe3O4@PCQS. The adsorption capacity of Fe3O4@PCQS toward RhB reached 1156.2 mg g-1, and it could be rapidly separated from water by applying an external magnetic field. The PCQS and Fe3O4@PCQS exhibited acceptable reusability which was evaluated through ten successive adsorption/desorption cycles. In summary, the adsorption capacities of PCQS and Fe3O4@PCQS toward RhB are comparable with most current adsorbents, including the graphene-based materials, which shows that QS is a promising biomass feedstock to prepare carbon-based materials and composites.Keywords
Funding Information
- the Science and Technology Project from Education Department of Jilin Province (JJKH20190906KJ)
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