Removal of Methyl Red from Aqueous Solution Using Polyethyleneimine Crosslinked Alginate Beads with Waste Foundry Dust as a Magnetic Material

Hyunsoo Kim, Oyunbileg Purev, Eunji Myung, Nagchoul Choi and Kanghee Cho
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Hyunsoo Kim: Department of Energy and Resource Engineering, Chosun University, Gwangju 61452, Korea
Oyunbileg Purev: Department of Energy and Resource Engineering, Chosun University, Gwangju 61452, Korea
Eunji Myung: Green-Bio Research Facility Center, Seoul National University, Pyeongchang-gun 25354, Korea
Nagchoul Choi: Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
Kanghee Cho: Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea

IJERPH, 2022, vol. 19, issue 15, 1-19

Abstract: In this study, a cost-effective adsorbent based on sodium alginate (SA) with waste foundry dust (WFD) was fabricated for the removal of methyl red (MR) from aqueous media. However, the utilization of WFD/SA beads to remove anionic dyes (such as MR) from effluents has limitations associated with their functional groups. To improve the adsorption performance, WFD/SA-polyethyleneimine (PEI) beads were formed via PEI crosslinking onto WFD/SA beads, which could be attributed to the formation of amide bonds from the carboxyl and amino groups due to the change of N-H bonds in the reaction. The Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results indicated that PEI was crosslinked on the WFD/SA via a chemical reaction. In the FTIR spectra of WFD/SA-PEI, peaks of the –COO (asymmetric) stretching vibration shifted to 1598 and 1395 cm −1 , which could be attributed to the hydrogen-bonding effect of the N–H groups in PEI. In the N1s spectrum, three deconvoluted peaks were assigned to N in –N= (398.2 eV), –NH/–NH 2 (399.6 eV), and NO 2 (405.2 eV). WFD/SA-PEI beads were assessed and optimized for aqueous MR adsorption. The WFD/SA-PEI beads showed a high removal efficiency for MR (89.1%) at an initial concentration of 1000 mg/L, and presented a maximum MR adsorption capacity of 672.7 mg/g MR. The adsorption process showed a good fit with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. The amino and hydroxyl groups in the WFD/SA-PEI beads facilitate strong hydrogen bonding and electrostatic interactions. Moreover, these WFD/SA-PEI beads were easily recovered after the adsorption process.

Keywords: waste foundry dust; sodium alginate; polyethylenimine; methyl red removal; adsorption (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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