| Sono-synthesized Fe3O4–GO–NH2 nanocomposite for highly efficient ultrasound-assisted magnetic dispersive solid-phase microextraction of hazardous dye Congo red from water samples |
| Phitchan Sricharoen1,2, Saksit Chanthai1, Natthida Lamaiphan1, Chinawooth Sakaew1, Nunticha Limchoowong3, Prawit Nuengmatcha4, Won-Chun Oh5 |
1Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science Materials Chemistry Research Center, Khon Kaen University, Khon Kaen 40002, Thailand
2Nuclear Research and Development Division , Thailand Institute of Nuclear Technology (Public Organization), 9/9 Moo 7, Tambon Saimoon, Ongkharak, Nakhon Nayok 26120, Thailand
3Department of Chemistry, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand
4Nanomaterials Chemistry Research Unit, Department of Chemistry, Faculty of Science and Technology, Nakhon Si Thammarat Rajabhat University , Nakhon Si Thammarat 80280, Thailand
5Department of Advanced Materials Science and Engineering, Hanseo University, Seosan-si , Chungcheongnam-do 31962, South Korea |
|
|
|
Received: August 16, 2020; Revised: October 2, 2020 Accepted: October 7, 2020. Published online: March 31, 2021. |
|
|
|
| ABSTRACT |
|
This research focuses on the preparation of amino-functionalized magnetic graphene oxide nanocomposite (Fe3O4–GO–NH2), which increases the pre-concentration efficiency of Congo red residue in water samples. Their characterizations by FT-IR, SEM, EDX, and VSM were carried out in line with the magnetic property. The magnetic adsorbent was mainly used for the pre-concentration of anionic dye under optimized conditions of ultrasound-assisted magnetic dispersive solid-phase microextraction (UA-MDSPME). Typically, pre-concentration optimization conditions such as the pH of the solution, sorbent amount, power and sonication time, type of eluting solvent and its concentration were precisely investigated before the determination by UV–visible spectrophotometry. The analytical performance of the UA-MDSPE method was validated and found to have a linear range of 1.0–25.0 mg L−1 with R2 > 0.999. The limits of detection and quantification were 4.3 μg L−1 and 14.4 μg L−1, respectively. The precision of the method calculated from the slope of the calibration curve (%RSD, n = 3 × 3) for intra-day and inter-day analyses was 3.23 and 4.74, respectively. The extraction of Congo red dye from real water samples (drinking water, swamp water, and tap water) ranged from 90.65 to 105.8%. The enrichment factor of the developed procedure was averaged to 32.4 folds, ensuring the determination of trace amounts of residual dye in the water samples. It is, therefore, concluded that the magnetic adsorbent is an efficient method for the pre-concentration of hazardous dye from aqueous solution. |
| Key words:
Fe3O4 · Graphene oxide · Amino · Nanocomposite · Magnetic dispersive solid-phase microextraction · Congo red |
|
|
|
PDF Links 
Full text via DOI
Download Citation 
