Response surface modeling of lead (׀׀) removal by graphene oxide-Fe3O4 nanocomposite using central composite design

Journal of Environmental Health Science & Engineering
Mohammad KhazaeiElham Gholibegloo

Abstract

Magnetic graphene oxide (Fe3O4@SiO2-GO) nanocomposite was fabricated through a facile process and its application as an excellent adsorbent for lead (II) removal was also demonstrated by applying response surface methodology (RSM). Fe3O4@SiO2-GO nanocomposite was synthesized and characterized properly. The effects of four independent variables, initial pH of solution (3.5-8.5), nanocomposite dosage (1-60 mg L(-1)), contact time (2-30 min), and initial lead (II) ion concentration (0.5-5 mg L(-1)) on the lead (II) removal efficiency were investigated and the process was optimized using RSM. Using central composite design (CCD), 44 experiments were carried out and the process response was modeled using a quadratic equation as function of the variables. The optimum values of the variables were found to be 6.9, 30.5 mg L(-1), 16 min, and 2.49 mg L(-1) for pH, adsorbent dosage, contact time, and lead (II) initial concentration, respectively. The amount of adsorbed lead (II) after 16 min was recorded as high as 505.81 mg g(-1) for 90 mg L(-1) initial lead (II) ion concentration. The Sips isotherm was found to provide a good fit with the adsorption data (KS = 256 L mg(-1), nS = 0.57, qm = 598.4 mg g(-1), and R(2) = 0.984). The mean fre...Continue Reading

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Citations

May 27, 2016·Journal of Environmental Health Science & Engineering·L D NaiduPieter Stroeve
May 5, 2018·Environmental Science and Pollution Research International·Adeyinka S YusuffJima F Ngochindo
Dec 15, 2020·Journal of Environmental Health Science & Engineering·Khadije LotfiBahram Gharabaghi
Dec 15, 2020·Journal of Environmental Health Science & Engineering·Allahbakhsh JavidSeid Kamal Ghadiri
Aug 18, 2020··Nugrahani Primary PutriMoch. Saifur Rijal

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