کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5745917 | 1618782 | 2017 | 43 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Melamine-based dendrimer amine-modified magnetic nanoparticles as an efficient Pb(II) adsorbent for wastewater treatment: Adsorption optimization by response surface methodology
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Magnetic Fe3O4 nanoparticles with an average diameter of 64 nm was synthesized solvothermically and subsequently modified with melamine-based dendrimer amine (MDA-Fe3O4) via grafting method. The synthesized materials were characterized using DLS, SEM, XRD, FTIR, VSM, TGA and elemental analysis techniques. The MDA-Fe3O4 was employed for the efficient removal of Pb(II) ions from an aqueous solution. The adsorption efficiency was investigated in relation to the independent variables of Pb(II) concentration (80-250 mg Lâ1), pH of the solution (3-7), adsorbent dosage (0.1-0.5 g Lâ1) and temperature (10-40 °C) via a central composite design (CCD) using response surface methodology (RSM). The significance of independent variables and their interactions was tested using ANOVA at a 95% confidence limit (α = 0.05). A second-order quadratic model was established to predict the adsorption efficiency. Under the optimum condition (initial Pb(II) concentration = 110 mg Lâ1, MDA-Fe3O4 dosage = 0.49 g Lâ1, pH = 5 and temperature = 30 °C) a removal percentage of 85.6% was obtained. The isotherm data fitted well to the Freundlich model within the concentration range of the experimental study. A maximum adsorption capacity of 333.3 mg gâ1 was predicted by the Langmuir model. The adsorption rate of Pb(II) ions onto MDA-Fe3O4 was in good agreement with the pseudo-second-order model (R2 = 0.999; k2 = 4.7 Ã 10â4 g mgâ1minâ1). Thermodynamically, adsorption was spontaneous and endothermic. The MDA-Fe3O4 was successfully regenerated using 0.3 M HCl with little loss of adsorption capacity (â7%) for five successive adsorption cycles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 189, December 2017, Pages 291-300
Journal: Chemosphere - Volume 189, December 2017, Pages 291-300
نویسندگان
Fatemeh Jiryaei Sharahi, Afsaneh Shahbazi,