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<p>The maximum limit for dissolved iron allowed to be in the drinking water is (0.3&#xa0;mg/L). Ferric chloride is an important coagulant which used in drinking water treatment plants. The removal of residual Fe<sup>3+</sup> is required after the treatment process. Therefore, the presented work studied the removal of Fe<sup>3+</sup> from FeCl<sub>3</sub> aqueous solutions by using a novel nanocomposites (Nano ZnO/MWCNTs) which had been synthesized by the arc discharge method at (I<sub>ac</sub>=15&#xa0;A, 70&#xa0;V and 25&#xa0;°C) in deionized water. TEM, XRD, EDX and FTIR have confirmed the synthesizing success. The average nano size of Nano ZnO and outer diameter of MWCNTs were 15.68 and 18.03&#xa0;nm, respectively. The optimum dose was (5.0&#xa0;mg/100&#xa0;mL) with shaking at 200&#xa0;rpm in an alkaline medium for a contact time of 60&#xa0;min. The Fe<sup>3+</sup> concentration was reduced from 1.0120 to 0.1646&#xa0;mg/L at (pH = 7.0) and from 4.020 to 0.9947&#xa0;mg/L at (pH = 9.0) and from 6.060 to 0.6749&#xa0;mg/L at (pH = 12.0). The high maximum adsorption capacity of Fe<sup>3+</sup> on the surface of (Nano ZnO/MWCNTs) is 258.78&#xa0;mg/g according to Langmuir isotherm model at (pH = 12.0). This adsorption is a multilayer physical process according to Freundlich isotherm model and an exothermic process according to Temkin isotherm model. Moreover, this adsorption obeys pseudo-first order kinetic model and Intra-particle diffusion kinetic model. Nano ZnO/MWCNTs is suitable for drinking water treatment from Fe<sup>3+</sup> at pH = 7 and pH = 8. It can be used for polluted water treatment from Fe<sup>3+</sup> before discharging it in to rivers or lakes at (pH = 9.0).</p> Graphical Abstract <p></p>

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Preparation of the Nanocomposites (Nano ZnO/Multi Wall CNTs) by the Arc Discharge Method for Adsorbing (Fe3+) from Water Samples Contain FeCl3 Salt

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  • 发表日期：

    2025年3月19日

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  • Ibrahim Bondouk,
  • Kh. M. Omar,
  • Ahmed M. ElKhatib,
  • Ahmed Hamdy,
  • Mostafa Elkhatib

摘要

The maximum limit for dissolved iron allowed to be in the drinking water is (0.3 mg/L). Ferric chloride is an important coagulant which used in drinking water treatment plants. The removal of residual Fe3+ is required after the treatment process. Therefore, the presented work studied the removal of Fe3+ from FeCl3 aqueous solutions by using a novel nanocomposites (Nano ZnO/MWCNTs) which had been synthesized by the arc discharge method at (Iac=15 A, 70 V and 25 °C) in deionized water. TEM, XRD, EDX and FTIR have confirmed the synthesizing success. The average nano size of Nano ZnO and outer diameter of MWCNTs were 15.68 and 18.03 nm, respectively. The optimum dose was (5.0 mg/100 mL) with shaking at 200 rpm in an alkaline medium for a contact time of 60 min. The Fe3+ concentration was reduced from 1.0120 to 0.1646 mg/L at (pH = 7.0) and from 4.020 to 0.9947 mg/L at (pH = 9.0) and from 6.060 to 0.6749 mg/L at (pH = 12.0). The high maximum adsorption capacity of Fe3+ on the surface of (Nano ZnO/MWCNTs) is 258.78 mg/g according to Langmuir isotherm model at (pH = 12.0). This adsorption is a multilayer physical process according to Freundlich isotherm model and an exothermic process according to Temkin isotherm model. Moreover, this adsorption obeys pseudo-first order kinetic model and Intra-particle diffusion kinetic model. Nano ZnO/MWCNTs is suitable for drinking water treatment from Fe3+ at pH = 7 and pH = 8. It can be used for polluted water treatment from Fe3+ before discharging it in to rivers or lakes at (pH = 9.0).

Graphical Abstract