Removal of orange G via environmentally friendly GO@Fe3O4-COOH@NH2-MIL-101(Fe) nanocomposite
Hui Huang, Bin Huang, Yichun Huang, Jinbei Yang, Yinnv Ye, Yucheng Chen · Desalination and Water Treatment · 2021
Attractive environmentally friendly magnetic metal-organic framework (MOF) nanocomposite GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) was synthesized by a solvothermal method and characterized by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, Brunauer-Emmett-Teller, and vibrating sample magnetometer, and used as an effective adsorbent for the removal of orange G from aqueous solution.The various operating parameters that effect the adsorption process, such as adsorbent dosage (0.01-0.2 g), pH (1.0-10.0),initial concentration (50-400 mg L -1 ), and temperature (298.15-318.15K) were studied.The percent removal of orange G increases with the increment of the adsorbent dosage and decrease of the initial concentration, and the optimum pH is 6.0.The Redlich-Peterson model can be favorably applied to describe the adsorption equilibrium data, indicating that the surfaces of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite for the orange G adsorption are made up of homogeneous adsorption patches.The adsorption kinetics indicate that the adsorption process of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) toward orange G obeys the pseudo-second-order model and the activation energy is 16.5 kJ mol -1 .Thermodynamic parameters, ΔH = 39.81 kJ mol -1 , ΔS = -46.80J mol -1 K -1 , and ΔG < 0, exhibit that the adsorption is exothermic and spontaneous.The maximum adsorption capacity of orange G onto GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite is 128.8 mg g -1 .Therefore, magnetic GO@ Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite can be employed as an environmentally friendly and efficient adsorbent for the orange G removal from wastewater.