Efficient removal of aqueous Pb(II) using partially reduced graphene oxide-Fe 3 O 4
Partially reduced graphene oxide-Fe 3 O 4 composite was prepared through in situ co-precipitation and used as an efficient adsorbent for removing Pb(II) from water. The composites were characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectra,...
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Published in | Adsorption science & technology Vol. 36; no. 3-4; pp. 1031 - 1048 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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01.05.2018
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Abstract | Partially reduced graphene oxide-Fe 3 O 4 composite was prepared through in situ co-precipitation and used as an efficient adsorbent for removing Pb(II) from water. The composites were characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectra, Fourier transformation infrared, Raman spectrometer, N 2 adsorption–desorption, vibrating sample magnetometer, and zeta potential analyses. The impacts of pH, contact time, adsorbent dosage, temperature, and foreign substances on Pb(II) adsorption performance were investigated. The adsorption mechanism, kinetics, and thermodynamics were analyzed. The results indicate that Fe 3 O 4 is homogeneously anchored inside the thin graphene sheets, with a particle size of 15–20 nm, resulting in a very low remanence and coercivity. The composite shows excellent and efficient adsorption performance toward aqueous Pb(II): adsorption equilibrium was reached in 10 min with the adsorption percent and quantity of 95.77% and 373.14 mgċg −1 , respectively, under a condition of pH = 6, adsorbent dosage 250 mgċL −1 , and Pb(II) initial concentration 97.68 mgċL −1 , with the subsequent magnetic separation taking only 10 s. The adsorption performance is dependent on adsorbent dosage. A lower dosage favors a higher adsorption quantity, implying a strong adsorptive potential for partially reduced graphene oxide-Fe 3 O 4 . The adsorption quantity reached 777.28 mgċg −1 , given the dosage 100 mgċL −1 . The adsorption is monolayer chemisorption, the whole process of which is controlled by chemisorption and liquid film diffusion. In terms of thermodynamics, the adsorption is an exothermic and spontaneous process. |
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AbstractList | Partially reduced graphene oxide-Fe 3 O 4 composite was prepared through in situ co-precipitation and used as an efficient adsorbent for removing Pb(II) from water. The composites were characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectra, Fourier transformation infrared, Raman spectrometer, N 2 adsorption–desorption, vibrating sample magnetometer, and zeta potential analyses. The impacts of pH, contact time, adsorbent dosage, temperature, and foreign substances on Pb(II) adsorption performance were investigated. The adsorption mechanism, kinetics, and thermodynamics were analyzed. The results indicate that Fe 3 O 4 is homogeneously anchored inside the thin graphene sheets, with a particle size of 15–20 nm, resulting in a very low remanence and coercivity. The composite shows excellent and efficient adsorption performance toward aqueous Pb(II): adsorption equilibrium was reached in 10 min with the adsorption percent and quantity of 95.77% and 373.14 mgċg −1 , respectively, under a condition of pH = 6, adsorbent dosage 250 mgċL −1 , and Pb(II) initial concentration 97.68 mgċL −1 , with the subsequent magnetic separation taking only 10 s. The adsorption performance is dependent on adsorbent dosage. A lower dosage favors a higher adsorption quantity, implying a strong adsorptive potential for partially reduced graphene oxide-Fe 3 O 4 . The adsorption quantity reached 777.28 mgċg −1 , given the dosage 100 mgċL −1 . The adsorption is monolayer chemisorption, the whole process of which is controlled by chemisorption and liquid film diffusion. In terms of thermodynamics, the adsorption is an exothermic and spontaneous process. |
Author | Li, Bo Sun, He Guo, Ting Ge, Xin Zhang, Bangwen Zhao, Zhiwei Xing, Ruiguang Bulin, Chaoke Yu, Huitao |
Author_xml | – sequence: 1 givenname: Ting surname: Guo fullname: Guo, Ting organization: College of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 2 givenname: Chaoke surname: Bulin fullname: Bulin, Chaoke organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 3 givenname: Bo surname: Li fullname: Li, Bo organization: Institute of Functional materials, Central Iron and Steel Research Institute, Beijing, People's Republic of China – sequence: 4 givenname: Zhiwei surname: Zhao fullname: Zhao, Zhiwei organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 5 givenname: Huitao surname: Yu fullname: Yu, Huitao organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 6 givenname: He surname: Sun fullname: Sun, He organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 7 givenname: Xin surname: Ge fullname: Ge, Xin organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 8 givenname: Ruiguang surname: Xing fullname: Xing, Ruiguang organization: College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China – sequence: 9 givenname: Bangwen surname: Zhang fullname: Zhang, Bangwen organization: Analysis and Testing Center, Inner Mongolia University of Science and Technology, Baotou, People's Republic of China |
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