Preparation of Attapulgite Clay Supported Nano TiO2-Fe3O4 Adsorbent and Removal of Cr(Ⅵ)

doi:10.11944/j.issn.1000-0518.2019.03.180112

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (3): 324-334.DOI: 10.11944/j.issn.1000-0518.2019.03.180112

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Preparation of Attapulgite Clay Supported Nano TiO₂-Fe₃O₄ Adsorbent and Removal of Cr(Ⅵ)

LI Jingping(),YANG Shihai,LIU Yang,BO Wenbo

School of Chemical and Biological Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China

Received:2018-04-13 Accepted:2018-08-13 Published:2019-03-01 Online:2019-02-28
Contact: LI Jingping
Supported by:
Supported by the Gansu Natural Science Foundation(No.3ZX062-B25-002), the Gansu Province Construction Science and Technology Project(No.JK2010-31), the Jinchuan Company Pre-Research Project Fund(No.JCYY2013002)

Abstract

Abstract:

Attapulgite clay(ATP) supported nano TiO₂-Fe₃O₄(TiO₂-Fe₃O₄-ATP) adsorbents were prepared by sol-gel method in one-pot, and its adsorption and desorption properties of Cr(Ⅵ) in simulated wastewater were studied. The structure and contents of the adsorbent were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared spectrometer(FT-IR) and EDS before and after nano TiO₂-Fe₃O₄ loading, The effects of the ratio of reactants, adsorption time, pH value, temperature, dosage and initial concentration on the adsorption rate of Cr(Ⅵ) were studied. The best performance of the adsorbents was observed when the molar fraction of Ti in the total loading is 75%. The attapulgite adsorbent loaded with nano TiO₂ and Fe₃O₄ has better adsorption effect on the removal of Cr(Ⅵ) when the mass of adsorbent is 0.6 g. When the initial concentration of Cr(Ⅵ) is less than 0.8 mg/L and the pH value is 6 at 20 ℃, the adsorption rate of Cr(Ⅵ) reached 79.8%. The adsorption of Cr(Ⅵ) by TiO₂-Fe₃O₄-ATP can be described by Freundlich equation. At 20~40 ℃, the free energy(ΔG), enthalpy(ΔH) and entropy(ΔS) changes of the adsorption process were calculated. The results show that ΔG<0, ΔS=-43.55 J/(mol·K), ΔH=-14.36 kJ/mol, indicating that the adsorption is spontaneous, exothermic and entropy reduction. Pseudo-first-order kinetic model, pseudo-second-order kinetic model and shell progressive model were studied for the kinetic data. The result shows that the adsorption process fits the quasi-second-order kinetic model. The rate control step of adsorption is mainly surface chemical reaction. The adsorption rate of TiO₂-Fe₃O₄-ATP adsorbent can reach more than 65% after 4 times of recycling.

Key words: attapulgite clay, TiO₂, Fe₃O₄, adsorbent

LI Jingping, YANG Shihai, LIU Yang, BO Wenbo. Preparation of Attapulgite Clay Supported Nano TiO₂-Fe₃O₄ Adsorbent and Removal of Cr(Ⅵ)[J]. Chinese Journal of Applied Chemistry, 2019, 36(3): 324-334.

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Preparation of Attapulgite Clay Supported Nano TiO₂-Fe₃O₄ Adsorbent and Removal of Cr(Ⅵ)

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