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Journal of Shanghai University >

2021 , Vol. 27 >Issue 4: 686 - 695

DOI: https://doi.org/10.12066/j.issn.1007-2861.2176

Research Articles

Preparation, phosphorus removal performance and mechanism of lanthanum oxide/expanded graphite composite adsorbents

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  • School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

Received date: 2018-05-17

  Online published: 2021-07-22

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Abstract

To obtain a highly efficient phosphate removal adsorbent, lanthanum oxide/expanded graphite composite adsorbents were prepared from LaOH load-expanded graphite (EG-LaOH) at 340, 500 and 750 $^\circ$C, namely EG-LaO-340, EG-LaO-500 and EG-LaO-750, respectively. The phosphate removal performances of EG-LaO-340, EG-LaO-500 and EG-LaO-750 were investigated using adsorption kinetics and isotherm experiments. The dephosphorization of the adsorbents was found to be distinctly affected by the preparation temperature, with EG-LaO-340 having the optimal adsorption rate and adsorption capacity. The phosphorus removal mechanism of EG-LaO-340 was investigated by studying its thermodynamics and the pH dependence of adsorption. Additionally, scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to characterise the adsorbents. Adsorption was found to be an endothermic and spontaneous process. Electrostatic and Lewis acid-base interactions, in addition to ion exchange, were found to be the main mechanisms of phosphate adsorption.

Key words： phosphorus removal; lanthanum oxide; expanded graphite (EG); adsorption; mechanism

Cite this article

JIN Suwan, NIU Weiya, ZHANG Ling, MAO Xianyong . Preparation, phosphorus removal performance and mechanism of lanthanum oxide/expanded graphite composite adsorbents[J]. Journal of Shanghai University, 2021 , 27(4) : 686 -695 . DOI: 10.12066/j.issn.1007-2861.2176

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