Investigation of the Adsorption Mechanism of Halogenated Anions in Industrial Wastewaters by Mg/AL Hydroxide Double Layer

Document Type : Research - Paper

Authors

1 M.Sc, Dept. of Mining Engineering, Trabiat Modares University, Tehran, Iran

2 Asssiatant Professor, Dept. of Mining Engineering, Trabiat Modares University, Tehran, Iran

Abstract

In the wastewater of many industrial plants and mining industries, there are halogen compounds such as chlorine, fluorine, bromine and iodine, which can redce the quality of recycled water. One way to remove halogenated anions from wastewaters is to use layered double hydroxides, which have several advantages such as simplicity and low price. In this study, the adsorption properties of layered double magnesium / aluminum hydroxide is investigated by laboratory studies and molecular modeling for fluoride to iodine halogens. Laboratory studies have been performed to compare the ability to absorb different types of halogens by synthetic magnesium aluminum LDH (original and calcinated at 400 ˚C) and molecular modeling studies to understand effective mechanisms for different halogenated anions. The results of laboratory studies showed that both original and calcinated layered magnesium / aluminum hydrochloride have the highest absorption potential for fluoride ions and the lowest absorption for iodide ions. Calcination significantly increases absorption for all types of halogens. The predominant mechanism for the uptake of halogenated anions by non calcinated layered double hydroxides is ion-exchange and in calcinated products, surface and physical absorption. The electronegativity seems to be the determining parameter. The results of the energy calculation of the interaction obtained from the molecular modeling show that the preferred position for all halogens is the hollow hexagonal structure of the double-layer hydroxide. Also, the absorption rate in the hollow hexagonal position is the highest for the fluorine and the lowest for iodine. In addition to confirming the results of laboratory studies, these modelling results confirm the possibility of using molecular modeling methods as a powerful tool in examining the behavior and understanding the process mechanisms.

Keywords

References

  1. Lv, L., Sun, P., Gu, Z., Du, H., Pang, X., Tao, X., and Xu, L. (2009). “Removal of chloride ion from aqueous solution by ZnAl-NO3 layered double hydroxides as anion-exchanger”. Journal of Hazardous Materials, 161(2): 1444-1449.
  2. Kentjono, L., Liu, J. C., Chang, W. C., and Irawan, C. (2010). “Removal of boron and iodine from optoelectronic wastewater using Mg–Al (NO3) layered double hydroxide”. Desalination, 262(1): 280-283.
  3. Hu, Z., Song, X., Wei, C., and Liu, J. (2017). “Behavior and mechanisms for sorptive removal of perfluorooctane sulfonate by layered double hydroxides”. Chemosphere, 187: 196-205.
  4. Theiss, F. L., Couperthwaite, S. J., Ayoko, G. A., and Frost, R. L. (2014). “A review of the removal of anions and oxyanions of the halogen elements from aqueous solution by layered double hydroxides”. Journal of Colloid and Interface Science, 417: 356-368.
  5. Armient, R. (2005). “The many-Electron energy in density functional theory”. Ph.D., KTH Engineering Sciences, KTH School of Engineering Sciences, Stockholm, Sweden.
  6. Tsukanov, A. A., and Psakhie, S. G. (2016). “Energy and structure of bonds in the interaction of organic anions with layered double hydroxide nanosheets: A molecular dynamics study”. Scientific Reports, 6: 19986-19986.
  7. Liu, H.-M., Zhao, X.-J., Zhu, Y.-Q., and Yan, H. (2020). “DFT study on MgAl-layered double hydroxides with different interlayer anions: structure, anion exchange, host–guest interaction and basic sites”. Physical Chemistry Chemical Physics, 22(4): 2521-2529.
  8. Vázquez-Guerrero, A., Alfaro-Cuevas-Villanueva, R., Rutiaga-Quiñones, J. G., and Cortés-Martínez, R. (2016). “Fluoride removal by aluminum-modified pine sawdust: Effect of competitive ions”. Ecological Engineering, 94: 365-379.
  9. Xu, X., Gao, B., Jin, B., and Yue, Q. (2016). “Removal of anionic pollutants from liquids by biomass materials: A review”. Journal of Molecular Liquids, 215: 565-595.
  10. Emeish, S., Abu-Arabi, M., and Hudaib, B. (2012). “Removal of phosphate from Eshidiya industrial wastewater by sedimentation and enhanced sedimentation”. Desalination and Water Treatment, 51: 1-5.
  11. Pacchioni, G. (1996). “Halogen ions adsorption at silver and platinum surfaces: A quantum chemical study”. Electrochimica Acta, 41(14): 2285-2291.
  12. McCrum, I. T., Akhade, S. A., and Janik, M. J. (2015). “Electrochemical specific adsorption of halides on Cu 111, 100, and 211: A Density Functional Theory study”. Electrochimica Acta, 173: 302-309.
  13. Wang, H., Chen, J., Cai, Y., Ji, J., Liu, L., and Teng, H. H. (2007). “Defluoridation of drinking water by Mg/Al hydrotalcite-like compounds and their calcined products”. Applied Clay Science, 35(1): 59-66.
  14. Guo, X., Yin, P., and Yang, H. (2018). “Superb adsorption of organic dyes from aqueous solution on hierarchically porous composites constructed by ZnAl-LDH/Al(OH)3 nanosheets”. Microporous and Mesoporous Materials, 259: 123-133.
Journal of Mineral Resources Engineering
Volume 7, Issue 3 - Serial Number 25
October 2022
Pages 125-137

Files

History

  • Receive Date: 23 December 2020
  • Revise Date: 04 July 2021
  • Accept Date: 15 April 2021

Share

How to cite

Statistics