Enhancing the Immobilization of Hexavalent Chromium by the Interlayer Anion Adsorption of the Brucite-Transformed LDH in the Presence of Aluminum Ions

Xiaoduo Chen, Lianyang Huang, Zheng Li, Binfeng Chen, Menglu Zhang, Chunshan Wu, Pengchen Ma and Weifang Zhang ()
Additional contact information
Xiaoduo Chen: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China
Lianyang Huang: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China
Zheng Li: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China
Binfeng Chen: Department of Foreign Languages, Fuzhou University Zhicheng College, Fuzhou 350002, China
Menglu Zhang: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China
Chunshan Wu: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China
Pengchen Ma: Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China
Weifang Zhang: College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, China

Sustainability, 2023, vol. 15, issue 14, 1-13

Abstract: Current studies of chromium adsorption kinetics at the solid–liquid interface often neglect the influence of coexisting ions in complex wastewaters. Thus, it is critical to explore the hexavalent chromium Cr(VI) adsorption kinetics of solid-phase brucite (Mg(OH) 2 ) in liquid-phase wastewater containing coexisting aluminum ions (Al(III)). This paper reveals that the presence of Al(III) significantly enhanced the Cr(VI) adsorption efficiency onto Mg(OH) 2 , with a peak of up to 91% compared to 5% for the absence of Al(III). The main reason for this enhancement was the initial surface ternary complexation of Mg(OH) 2 and the cationic (Al(III)) isomorphic substitution to form Mg(II)-Al(III) layered double hydroxides (LDH), which also indicates a solid-phase transition on the surface of Mg(OH) 2 , which led to electrostatic adsorption in the gallery and made Cr(VI) immobilized and not readily released. Further calculation and analysis of the adsorption energy confirmed the mechanism of Cr(VI) adsorption. It was also concluded that Cr(VI) migration in Mg(OH) 2 -containing minerals was affected by the phase transformation of solids in the presence of Al(III). Hence, this study not only reveals the adsorption mechanism during the treatment of composite pollutant wastewater but also provides the methodological reference for brucite synergistic adsorption to remove heavy metal ions and purify and treat complex polluted wastewater.

Keywords: brucite (Mg(OH) 2 ); Cr(VI); adsorption; layered double Mg(II)-Al(III)-hydroxides; co-existing ions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/14/11173/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/14/11173/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2023:i:14:p:11173-:d:1196381

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().