Simultaneous removal of Zn<sup>2+</sup> and p-nitrophenol from wastewater using nanocomposites of montmorillonite with alkyl-ammonium and complexant

Three types of alkyl-ammonium with different branching chains and three complexants with different functional groups were used to prepare alkyl-ammonium or complexant intercalated montmorillonite nanocomposite (A-Mt or C-Mt). In addition, synergistic intercalated montmorillonite nanocomposites (A/C-Mt) with alkyl-ammonium along with complexant were also prepared. The adsorption performance of the various nanocomposites toward Zn2+ and p-nitrophenol (PNP) from simulated binary wastewater containing both Zn2+ and PNP were systematically investigated. Characterization of Mt nanocomposites showed that both alkyl-ammoniums and complexants were successfully intercalated into the interlayers of Mt. The surfactant loading amounts of the various nanocomposites were also determined and correlated with the resulting expansion of the interlayer spacing. It was found that intercalation of alkane (OTAC) and –SH (CSH) were conducive to the adsorption of Zn2+ while –C2H4NH (TETA) and all alkyl-ammoniums were beneficial for PNP adsorption. The extent of adsorption was found to be controlled primarily by pH, i.e., the higher pH had a good effect on the adsorption of both Zn2+ and PNP. The adsorption process of Zn2+ onto Mt nanocomposites was more in line with the Freundlich model (R2 = 0.99), while the Langmuir model described the adsorption of PNP well (R2 = 0.99). The adsorption kinetics could be well described by the Elovich equation (R2 = 0.98) and the double-constant model (R2 = 0.89). Chemical adsorption was determined to be the dominant process between the contaminant and Mt nanocomposite surfaces.

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Work Title Simultaneous removal of Zn<sup>2+</sup> and p-nitrophenol from wastewater using nanocomposites of montmorillonite with alkyl-ammonium and complexant
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Open Access
Creators
  1. Guifang Wang
  2. Huizhen Xiao
  3. Jinliang Zhu
  4. Hongyuan Zhao
  5. Kun Liu
  6. Shaojian Ma
  7. Shuai Zhang
  8. Sridhar Komarneni
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Environmental Research
Publication Date October 1, 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.envres.2021.111496
Deposited November 20, 2021

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  • Created
  • Added Revised_manuscript_with_changes_marked.docx
  • Added Creator Guifang Wang
  • Added Creator Huizhen Xiao
  • Added Creator Jinliang Zhu
  • Added Creator Hongyuan Zhao
  • Added Creator Kun Liu
  • Added Creator Shaojian Ma
  • Added Creator Shuai Zhang
  • Added Creator Sridhar Komarneni
  • Published
  • Updated
  • Updated
  • Updated