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Related Concept Videos

Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

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Interfacial adsorption behavior of amine-functionalized MCM-41 for Mo(VI) capture from aqueous solution.

Baoxun Zhao1, Yaming Wang2, Xin Luo2

  • 1School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China; Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, China; The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education, Zhengzhou, 450001, China.

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|January 11, 2025
PubMed
Summary

Amino-functionalized MCM-41 effectively removes molybdenum(VI) from wastewater. This adsorbent shows high capacity and fast kinetics, offering a promising solution for molybdenum remediation.

Keywords:
APTESAdsorptionDFTMCM-41Mo(VI)Modification

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Molybdenum contamination in wastewater poses significant environmental risks.
  • Existing silica adsorbents require enhanced porosity and chemical interactions for effective molybdenum removal.
  • Amino groups are effective in binding metal oxyanions like molybdenum.

Purpose of the Study:

  • To investigate the adsorption performance and mechanism of amino-functionalized MCM-41 for molybdenum(VI) removal.
  • To develop an efficient method for remediating molybdenum-contaminated wastewater.
  • To understand the interactions between amino-functionalized MCM-41 and molybdenum(VI).

Main Methods:

  • Synthesis of amino-functionalized MCM-41.
  • Adsorption experiments with molybdenum(VI) solutions.
  • Kinetic and thermodynamic analysis (pseudo-second-order, Langmuir model).
  • Spectroscopic characterization (e.g., FTIR, BET).
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Amino-functionalized MCM-41 retains its mesoporous structure with a positively charged surface.
  • Adsorption equilibrium was reached within 20 minutes, following pseudo-second-order kinetics (R²=0.9999).
  • A maximum adsorption capacity of 242.33 mg/g was achieved.
  • Adsorption is spontaneous, single-layered, and driven by charge attraction, hydrogen bonding, and coordination.
  • DFT confirmed the role of chelation between amino and silanol groups in molybdenum adsorption.

Conclusions:

  • Amino-functionalized MCM-41 is a highly effective adsorbent for molybdenum(VI) removal.
  • The adsorption mechanism involves physical and chemical interactions, including chelation.
  • This material shows significant promise for the remediation of molybdenum-contaminated wastewater.
  • The study provides insights into adsorbent design for effective heavy metal removal.