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Related Experiment Video

Updated: Jun 12, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Rice Husk-Derived MCM-41 for Efficient Hg(II) Removal: Performance, Mechanism, and Environmental Safety in Real Water

Naren Bocanegra1, Marcela Paredes-Laverde2, Nancy Acelas3

  • 1Grupo de Investigación en Química Aplicada a Procesos Ecológicos (QUAPE-UT), Facultad de Ciencias, Universidad del Tolima, Ibagué 730006, Colombia.

Nanomaterials (Basel, Switzerland)
|June 11, 2026
PubMed
Summary

Rice husk-derived Mobil Composition of Matter No. 41 (MCM-41) effectively removes mercury (Hg(II)) from water. This sustainable adsorbent shows high efficiency and reusability, though challenges remain in complex industrial wastewater.

Keywords:
adsorptionagro-industrial wasteecosystem protectionheavy metalmesoporous material

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Last Updated: Jun 12, 2026

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Area of Science:

  • Environmental Science
  • Materials Science
  • Water Treatment

Background:

  • Mercury contamination in water presents significant environmental and health hazards.
  • Efficient and sustainable methods are crucial for removing mercury (Hg(II)) from aqueous systems.
  • Rice husk (RH) and its derivatives are explored as potential low-cost adsorbents.

Purpose of the Study:

  • To evaluate rice husk-derived materials, specifically Mobil Composition of Matter No. 41 (MCM-41), for Hg(II) removal.
  • To determine the adsorption performance, kinetics, and thermodynamics of MCM-41.
  • To assess the adsorbent's applicability, reusability, and environmental safety in various water matrices.

Main Methods:

  • Screening of adsorbents including rice husk (RH), rice ash (RHA), and MCM-41 for Hg(II) removal.
  • Optimization of adsorption conditions: pH, adsorbent dosage, and initial Hg(II) concentration.
  • Kinetic and isotherm modeling (pseudo-second-order, Langmuir), thermodynamic analysis, and ecotoxicity assays (Daphnia magna, Lactuca sativa).

Main Results:

  • MCM-41 demonstrated superior Hg(II) adsorption, achieving up to 98% removal under optimal conditions.
  • Adsorption followed pseudo-second-order kinetics and Langmuir isotherm, with a maximum capacity of 0.80 mg g-1.
  • The process was spontaneous and exothermic; MCM-41 showed good reusability over four cycles but faced competition in complex matrices.

Conclusions:

  • Rice husk-derived MCM-41 is a highly effective and sustainable adsorbent for Hg(II) removal from water.
  • The adsorbent exhibits favorable adsorption characteristics and reusability, making it a promising material for water remediation.
  • Further research is needed to address residual toxicity in industrial wastewater and optimize performance in complex water matrices.