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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
Fe3+ and amino functioned mesoporous silica: preparation, structural analysis and arsenic adsorption
Jun-Chao Zuo1, Sheng-Rui Tong, Xiao-Lin Yu
1State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, PR China.
Journal of Hazardous Materials
|August 25, 2012
Summary
Novel silica gel adsorbents modified with amine and iron effectively remove toxic arsenic species from drinking water. These materials offer a promising solution for water purification, addressing concerns about arsenic contamination.
Area of Science:
- Materials Science
- Environmental Chemistry
- Water Treatment
Background:
- Arsenic contamination in drinking water poses a significant global health risk.
- Existing methods for arsenic removal can be costly or inefficient.
- Development of novel, high-performance adsorbents is crucial for effective water purification.
Purpose of the Study:
- To synthesize and characterize novel adsorbents for the removal of arsenate (As(V)) and arsenite (As(III)) from drinking water.
- To investigate the adsorption mechanisms and efficiency of these new materials.
- To evaluate the influence of common anions on the adsorption performance.
Main Methods:
- Sol-gel synthesis of silica gel with two-step acid-base catalysis.
- Grafting of monoamine and diamine, followed by Fe(3+) coordination to create novel adsorbents.
- Characterization using N(2) adsorption isotherms, FTIR, XPS, and NMR.
- Adsorption studies using Langmuir and Freundlich models to assess removal efficiency and mechanism.
- Investigation of interference from chloride and sulfate anions.
Main Results:
- The synthesized adsorbents exhibited a mesoporous structure, large specific surface area, and high amino and iron content.
- Both adsorbents demonstrated very high removal ability and adsorption rates for both arsenate and arsenite.
- Adsorption isotherms were well-fitted by Langmuir and Freundlich models, indicating chemisorption and physisorption mechanisms.
- The presence of chloride and sulfate anions showed varying effects on the removal efficiency for As(V) and As(III).
Conclusions:
- Novel amine- and iron-functionalized silica gel adsorbents are effective for removing both arsenate and arsenite from water.
- The materials possess favorable structural properties and high adsorption capacities for arsenic species.
- Understanding adsorption mechanisms and anion interference is key to optimizing water treatment strategies using these adsorbents.
