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Updated: Jun 25, 2026

Preparation of Functional Silica Using a Bioinspired Method
Published on: August 1, 2018
Surface functionalized mesoporous silicas as adsorbents for aromatic contaminants in aqueous solution
Dongqiang Zhu1, Hua Zhang, Qi Tao
1State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu 210093, People's Republic of China.
Hexagonal mesoporous silica (HMS) and its functionalized forms effectively adsorb aromatic and phenolic compounds from water. Aminopropyl-functionalized HMS (AMP-HMS) shows particular promise for removing specific phenols due to electrostatic interactions.
Area of Science:
- Materials Science
- Environmental Chemistry
- Surface Chemistry
Background:
- Adsorption is a key process for water purification.
- Developing efficient adsorbents for organic pollutants is crucial.
- Mesoporous silica materials offer tunable properties for adsorption applications.
Purpose of the Study:
- To synthesize and characterize hexagonal mesoporous silica (HMS) and its functionalized variants (P-HMS, AMP-HMS).
- To investigate the adsorption behavior of these materials towards nonpolar aromatic and phenolic compounds in aqueous solutions.
- To evaluate AMP-HMS as a potential adsorbent for water treatment.
Main Methods:
- Synthesis and characterization of HMS, P-HMS, and AMP-HMS using techniques like N2 adsorption and FTIR.
- Batch adsorption experiments with pyrene, pentachlorobenzene, 2,4-dichlorophenol, pentachlorophenol, and 4-methyl-2,6-dinitrophenol.
- Analysis of adsorption isotherms using the Freundlich model and investigation of pH effects.
Main Results:
- Adsorption isotherms were well-described by the Freundlich model.
- AMP-HMS demonstrated significant adsorption affinity for phenolic compounds, driven by electrostatic interactions.
- Adsorption generally decreased with increasing pH, except for specific phenols on AMP-HMS, showing bell-shaped curves near pKa.
- AMP-HMS exhibited fast adsorption/desorption kinetics (<15 min).
Conclusions:
- Functionalized mesoporous silica, particularly AMP-HMS, shows excellent adsorption capabilities for specific organic pollutants.
- Electrostatic interactions play a critical role in the adsorption of phenolic compounds onto AMP-HMS.
- AMP-HMS is a promising, efficient adsorbent for removing phenolic compounds in water treatment, outperforming activated carbons in kinetics.
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