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Controllable Synthesis of Silicalite-1 with Tailored c-Axis Length via KHSO4 and Seed Co-Additive Strategy
Xiaojing Meng1, Liangxu Zhou1, Junwei Huang1
1College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
Materials (Basel, Switzerland)
|June 26, 2026
Summary
Synthesizing Silicalite-1 zeolite with controlled morphology is achieved using a low-template method with potassium bisulfate and seeds. This green approach yields plate-like crystals with excellent methylene blue adsorption and stability.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Zeolite morphology critically influences material performance.
- Controlling zeolite structure is key for targeted applications.
- Existing synthesis methods may be costly or environmentally unfavorable.
Purpose of the Study:
- To develop a low-cost, green synthesis route for morphology-controlled Silicalite-1 (MFI-type zeolite).
- To precisely regulate the crystal size and shape of Silicalite-1.
- To evaluate the performance of the synthesized zeolite for methylene blue adsorption.
Main Methods:
- Low-template synthesis strategy using potassium bisulfate (KHSO4) and seed suspension.
- Synergistic effect of seeds and KHSO4 to control nucleation and crystallization.
- Selective adsorption of sulfate ions to induce preferential crystal growth along the c-axis.
- Optimization of reactant ratios (K+/Si, seed content) and hydrothermal conditions (180 °C for 8 h).
Main Results:
- Achieved precise regulation of Silicalite-1 c-axis size.
- Synthesized well-defined plate-like Silicalite-1 crystals.
- Demonstrated scale-up synthesis in a 2 L autoclave, confirming industrial potential.
- Obtained zeolite with excellent methylene blue adsorption capacity and cyclic stability.
Conclusions:
- The synergistic strategy enables morphology control in low-template Silicalite-1 synthesis.
- The developed method is cost-effective and environmentally friendly.
- The synthesized Silicalite-1 shows promising performance for adsorption applications.
