Magnetic AMP@SiO2 Adsorbent

Direct Vitrification After Uptake

After Sr uptake, the spent adsorbent can be directly vitrified via microwave without complex separation, enabling low-secondary-waste immobilization.

Liu, Jiao · Shi, Keyou · Liu, Yong · Yang, Yang · Chen, Jie · 79904439 · Xie, Yupeng

Environmental Research 2026

Specifications

Maximum adsorption capacity

{'zh': '38.64', 'en': '38.64'} mg·g⁻¹

Normalized Sr²⁺ leaching rate

{'zh': '4.19×10⁻⁶', 'en': '4.19×10⁻⁶'} g·m⁻²·d⁻¹

Density

{'zh': '2.72', 'en': '2.72'} g·cm⁻³

Advantages

Direct vitrification after uptake

The saturated adsorbent can be directly mixed with glass formers and microwave-heated to form iron phosphate glass, simplifying the process and avoiding secondary waste.

Very low leaching rate

The optimized sample shows a normalized Sr leaching rate of only 4.19×10⁻⁶ g·m⁻²·d⁻¹ over 42 days, indicating strong immobilization of strontium in the glass network.

Predictable long-term behavior

Gaussian Process Regression with 200 bootstrap resampling iterations models the release behavior and quantifies extrapolation uncertainty, supporting safety assessment.

Applications

• Radioactive Wastewater Treatment：Replace conventional precipitation or ion exchange by direct addition and magnetic separation, reducing secondary waste.
• Radionuclide Adsorption：Use AMP's high selectivity for strontium and magnetic recovery for rapid solid-liquid separation, simplifying the process.
• Radioactive Waste Vitrification：The saturated adsorbent serves as a vitrification precursor, converted by microwave heating into stable iron phosphate glass for waste minimization.