Loading…
A novel and cost-effective synthesis of magnetic zeolite 4A using kaolinite and red mud for Sr(II) removal
A novel and cost-effective approach was successfully developed for synthesizing high-performance zeolite 4A encapsulating magnetic particles (magnetic zeolite 4A) using kaolinite and red mud as raw materials via one-step combined activation-reduction and subsequent hydrothermal synthesis. The concur...
Saved in:
Published in: | Microporous and mesoporous materials 2024-04, Vol.370, p.113069, Article 113069 |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | A novel and cost-effective approach was successfully developed for synthesizing high-performance zeolite 4A encapsulating magnetic particles (magnetic zeolite 4A) using kaolinite and red mud as raw materials via one-step combined activation-reduction and subsequent hydrothermal synthesis. The concurrent reduction of iron compounds in red mud to magnetic particles mainly composed of Fe3O4 during the thermal activation of kaolinite eliminated the need for a distinct red mud reduction process, thereby streamlining the synthesis and maximizing efficiency. The resulting product comprised highly crystalline zeolite 4A encapsulating magnetic particles derived from the red mud, avoiding oxidation and corrosion of the magnetic material in acidic solutions. A series of magnetic zeolite 4A (MZ) were obtained by introducing varying percentages of red mud and kaolinite, and their morphological, structural, magnetic and adsorption properties were investigated. The BET specific surface area of the obtained MZ-20 is 13.6 m2/g. MZ-20 (red mud: kaolinite mass percentage is 20%) displayed the maximum adsorption capacity of 172 mg/g for Sr(II). Within 1 h, 96.4% of the Sr(II) was removed. The adsorption kinetics and isotherms followed the pseudo-second-order and Langmuir models, respectively. Using a mixed 0.1 M NaCl and 0.1 M HCl solution as eluent, the magnetic adsorbent maintained high desorption and regeneration ratios along with stable magnetic properties after four adsorption-desorption cycles. In summary, the MZ-20 adsorbent exhibited high adsorption capacity, recyclability and excellent magnetic properties, making it a decontamination candidate for removing Sr(II) from radioactive wastewater.
An efficient and low-cost approach was successfully developed to synthesize magnetic zeolite adsorbents with high magnetic performance using kaolinite and red mud as raw materials via an one-step activation-reduction method, which was subsequently applied to the removal of strontium from radioactive wastewater. SEM and HRTEM revealed that most of the reduced red mud nanoparticles were enclosed within the zeolite crystals. Experimental results indicated that the maximum adsorption capacity of magnetic zeolite adsorbent MZ-20 for Sr(II) was 172 mg/g at 25 °C. The magnetic adsorbent maintained high desorption and regeneration ratios along with stable magnetic properties after four adsorption-desorption cycles. The results indicated that magnetic zeolite 4A is a promising adsorbent f |
---|---|
ISSN: | 1387-1811 1873-3093 |
DOI: | 10.1016/j.micromeso.2024.113069 |