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Mechanochemically synthesized Al-Fe (oxide) composite with superior reductive performance: Solid-state kinetic
Qianfeng Li1, Shiying Yang2, Sui Wu3
1Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao, 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.
Chemosphere
|March 14, 2022
Summary
Mechanical ball milling (BM) activated aluminum (Al) with iron sulfate to create a composite for water treatment. This study clarifies the mechanochemical processes and reaction mechanisms involved in its synthesis and application.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Mechanical ball milling (BM) is a green method to enhance zero-valent metals (ZVMs) for water treatment.
- The solid-state reaction mechanisms during BM activation of ZVMs remain poorly understood, limiting process optimization.
Purpose of the Study:
- To synthesize and characterize an Al-Fe (oxide)bm composite using BM for water treatment.
- To elucidate the mechanochemical processes and solid-state reaction mechanisms involved in composite formation.
Main Methods:
- Activation and modification of microscale zero-valent aluminum (mZVAl) using FeSO4·7H2O via BM.
- Kinematic analysis to determine the influence of BM parameters (speed, time) on reaction extent.
- Kinetic fitting to identify the solid-state reaction mechanism.
Main Results:
- Synthesized Al-Fe (oxide)bm composite exhibited superior reactivity and reusability for contaminant removal.
- Iron oxide layer formation on mZVAl was attributed to mechanochemical reactions influenced by impact and input energy.
- Reaction kinetics followed three-dimensional diffusion and phase boundary reaction models.
Conclusions:
- BM is an effective method for synthesizing reactive Al-Fe (oxide)bm composites for water treatment.
- Understanding the mechanochemical process and reaction kinetics optimizes ZVM-based composite synthesis.
- This research advances the application of ZVM composites in treating polluted water and wastewater.
