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Efficient Removal of Nitrate in Neutral Solution Using Zero-Valent Al Activated by Soaking
Yi-Gong Dai1,2, Xiao-Han Guo1,2, Gen-Wang Ma1,2
1Energy Materials & Physics Group, Department of Physics, Shanghai University, Shanghai 200444, China.
Soaked aluminum powder effectively removes nitrate from water in neutral solutions. This activated aluminum reduces over 90% of nitrate within two hours, offering a promising water treatment method.
Area of Science:
- Environmental Science
- Water Chemistry
- Materials Science
Background:
- Nitrate contamination in surface water poses significant human health risks.
- Zero-valent iron is effective for nitrate reduction but requires acidic conditions.
- Zero-valent aluminum offers a lower redox potential but is hindered by a passive oxide film.
Purpose of the Study:
- To investigate the efficacy of activated aluminum for nitrate reduction in neutral aqueous solutions.
- To determine the optimal conditions for nitrate removal using activated aluminum.
- To elucidate the mechanism behind the enhanced nitrate reduction by activated aluminum.
Main Methods:
- Metal aluminum powder was activated by soaking in deionized water.
- Nitrate reduction efficiency was tested in neutral solutions at varying temperatures and aluminum dosages.
- Mechanism of nitrate reduction was analyzed using surface characterization techniques.
Main Results:
- Soaked aluminum efficiently reduced nitrate (up to 100 mg L-1) in neutral solutions.
- Over 90% nitrate removal was achieved within approximately 2 hours at 50 °C with optimal soaking.
- Nitrate reduction efficiency increased with temperature and aluminum dosage, converting nitrate primarily to ammonia ions.
Conclusions:
- Soaking is an effective method to activate aluminum for nitrate removal in neutral water.
- Activated aluminum offers a viable alternative to iron-based methods, overcoming the need for acidic conditions.
- The loose Al(OH)3 layer formed during soaking enhances electron transfer, leading to efficient nitrate reduction.
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