Abating ammonia emission from poultry manure by Pt/TiO₂ modified corn straw

Area of Science:

• Environmental Science
• Agricultural Science
• Materials Science

Background:

• Poultry manure is a major source of ammonia (NH3) emissions, negatively impacting human health, ecosystems, and agricultural economics.
• Ammonia mitigation is crucial for sustainable agriculture and environmental protection.

Purpose of the Study:

• To develop an effective and sustainable method for reducing ammonia emissions from poultry manure.
• To investigate the efficacy of modified corn straw (CS) as an adsorbent for ammonia.

Main Methods:

• Corn straw was modified with 1 wt% Pt/TiO2 catalysts using low-temperature partial-oxidation technology.
• The modified CS was added to poultry manure at concentrations of 20-50% to assess ammonia uptake.
• Techniques including XPS, NH3-TPD, H2-TPR, O2-TPD, and d-band theory were used for mechanistic studies.

Main Results:

• Pt/TiO2 catalysts lowered activation energy, enabling exothermic processes at reduced temperatures.
• Modified CS exhibited significantly higher ammonia uptake compared to original CS at optimal conditions (220 °C).
• Incorporating 20-50% modified CS into poultry manure reduced ammonia emissions by 54.1-98.6%.

Conclusions:

• Modified corn straw with Pt/TiO2 is a highly effective material for mitigating ammonia emissions from poultry manure.
• Ammonia adsorption is primarily driven by functional groups on the modified CS, with stable amide and amine bond formation.
• This approach presents a sustainable and economically viable solution for agricultural ammonia pollution.