[Preparation of MgO Modified Lotus Shell Biochar and Its Phosphorus Adsorption Characteristics]

Area of Science:

• Environmental Chemistry
• Materials Science

Context:

• Phosphate pollution from anthropogenic activities leads to eutrophication.
• Biochar is a potential adsorbent, but its efficiency needs enhancement.
• Developing novel adsorbents is crucial for water remediation.

Purpose:

• To synthesize and characterize nano-magnesium oxide-biochar (MgO-biochar) for phosphate adsorption.
• To investigate the effect of MgO modification and CO2 atmosphere on biochar's adsorption performance.
• To evaluate the adsorption capacity and mechanism of MgO-biochar for phosphate removal.

Summary:

• Nano-MgO-biochar was prepared using rapid pyrolysis of MgO and lotus shells.
• MgO nanoparticles supported on biochar significantly increased phosphate adsorption sites and capacity.
• MgO-biochar prepared under a CO2 atmosphere exhibited superior adsorption, reaching up to 297.96 mg·g-1.
• Adsorption kinetics followed a pseudo-second-order model, indicating chemical adsorption dominance.

Impact:

• MgO-biochar demonstrates high-efficiency phosphate adsorption capabilities.
• This material offers a promising solution for controlling water eutrophication.
• The study highlights the potential of modified biochar in environmental remediation applications.