Enhancing Water Purification: Innovations with Mn-doped Fe2O3 Microflowers on Biochar

The study explores Mn-doped Fe2O3 microflowers on plasma-treated biochar (MnFe2O3/PCRH) for removing Cu2+ and Cd2+ from water. Enhanced by cold plasma, this composite surpasses traditional biochar, offering higher adsorption capacities and economic reusability through complex surface interactions and chemisorption mechanisms.

April 14, 2024

1–2 minutes

Kandel, et al (2024) Decoration of dandelion-like manganese-doped iron oxide microflowers on plasma-treated biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More for alleviation of heavy metal pollution in water. *Chemosphere.* https://doi.org/10.1016/j.chemosphere.2024.141757

The study introduces a novel composite, manganese-doped iron oxide microflowers on plasma-treated carbonized rice husk (MnFe2O3/PCRH), showcasing significant advancements in water purification technology. This material is designed to tackle the pervasive issue of heavy metal pollution, specifically targeting copper (Cu2+) and cadmium (Cd2+) ions, which pose serious environmental and health risks.

The MnFe2O3/PCRH composite was synthesized through a hydrothermal method that anchors Mn-doped Fe2O3 microflowers onto the surface of carbonized rice husk treated with cold plasma. This treatment enhances the biochar’s surface characteristics, providing active sites for metal adsorption and increasing the material’s overall efficiency.

Comprehensive characterization techniques such as XRD, FTIR, FESEM, EDX, HR-TEM, XPS, BET, TGA, and zeta potential analyses were employed to scrutinize the composite’s physical and chemical properties. These studies confirmed the successful doping of Mn and the robust attachment of microflowers to the biochar surface.

The adsorption capacity of MnFe2O3/PCRH was meticulously evaluated through batch trials, revealing a superior performance over untreated biochar with maximum capacities of 122.8 mg/g and 102.5 mg/g for Cu2+ and Cd2+, respectively. Kinetic studies suggested that chemisorption is the predominant mechanism, facilitated by the composite’s physicochemical properties.

The adsorption process involves complex interactions, including surface complexation, ion exchange, and electrostatic attraction, which are crucial for the high removal rates of Cu2+ and Cd2+. The reusability tests further demonstrated the composite’s economic viability, maintaining about 70% efficiency after five cycles.

This development not only provides a sustainable solution to heavy metal contamination but also leverages low-cost biowaste, thus offering a double-edged sword against environmental pollution and waste management challenges. The insights gained from this study underline the potential of MnFe2O3/PCRH in improving water purification systems, making it a promising candidate for future applications in environmental remediation.