Eleryan, et al (2024) Mandarin biochar-CO-TETA was utilized for Acid Red 73 dye adsorption from water, and its isotherm and kinetic studies were investigated. Scientific Reports. https://doi.org/10.1038/s41598-024-62870-x

The pressing issue of industrial pollution, especially from dye waste, calls for innovative and cost-effective solutions. One promising approach is using 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, a charcoal-like substance obtained from biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More, for water purification. Recent research has focused on creating an efficient adsorbent from mandarin peel waste to remove Acid Red 73 (AR73) dye from water.

Researchers developed a novel biochar from mandarin peels, termed Mandarin Biochar-CO-TETA (MBCOT). This process involved dehydrating the mandarin peels with sulfuric acid, oxidizing with hydrogen peroxide, and aminating with triethylenetetramine. The resulting MBCOT showed significant promise in adsorbing AR73 dye, a common yet harmful dye in industrial wastewater.

The study determined that the best conditions for removing AR73 dye were at a pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More of 1.5, with a dye concentration of 100 mg/L, a biochar dosage of 1.5 g/L, and a contact time of 150 minutes. Under these conditions, the removal efficiency reached 98.08%. MBCOT demonstrated a maximum adsorption capacity of 140.85 mg/g, making it highly effective compared to other adsorbents. The pseudo-second-order (PSO) kinetic model best described the adsorption process, indicating chemisorption involving electron sharing or exchange between the dye and biochar. The Langmuir isotherm model, which assumes monolayer adsorption on a homogenous surface, fit the data well.

Biochar offers several benefits as an adsorbent for dye removal: utilizing agricultural waste like mandarin peels reduces the cost compared to conventional activated carbonActivated carbon is a form of carbon that has been processed to create a vast network of tiny pores, increasing its surface area significantly. This extensive surface area makes activated carbon exceptionally effective at trapping and holding impurities, like a molecular sponge. It is commonly More. This method promotes recycling and reduces agricultural waste, contributing to a circular economy. The high adsorption capacity and rapid adsorption rate make biochar a practical solution for industrial applications.

The study highlights the potential of mandarin peel-derived biochar as an effective and sustainable adsorbent for removing harmful dyes from industrial wastewater. This approach not only addresses pollution but also promotes the efficient use of agricultural waste, paving the way for greener and more sustainable industrial practices.