Ghosh, et al (2024) Synthesis of polymeric aerogels with different fillers and their application for the removal of emerging pollutants: a comparative study. 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 Conversion and Biorefinery. https://doi.org/10.1007/s13399-024-05715-x

In a recent study, researchers have innovated the traditional aerogel preparation method by substituting solvent substitution and supercritical drying with cooling the hydrogel at 277 K followed by freeze-drying. This new approach aims to simplify the process and explore the effects of different modification agents or fillers on the aerogels’ physical and chemical properties.

Various parameters such as 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, salinity, moisture content, and temperature were examined to understand their impact on the aerogels. Significant variations in physical properties were noted based on the fillers used within the polyvinyl alcohol (PVA) matrix. Notably, the PVA-rice husk 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 (PVA-RHBC) aerogel exhibited the highest density at 0.26 g/cm³. On the other hand, the PVA-silica (PVA-Si) aerogel demonstrated the highest porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More at 97.05% and a remarkable swelling tendency of 187.24%.

The study also revealed that the aerogels degraded the least at pH 6, establishing this as the optimum pH condition. Additionally, the adsorption properties of the prepared aerogels were tested against six different pollutants, including organic pollutants, metal ions, and dyes. The PVA-Si aerogel emerged as the most effective, showing the highest removal rates across all pollutants tested. Specifically, it achieved an 89.71% removal rate for methylene blue, while the PVA aerogel showed the lowest removal efficiency of 21.39% for Cr (VI). For polycyclic aromatic hydrocarbons (PAHs), the highest removal rate was 70.5% for naphthalene.

This innovative approach to aerogel preparation highlights the potential of freeze-drying and biochar fillers to enhance the properties and pollutant removal capabilities of aerogels, paving the way for more efficient environmental applications.