Impregnation of Silver Nanoparticles onto Polymers Based on Sugarcane Bagasse for the Remediation of Endocrine Disruptor–Bisphenol A from Water

Abstract

This present study introduces a contemporary innovation of synthesized polymer–silver nanoparticle nanocomposite adsorbent based on sugarcane bagasse (AgNP-SB-βCD) for the sequestration of emerging micropollutant–bisphenol A from water matrix. Batch adsorption mode was carried out to assess the effectiveness of AgNP-SB-βCD nanocomposites towards eliminating bisphenol A (BPA). Characterization techniques including SEM, FTIR, and XRD have confirmed the successful incorporation of silver nanoparticles (AgNPs) onto bagasse–polymer. At 25°C, pH 7, and contact time of 120 min, the nanocomposites had a maximum uptake capacity of 158.4 mg g-1on BPA. The equilibrium isotherm of BPA on AgNPs-SB-βCD has fitted effectively with Langmuir model while the adsorption kinetics conformed to pseudo-second order. The adsorption phenomenon was controlled mainly by physisorption (via host–guest inclusion van der Waals bonding and pore filling effect). In addition, oxidative degradation of BPA by AgNPs-SB-βCD could marginally contribute the removal of BPA due to oxidative dissolution of AgNPs at pH 7. The thermodynamic results substantiate the spontaneity and exothermic behaviors of the adsorption phenomenon. The polymeric nanocomposite adsorbent was regenerated five times (using 75% ethanol) without considerable loss of its adsorption capacity. This authenticates its reusability and consistency performances; accordingly, it can be a market competitor adsorbent for the treatment of water contaminated with BPA.

A Sustainable, Green-Processed, Ag-Nanoparticle-Incorporated Eggshell-Derived Biomaterial for Wound-Healing Applications

“…The ESM samples, extracted with AA and manually peeled, were cut into circular discs using an AcuPunch ® (14 mm). The samples were submerged in 10 mL of 5 µg/mL of commercial AgNPs (~10 nm), used as a positive control, and green-synthesized AgNPs (~10 nm) in 6-well tissue culture plates (TCP), covered with foil and continuously stirred (50 rpm) at 37 °C for 24 h (for impregnation of AgNPs from solution to the network of ESM) [ 26 ], as observed in Figure 2 . The modified samples: AA-extracted ESM incorporated with commercial AgNPs (AC) or green-synthesized AgNPs (AM) and manually peeled ESM incorporated with commercial AgNPs (SC) or green-synthesized AgNPs (SM) were air dried for 3 to 5 h before being stored at 4 °C.…”

Impregnation of Modified Magnetic Nanoparticles on Low-Cost Agro-Waste-Derived Biochar for Enhanced Removal of Pharmaceutically Active Compounds: Performance Evaluation and Optimization Using Response Surface Methodology

“…Green adsorbents are prepared mainly from agro-wastes, natural resources, aquatic biomass, etc., and have demonstrated significant removal efficiencies for varied contaminants [18,19]. However, biomass-based adsorbents have certain limitations, such as poor adsorptivity, low regeneration capacity, low stability, high sensitivity to pH and temperature changes, etc., which lowers their overall performance [20]. The conversion of biomass to high-value-added products, such as biochar, could address these shortcomings.…”