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Bisphenol A (BPA) removal from municipal landfill leachate (MLL) matrices is impeded due to negative matrix interference effects and limited binding sites in existing sequestering agents. To address this conundrum, a novel surface-active/π-electron-rich designer lipopeptide bioamphiphile (DLB) was biomanufactured with abundant BPA-specific and anti-interference regulating functional sites for targeted removal of BPA from MLL. To achieve this, the aromatic π-electron-rich amino acids and surface-active fatty acids were screened from waste-activated sludge and poultry industry wastes, respectively, using thermal-alkali pre-treatment and were concurrently bio-upcycled in the domains of DLB via a de-novo substrate-dependent synthesis pathway employing Bacillus tropicus MK613141. The resulting DLB-anchored functionalized nanoporous activated bio-carbon (DLB-FNABC) exhibited high BPA sequestration affinity (KL = 3.7 × 106 M–1; Qm = 179 mg g–1) due to the synergistic binding sites in DLB. The cross-talk interaction study between DLB molecular chemistry and MLL matrix chemistry unveiled the intricate interplay of hydrogen bonding, π–π, cation−π, and hydrophobic interactions in enhanced BPA sequestration by DLB-FNABC. The solvent shielding experiment divulges the higher contribution of hydrophobic interaction (95.9 mg g–1 DLB-FNABC) to BPA sequestration compared to the ∑hydrophilic interactions (83.1 mg g–1 DLB-FNABC). Subsequently, DLB-FNABC when applied to real-time MLL matrix removed the majority of environmentally relevant BPA (>99% sequestration) at an applied dose of 30 mg L–1 only. Thus, these findings highlight the potential for upcycling environmental waste to synthesize designer sequestering agents that can enhance BPA removal from MLL and safeguard groundwater resources.
Uddin et al. (Thu,) studied this question.
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