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High-efficient biosorbent of Pb2+ derived from the organic frameworks of Cladophora rupestris
Summary
Researchers developed an adsorbent material from the green alga Cladophora rupestris to remove lead from water. The organic framework derived from the alga showed high lead-binding capacity across a range of conditions. Algae-based biosorbents offer a low-cost, renewable alternative to conventional materials for removing toxic heavy metals from contaminated water.
Abstract This study aims to investigate the Pb2+ adsorption performance of the organic frameworks derived from Cladophora rupestris (CROF). The characterizations of CROF and Pb2+ adsorption process was analysed using SEM-EDS, LPSA, BET, PHPZC, FTIR and XPS. The results was showed that CROF was porous structure, had both macroporous and microporous properties. The particle size is normally distributed with a median diameter of 36.8 µm. PHPZC of CROF was 7.02. The CROF adsorption isotherms and kinetics closely matched Langmuir model and Pseudo-second-order(PSO), respectively, the adsorption behaviors can be classified as monolayer chemical adsorption. The maximum adsorption capacity (Qm) was 15.02 mg/g and 97% of the Pb2+ was adsorbed onto the CROF within 20 min. And the adsorption was exothermic, spontaneous and minimised randomness. Additionally, the biosorbent has outstanding Pb2+adsorption capability due to pore filling, ion exchange, Pb-πinteraction, and surface complexation between nitrogen and oxygen functional groups(OFGs and NFGs). CROF is economical and environmentally friendly and it can be used as an adsorbent to take Pb2+ out from waterbodies.
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