期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 415, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125701
关键词
Magnetic nanoparticles; Green tea waste activated carbon; Magnetic carbon nanocomposite; Polycyclic aromatic hydrocarbons; Adsorption mechanism
This study successfully synthesized a magnetic activated carbon nanocomposite (MNPsGTAC) from green tea leaf waste and evaluated its adsorption efficiency for 4 priority polycyclic aromatic hydrocarbons (PAHs). The MNPsGTAC showed rapid kinetics, high removal rates, and good recyclability, with successful applications in various water environments for efficient PAH removal.
This study aims to synthesize a magnetic activated carbon nanocomposite from green tea leaf waste (MNPsGTAC) for evaluation of adsorption efficiency of 4 priority polycyclic aromatic hydrocarbons (PAHs). MNPsGTAC contained spherically-shaped MNPs with cubic spinel structure, surface area at 118.8 m2/g, particle size at 8.6 nm and saturation magnetization at 34.2 emu/g. PAH adsorption reached a plateau at an MNPs-GTAC dose of 50 or 60 mg/L, pH of 2-4 and ionic strength of 0.1-10%, with PAH reduction in the presence of humic acid being compensated by addition of 0.1% sodium chloride. Kinetics was rapid attaining 80% removal within 5 min and the pseudo-second-order rate decreased in this order: Benzo[a]anthracene>Chrysene>Benzo[b]fluoranthene>Benzo[a]pyrene. Isotherm modeling revealed a Langmuir type-2 shape with the maximum adsorption capacity being 28.08, 22.75, 19.14 and 15.86 mg/g for Benzo[b]fluoranthene, Benzo[a]pyrene, Chrysene and Benzo[a]anthracene, respectively. Temperature study showed the PAH adsorption to be an endothermic and spontaneous process with increased randomness at solid-solution interface. Acetonitrile could completely recover the adsorbed PAH and MNPs-GTAC was successfully recycled 5 times with a minimum loss. Application to mineral water showed 86-98% and 72-89% removal for PAHs spiked respectively at 0.1 and 1 mg/L, while a complete removal was attained in tap and river waters.
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