Nanocomposites of zero-valent Iron@Activated carbon derived from corn stalk for adsorptive removal of tetracycline antibiotics. (September 2020)

• Record Type: Journal Article
• Authors: Song, Yue-Xian; Chen, Su; You, Nan; Fan, Hong-Tao; Sun, Li-Na
• Is Part Of: Chemosphere. Volume 255(2020)
• Publication Date: 2020-09
• Subjects: Nanocomposites -- Zero-valent iron -- Activated carbon -- Tetracycline antibiotics -- Adsorptive removal; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126917
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The hybrid nanocomposites of zero-valent iron loaded the activated carbon derived from the corn stalk (ZVI@ACCS) was prepared and used to remove the antibiotics of tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) from aqueous solution. The adsorption amounts of three antibiotics (103.1 mg g −1 for CTC, 72.9 mg g −1 for OTC and 81.5 mg g −1 for TC) were sensitive to the temperature and independent of pH in the range of 4.2–7.1 at 298 K through the synergistic interactions of the electrostatic attraction, the bridging complexation and the surface complexation. The equilibrium was performed within 20 min at 298 K. The spontaneous (Δ G o <0) and endothermic (Δ H o >0) adsorption of three antibiotics onto the ZVI@ACCS nanocomposites gave a better matching ( r 2 > 0.99) with Langmuir and pseudo-second-order models. Highlights: Nanocomposites of zero valent iron@activated carbon from corn stalk was prepared. Nanocomposites with advantages of high capacity, fast uptake rate and wide pH range. Antibiotics adsorption fitted well with Langmuir and pseudo-second-order equations. Spontaneous and endothermic process of antibiotics adsorption was found.