title: Preparation of activated carbons from Iris tectorum employing ferric nitrate as dopant for removal of tetracycline from aqueous solutions.
abstract: Ferric nitrate was employed to modify activated carbon prepared from Iris tectorum during H₃PO₄ activation and ability of prepared activated carbon for removal of tetracycline (TC) was investigated. The properties of the activated carbon samples with or without ferric nitrate, ITAC-Fe and ITAC, were measured by scanning electron microscopy (SEM), N₂ adsorption/desorption isotherms, Fourier transform infrared spectroscopy (FTIR) and Boehm's titration. The results showed that mixing with iron increased the BET surface area, total pore volume and the adsorption capacity as compared to the original carbon. FTIR and Boehm's titration suggested that ITAC-Fe was characteristic of more acidic functional groups than ITAC. Adsorption of TC on both samples exhibited a strong pH-dependent behavior and adsorption capacity reduced rapidly with the increasing solution pH. The adsorption kinetics agreed well with the pseudo-second-order model and the adsorption isotherms data were well described by Langmuir model with the maximum adsorption capacity of 625.022 mg/g for ITAC and 769.231 mg/g for ITAC-Fe. The present work suggested that ITAC-Fe could be used to remove tetracycline effectively from aqueous solutions.
authors.affiliation: Shandong provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Zhang
authors.forename: Man
authors.initials: M
authors.lastname: Wang
authors.forename: Ji
authors.initials: J
authors.lastname: Huang
authors.forename: Lihui
authors.initials: L
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry*; D004350:Drug Residues / Q000302:isolation & purification; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D031323:Iris Plant; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D009566:Nitrates / Q000737:chemistry*; D009994:Osmolar Concentration; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013752:Tetracycline / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D005290:Ferric Compounds; D009566:Nitrates; D012996:Solutions; D014867:Water; D002606:Charcoal; D013752:Tetracycline; C025302:ferric nitrate
keywords: Adsorption; Ferric nitrate; Iris tectorum; Tetracycline