Removal of Tetracycline From Aqueous Solutions Using Nanoscale Zero Valent Iron and Functional Pumice Modified Nanoscale Zero Valent Iron

Abstract

Nanoscale zero valent iron (nzvi) and functional pumice modified nanoscale zero valent iron (P-nzvi) were successfully synthesized and used for the removal of tetracycline (TC). These materials were characterized by SEM, TEM, XRD, FTIR, BET. Different factors such as the mass ratio, dosage of adsorbent, ph, initial TC concentration and temperature were investigated. Based on these results; a possible removal mechanism was proposed including TC adsorption and TC reduction via oxidation of Fe0 to Fe3+. In addition, isotherm and thermodynamic parameters were applied to the equilibrium data. The maximum adsorption capacity of TC by nzvi and P-nzvi was 105.46 mg/g and 115.13 mg/g, respectively. Adsorption and reduction kinetics were examined for the TC removal process. The pseudo-second-order model and pseudo-first-order model was observed for adsorption and reduction process, respectively. Finally, more than 90% of TC from aqueous solutions was removed by nzvi and P-nzvi.

Comparison of Paraquat Herbicide Removal from Aqueous Solutions using Nanoscale Zero-Valent Iron-Pumice/Diatomite Composites

“…e presented results are consistent with the results of the Gluer study to remove tetracycline by zero-valent iron nanoparticles with pumice [26]. Also, a similar study carried out by Harman and Genisoglu in 2016 on copper removal by P-nZVI yielded similar results [41].…”

“…ereafter, NaBH 4 was added dropwise to the solution under a hood with constant stirring. After the color change of the solution, the solids were separated from the solution by vacuum filtration, washed with ethanol, and dried in an oven at 50 °C [26].…”

“…e solutions were shaken in a temperature-controlled shaker (OS-300). Sampling was made at a certain time interval (10-100 min) and then, the samples were filtered with a syringe filter (0.02 μm pore size, Whatman Anotop 10), and stored at 4 °C when needed, and analyzed within 48 h of collection [26]. All experiments were performed in triplicates.…”

Reductive Dechlorination of Chloroacetamides with NaBH4 Catalyzed by Zero Valent Iron, ZVI, Nanoparticles in ORMOSIL Matrices Prepared via the Sol-Gel Route

“…ZVI has been widely studied as a reducing agent for the remediation treatment of halogenated hydrocarbon pollutants in the environment, both for contaminated soils and for water sources [17,18]. Other applications involve the adsorption of toxic heavy metal cation such as lead and arsenic [19][20][21] and of organic pollutants such as tetracycline [22], which might reduce the risk of increasing antibiotics resistance. It is also used in Fenton-based oxidations, for example, to remove amoxicillin [23] and to remove TNT from water sources [20].…”

Effective Degradation of Rh 6G Using Montmorillonite-Supported Nano Zero-Valent Iron under Microwave Treatment

“…In recent years, nZVI has attracted much attention due to the high specific surface area, large surface energy, and excellent performance for treating contaminants [19]. The nZVI had good results in the treatment of printing and dyeing wastewater [20], heavy metals [21,22], chlorinated organic compounds [23,24], organic insecticides [25,26], and other areas [27,28]. However, nZVI is highly reactive and easily oxidized [29], limiting its practical applications.…”