Elham Aseman-Bashiz; Hossein Sayyaf
Abstract
This study was conducted with the aim of introducing a new sono-Fenton system containing nano-pyrite catalyst and hydrogen peroxide (HP) for the effective removal of tetracycline (TC) from aqueous solutions. The synthesized nano-pyrite was characterized through XRD, FTIR, FE-SEM, and EDX analyses. The ...
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This study was conducted with the aim of introducing a new sono-Fenton system containing nano-pyrite catalyst and hydrogen peroxide (HP) for the effective removal of tetracycline (TC) from aqueous solutions. The synthesized nano-pyrite was characterized through XRD, FTIR, FE-SEM, and EDX analyses. The best performance of the sono-Fenton nano-pyrite/HP system was observed under the condition of pH 3.0, TC 8.0 mg/L, HP 4.0 mM, ultrasound (US) 40 W, nano-pyrite 1.0 g/L, and 20 min with 93.1% removal efficiency. Comparison of the efficiency of the proposed system components confirmed the remarkable synergy between sono-catalysis and Fenton reactions due to the simultaneous application of nano-pyrite, HP, and US power. Meanwhile, US irradiation caused fluidization, turbulence, mass transfer, and nano-pyrite surface cleaning due to its cavitation and oscillation effects. According to the tracer test, the main agent of TC degradation in the sono-Fenton process was HO^•. The results showed that the TC removal efficiency from the first to the fourth run reached from 93.1% to 70.3%. This means that the recyclability of nano-pyrite has been very successful. Overall, the proposed sono-Fenton system was an efficient and sustainable process for the rapid and effective removal of pharmaceutical contaminants from water and wastewater.
Alireza Behzadi; Amirhosein Yazdanbakhsh
Abstract
Recently, there has been growing concern about the presence of pharmaceutical compounds and particularly antibiotics as emerging contaminants. This study employed high specific surface area organic aerogels to remove Tetracycline antibiotics. For this purpose, resorcinol formaldehyde aerogel (RF) was ...
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Recently, there has been growing concern about the presence of pharmaceutical compounds and particularly antibiotics as emerging contaminants. This study employed high specific surface area organic aerogels to remove Tetracycline antibiotics. For this purpose, resorcinol formaldehyde aerogel (RF) was synthesized via the sol-gel process and dried under ambient drying conditions. The synthesized RF aerogel was modified by incorporating 1 wt.% graphene with 1 wt.% m-phenylenediamine during the synthesis process to prepare RF-G1/PmPDA1. Eventually, the performance of the synthesized samples as adsorbents was evaluated under various parameters such as the effects of pH values (2-12), adsorbent dose (4-10 mg), and adsorbent with antibiotics contact time (3-24 h). FTIR, FESEM, BET, CHN, and EDS tests were conducted to characterize the samples. Afterward, the adsorption rate of Tetracycline antibiotics was measured using UV-Vis. The BET test results revealed that the modification of the RF aerogel sample also increased the specific surface area from 96 to 308 m2/g. The results also discovered that the removal rate of Tetracycline antibiotics for the RF aerogel and RF-G1/PmPDA1 was obtained to be 65.2% and 93.3% at optimal pH of 4 and 4, respectively.