Alireza Behzadi; Amirhosein Yazdanbakhsh
Abstract
Background and Purpose: In recent years, concerns about the presence of pharmaceutical compounds in the wastewater have been increasing. Various types of residues of the widely used tetracycline family of antibiotic compounds are found in environmental waters in relatively low and persistent concentrations ...
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Background and Purpose: In recent years, concerns about the presence of pharmaceutical compounds in the wastewater have been increasing. Various types of residues of the widely used tetracycline family of antibiotic compounds are found in environmental waters in relatively low and persistent concentrations that have adverse effects on human health and the environment. The aim of this study was to synthesize high specific level organic aerogels to remove Minocycline antibiotics.Material and Methods: In this study, resorcinol formaldehyde aerogel was synthesized using sol-gel process and dried by ambient drying. The aerogel was then modified using graphene and finally the performance of the synthesized samples as adsorbent under various parameters such as solution pH (2 -12), the amount of adsorbent (4-10 mg) and the time of contact of the adsorbent with the antibiotic (3-24 h) were evaluated. Raman spectroscopy, electron microscopy (FE-SEM) and BET tests were used to characterize the samples and then the removal efficiency of Minocycline antibiotic was measured by the samples using UV-Vis analysis.Results: The results of BET test showed that the specific surface area of the resorcinol formaldehyde aerogel sample containing 1wt.% graphene was increased compared to the neat aerogel. Also, according to the results, it was found that the removal percentage of minocycline antibiotic for pure and modified samples is 71.6% and 92.1% at optimal pH of 4 and 6, respectively.Conclusion: Graphene-modified resorcinol formaldehyde aerogel is a suitable adsorbent for removal of Minocycline antibiotic from aqueous solution.
Mohsen Yazdani; Ali Asghar Najafpoor; Ali Akbar Dehghan; Hossein Alidadi; mahmood dankoob; Reyhane Zangi; Sima Nourbakhsh; Reza Ataei; Ali Asghar Navaei fezabady
Abstract
Background and objectives: Tetracycline is known as the second high consumed groups of antibiotics throughout the world, which their entrance into the domestic wastewater will lead to pollute the water resources. The aim of this study was to determine the performance of combined Ultrasonic/UVprocess ...
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Background and objectives: Tetracycline is known as the second high consumed groups of antibiotics throughout the world, which their entrance into the domestic wastewater will lead to pollute the water resources. The aim of this study was to determine the performance of combined Ultrasonic/UVprocess in removal of tetracycline antibiotic from aqueous environments. Material and methods: This experimental study was performed by the ultrasonic bath associated with ultraviolet radiation. To determine the effects of independent variables including contact time (5-60 min), initial antibiotic concentration (5-25 mg/l), pH (3-10) and the input power (100- 300 W) on response variable (tetracycline removal), the samples were taken from reactor in different time intervals and the residual concentrations of tetracycline were measured by spectrophotometer in 261 nm wavelength. Results: The results of this study showed that the removal efficiency of UV and Ultrasonic processes was16% and 32% in optimum conditions, respectively. While in Ultrasonic /UV process, removal efficiency increased. The best removal efficiency (72%) was observed in pHof 4.5, antibiotic concentrationof10 mg/I, input power of240 W and contact timeof50 min. Conclusion: According to the obtained results, Ultrasonic/UVprocess can be used as an effective process to remove the tetracycline antibiotic from aqueous solutions.