Health and environment
Akram Eskandariyan; Sahar Sadat Azad; Abolfazl Rahmani Sani; Ayoob Rastegar; Ahmad Alahabadi
Volume 24, Issue 3 , July and August 2017, , Pages 183-189
Abstract
Background& Objectives: Antibiotics are a group of synthetic organic materials that are not removable by biological treatment process and need to be treated by advanced process like surface absorption. Since activated carbon is one of the best choices for using as adsorbent, this project was aimed ...
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Background& Objectives: Antibiotics are a group of synthetic organic materials that are not removable by biological treatment process and need to be treated by advanced process like surface absorption. Since activated carbon is one of the best choices for using as adsorbent, this project was aimed on the removal of amoxicillin antibiotic from aquatics solutions by a novel modified activated carbon.
Materials & Method: The present study was an experimental study which was conducted by using batch wise method. Erlenmeyers with 100 mL volume containing 50 mL of amoxicillin with a known concentration and amount of adsorbent were shacked at different pHs, contact times and temperatures. The samples were filtered by vacuumed pump using 0.04 acetate cellulous filter and the residual of amoxicillin was determined by UV spectrophotometer at 228 nm using quarts cell.
Results: The results obtained from experimental data was shown that the best efficiency of amoxicillin removal from aquatic solution by the new activated carbon takes places at pH= 6, adsorbent dose of 0.06 g/L and 20 min contact time. In this project the used activated carbon efficiency was 75.5%, in antibiotic concentration of 50 mg/L. Isotherm studies were shown that the amoxicillin absorption can be explained by both Langmuir and Freundlich models, and the degree of reaction obtained from kinetic studies was of second order.
.Conclusion: With regard to acceptable worth capacity of the new activated carbon, it was suitable to replace standard Merck carbon for water and wastewater treatment.
Kamyar Yaghmaiyan; Gholamreza Mousavi; Hamidreza Karimi; Ahmad Allahabadi
Volume 20, Issue 4 , January and February 2014, , Pages 573-582
Abstract
Background: Antibiotics are important pollutants of water resources, and because of hard biodegradability, they can be filtered through adsorption method. Activated carbon is one of the best adsorbents. The aim of this study was to investigate the amoxicillin removal rate of a standard granular activated ...
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Background: Antibiotics are important pollutants of water resources, and because of hard biodegradability, they can be filtered through adsorption method. Activated carbon is one of the best adsorbents. The aim of this study was to investigate the amoxicillin removal rate of a standard granular activated carbon.
Materials and methods: The adsorption experiments were conducted in the stirred (100 rpm) glass reactor. In each test, 50 ml of aqueous solution contaminated by amoxicillin was transferred into the reactor, and the influence of adsorbent dose, adsorbent type, amoxicillin concentration, reaction time, solution pH and temperature was tested on the amoxicillin adsorption. At the end of each of adsorption tests, the suspension was filtered using a cellulose acetate filter with 0.45µm pore size and the filtrate was analyzed for residual amoxicillin using HPLC.
Results: The obtained data showed that the best conditions for removal of amoxicillin from contaminated water using granular activated carbon were as follow: pH: 6, adsorbent concentration: 1.6 g/l, reaction time: 60 min, temperature: 25oc. In these conditions up to 86% of amoxicillin (concentration: 50 mg/l) could be adsorb by a granular 16-20 activated carbon.
Conclusion: Adsorption onto activated carbon is an efficient method for the removal of non-degradable water pollutants such as antibiotics and toxins.