Integrated adsorption-membrane filtration process for antibiotic removal from aqueous solution

This study investigated the removal of two widely used antibiotics, norfloxacin (NOR) and ofloxacin (OFL) from aqueous solution by employing a novel integrated adsorption cum membrane filtration process. The application potential of the adsorbent was investigated by evaluating the effect of differen...

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Bibliographic Details
Published in:Powder technology Vol. 321; pp. 259 - 269
Main Authors: Sharma, Vibhu, Vinoth Kumar, R., Pakshirajan, Kannan, Pugazhenthi, G.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 01.11.2017
Elsevier BV
Subjects:
Adsorbates
Adsorbents
Adsorption
Anion exchange
Anion exchanging
Antibiotics
Aqueous solutions
Ceramic membrane
ceramics
Data processing
electrostatic interactions
Electrostatic properties
Filtration
Fluoroquinolone
Fourier transform infrared spectroscopy
Hybrid process
hydrophobic bonding
Hydrophobicity
Kinetics
Membrane filtration
Microfiltration
Modified Ni-Al LDH
Norfloxacin
Ofloxacin
pH effects
powders
Process parameters
sorption isotherms
Steric hindrance
Ceramic membrane
Fluoroquinolone
Adsorption
Hybrid process
Modified Ni-Al LDH
ISSN:0032-5910, 1873-328X
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Summary:This study investigated the removal of two widely used antibiotics, norfloxacin (NOR) and ofloxacin (OFL) from aqueous solution by employing a novel integrated adsorption cum membrane filtration process. The application potential of the adsorbent was investigated by evaluating the effect of different process parameters; including solution pH, initial antibiotic concentration and adsorbent dosage. Among these parameters, solution pH significantly affected the removal of antibiotics due to its strong effect on the charges of the adsorbent and the adsorbate. The removal efficiency decreased with an increase in the initial antibiotics concentration and increased with an increase in the adsorbent amount. A maximum removal of 98.7% for NOR and 94.61% for OFL was achieved with 10mg/L initial concentration and at a solution pH of 7. A high removal of NOR as compared with that of OFL was attributed to a high steric hindrance of OFL due to its bulky structure. The adsorption kinetic data for both the antibiotics followed the pseudo second order kinetics, and the sorption isotherm data was best described by the Langmuir model. Further, adsorption of the two antibiotics involved a combination of electrostatic interaction, anion exchange and hydrophobic interaction mechanisms. The FTIR spectrum of the modified LDH obtained before and after adsorption confirmed the adsorbate-adsorbent interaction. Finally, the microfiltration technique using a ceramic membrane was effectively employed to separate the loaded adsorbent from solution to recover and reuse the adsorbent with an aim to reduce the overall cost of the adsorption process. [Display omitted] •Hybrid adsorption cum membrane microfiltration introduced for antibiotics removal•SDS modified Ni-Al LDH contributed as an adsorbent to wastewater treatment.•Low cost microfiltration membrane applied to reduce the overall operation cost•Modified LDH is better for adsorption of NOR (98.7%) and OFL (94.6%).•Established scheme can be employed efficient removal of fluoroquinolone antibiotics.
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ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2017.08.040