Tetracycline adsorption on montmorillonite: pH and ionic strength effects

Parolo, María Eugenia; Savini, Mónica C.; Vallés, Jorge M.; Baschini, Miria; Avena, Marcelo Javier

doi:10.1016/j.clay.2007.08.003

Cited by 288 publications

(175 citation statements)

References 33 publications

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“…5d, the peaks at 1523 cm À1 and 1674 cm À1 are attributed to the vibration of NH 2 amide and C@O amide groups of ring A, respectively. The peaks at 1616 cm À1 and 1456 cm À1 can be assigned to the C@O stretching of ring A and the CAC stretching vibration, respectively (Parolo et al, 2010(Parolo et al, , 2008. The appearance of these peaks in the spectrum of TC-loaded adsorbent indicated that TC was adsorbed onto the surface of adsorbent.…”

Section: Adsorption Mechanismmentioning

confidence: 98%

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

et al. 2015

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Section: Adsorption Mechanismmentioning

confidence: 98%

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

et al. 2015

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“…However, this observation may be misleading. Such high pH may cause some degradation of the OTC (Parolo et al 2008), thus lowering the residual concentration of OTC in solution resulting in false high in calculated adsorption value. The measurements were performed at a constant ionic strength of 0.01 M (KCl).…”

Section: Effect Of Ph On Otc Sorption Onto Untreated Montmorillonitementioning

confidence: 99%

“…Parolo et al (2008) described a Patagonian montmorillonite that appeared as a good adsorbent of TC. Choi et al (2008) used two types of granular active carbon for the removal of OTC from synthetic and real wastewaters.…”

Section: Introductionmentioning

confidence: 99%

“…However, the presence and persistence of antibiotics in soil and aquatic environments could encourage the development of new antibiotic-resistant populations of bacteria (Henry 2000). The TC group of antibiotics is characterized by three different moieties of the molecule that can undergo protonation-deprotonation reactions and have the possibility to adopt different ionic species and conformations depending on the pH of the aqueous solution in which TC is dissolved (Parolo et al 2008). Oxytetracycline, or OTC, (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Oxytetracycline sorption onto Iraqi montmorillonite

Barbooti

Punamiya

et al. 2013

Int. J. Environ. Sci. Technol.

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This paper assesses the use of certified Iraqi montmorillonite clay as a potential sorbent for the removal of oxytetracycline (OTC) from aqueous solutions. The clay is characterized by a cation exchange capacity of 0.756 meq g -1 and a zero point charge at pH 8.7. Aqueous solutions of OTC were equilibrated with montmorillonite under various experimental conditions, such as OTC concentration, pH and clay content, for 24 h at fixed ionic strength. Two forms of montmorillonite were evaluated: regular and iron-modified form. The effect of pH was minor on OTC adsorption. Kinetic study revealed that the sorption follows a pseudo-second-order model. Sorption isotherm showed a good fit with the Freundlich model. OTC sorption onto Fe-saturated montmorillonite was analyzed statistically using a response surface design to study the effects of experimental conditions. The introduction of iron improved the adsorption characteristics of the clay due to the ability of ferric ions to make stable complexes with OTC. The most favorable operating conditions for the treatment were deemed as follows: clay content, 6.85 g L -1 , oxytetracycline concentration, 1.0 mmol L -1 and pH, 5.5 for the iron-modified form.

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“…Studies on heavy metals and organic compounds removal from wastewaters using different natural and synthetic materials are many. The important role of FTIR spectroscopy in such studies is either related to the characterization of sorbents, chemical modified sorbents, or to Advanced Aspects of Spectroscopy 56 establish the mechanism involved in sorption processes (Cheng et al, 2012;Chen and Wang, 2012;Xu et al, 2012;Ma et al, 2012a;Wang et al, 2011;Jordan et al, 2011;Bardakçi and Bahçeli, 2010;Pokrovsky et al, 2008;Parolo et al, 2008).Biosorption is considered as an alternative process for the removal of heavy metals, metalloid species, compounds and particles from aqueous solution by biological materials (Mungasavalli et al, 2007). Biomaterials are adsorbent materials with high heavy metals adsorption capacity.…”

mentioning

confidence: 99%

Application of FTIR Spectroscopy in Environmental Studies

Simonescu¹

2012

Advanced Aspects of Spectroscopy

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Figure 1. Schematic representation of the electromagnetic spectrum (adapted from http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/UV-Vis/spectrum)? Advanced Aspects of Spectroscopy 50Infrared radiation is divided into:near (NIR, ν = 10,000 -4,000 cm -1 ); -middle (MIR, ν = 4,000 -200 cm -1 ) and -far (FIR, ν = 200 -10 cm -1 ).Because all compounds show characteristic absorption/emission in the IR spectral region and based on this property they can be analyzed both quantitatively and qualitatively using FT-IR spectroscopy.Today FT-IR instruments are digitalized and are faster and more sensitive than the older ones. FT-IR spectrometers can detect over a hundred volatile organic compounds (VOC) emitted from industrial and biogenic sources. Gas concentrations in stratosphere and troposphere were determined using FT-IR spectrometers (Puckrin et al., 1996).In case of environmental studies FTIR Spectroscopy is used to analyze relevant amount of compositional and structural information concerning environmental samples (Grube et al., 2008). The analysis can be performed also to determine the nature of pollutants, but also to determine the bonding mechanism in case of pollutants removal by sorption processes. Techniques for measuring gas pollutants such as continuous air pollutants analyzer (SO2, NO2, O3, NH3), on-line gas chromatography (GC) used simple real-time instruments to quantify gas pollutants. They need to use several sensors in order to analyze multiple gas pollutants simultaneously.FT-IR spectroscopy coupled with other spectroscopic techniques such as AAS (atomic absorption spectroscopy) have been used to assess the impact of industrial and natural activities on air quality (Kumar et al., 2005;Childers et al., 2001).In addition to the traditional transmission FTIR (T-FTIR) methods (e.g. KBr-pellet or mull techniques), modern reflectance techniques are widely used today in environmental, agricultural, pharmaceuticals, and food studies. These modern techniques are attenuated total reflection FTIR (ATR-FTIR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The choice of the method to be used depends on many factors such as: the information needed (bulk versus surface analysis), the physical form of the sample, the time required for sample preparation (Majedová et al., 2003).In the following there will be presented some of the most important research studies related to the involvement of FTIR spectroscopy in environmental studies. Traditional transmission FT-IR (T-FTIR) spectroscopy in environmental studiesTransmission spectroscopy is the oldest and most commonly used method for identifying either organic or inorganic chemicals providing specific information on molecular structure, chemical bonding and molecular environment. It can be applied to study solids, liquids or gaseous samples being a powerful tool for qualitative and quantitative studies. Application of FTIR Spectroscopy in Environmental Studies 51FTIR instrument's principle of function is the following: IR radi...

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Tetracycline adsorption on montmorillonite: pH and ionic strength effects

Cited by 288 publications

References 33 publications

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

Oxytetracycline sorption onto Iraqi montmorillonite

Application of FTIR Spectroscopy in Environmental Studies

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