New solid phase extractor based on ionic liquid functionalized silica gel surface for selective separation and determination of lanthanum

Abstract

Background: Direct determination of metal ions, in particular at ultra-trace concentration, cannot be easily achieved in complex systems by analytical techniques because of the lack of sensitivity and selectivity of these methods. Therefore, an efficient separation step is often required prior to the determination of metal ions for sensitive, accurate, and interference-free determination of metal ions. In accordance, a new solid phase extractor based on silica gel functionalized with ionic liquid (SG-N-PhenacylPyrNTf 2 ) was developed for a selective separation of La(III) prior to its determination by inductively coupled plasma-optical emission spectrometry. Methods: Immobilization of the ionic liquid on activated silica gel surface was confirmed by both Fourier transform infrared spectroscopy and scanning electron microscope. The concentration of ionic liquid on the surface of activated silica gel was determined based on thermal desorption method. The uptake behavior of the new SG-N-PhenacylPyrNTf 2 adsorbent toward metal ions was studied under static conditions by batch mode. The supernatant concentrations of metal ions were directly determined after filtration by inductively coupled plasma-optical emission spectrometry. Results: Fourier transform infrared spectroscopy and scanning electron microscopy results strongly confirmed the formation of SG-N-PhenacylPyrNTf 2 phase. Adsorption isotherm study revealed the preference of SG-N-PhenacylPyrNTf 2 over activated silica gel for a selective separation of La(III) prior to its determination by inductively coupled plasma-optical emission spectrometry. Adsorption isotherm data were well fit the Langmuir adsorption model with a maximum adsorption capacity of 165.39 mg g −1 for La(III), which was consistent with that (167.08 mg g −1 ) experimentally obtained from adsorption isotherm study. Kinetic study demonstrated that the adsorption of La(III) on the SG-N-PhenacylPyrNTf 2 phase followed the pseudo second-order kinetic model. Conclusions:Ultimately, the developed method can be applied and effectively utilized for the determination of La(III) in natural water samples with acceptable and reliable results.

Exploration of silver oxide nanoparticles as a pointer of lanthanum for environmental applications

“…6(a) shows the La(III) adsorption profile on Ag 2 O nanoparticles obtained from the experiment of adsorption isotherm. The adsorption capacity of Ag 2 O nanoparticles for La(III) was experimentally found to be 94.30 mg/g, which is comparable with those previously reported for La(III) in other approaches (2.30 [27], 5.35 [28], 28.65 [29], 120.00 [30], 154.70 [31], 167.08 [32] and 175.40 mg/g [4]). …”

Immobilization of Choline Chloride: Urea onto Mesoporous Silica for Carbon Dioxide Capture

“…Proposed schematic illustration of interaction between SG200 and ChCl:U is shown in Figure 2(a). The interaction is depicted from the mechanism proposed between IL and mesoporous silica (Marwani & Alsafrani 2013).…”

Selective extraction and detection of noble metal based on ionic liquid immobilized silica gel surface using ICP-OES

“…Different instruments were employed in the current study, including Perkin Elmer spectrum 100 series FTIR spectrometer (Beaconsfield, Bucks, UK), field emission-scanning electron microscope (FESEM, QUANT FEG 450, Amsterdam, The Netherlands), Thermolyne 47900 furnace, Jenway model 3505 laboratory pH meter (CamLab, UK) and Perkin Elmer ICP-OES model Optima 4100 DV, USA. Instrumental parameters used in this study were similar to those applied in our previous study [41]…”