Sol–gel-derived thiocyanato-functionalized silica gel sorbents for adsorption of Fe(III) ions from aqueous solution: kinetics, isotherms and thermodynamics

Sui, Dianpeng; Chen, Huaxia; Li, Dawu

doi:10.1007/s10971-016-4092-2

Cited by 15 publications

(9 citation statements)

References 43 publications

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“…A strong absorption at 3447 cm −1 was assigned to the O-H stretching vibration and a peak at 1632 cm −1 assigned to the O-H bending vibrations of surface silanol groups and adsorbed water molecules. A broadband at 1087-1245 cm −1 was attributed to the antisymmetric stretching vibration of Si-O-Si groups, with bands at 964, 803 and 472 cm −1 assigned to the stretching and bending vibrations of Si-O groups (Sui et al 2016;Mota et al 2017).…”

Section: Characterization Of the Physical Properties Of Sg And Ac@sgmentioning

confidence: 99%

Removal of siloxanes from biogas using acetylated silica gel as adsorbent

et al. 2019

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Biogas can be used as an alternative energy source for producing heat and electricity; however, volatile methylsiloxanes (VOSiC) present in biogas can severely damage heat exchangers, turbines and gas engines. Consequently, efficient removal of VOSiC from biogas that is used as a biofuel is required. In this work, acetylated silica gel (Ac@SG) was synthesized, via treatment of microporous silica gel (SG) with acetic anhydride as an adsorbent, for removal of VOSiC from biogas, and characterized with XRD, SEM-EDS, N 2-BET and FT-IR. This Ac@SG adsorbent exhibited a meso-/microporous structure and hydrophobic surface, indicating it was a more efficient adsorbent for removing hexamethyldisiloxane (L2) and octamethylcyclotetrasiloxane (D4) from biogas samples than conventional SG. It was found that the adsorption capacities of Ac@SG reached 304 mg L2/g for hexamethyldisiloxane and 916 mg D4/g for octamethylcyclotetrasiloxane at lower temperatures in the experimental range, and water had no significant effect on its absorption efficiency. The used Ac@SG could be easily regenerated by heating it at 110 °C, and the adsorption capacity of recycled Ac@SG for hexamethyldisiloxane and octamethylcyclotetrasiloxane was kept constant in four recycle adsorption experiments.

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Section: Characterization Of the Physical Properties Of Sg And Ac@sgmentioning

confidence: 99%

Removal of siloxanes from biogas using acetylated silica gel as adsorbent

et al. 2019

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“…Thiocyanate functional group has long been known to form complexes with d block metals [21]. To exploit the affinity of thiocyanatopropyl functional group towards metals, Sui et al described a procedure to synthesize thiocyanatopropyl functionalized silica particles [22]. However, the process was cumbersome, time consuming and of low yield.…”

Section: Introductionmentioning

confidence: 99%

Automated Solid Phase Extraction of Cd(II), Co(II), Cu(II) and Pb(II) Coupled with Flame Atomic Absorption Spectrometry Utilizing a New Sol-Gel Functionalized Silica Sorbent

et al. 2021

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In this study a simple and sensitive on-line sorbent extraction platform coupled with flame atomic absorption spectrometry for trace metals determination was developed. The system utilized for the first time a novel sol-gel thiocyanatopropyl functionalized silica as adsorbent for metal’s separation and preconcentration. The main factors affecting the performance of the on-line system were investigated and optimized. The effect of potential interfering species that occur naturally in environmental and biological samples, as well as some toxic elements, was evaluated. Under optimum conditions the enhancement factors ranged between 73 and 152 for the target analytes. The LODs of the proposed methods were 0.15 μg L−1 for Cd(II), 0.5 μg L−1 for Co(II), 0.5 μg L−1 for Cu(II) and 1.9 μg L−1 for Pb(II) for 120 s preconcentration time. The relative standard deviation values for all elements were less than 3.8%, indicating good method precision. Moreover, the sol-gel thiocyanatopropyl functionalized silica-packed microcolumns exhibited limited flow resistance and excellent packing reproducibility. Finally, the proposed method was utilized for the analysis of environmental and biological samples.

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“…The thiocyanate functional group has long been known for its strong affinity toward metals, and several researchers have reported its use in metal extraction [ 24 , 25 , 26 ] as well as in creating ion-imprinted polymers for a specific metal ion [ 27 , 28 ]. Although, some of these studies utilized the sol-gel process to implant a thiocyanate functional group on silica substrate, the processes are complex and time consuming and involve multi-steps.…”

Section: Introductionmentioning

confidence: 99%

Multi-Element Analysis Based on an Automated On-Line Microcolumn Separation/Preconcentration System Using a Novel Sol-Gel Thiocyanatopropyl-Functionalized Silica Sorbent Prior to ICP-AES for Environmental Water Samples

et al. 2021

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A sol-gel thiocyanatopropyl-functionalized silica sorbent was synthesized and employed for an automated on-line microcolumn preconcentration platform as a front-end to inductively coupled plasma atomic emission spectroscopy (ICP-AES) for the simultaneous determination of Cd(II), Pb(II), Cu(II), Cr(III), Co(II), Ni(II), Zn(II), Mn(II), Hg(II), and V(II). The developed system is based on an easy-to-repack microcolumn construction integrated into a flow injection manifold coupled directly to ICP-AES’s nebulizer. After on-line extraction/preconcentration of the target analyte onto the surface of the sorbent, successive elution with 1.0 mol L−1 HNO3 was performed. All main chemical and hydrodynamic factors affecting the effectiveness of the system were thoroughly investigated and optimized. Under optimized experimental conditions, for 60 s preconcentration time, the enhancement factor achieved for the target analytes was between 31 to 53. The limits of detection varied in the range of 0.05 to 0.24 μg L−1, while the limits of quantification ranged from 0.17 to 0.79 μg L−1. The precision of the method was expressed in terms of relative standard deviation (RSD%) and was less than 7.9%. Furthermore, good method accuracy was observed by analyzing three certified reference materials. The proposed method was also successfully employed for the analysis of environmental water samples.

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Sol–gel-derived thiocyanato-functionalized silica gel sorbents for adsorption of Fe(III) ions from aqueous solution: kinetics, isotherms and thermodynamics

Cited by 15 publications

References 43 publications

Removal of siloxanes from biogas using acetylated silica gel as adsorbent

Removal of siloxanes from biogas using acetylated silica gel as adsorbent

Automated Solid Phase Extraction of Cd(II), Co(II), Cu(II) and Pb(II) Coupled with Flame Atomic Absorption Spectrometry Utilizing a New Sol-Gel Functionalized Silica Sorbent

Multi-Element Analysis Based on an Automated On-Line Microcolumn Separation/Preconcentration System Using a Novel Sol-Gel Thiocyanatopropyl-Functionalized Silica Sorbent Prior to ICP-AES for Environmental Water Samples

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