Mesoporous silica containing Si(CH2)3NHC(S)NHC2H5 functional groups in the surface layer

Nazarchuk, Galyna I.; Melnyk, Inna V.; Zub, Yuriy L.; Makridina, Olga I.; Vezentsev, A. I.

doi:10.1016/j.jcis.2012.08.057

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Synthesis of trifunctional silane (C 2 H 5 O) 3 Si(CH 2 ) 3 NHC(S)NHC 2 H (ETUS) was carried out according to reference [29]. Thus, the solution of 4.4 mL (0.05 mol) of ethylisothiocyanate in 20 mL of C 2 H 5 OH was added under vigorous stirring to 11.7 mL (0.05 mol) of APTES dissolved in mL of C 2 H 5 OH (99.5%) in a Schlenk flask (nitrogen atmosphere).…”

Section: Synthetic Approachesmentioning

confidence: 99%

Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Melnyk

Václavíková

Ivaničová

et al. 2023

Applied Surface Science

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Section: Synthetic Approachesmentioning

confidence: 99%

Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Melnyk

Václavíková

Ivaničová

et al. 2023

Applied Surface Science

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“…Green technologies derived via microbial metabolism have effectively been used in the treatment of heavy metals and wastewater [30][31][32]. Sulfur-based sorbents (thions, thiols or heterocyclic compounds) show a high affinity toward silver ions [22,23,[33][34][35]; due to the sulfur reagent compounds, which shows a high selectivity for silver [36][37][38][39][40][41], this is based on hard and soft acids and bases (HSAB) theory [42]. Selectivity has been shown by sulfur-containing polymers, i.e., dithiocarbamate [43], mercaptobenzimidazole [35] and thiol derivatives [44,45].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sulfur-Grafted Chitosan Biopolymers and Improvement to Their Sorption of Silver Ions from Different Aqueous Solutions

Hamza,

El-Habibi,

Abdel-Rahman

et al. 2024

Sustainability

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A functionalized chitosan thiourea composite (CH-TU) was successfully synthesized using formaldehyde as a crosslinking agent for enhancing silver recovery from different aqueous solutions. Comparison sorption studies with a non-functionalized composite (CH-F) as a reference material were conducted. Grafting led to an improvement in the sorption performances, i.e., 0.763 mmol Ag g−1 for CH-F vs. 2.125 mmol Ag g−1 for CH-TU. The pseudo-first-order rate equation (PFORE) was fitted to the sorption kinetics at saturation times of 40 and 30 min for CH-F and CH-TU, respectively, while the sorption isotherms were fitted with Langmuir and Sips equations for both sorbents. Fourier transform infrared (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), nitrogen sorption–desorption isotherms (BET-surface area), elemental analysis, thermogravimetric analysis (TGA) and pH of the zero charge (pHpzc) were used to characterize and investigate the sorption mechanism. Sorption was performed three times to check the reproducibility, while the sorption performances were stable over 20 cycles, with a limited decrease in performance (5 and 3% for CH-F and CH-TU, respectively). Nitric acid solution (0.3 M) was efficient for desorbing the adsorbed metal ions. The grafted sorbent with thiourea is considered as a promising tool for recovering Ag(I) from acidic waste leachate derived from waste spent films.

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“…Porous materials with thiourea groups in the surface layer are proved to be perspective for the sorption of heavy metal ions from aqueous solutions. Earlier, the scientists from our research team developed a one-step technique for the synthesis of the xerogels [12], the bridged xerogels [12,13], mesoporous MCM-41 [12,14], and SBA-15 [15,16] type materials with thiourea functional groups and showed their ability to remove mercury(II) and silver(I) ions from aqueous solutions [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

Modification of Ceramic Membranes by Silica Nanoparticles with Thiourea Functions

Tomina

Nazarchuk

Melnyk

2019

Journal of Nanomaterials

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Sol-gel approach based on hydrolytic copolycondensation of tetraethoxysilane (TEOS) with ethylthiocarbamidepropyl triethoxysilane (ETUS) was used to deposit functional layers with thiourea functions on the surface of macroporous ceramic alumina membrane supports. According to SEM images, such layers are composed of nanoparticles of about 60-70 nm in diameter, while IR spectroscopy data confirmed the presence of functional groups introduced during the synthesis. Such functionalization technique allows combining sorption and membrane technology and could be successfully used to remove trace quantities of copper, cadmium, and silver metal ions from aqueous solutions.

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Mesoporous silica containing Si(CH2)3NHC(S)NHC2H5 functional groups in the surface layer

Cited by 10 publications

References 22 publications

Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Synthesis of Sulfur-Grafted Chitosan Biopolymers and Improvement to Their Sorption of Silver Ions from Different Aqueous Solutions

Modification of Ceramic Membranes by Silica Nanoparticles with Thiourea Functions

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