2-Mercaptothiazoline modified mesoporous silica for mercury removal from aqueous media

Pérez‐Quintanilla, Damián; Hierro, Isabel del; Fajardo, Mariano; Sierra, Isabel

doi:10.1016/j.jhazmat.2005.11.004

Cited by 174 publications

(65 citation statements)

References 28 publications

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“…The intermediate product (SG-PS) silica gel encapsulated by polystyrene was dried under vacuum at 50°C. 2 10 g SG-PS and 80 mL concentrated nitric acid were taken in a 250 mL flask, and concentrated sulfuric acid was slowly added with quick stirring keeping the temperature below 15°C. After complete additon of sulfuric acid, the reaction was conducted for 12 h at 30°C.…”

Section: Synthesis Of Sg-psmentioning

confidence: 99%

“…Among the inorganic oxides, silica gel is widely used as inorganic solid matrix in inorganic-organic composite materials due to its excellent thermal and mechanical stability, unique large surface area and well-modified surface properties [2][3]. The silica gel-polymer composite materials have received a great deal of attention recently because of their excellent performance in the field of chromatography, adsorption and catalysis [4][5].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of silica gel microspheres encapsulated by salicyclic acid functionalized polystyrene and its adsorption of transition metal ions from aqueous solutions

Yin

Zhao

et al. 2010

Open Chemistry

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The present study was undertaken to develop a novel adsorbent for heavy metal ions, and this paper presents the synthesis and characterization of a composite material-silica gel microspheres encapsulated by salicyclic acid functionalized polystyrene (SG-PSazo-SA) with a core-shell structure. SG-PS-azo-SA was used to investigate the adsorption of Mn ( , respectively. Thus, silica gel encapsulated by salicyclic acid functionalized polystyrene (SG-PS-azo-SA) is favorable and useful for the removal of Cu(II), Ag(I) and Au(III) metal ions.

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Section: Synthesis Of Sg-psmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of silica gel microspheres encapsulated by salicyclic acid functionalized polystyrene and its adsorption of transition metal ions from aqueous solutions

Yin

Zhao

et al. 2010

Open Chemistry

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“…The modifications of SBA-15, SBA-117 and MCM-41 with 2-mercaptothiazoline, 2-mercaptobenzothiazole, 3-aminothiazole, MCM-48 with benzoyl thiourea have been reported (Perez-Quintanilla et al 2006;Walcarius et al 2003;Tzvetkova and Nickolov. 2012).…”

Section: Introductionmentioning

confidence: 96%

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

2018

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The present study explored the feasibility of using derived and thiourea-functionalized silica as adsorbent for the removal of cadmium under different experimental conditions. Effects of various parameters such as function of point of zero charge (pH PZC ), solution pH, sorbent-sorbate resident time and ratio, concentration and temperature were investigated. The sorption of cadmium followed the pseudo-second-order rate kinetics. Thermodynamic studies revealed that the sorption of cadmium was endothermic and spontaneous, with good affinity toward the sorbent. Various isotherm models, viz. Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Harkins-Jura, and Halsey isotherms were used to analyze the equilibrium data at different temperatures. The Freundlich, Halsey, Langmuir, and Temkin models were found to be in good agreement with the experimental data with high R 2 , low RMSE, and low χ 2 values. The results show that the sorption capacity increases with an increase in solution temperature from 28 to 65 °C. The maximum sorption capacity calculated from Langmuir isotherm was 27.55 and 28.41 mg g −1 for derived and thiourea-functionalized silica, respectively, at optimum condition of pH 5 and contact time of 120 min.

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“…Organically functionalized mesoporous silicas are promising adsorbents with high adsorption capacity for heavy metal ions [7,[14][15][16][17][18][19]. The adsorption mechanism for the removal of the heavy metal ions in an aqueous solution is either by electrostatic interaction or by chelation [17,20].…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption mechanism for the removal of the heavy metal ions in an aqueous solution is either by electrostatic interaction or by chelation [17,20]. However, for an efficient mass transfer of the adsorbate, pore sizes must be large enough.…”

Section: Introductionmentioning

confidence: 99%

Removal of lead(II) ions from aqueous solutions using cashew nut shell liquid-templated thiol-silica materials

Mdoe¹,

Makene²

2014

Bull. Chem. Soc. Eth.

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ABSTRACT. A range of thiol-silica composites were prepared using cashew nut shell liquid (CNSL) or one of its phenolic constituents, cardanol, as templates. The procedure involved formation of a CNSL or cardanol emulsion in a water-ethanol system into which (3-mercaptopropyl)-trimethoxysilane and tetraethyl orthosilicate were simultaneously added at various ratios. The reaction mixture was aged at room temperature for 18 h followed by a Soxhlet extraction of the template and drying. The materials were characterized by diffuse reflectance Fourier transform infrared, nitrogen physisorption, scanning electron microscopy and acid titration. Results indicated that indeed the thiol-silica composites were successfully prepared, with thiol group loadings ranging from 1.6-2.5 mmol/g. The materials were tested for lead(II) adsorption, and results showed that they had maximum adsorption capacities up to 66.7 mg/g, depending on the thiol group loading and type of template used in preparing the adsorbent.

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2-Mercaptothiazoline modified mesoporous silica for mercury removal from aqueous media

Cited by 174 publications

References 28 publications

Synthesis and characterization of silica gel microspheres encapsulated by salicyclic acid functionalized polystyrene and its adsorption of transition metal ions from aqueous solutions

Synthesis and characterization of silica gel microspheres encapsulated by salicyclic acid functionalized polystyrene and its adsorption of transition metal ions from aqueous solutions

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

Removal of lead(II) ions from aqueous solutions using cashew nut shell liquid-templated thiol-silica materials

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