Silylated calcium phosphates and their new behavior for copper retention from aqueous solution

Silva, Oberto Grangeiro da; Fonseca, Maria G.; Arakaki, Luiza N.H.

doi:10.1016/j.colsurfa.2006.12.072

Cited by 33 publications

(16 citation statements)

References 28 publications

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“…On the other hand, the silylation of porous and nonporous solid materials has been widely used in different fields. The silylating agents make possible the covalent attachment of functional groups by displacement of active hydrogen atoms originally attached to hydroxyl groups by organosilyl derivatives of precursor silane (da Silva et al 2007). The idea of grafting functional groups onto the surfaces of solid materials is a known strategy for the design of promising new adsorbents and catalysts.…”

Section: Introductionmentioning

confidence: 99%

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

et al. 2009

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A commercial activated carbon was functionally modified by silylation with 3-aminopropyltriethoxysilane (APTES). The silylation led to the fixation of weakly basic functional groups, -NH 2 , on the surface as indicated by pH titration, Boehm titration, N 2 − BET analysis and X-ray photoelectron spectroscopic (XPS) analysis. Despite reducing the specific BET area and the pore volume, silylation improved the H 2 S removal capacity so that APTES modified activated carbon (APTES-AC) was 3.55 times more effective than the original activated carbon. XPS results indicate that H 2 S removal may be associated with the amino (-NH 2 ) group and the presence of sulfur in the four oxidation states S 2− , S 0 , S 4+ and S 6+ . The effects of moisture, oxygen content and temperature on the performance of APTES-AC for H 2 S removal were investigated. The presence of moisture in the gas stream was found to have an adverse effect on the H 2 S removal, whilst the presence of oxygen favored the removal of H 2 S by APTES-AC. The higher removal capacity of APTES-AC relative to the original activated carbon indicates that APTES-AC is a potential candidate for the removal of H 2 S from gas streams. The H 2 S removal efficiency of APTES-AC was proved be superior to that of Na 2 CO 3 -impregnated AC by the pilot-scale test of purification H 2 S containing industrial waste gas, yellow phosphorus off-gas.

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Section: Introductionmentioning

confidence: 99%

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

et al. 2009

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“…The broad and strong band observed at 3436 cm -1 is due to the stretching vibration of H-bonded silanol group m(-Si-OH) along with H-OH vibration of the water molecules m(-OH) adsorbed The spectrum of the modified silica displays almost same characteristic bands of free silica with some changes; for example, the intensity of the free silanol group at 966 cm -1 was decreased and it almost disappeared in the amino modified silica (SiCPMS) (Fig. 2) [18,[47][48][49][50][51][52]. The bands observed at 1100 and 806 cm -1 represent the Si-O-Si groups and the deforming and bending modes of the Si-O-Si bond, respectively.…”

Section: Ftir Examiningmentioning

confidence: 92%

“…FTIR spectra are the most widely used tool to identify functional groups in a molecule and obtain structural and bond information on a complex [18,[47][48][49][50][51][52]. The adsorbent was characterized by FTIR spectroscopic analysis before and after the modification process (Fig.…”

Section: Ftir Examiningmentioning

confidence: 99%

Solid phase extraction using silica gel modified with azo-dyes derivative for preconcentration and separation of Th(IV) ions from aqueous solutions

Kırkan

Ayçık

2015

J Radioanal Nucl Chem

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Azo-dyes derivative (HL) sorbent was synthesized according to the literature to be used in the adsorption and preconcentration of Th(IV) ions from aqueous solution and it was exposed to immobilization, and new solid support material was obtained. For this purpose, azo-dyes derivative (HL) was chemically bonded to silica gel surface immobilized 3-chloropropyl trimethoxysilane, then analyzed by FTIR, BET, SEM and elemental analysis. The influence of the solution pH, initial Th(IV) concentration, amount of sorbent, contact time, temperature and foreign ion effect was investigated. The maximum Th(IV) uptake capacity was found to be 24.85 ± 0.2 mg/g.

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“…SiO2 above analysis of infrared spectrum suggests that the strong interaction presents at the interface of SiO 2 -Si-APTS and Si-APTS-CPGO, so Si-APTS is successfully modified by CPGO [20][21][22] (Fig. 2).…”

Section: Surfacementioning

confidence: 95%

Immobilization of oxime derivative on silica gel for the preparation of new adsorbent

Gübbük

Hatay

Coşkun

et al. 2009

Journal of Hazardous Materials

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Silylated calcium phosphates and their new behavior for copper retention from aqueous solution

Cited by 33 publications

References 28 publications

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

Solid phase extraction using silica gel modified with azo-dyes derivative for preconcentration and separation of Th(IV) ions from aqueous solutions

Immobilization of oxime derivative on silica gel for the preparation of new adsorbent

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