Extraction of metal ions using chemically modified silica gel: a PIXE analysis

Jal, P. K.; Dutta, Robin K.; Sudarshan, M.; Saha, Ardhendu; Bhattacharyya, Sambhu N.; Chintalapudi, S. N.; Mishra, Bijay K.

doi:10.1016/s0039-9140(00)00678-0

Cited by 41 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the surface of active silicagel, the structure terminates in a large number of silanol groups (≡Si OH). The most common method of silica-gel surface modification involves the reaction of surface hydroxyl group with silane coupling reagents which act as precursors for further immobilization of organic ligands [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Comparison of synthesis of chelating resin silica-gel-supported diethylenetriamine and its removal properties for transition metal ions

Zhang

Sun

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Comparison of synthesis of chelating resin silica-gel-supported diethylenetriamine and its removal properties for transition metal ions

Zhang

Sun

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…For sterical reasons direct introduction of Si-O-C bonds from reaction with 1,4-dibromobutane on activated silica is attained with metal preconcentrations purposes [71]. Another less exploited route for silica functionalization is the use of CNBr for direct incorporation of -Si-OCN groups onto the silica surface followed by subsequent reactions with nucleophiles [72,73].…”

Section: Coupling Agentsmentioning

confidence: 99%

Organic Modification of Hydroxylated Nanoparticles: Silica, Sepiolite, and Polysaccharides

Tiemblo

García

Hoyos

et al. 2015

Handbook of Nanoparticles

View full text Add to dashboard Cite

The incorporation of organic compounds onto the surface of nanoparticles (NPs) differs from the same reactions carried out on macroscopic surfaces in that the former are characterized by surfaces energies much higher than the latter. Consequently, surface stabilization mechanisms of NPs are very active, and among them NP self-aggregation is the first and most important. In NP surface modification, the ability of the experimental conditions to destroy self-aggregation will determine the extent to which the NP surface is modified and so, the modified NP nature. A second consequence of the high-surface free energy is the NP surface avidity to interact chemically or physically with other compounds: NPs readily adsorb water, gases, vapors, or other higher molecular weight substances, and in the particular case of hydroxylated NP, chemical reactivity is both high and rich. This chapter will deal with the surface modification of silica, sepiolite, and polysaccharides. Experimental strategies, resulting organo-NPs, their structure and properties, and frequent uses and applications of them will be reviewed.

show abstract

“…After this operation, the silica is subjected to drying under vacuum and then to an end-capping reaction with hexamethyldisilazane in order to deactivate the free silanol groups remaining on the silica surface. 18 …”

Section: Chemical Modification Of Silica Gelmentioning

confidence: 99%

Extraction of Metal Ions Using Chemically Modified Silica Gel Covalently Bonded with 4,4’-Diaminodiphenylether and 4,4’-Diaminodiphenylsulfone-salicylaldehyde Schiff Bases

et al. 2006

View full text Add to dashboard Cite

Silica gel is an amorphous inorganic polymer containing an internal siloxane group (Si-O-Si) with silanol groups (Si-OH) distributed on the surface.1,2 It is commonly used as a rigid matrix for ligand immobilization. 3 The chemical modification of silica gel surfaces with donor atoms such as N, S, O and P is primarily aimed at improving the adsorption and exchange properties of the silica gel along with incorporation of the particular selective characteristics into the modified silica gel phases towards certain metal ions. 4 The immobilization of chelating materials containing donor atoms on the silica gel surface can occur via chemical bond formation between organic modifiers like amino or chloro modified silica gel phases or through simple physical adsorption processes.5 Such a process often incorporates selectivity in synthesized materials. 6,7 Several new chemically modified silica gels were synthesized, and applied as normal or selective solid phase extractor for many toxic and other metal ions. They were found to be superior to the conventional ion exchange resins in their ability to extract and selectively preconcentrate the heavy metal ions from solutions containing high concentrations of alkali and alkaline earth metal ions. [8][9][10] Advantages of the modified solid phase extractors compared with the classical liquid extractor's were reported in many references. 11,12Schiff bases, having multidentate coordination sites, are known to form complexes with transition metal ions readily. 13,14The Schiff bases derived from salicylaldehyde (Salens) as polydentate ligands are known to form stable complexes with transition metal ions. 15,16 The present work describes the syntheses of two new chemically modified silica gel covalently bonded with 4,4′-diaminodiphenylether and 4,4′-diaminodiphenylsulfonesalicylaldehyde Schiff bases.The synthesized chelating materials were used for the preconcentration and separation of Cr 3+ , Zn 2+ , and Mn 2+ from dilute aqueous solutions. They were compared to determine their metal binding, extraction and selective abilities using batch techniques. The more reactive chelating material, Si-DDE-o-HB, was utilized in a column technique for the preconcentration of Zn 2+ and Cr 3+ . Elution of the sorbed cations in column experimental studies provided an example of using the chelating material in continuous cycle operation and recovery of the metal ions. The analytical precision and accuracy of the result were tested with satisfactory results, and the method was found to be rapid, precise, simple and convenient to use. Experimental ApparatusThe specific surface areas of the dry silica and loaded silica were determined by BET method on NOVA 1000, high speed gas sorption analyzer, Quantachrome Corporation, USA. A Shimadzu atomic absorption spectrophotometer (Model AA-680) equipped with a single element hollow cathode lamp and an air-acetylene burner was used for the estimation of metal ions. The instrument parameters were those recommended by the manufacturer. The wave lengths (nm) s...

show abstract

Extraction of metal ions using chemically modified silica gel: a PIXE analysis

Cited by 41 publications

References 20 publications

Comparison of synthesis of chelating resin silica-gel-supported diethylenetriamine and its removal properties for transition metal ions

Comparison of synthesis of chelating resin silica-gel-supported diethylenetriamine and its removal properties for transition metal ions

Organic Modification of Hydroxylated Nanoparticles: Silica, Sepiolite, and Polysaccharides

Extraction of Metal Ions Using Chemically Modified Silica Gel Covalently Bonded with 4,4’-Diaminodiphenylether and 4,4’-Diaminodiphenylsulfone-salicylaldehyde Schiff Bases

Contact Info

Product

Resources

About