Preparation and characterization of functionalized silica spheres for removal of Cu(ii), Pb(ii), Cr(vi) and Cd(ii) from aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28624-28632 ◽  
Author(s):  
Zhen Zhu
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Removal Efficiency ◽  
Mesoporous Structure ◽  
Environmentally Benign ◽  
Silica Spheres ◽  
Functionalized Silica

Functionalized silica spheres (SMS) with mesoporous structure were fabricated through a facile and environmentally benign route, and exhibited remarkable removal efficiency for metal ions from aqueous solutions.

Preparation and Characterization of Highly Monodisperse Vinyl Functionalized Silica Spheres by Sol-Gel Method

2012 ◽  
Vol 560-561 ◽  
pp. 8-12 ◽  
Author(s):  
Zhong Ming Zhang ◽  
Lian Xi Chen ◽  
Jie Li ◽  
Cai Bin Jiao
Keyword(s):  
Sol Gel ◽  
Ammonia Concentration ◽  
Silica Spheres ◽  
Mixed Solution ◽  
Functionalized Silica ◽  
Uniform Size ◽  
Hybrid Silica ◽  
Ft Ir ◽  
Scanning Electron

Highly monodisperse and uniform-size vinyl functiona-lized silica spheres were synthesized directly from vinyltriethoxysilane (VTES) in water/ethanol mixed solution, and in this system, we successfully controlled the size and shape of hybrid silica spheres by adjusting the concentrations of the precursor VTES and catalyst ammonia. On the basis of the experiment results, it was found that hybrid spheres size significantly increased as the increment of concentration of VTES. However, increasing ammonia concentration resulted in decreasing of diameter of hybrid silica spheres from 542 to 272 nm. The morphologies and structure were determined by Field Emission Scanning Electron Microscopy (FE-SEM) and Fourier transformed infrared (FT-IR).

Preparation and Characterization of CdTe/SiO2 Composite

2011 ◽  
Vol 233-235 ◽  
pp. 1946-1949
Author(s):  
Mei Ping Wang ◽  
Jin Hui Lin ◽  
Xiao Li Hao
Keyword(s):  
Aqueous Solutions ◽  
Sol Gel ◽  
Silica Spheres ◽  
Gel Method ◽  
The Core ◽  
Cdte Nanocrystals ◽  
Luminescence Peak ◽  
Sodium Tellurite ◽  
Phosphate Buffered Saline

TGA- stabilized CdTe nanocrystals (NCs) were prepared using sodium tellurite as tellurium source, which avoids the cumbersome processes associated with H2Te or NaHTe sources. Fluorescent CdTe/SiO2composites were prepared by a sol–gel method without the exchange of surface ligands. The composites were characterized with TEM and fluorescence spectrophotometer and investigated their stability in phosphate-buffered saline (PBS) buffer. CdTe NCs were loaded into the core of silica spheres during the formation of composite spheres. In contrast to CdTe NCs in aqueous solutions, CdTe NCs in the composite revealed better stability and the luminescence peak show red-shift.

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

2010 ◽  
Vol 8 (1) ◽  
pp. 214-222 ◽  
Author(s):  
Qiang Xu ◽  
Ping Yin ◽  
Guifang Zhao ◽  
Gui Yin ◽  
Rongjun Qu
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Silica Gel ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Maximum Adsorption Capacity ◽  
Salicyclic Acid

AbstractThe 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-PS-azo-SA) with a core-shell structure. SG-PS-azo-SA was used to investigate the adsorption of Mn(II), Co(II), Ni(II), Fe(III), Hg(II), Zn(II), Cd(II), Cr(VI), Pd(II), Cu(II), Ag(I), and Au(III) from aqueous solutions. The results revealed that SG-PS-azo-SA has better adsorption capacity for Cu(II), Ag(I) and Au(III). Langmuir and Freundlich isotherm models were applied to analyze the experimental data, the best interpretation for the experimental data was given by the Langmuir isotherm equation with the maximum adsorption capacity for Cu(II), Ag(I), and Au(III) at 1.288 mmol g−1, 1.850 mmol g−1 and 1.613 mmol gt-1, 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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