Engineering and optimization of nano- and mesoporous silica fibers using sol–gel and electrospinning techniques for sorption of heavy metal ions

Ma, Zhijun; Ji, Huijiao; Teng, Yan; Dong, Guoping; Zhou, Jiajia; Tan, Dezhi; Qiu, Jianrong

doi:10.1016/j.jcis.2011.02.066

Cited by 73 publications

(56 citation statements)

References 27 publications

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“…These membranes can thus be used for highly acidic effluents. Silica nanofibers have recently shown their added value for removal of heavy metal ions and dyes via sorption [25][26][27]. So far they…”

Section: Introductionmentioning

confidence: 99%

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Geltmeyer

Teixido

Meire

et al. 2017

Separation and Purification Technology

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Abbreviations 1 1 PA 6: polyamide 6, MB: Methylene Blue, IL: inline, DC: dip-coating, H: hydrophilic 2 ABSTRACT Titania has already proven its added value for air and water treatment. The higher the surface-to-volume area, the better the performance of the TiO2 photocatalyst. These nanoparticles are typically applied in a slurry form. The use of titania nanoparticles in suspension has, however, multiple disadvantages such as a high turbidity and complex recovery of the photocatalyst after use. Therefore, immobilization of titania nanoparticles on a porous support such as a nanofibrous membrane, can be highly valuable for water treatment. These TiO2 functionalized nanofibrous membranes may be used not only in a membrane separation reactor, but also in a contact reactor. In this study, TiO2 nanoparticles were immobilized on both polymer (polyamide 6) and ceramic (silica) nanofibrous membranes. Polymer nanofibers are chosen as they are the state-of-the-art material, silica nanofibers on the contrary are less studied but show additional advantages due their excellent chemical and thermal stability and can thus offer a clear benefit for a wider range of applications. Two immobilization techniques were used, namely inline functionalization and dip-coating. Inline functionalization showed to be the preferred method for polyamide 6 nanofibrous membranes, dip-coating for silica nanofibrous membranes. Complete degradation of isoproturon, an actual concern in water treatment, is shown. Even the widely available commercial TiO2 nanoparticles allowed for a complete isoproturon removal as the result of a correct immobilization process on nanofibrous materials. This clearly opens up the high value of TiO2 functionalized nanofibrous membranes for organic (micro)pollutants removal.

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Section: Introductionmentioning

confidence: 99%

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Geltmeyer

Teixido

Meire

et al. 2017

Separation and Purification Technology

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“…[13] were used as template for synthesizing the microporous BGFs through modified Stöber method. Ca(NO 3 ) 2 Á 4H 2 O (99 wt%), TEOS (Tetraethoxysilane, 99 wt%), TEP (Triethyl phosphate, 99 wt%) were chosen as BGs precursor and CTAB (Cetyltrimethylammonium bromide, 99 wt%) acted as pore-forming surfactant.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, preparation of submicron/nano BGFs with organized micro/mesoporous structure has never been reported. Based on our previous investigations [13], herein, we demonstrate the preparation of submicron BGFs with microporous structure through sol-gel combined electrospinning technique [14] and modified Stöber method [15]. According to the characters of the as-prepared BGFs, it is nominated as cSiO 2 @mBG, wherein ''c'' means ''condensed'' and ''m'' means ''microporous''.…”

Section: Introductionmentioning

confidence: 99%

Core–shell glass fibers with high bioactivity and good flexibility

Dong

et al. 2012

Materials Letters

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“…Batch adsorption experiment was performed in 100 mL-conical asks containing 25 mg adsorbents and 25 mL Cd(II) ion or MB solution, shaken at 150 rpm for 12 h at (25 AE 1 C). Adsorption thermodynamics was conducted at the temperatures ranging from 298 K to 338 K with varying initial concentration of Cd(II) (100, 150, 200, 300, 400, 500 mg L À1 ) and MB (10,15,20,25,30,35 A sample of silica hybrid hollow spheres (25 mg) was suspended in 25 mL of 100 mg L À1 Cd(II) ions solution at several pH values (2,3,4,5,6,7).…”

Section: Heavy Metal Ion and Organic Dye Adsorption Experimentsmentioning

confidence: 99%

“…Nowadays, new types of silica based adsorbents have attracted a great deal of interest for their large specic area, controllable surface structure, and good adsorption capacity and separation. 25,26 Hollow structured silica has been also used to remove organic and inorganic pollutants owing to its large capacity, low density, thermal stability, low toxic, mild synthetic condition and easily controllable morphology. Pérez-Quintanilla et al 21 prepared SBA-15 chemically modied with 2-mercaptopyrimidine using a homogeneous method and this solid was employed as Cd(II) adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Adsorptions of Cd(ii) and methylene blue from aqueous solution by silica hybrid hollow spheres

Liu

Xiao

2015

RSC Adv.

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Silica hybrid hollow spheres were successfully synthesized by co-hydrolysis and condensation reactions of TEOS and vinyltrimethoxysilane (VTMS) under the catalysis of ammonia. The as-obtained silica hybrid hollow spheres were used as adsorbents for the removal of Cd(II) and methylene blue (MB) from aqueous solutions. The isotherm adsorption data of the silica hybrid hollow spheres for Cd(II) and MB followed the Langmuir isotherm model. The silica hybrid hollow spheres exhibited the adsorption capacities as high as 54.702 and 25.242 mg g À1 for Cd(II) and MB, respectively. The adsorption kinetics of Cd(II) and MB onto the silica hybrid hollow spheres can be well fitted to the pseudo-second-order model. The adsorption processes of Cd(II) and MB onto the silica hybrid hollow spheres at 298, 318 and 338 K could be carried out spontaneously.Scheme 1 Schematic diagram of the silica hybrid hollow spheres via one step and their adsorption for Cd(II) and MB.This journal is

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Engineering and optimization of nano- and mesoporous silica fibers using sol–gel and electrospinning techniques for sorption of heavy metal ions

Cited by 73 publications

References 27 publications

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Core–shell glass fibers with high bioactivity and good flexibility

Adsorptions of Cd(ii) and methylene blue from aqueous solution by silica hybrid hollow spheres

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