Liquid adsorption of basic dye using silica aerogels with different textural properties

Liu, Guoqiang; Yang, Renqiang

doi:10.1016/j.jnoncrysol.2009.11.019

Cited by 48 publications

(30 citation statements)

References 28 publications

(32 reference statements)

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“…There has been interest in developing silica oxide (SiO 2 ) aerogels with large surfaces as a new class of adsorbents for the efficient removal of organic dyes from water [8][9]. The main drawback of the adsorption method is the transfer of organic dyes from an aqueous phase to a solid phase.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of silica–titania composite aerogel beads for the removal of Rhodamine B in water

Zhu

Liang

et al. 2015

RSC Adv.

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Silica-titania (SiO 2 -TiO 2 ) aerogel beads are synthesized by a single-step sol-gel reaction, followed by supercritical drying. The SiO 2 -TiO 2 aerogel beads consist of nanoparticles, which interconnect to form mesoporous networks. The TiO 2 nanoparticles distributed in the mesoporous networks have anatase phase. The SiO 2 -TiO 2 aerogel beads with large adsorption capacities and high photocatalytic activities can efficiently remove Rhodamine B (RhB) from water. They can be easily recovered from the reaction solution and retain excellent removal capabilities even after several successive adsorption-photodegradation cycles.

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Section: Introductionmentioning

confidence: 99%

Synthesis of silica–titania composite aerogel beads for the removal of Rhodamine B in water

Zhu

Liang

et al. 2015

RSC Adv.

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“…The pseudo-second order equation can be written as follows (14) where k 2' is the pseudo-second order rate constant (g.mg -1 .min -1 ).…”

Section: The Integrated Second Order Equation Ismentioning

confidence: 99%

“…The ease in controlling the porosity and surface properties of these adsorbents helps in tuning their affinity to specific adsorbates. Although recent studies focused on the use of alumina 10 , silica 2,3,11,12 , and titania 13 sol-gel materials in general as adsorbents for pollutants from wastewater, very few reported the use of the highly interesting porous aerogels for the treatment of contaminated wastewater with organic dyes [13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Surface-functionalized silica aerogels and alcogels for methylene blue adsorption

et al. 2015

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Surface-functionalized silica aerogels and alcogels prepared via a two-step sol-gel process through the combination of different silicon precursors were used in adsorption of methylene blue dye molecules from aqueous media. The effect on adsorption in batch reactors of the nature of precursors, the solvent used in the adsorbents synthesis, and the pH of the dye solution was monitored. Phenyl-functionalized silica materials revealed the highest adsorption capacity. Two phenyl-modified silica aerogels were widely tested in adsorption under various experimental conditions where the effect of pH, temperature, contact time, initial dye concentration, and adsorbent dose were investigated. The synthesis solvent was found to have a clear effect on the behavior of the adsorbent.Optimal conditions were found at pH 8 and 9 where the adsorbent-adsorbate surface charge interactions and the π-π stacking are most favourable. The adsorption followed a pseudo-second order kinetics, indicative of a co-existing chemisorption and physisorption processes. The adsorption data fitted the Sips isotherm and exhibited for the best aerogel a maximum adsorption capacity of 49.2 mg of dye per gram of adsorbent. The thermodynamic study revealed the adsorption of methylene blue onto phenylfunctionalized silica aerogels to be an exothermic and ordered adsorption process.

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“…Bryleva et al 17 carried out the fabrication of silica nanoparticles in CTAB micellar media. Liu et al 18 used the textural properties of silica aerogels for removing basic dye. Mahmoodi and co-workers 19 used the amine functionalization over silica nanoparticles for dye removal activities.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Dye Adsorption on Silica Nanoparticles: Effects of Surface Functionalization and Other Operational Parameters

Chaudhary¹,

Sood²,

Mehta³

2016

j nanosci nanotechnol

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The dye removal efficiency of Silica nanoparticles prepared by simple and facile method has been carried out in this work. The comparative role of surface functionalization over Silica nanoparticles has also been studied in details. The adsorption measurements with varied initial pH value, absorption dosage, and dye concentration were also conducted for optimizing the system. The obtained adsorption data were assessed by using various isotherm models. The mechanism of dye adsorption is also been discussed. The detailed understanding of surfactant-nanoparticle, surfactant-dye and nanoparticle-dye interactions will further contributes to the overall affinity of pollutants in these functionalized media, which will further support various associated phenomena such as adhesion, heterogeneous catalysis etc. This method involves the surface functionality of surfactants over nanoparticles and the easier and safe management of major environmental issues.

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Liquid adsorption of basic dye using silica aerogels with different textural properties

Cited by 48 publications

References 28 publications

Synthesis of silica–titania composite aerogel beads for the removal of Rhodamine B in water

Synthesis of silica–titania composite aerogel beads for the removal of Rhodamine B in water

Surface-functionalized silica aerogels and alcogels for methylene blue adsorption

Comparative Study of Dye Adsorption on Silica Nanoparticles: Effects of Surface Functionalization and Other Operational Parameters

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