Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: Equilibrium and kinetic studies

Parida, Kulamani; Mishra, Krushna Gopal; Dash, Suresh Kumar

doi:10.1016/j.jhazmat.2012.09.052

Cited by 102 publications

(45 citation statements)

References 49 publications

(63 reference statements)

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“…Parida et al immobilized TiO 2 by loading different weight percentages of titania on the mesoporous MCM-41. 114 It was observed that the surface area and pore diameter of MCM-41 were decreased after increase in TiO 2 loading ( Table 3) that could be to the pore blocking. Interestingly, TiO 2 and neat MCM-41 exhibited very less adsorption of Cr(VI) as compared to the TiO 2 -MCM-41.…”

Section: Inorganically Modified Silica Materialsmentioning

confidence: 94%

Recent Advances in Silica-Based Materials for the Removal of Hexavalent Chromium: A Review

2015

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Hexavalent chromium [Cr(VI)], one of the most toxic contaminants, is released in the environment due to various anthropogenic activities. Exposure of Cr(VI) can pose a serious threat to the public health as well as flora and fauna. Effective treatment of Cr(VI) is, therefore, very essential from safety, health, and environment points of view. The present review focuses on the development of silica-based materials for the adsorption of Cr(VI) from wastewater. After discussing toxicity issues and general removal methods of Cr(VI), the importance of silica materials are highlighted. The silica has different shapes, sizes, surface areas, and pore diameters and, hence, can play a vital role in designing the adsorbent. They can be modified into organic, inorganic, polymeric, biological, and ionic liquid based materials. Therefore, they are broadly classified into these five categories. The adsorption isotherms and kinetics of these materials for Cr(VI) are discussed and compared with each other. Future prospects based on the findings of the review article are summarized in the end which mainly emphasizes the importance of biosorbents and ionic liquid immobilized silica materials for the treatment of Cr(VI).

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Section: Inorganically Modified Silica Materialsmentioning

confidence: 94%

Recent Advances in Silica-Based Materials for the Removal of Hexavalent Chromium: A Review

2015

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“…Both pseudo-first-order and pseudo-second-order kinetic models have been used for this purpose [39,[57][58][59][60]. The pseudo-first-order equation may be written in the form:…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

Applications of inorganic–organic mesoporous materials constructed by self-assembly processes for removal of benzo[k]fluoranthene and benzo[b]fluoranthene

Costa

Garcia

Santos

et al. 2015

J Sol-Gel Sci Technol

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The mesoporous materials MCM-41 and the functionalized inorganic-organic material p-aminobenzoic acid-MCM-41 (PABA-MCM-41) were used as adsorbents to remove the PAHs benzo[k]fluoranthene and benzo[b]fluoranthene from aqueous media. Both MCM-41 and PABA-MCM-41 exhibited the hexagonal mesostructures typical of the M41S family, as confirmed by SAXS, with type IV isotherms and type H1 hysteresis. The materials showed uniform mesopore size distributions, high surface areas, and thermal stability. Adsorption tests showed that for both mesoporous materials, the quantity adsorbed (q e ) increased for higher initial PAH concentrations, and adsorption equilibrium was reached in around 90 min. The experimental kinetic data were fitted using the pseudosecond-order model, and the adsorption process could be described by the Langmuir isotherm. At higher temperatures, there were increases in the initial rates of adsorption and the kinetic constants for adsorption of the PAHs by PABA-MCM-41. The thermodynamic parameters indicated that the process was spontaneous, endothermic, and with a tendency toward disorder of the system at the adsorbent/adsorbate interface. The functionalization of MCM-41 increased the efficiency of adsorption of the PAHs by 44.5 and 32.0 % for benzo[k]fluoranthene and benzo[b]fluoranthene, respectively. Graphical Abstract Effect of contact time on adsorption of (a) B[k]F and (b) B[b]F by PABA-MCM-41. Conditions: 0.05 g of PABA-MCM-41, 5 mL of each PAH solution (concentration 200 lg L -1 ), temperature of 25°C, contact time of 300 min, and agitation at 150 rpm. 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 22.2 22.3 22.4 22.5 26.5 PAH (a) Benzo[k]fluoranthene (b) Benzo[b]fluoranthene Time (min) q e (µg g -1 )

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“…It may be attributed to the fact that the TiO 2 NP itself can remove organic dye in addition to the increased surface area. [29][30][31][33][34][35]37,38,[45][46][47][48][49][50] Results for trace metals removal Following the procedures listed under the "Material and methods" section, the results of the three hybrid samples for trace metals removal were obtained using ICP-MS, and the results are shown in Table 2. For each hybrid sample, six tubes of filtered solution were collected and the sum of the adsorption rate from the six tubes gives the total adsorption rate of each sample regarding that trace metal.…”

Section: Structural Characterization Resultsmentioning

confidence: 99%

Development and characterization of a hybrid mesoporous material infused with metallic oxide nanoparticles for water treatment

Deksissa

2017

Nanomaterials and Nanotechnology

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In the current study, a hybrid mesoporous material infused with metallic oxide nanoparticles, MCM-48 with TiO 2 nanoparticles, has been developed for potential application in water treatment. MCM-48 belongs to a family of mesoporous siliceous materials-M41S, in which MCM-48 has a unique three-dimensional cubic symmetry structure. Using this hybrid approach, it will allow the polluted water to pass through the strong yet high permeable structure of mesoporous material and to allow enough time for the pollutants to react with the metallic oxide nanoparticles infused on the porous structure so that the polluted water can be treated without introducing secondary pollutants. A modified hydrothermal method has been developed to synthesize three samples of this hybrid material with TiO 2 nanoparticles of 15, 50, and 300 nm in diameter, respectively. The microstructures before and after the infusion of nanoparticles are characterized using scanning electron microscope and X-ray powder diffraction. Under the current study, the synthesized samples are tested for their capability of removing organic dye and trace metals. The results have shown that while all three hybrid materials have shown over 80% adsorption rate for organic dye, the sample synthesized using 300 nm TiO 2 nanoparticle has shown the highest adsorption rate. Similarly, the highest adsorption rate for most trace metals tested here also occurs in the sample made with 300 nm TiO 2 nanoparticle. Coincidently, the sample prepared with 300 nm TiO 2 nanoparticle has a much larger internal surface area and smaller average pore size compared to the two other samples, which may lead to the higher adsorption rate of trace metals and organic dye tested here. This study has presented a hybrid mesoporous material that can be potentially used for pollutants removal in water treatment. Future study is needed to investigate how to reuse this hybrid mesoporous material and to obtain a further understanding of the mechanism affecting the micro structures of the hybrid material.

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Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: Equilibrium and kinetic studies

Cited by 102 publications

References 49 publications

Recent Advances in Silica-Based Materials for the Removal of Hexavalent Chromium: A Review

Recent Advances in Silica-Based Materials for the Removal of Hexavalent Chromium: A Review

Applications of inorganic–organic mesoporous materials constructed by self-assembly processes for removal of benzo[k]fluoranthene and benzo[b]fluoranthene

Development and characterization of a hybrid mesoporous material infused with metallic oxide nanoparticles for water treatment

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