Removal of Cr(III, VI) by quaternary ammonium and quaternary phosphonium ionic liquids functionalized silica materials

Liu, Yinghui; Guo, Lin; Zhu, Lili; Sun, Xiaoqi; Chen, Ji

doi:10.1016/j.cej.2009.12.012

Cited by 127 publications

(30 citation statements)

References 47 publications

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“…However, for SG-3, it was achieved in the pH range of 0 to 5.2 as shown in Table 6. 182 The equilibrium was achieved at 1 h, 1 h, and 3 h for SG-2, SG-5, and SG-3, respectively. Also, the equilibrium data were well-fitted with the Langmuir isotherm model which is as shown in Table 6.…”

Section: Ionic Liquid Modified Silica Materialsmentioning

confidence: 99%

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: Ionic Liquid Modified Silica Materialsmentioning

confidence: 99%

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

2015

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“…SPE is considered to be one of the most powerful methods because it minimized the solvent usage and exposure, disposal costs, and extraction time for sample preparation. Several adsorbents have appeared due to the popularity of SPE for selective extraction of analytes, such as alumina [44], C18 [45], molecular imprinted polymers, cellulose [46], silica-gel [47,48], activated carbon [49,50] and carbon nanotubes [51,52]. This study was also planned to perform the analytical efficiency of CuO-TiO 2 NSs phase as adsorbent on the selectivity and adsorption capacity of Fe(III) prior to its determination by ICP-OES.…”

Section: Introductionmentioning

confidence: 99%

Selective Iron(III) ion uptake using CuO-TiO2 nanostructure by inductively coupled plasma-optical emission spectrometry

Rahman

Khan

Marwani

et al. 2012

Chemistry Central Journal

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BackgroundCuO-TiO2 nanosheets (NSs), a kind of nanomaterials is one of the most attracting class of transition doped semiconductor materials due to its interesting and important optical, electrical, and structural properties and has many technical applications, such as in metal ions detection, photocatalysis, Chemi-sensors, bio-sensors, solar cells and so on. In this paper the synthesis of CuO-TiO2 nanosheets by the wet-chemically technique is reported.MethodsCuO-TiO2 NSs were prepared by a wet-chemical process using reducing agents in alkaline medium and characterized by UV/vis., FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and field-emission scanning electron microscopy (FE-SEM) etc.ResultsThe structural and optical evaluation of synthesized NSs were measured by XRD pattern, Fourier transform infrared (FT-IR) and UV–vis spectroscopy, respectively which confirmed that the obtained NSs are well-crystalline CuO-TiO2 and possessing good optical properties. The morphological analysis of CuO-TiO2 NSs was executed by FE-SEM, which confirmed that the doped products were sheet-shaped and growth in large quantity. Here, the analytical efficiency of the NSs was applied for a selective adsorption of iron(III) ion prior to detection by inductively coupled plasma-optical emission spectrometry (ICP-OES). The selectivity of NSs towards various metal ions, including Au(III), Cd(II), Co(II), Cr(III), Fe(III), Pd(II), and Zn(II) was analyzed.ConclusionsBased on the selectivity study, it was confirmed that the selectivity of doped NSs phase was the most towards Fe(III) ion. The static adsorption capacity for Fe(III) was calculated to be 110.06 mgg−1. Results from adsorption isotherm also verified that the adsorption process was mainly monolayer-adsorption onto a surface containing a finite number of CuO-TiO2 NSs adsorption sites.

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“…The reaction is performed under a nitrogen atmosphere and each of the papers mentions diferent times taken for the reaction (6 2 h) and diferent temperatures ( 0 110°C). Liu and co-workers used the sol-gel method for the immobilization of the IL onto silica-based materials [53,5 ].…”

Section: Methods Used For the Immobilization Of Ils On Solid Supportsmentioning

confidence: 99%

“…lot of studies were made on the removal of Cr ions from aqueous solutions. Chromium compounds are widely applied in many industries (pigments, metallurgy, electroplating, leather tanning, stainless steel production, steel, photography) giving rise to huge quantities of wastewater containing chromium [20,53]. The discharged chromium exists in two important states of oxidation, Cr(III) and Cr(VI).…”

Section: Use Of Ionic Liquid Immobilized Solid Supports For the Remmentioning

confidence: 99%

Use of Ionic Liquids in Solid-Liquid Separation Processes

Lupa¹,

Negrea²,

Popa³

2017

Progress and Developments in Ionic Liquids

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This chapter reports the possible use of ionic liquids (ILs) in solid-liquid separation processes by their immobilization in suitable solid supports. This method presents some beneits such as economical one-due to the fact that a smaller quantity of ILs is used and the loss of ILs in the aqueous phase is avoided and second the eiciency beneitbecause the advantages of the ILs are combined with the properties of the solid support, and this enhances the removal process of metal ions from aqueous solutions and could be successfully used in the removal processes of metal ions from aqueous solutions containing trace amounts. The type of solid supports used for the immobilization of diferent ILs, and the methods used for the immobilization were discussed. "lso the adsorption eiciency of these ionic liquid immobilized solid supports in the removal process of diferent metal ions (Cr, Hg, Pt, "u, Pd, Cs, Sr, Tl, etc.) from aqueous solutions were presented. The inorganic materials present a higher eiciency to be used as solid supports for the immobilization of the ILs. It was observed that the physical method of impregnation, especially ultrasonication, has a positive efect on the adsorption capacities of the materials obtained.

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Removal of Cr(III, VI) by quaternary ammonium and quaternary phosphonium ionic liquids functionalized silica materials

Cited by 127 publications

References 47 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

Selective Iron(III) ion uptake using CuO-TiO2 nanostructure by inductively coupled plasma-optical emission spectrometry

Use of Ionic Liquids in Solid-Liquid Separation Processes

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