Adsorption behaviors of nano-sized ETS-10 and Al-substituted-ETAS-10 in removing heavy metal ions, Pb2+ and Cd2+

Choi, Jeong-Hoo; Kim, S.D.; Noh, Si Hyun; Oh, Seung Jin; Kim, W.J.

doi:10.1016/j.micromeso.2005.06.043

Cited by 48 publications

(10 citation statements)

References 16 publications

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“…Pb heads the list of environmental threats because, even at extremely low concentrations, lead has been shown to cause brain damage in children [10]. Many physicochemical methods have been proposed for their removal from industrial effluents [11], such as electro-chemical precipitation, ultrafiltra- tion, ion exchange and reverse osmosis [12]. A major drawback with precipitation is sludge production.…”

Section: Introductionmentioning

confidence: 99%

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Kazemipour

Ansari

Tajrobehkar

et al. 2008

Journal of Hazardous Materials

246

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Section: Introductionmentioning

confidence: 99%

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Kazemipour

Ansari

Tajrobehkar

et al. 2008

Journal of Hazardous Materials

246

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“…Sometimes, treating heavy metal sludge is more difficult than treating heavy metal-containing wastewaters. Therefore, other methods such as electrodialysis (Mohammadi et al, 2004(Mohammadi et al, , 2005Schlichter et al, 2004), reverse osmosis (Kryvoruchko et al, 2004;Ujang and Anderson, 1998), biosorption including some economic bio-adsorbent (Aksu and Dönmez, 2001;Bhattacharyya and Sharma, 2004;Evans et al, 2002;Kapoor and Viraraghavan, 1998;Sag and Kutsal, 1995;Tarley and Arruda, 2004), adsorption (Choi et al, 2006;Lyubchik et al, 2004;Park and Kim, 2005;Suh and Kim, 2000;Yu et al, 2000), and ion exchange process are developed to remove heavy metals from industrial wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and kinetics of heavy metal ion exchange

Lee

Kuan

Chern

2007

Journal of the Chinese Institute of Chemical Engineers

111

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Distribution Pattern of Length, Length Uniformity, and Density of TiO₃²⁻ Quantum Wires in an ETS‐10 Crystal Revealed by Laser‐Scanning Confocal Polarized Micro‐Raman Spectroscopy

et al. 2011

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ETS-10 is a highly intriguing microporous titanosilicate [1][2][3] that has shown an excellent propensity for the selective removal of harmful heavy-metal ions, [4][5][6][7][8][9] the potential to work as an effective catalyst for various reactions, [10][11][12][13][14][15] and that can be used as a material for solar cells.[ (Figure 1). [1][2][3][17][18][19][20][21][22][23][24][25][26][27] The TiO 3 2À quantum wire is a one-dimensional (1D) extreme of three-dimensional (3D) bulk titanates, which are widely used in industry as, for example, capacitors. [28] It also exhibits an interesting 1D quantum confinement effect. [17] The TiO 3 2À quantum wires are not expected to be connected all the way from one face to the opposite face of a crystal owing to the large number of randomly distributed defects. [17][18][19][20][21][22][29][30][31][32][33][34][35][36][37] Now the questions are what is the average length of the wires, to what degree do the lengths vary (how does the length homogeneity vary), how does the local density of the quantum wire vary from one region to another within a crystal, do they vary randomly or in accordance with a certain pattern? Answers to the above questions will be highly useful for understanding the mechanism of ETS-10 formation and growth, the refinement of its structure, improvements of its catalytic activities, and its future applications. However, there have been no methods to gain such information.The TiO 3 2À quantum wire in ETS-10 gives a strong Raman shift band between 724 and 840 cm À1 , arising from a longitudinal vibrational mode of the -Ti-O-Ti-O-chain. Its frequency at the band maximum (n max ), its bandwidth (full width at half maximum, fwhm), and intensity (I) reflect the relative average length, length homogeneity, and density of the quantum wire, respectively. The Raman band frequency decreases as the length increases, owing to the increase in the reduced mass of the quantum wire. The smallest frequency ever observed is 724 cm À1 . Bandwidths between 23 and 120 cm À1 have been observed, and the bandwidth decreases as the length uniformity increases. The intensity increases as the number of the TiO 3 2À quantum wire increases. Accordingly, the frequency, bandwidth, and intensity have served as the three important criteria for comparison of the relative average lengths, relative average length uniformities, and relative average densities of the TiO 3 2À quantum wires in the ETS-10 crystals. This information indicates that we can also apply the same principle to obtain their distribution pattern within an ETS-10 crystal if we can obtain a matrix of Raman spectra measured from a large number of artificially divided very small sections of a crystal. Furthermore, the obtained data would be more informative if we can obtain a map of these three data sets for the TiO 3 2À quantum wires running along the [110] and [11 0] directions, respectively.We now report that laser scanning confocal polarized micro-Raman (LSC-PMR) spectroscopy is a highly useful tool for the above purpose a...

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Adsorption behaviors of nano-sized ETS-10 and Al-substituted-ETAS-10 in removing heavy metal ions, Pb2+ and Cd2+

Cited by 48 publications

References 16 publications

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Equilibrium and kinetics of heavy metal ion exchange

Distribution Pattern of Length, Length Uniformity, and Density of TiO₃²⁻ Quantum Wires in an ETS‐10 Crystal Revealed by Laser‐Scanning Confocal Polarized Micro‐Raman Spectroscopy

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Adsorption behaviors of nano-sized ETS-10 and Al-substituted-ETAS-10 in removing heavy metal ions, Pb2+ and Cd2+

Cited by 48 publications

References 16 publications

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Removal of lead, cadmium, zinc, and copper from industrial wastewater by carbon developed from walnut, hazelnut, almond, pistachio shell, and apricot stone

Equilibrium and kinetics of heavy metal ion exchange

Distribution Pattern of Length, Length Uniformity, and Density of TiO32− Quantum Wires in an ETS‐10 Crystal Revealed by Laser‐Scanning Confocal Polarized Micro‐Raman Spectroscopy

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Distribution Pattern of Length, Length Uniformity, and Density of TiO₃²⁻ Quantum Wires in an ETS‐10 Crystal Revealed by Laser‐Scanning Confocal Polarized Micro‐Raman Spectroscopy