FTIR spectroscopy study of the structure changes of palygorskite under heating

Yan, Wu; Liu, Dong; Tan, Daoyong; Yuan, Peng; Chen, Ming

doi:10.1016/j.saa.2012.07.085

Cited by 205 publications

(83 citation statements)

References 17 publications

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“…1). There is also a gradual decrease in the intensity of the band at 3,200-3,800 cm −1 which is associated with OH stretching of water coordinated to Al, Mg and zeolitic water [12], although the band intensity slightly increased at 473.15 K because of the re-adsorption of water during the experimental procedure as has been reported by other researchers [13] Table 3 shows the variation of specific surface, external surface area, pore volume and pore size with calcination temperature. The external surface area was calculated from the PSD generated by laser diffraction by first transforming the volume distribution to a number density distribution and then using the method of moments to calculate the second moment (m 2 equivalent to external surface area) [17].…”

Section: June 2011supporting

confidence: 74%

Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

Falayi

Ntuli

2015

Korean J. Chem. Eng.

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Attapulgite calcined at 973.15K was characterized and utilized as an adsorbent for the removal of heavy metals and neutralization of acid mine drainage (AMD) from a gold mine. Batch adsorption experiments were carried out using a thermostatic shaker. Activated attapulgite showed that it can neutralize AMD as it raised the pH from 2.6 to 7.3 after a residence time of 2 h. Metal ion removal after 2 h was 100% for Cu (II), 99.46% for Fe (II), 96.20% for Co (II), 86.92% for Ni (II) and 71.52% for Mn (II) using a 2.5% w/v activated attapulgite loading. The adsorption best fit the Langmuir isotherm; however, Cu (II), Co (II), and Fe (II) data fit the Freundlich isotherm as well. Calcination at 973.15 K resulted in the reduction of the equilibrium residence time from 4 to 2 h, solid loading reduction from 10 to 2.5% m/v and an increase in maximum adsorption capacity compared with unactivated attapulgite.

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Section: June 2011supporting

confidence: 74%

Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

Falayi

Ntuli

2015

Korean J. Chem. Eng.

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“…Sharp peak at 1039 cm −1 and 541 cm −1 belonged to the stretching of Si-O-Si bond in palygorskite tetrahedral sheet, which in parallel with peak at 467 cm −1 were designated to the bending of O-Si-O bonds (Fig. 7) [22]. Peak at 3698 cm −1 was due to the vibration of -OH in Mg-OH, while the vibration and bending of water molecules (coordinated or zeolitic) appeared at 3450 and 1654 cm −1 , respectively (Fig.…”

Section: Fourier Transforms Infrared Spectroscopy (Ftir)mentioning

confidence: 98%

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Rusmin

Sarkar

Liu

et al. 2015

Applied Surface Science

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a b s t r a c tThis paper investigates the structural evolution of chitosan-palygorskite (CP) composites in relation to variable mass ratios of their individual components. The composite beads' performance in lead (Pb) adsorption from aqueous solution was also examined. The composite beads were prepared through direct dispersion of chitosan and palygorskite at 1:1, 1:2 and 2:1 mass ratios (CP1, CP2 and C2P, respectively). Analyses by Fourier transform Infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed the dependence of the composites' structural characteristics on their composition mass ratio. The chitosan-palygorskite composite beads exhibited a better Pb adsorption performance than the pristine materials (201.5, 154.5, 147.1, 27.7 and 9.3 mg g −1 for CP1, C2P, CP2, chitosan and palygorskite, respectively). Adsorption of Pb by CP1 and CP2 followed Freundlich isothermal model, while C2P fitted to Langmuir model. Kinetic studies showed that adsorption by all the composites fitted to the pseudo-second order model with pore diffusion also acting as a major rate governing step. The surface properties and specific interaction between chitosan and palygorskite in the composites were the most critical factors that influenced their capabilities in removing toxic metals from water.

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“…Each ribbon is connected to the next by the inversion of SiO4 tetrahedron along the oxygen atom. This kind of arrangement makes the tetrahedrons continuously bonded via the ribbons, thereby composing of ribbons of phyllosilicate [7][8][9]. From the cross section vertical to the c-axis, the octahedron is sandwiched by two tetrahedron layer units to constitute the layer-ribbon units, forming zeolite-like channels with a size of about 0.38 nm×0.63 nm via the alternate arrangement of layer-ribbon units and channel units [10,11].…”

Section: Introductionmentioning

confidence: 99%

Advances in Composites Based on the Palygorskite Mineral Nanofibers

Liu¹,

Wang²,

Wu³

2016

Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)

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Abstract. Synthetic nanomaterials have the disadvantages of large-scale investment, high energy consumption, complex production process and heavy environmental load. Palygorskite mineral nanofibers are typical porous materials widely existing in nature and have the advantage of high surface area, moderate cation exchange capacity and excellent salt resistance, which have been widely applied as adsorbents in the dyes' removal from waste water. Due to the aggregation of palygorskite crystal bundles, it is difficult to totally release the adsorption capacity of palygorskite. Therefore, it is necessary to modify the microscopic structure of palygorskite with various physical or chemical techniques. Based on the above reason, this paper briefly summarizes the palygorskite-based composites research progress of palygorskite mineral nanofibers, and related research orientations have also been proposed.

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FTIR spectroscopy study of the structure changes of palygorskite under heating

Cited by 205 publications

References 17 publications

Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

Structural evolution of chitosan–palygorskite composites and removal of aqueous lead by composite beads

Advances in Composites Based on the Palygorskite Mineral Nanofibers

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