Vibrational spectra of cesium tellurate phosphate

doi:10.1016/0020-0891(86)90057-6

Infrared Physics

Volume 26, Issue 6, November 1986, Pages 353-356

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Abstract

The infrared and Raman spectra of cesium tellurate phosphate (Te(OH)₆·Cs₂HPO₄), a compound containing two anions, are recorded and analysed. It has been found that the two anions Te(OH)₆ and HPO₄ coexist in the crystal almost independently without affecting each other. The hydrogen atom is loosely bonded to the oxygen atom of the phosphate ion and hence the phosphate ion exists as distorted PO³⁻₄ tetrahedron rather than HPO²⁻₄ ion.

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Phosphate removal in constructed wetland with rapid cooled basic oxygen furnace slag
2017, Chemical Engineering Journal
Citation Excerpt :
The adsorption bands at 450–600 cm−1 indicated Al2O3, Fe2O3, MgO, ferrites and most metallic oxides, which are a common feature of different slags [69]. According to Viswanathan et al. [70], the band at 1085, 1030, 950, and 865 cm−1 in slag can be attributed to P-O of phosphate group. In our study, it could observe that spectra of RC-BOFS before and after phosphate adsorption were slightly different (Fig. 8).
The objective of this study was to evaluate adsorption characteristics of phosphate by rapid cooled basic oxygen furnace slag (RC-BOFS) through various conditions and removal rate of phosphate in small-scale constructed wetland with RC-BOFS as filter material. The phosphate adsorption by RC-BOFS was rapid in the first 0.5 h and the pseudo-second-order kinetic model fit the data better than the pseudo-first-order kinetic model. The maximum phosphate adsorption capacities of RC-BOFS under different pH were in the following order: 3.57 mg P g⁻¹ (pH 5) > 2.47 mg P g⁻¹ (pH 7) > 1.46 mg P g⁻¹ (pH 9). Small-size RC-BOFS (0.8–2.3 mm) was more efficient with 23% higher phosphate adsorption than big-size RC-BOFS (2.3–4.6 mm). Characterization of RC-BOFS before and after phosphate adsorption by XRD, FTIR and SEM-EDS indicated that phosphate adsorption by RC-BOFS was dominated by metal oxide and precipitation by calcium and was closely related to the slag chemical properties. The phosphate saturation time in constructed wetland with coarse sand was predicted about 292 days, whereas the longevity of constructed wetland with adding about 25% RC-BOFS to the coarse sand can significantly increase up to 1349 days. It was concluded that the horizontal flow constructed wetland with sand 75%:RC-BOFS 25% ratio could achieve high phosphate removal rate and near-neutral pH for meeting the acceptable water quality discharge standard from water treatment plant.
Fourier transform infra-red (FTIR) spectroscopy investigation, dose effect, kinetics and adsorption capacity of phosphate from aqueous solution onto laterite and sandstone
2016, Journal of Environmental Management
Citation Excerpt :
Fig. 6 presented the FTIR spectra of laterite and sandstone before and after adsorption in solution. The main absorptions bands and their attributions occurred at 1085, 1030, 950, and 865 cm−1 related to stretching of PO of phosphate group (Ramakrisshhnan et al., 1986) though they overlap some SiO stretching. Other absorptions (cm−1) occurred at: 640 [PO (H) of HPO42−]; 610 [OH bending of structural OH]; 560 [PO bending of PO43−]; 450 [P(OH) bending of HPO42−] (Oberto et al., 2007).
Environmental pollution by phosphate in developing countries is growing with extensive and diffuse pollution. Solving these problem with intensive technologies is very expensive. Using natural sorbent such as laterite and sandstone could be a solution. The main objective of the study is to evaluate the P-removal efficiency of these materials under various solution properties. Laterite and sandstone used mainly contain very high levels of finely grained iron and aluminum oxy-hydroxides and diverse dioctahedral clays. Phosphate adsorption tests were carried out using crushed laterite and sandstone. Optimal doses and pH effects on phosphate adsorption were studied with a potassium hydrogeno-phosphate solution of 5 mg/L at 30 °C. The main results were that the optimal dosage is 15 and 20 mg/L respectively for laterite and sandstone. The phosphate adsorptions efficiency of laterite and sandstone are pH-dependent, they increase when the pH grows up to the Point of Zero Charge (PZC) and slowly decrease beyond. The adsorption capacities of the materials also increase proportionally with the initial phosphate concentration. The pseudo-second-order successfully described the kinetics of the phosphate adsorption on the two adsorbents. With this model, the adsorption capacity values are obtained, which give an idea of the maximum phosphate uptake that the laterite and sandstone could achieve. The changes on the FTIR spectra of raw materials and phosphate adsorbed material confirm the mechanism of chemisorptions. Considering the above, laterite and sandstone could be used as efficient and cheap adsorbent for the removal of phosphate in aqueous solution.
Synthesis and spectroscopic characterization of complexes of Cr(III), Cr(VI), Cu(III), Zn(II), Mo(VI), Pd(II), Ag(III), Au(III) and W(VI) with telluric acid
2013, Journal of Molecular Structure
Citation Excerpt :
Four stretches are expected for the octahedral TeO6 unit: A1g + Eg + A2u + Eu [18]. The spectra show strong Raman bands in the 950 cm−1 region which may be assigned to νs(MO2) and strong IR bands (weak in Raman) in the 950–900 cm−1 region which may be attributed to νas(MO2) of the cis-MO2 moiety [32–34]. The bands in the 720–550 cm−1 region are tentatively assigned to νs(TeO6) and νas(TeO6) stretches (Table 2).
New preparative methods are reported for telluric acid complexes, Na₅[Cr(TeO₄(OH)₂)₂(H₂O)₂], Na₆[Zn(TeO₄(OH)₂)₂(H₂O)₂], Na₆[Pd(TeO₄(OH)₂)₂], Na₅[M(TeO₄(OH)₂)₂] (M(III) = Cu, Ag, Au) and $K_{6} [{TeM}_{6}^{'} O_{24}]$ (M′(VI) = Cr, Mo, W). Their structures were characterized on the basis of spectroscopic, crystallographic, magnetic and thermal measurements. The deprotonation constants of telluric acid and the stability constants of the Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) complexes were determined by pH-metric measurements.
Phase transitions and vibrational study of (Cs<inf>3.5</inf>Rb <inf>0.5</inf>)[(Se<inf>0.85</inf>S<inf>0.15</inf>)O<inf>3</inf>] <inf>2</inf>[Te(OH)<inf>6</inf>]<inf>3</inf> material
2013, Journal of Molecular Structure
The ionic–protonic conductor (Cs_3.5Rb_0.5)[(Se_0.85S_0.15)O₃]₂[Te(OH)₆]₃ crystallizes in the orthorhombic system. The space group is Pccn. Three endothermic peaks in thermal behavior were detected for this compound at T₁ = 400 K, T₂ = 435 K and T₃ = 480 K, by DSC experiment. These transitions analyzed by dielectric measurements using the impedance and modulus spectroscopy techniques. Raman spectra of the material recorded at various temperatures (300–600 K) in the frequency range 100–1100 cm⁻¹ and IR spectra achieved at room temperature between 400 and 4000 cm⁻¹, confirm the presence of all the phase transitions detected in the material and show that anionic groups coexist independently in the same crystal.
Silylated calcium phosphates and their new behavior for copper retention from aqueous solution
2007, Colloids and Surfaces A: Physicochemical and Engineering Aspects
Anhydrous calcium phosphate (CaP) was modified by surface silylation using three organosilanes (H₃CO)₃SiR, where R corresponds to the organic moieties CH₂CH₂CH₂NH₂, CH₂CH₂CH₂NHCH₂CH₂NH₂ and CH₂CH₂CH₂NHCH₂CH₂NHCH₂CH₂NH₂, originating nanomaterials named CaPSil1, CaPSil2, and CaPSil3. The products were characterized by elemental analysis, infrared spectroscopy, X-ray diffraction, thermogravimetry and ³¹P and ¹³C NMR. The amounts of attached amino groups on surfaces were 0.32 ± 0.05, 0.54 ± 0.04, and 1.21 ± 0.04 mmol g⁻¹ for CaPSilx (x = 1–3), respectively. Suspended silanized phosphates adsorbed copper cations from aqueous solution at liquid/solid interface.
Hydroxyapatite organofunctionalized with silylating agents to heavy cation removal
2006, Journal of Colloid and Interface Science
Hydroxyapatite surface silylation with organosilane derivatives (H₃CO)₃SiR, R being the corresponding organic moieties CH₂CH₂CH₂NH₂, CH₂CH₂CH₂NHCH₂CH₂NH₂, and CH₂CH₂CH₂NHCH₂CH₂NHCH₂CH₂NH₂, was carried out to yield organofunctionalized nanomaterials, named HApR1, HApR2, and HApR3, respectively. The products were characterized by elemental analysis, infrared spectroscopy, X-ray diffraction, thermogravimetry, and ³¹P and ¹³C NMR in the solid state. The amounts of groups grafted onto surfaces were $0.75 \pm 0.05$ , $2.35 \pm 0.14$ , and $2.48 \pm 0.18 mmol g^{−1}$ for HApRx ( $x = 1, 2, 3$ ) surfaces, respectively. Linear correlations between elemental analysis, mass loss, ³¹P chemical shift data, and the characteristics of the chain of each alkoxysilane were observed. The organic basic centers distributed onto the external surface have the ability to adsorb divalent copper and cobalt cations from aqueous solution. The degree of adsorption obtained from batchwise processes showed the best performance of these synthesized nanomaterials when compared with the pristine hydroxyapatite.

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Vibrational spectra of cesium tellurate phosphate

Abstract

Infrared Phys.

Mat. Res. Bull.

Mat. Res. Bull.

Spectrochim. Acta