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. 2021 Sep 6;11(9):2314.
doi: 10.3390/nano11092314.

Study on Adsorption Behavior of Nickel Ions Using Silica-Based Sandwich Layered Zirconium-Titanium Phosphate Prepared by Layer-by-Layer Grafting Method

Chunmin Li  1 , Jinsheng Zhao  1 , Yusheng Zhang  2
Affiliations

Study on Adsorption Behavior of Nickel Ions Using Silica-Based Sandwich Layered Zirconium-Titanium Phosphate Prepared by Layer-by-Layer Grafting Method

Chunmin Li et al. Nanomaterials (Basel). .

Abstract

In this study, the composite of silica-based sandwich-layered zirconium-titanium phosphate was prepared by a layer-by-layer grafting method and its adsorption properties in a diluted solution of Ni ions were specifically researched by the bath experiment method. The field-emission scanning electron microscope (FESEM) results presented the smooth surface morphology of the pristine adsorbent and a rough surface morphology of the adsorbed adsorbent and the energy dispersive analysis (EDS) results ensured the presence of the original metal element (Si, O, Ti, P, Zr) and the captured nickel element on the adsorbent. The Fourier transformed infrared spectroscopy (FTIR) revealed the new band formation of -Si-Ti-O-, -Si-Ti-O-P-, and -Si-Ti-O-P-Zr-O-, which ensured the successful modification of the silica substrate by zirconium-titanium phosphate. The specific surface area and pore size distribution analysis indicated that the pore structure was changed from type-Ⅳ to H2-type and the specific surface area (BET) of the modified composite was 337.881 m2/g. In the bath experiment, the optimal pH for adsorbing Ni ions on the composite was ~8 with the equilibrium time 30 min at room temperature and the maximum sorption amount was 50.1 mg/g. The adsorption kinetics of the sorption process were corresponded to the pseudo-second-order kinetic equation and the isothermal adsorption data were fitted well to the Redlich-Peterson Model. Thermodynamic simulation results revealed the species of Ni ions and provided a reasonable pH scope for better removal of the Ni element in wastewater.

Keywords: Ni adsorption; silica substrate; thermodynamic simulations; zirconium-titanium phosphate.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 11
Figure 11
Leachability of Sr from sintered adsorbed Si-Ti-P-Zr adsorbent.
Figure 1
Figure 1
Synthesis process of the adsorbent.
Figure 2
Figure 2
TEM micrograph of (a) the SBA-15 and (a-1) magnified image of SBA-15, (b) cross-section image of SiO2-Ti-P-Zr adsorbent, (b-1) magnified image of cross-section image, (c) the SiO2-Ti-P-Zr adsorbent, and (c-1) the magnified image of SiO2-Ti-P-Zr adsorbent.
Figure 3
Figure 3
The (a) FT-IR and (b) XRD analysis of the formation process of the adsorbent (SBA-15, Si-Ti, Si-Ti-P, and Si-Ti-P-Zr).
Figure 4
Figure 4
The nitrogen adsorption-desorption isotherm and the pore volume distribution of the samples: (a) SBA-15, (b) Si-Ti, (c) Si-Ti-P, (d) Si-Ti-P-Zr.
Figure 5
Figure 5
(a) SEM images of the pristine adsorbent and (b) adsorbed adsorbent.
Figure 6
Figure 6
SEM images and EDS element-mappings of (a) the pristine adsorbent, (a-1) Si element distribution, (a-2) O element distribution, (a-3) Ti element distribution, (a-4) P element distribution, (a-5) Zr element distribution and (b) the adsorbed adsorbent, (b-1) Si element distribution, (b-2) O element distribution, (b-3) Ti element distribution, (b-4) P element distribution, (b-5) Zr element distribution, (b-6) Ni element distribution.
Figure 7
Figure 7
The atom percent of the elements (a) O, P, Si, Ti, Zr and (b) Si, O, Ti, P, Ni, Zr.
Figure 8
Figure 8
The results of the thermodynamic simulations of the hydrolyzed species of Ni ions in the pH range from 1 to 14.
Figure 9
Figure 9
The bath experiment results. (a) The influence of the initial concentration on the adsorption of Ni ions; (b) The effect of pH on the adsorption of Ni ions; (c) The influence of the contact time on the adsorption of Ni ions; (d) The selective adsorption property of Ni from the multi-component aqueoussolution by the adsorbent.
Figure 10
Figure 10
The nonlinear fitting results by Langmuir, Freundlich, and Redlich-Peterson isotherms sorption models.
See this image and copyright information in PMC

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