The effect of phosphonates on lanthanide separation for surface-grafted porous zirconia

Otaki, Miho; Suominen, Topi; Suorsa, Valtteri; Hietala, Sami; Koivula, Risto

doi:10.1039/d2ma00928e

Cited by 5 publications

(2 citation statements)

References 54 publications

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“…The weak band observed at 1140 cm –1 corresponds to the P–O asymmetrical stretching vibrations from the RPO 2 (OH) groups. The strong absorption band at 1048 cm –1 is due to PO 3 . The appearance of a sharp band at 1010 cm –1 is attributed to the stretching vibration of P–O–Zr, providing compelling evidence for the successful formation of the zirconium phosphonate structure .…”

Section: Resultsmentioning

confidence: 91%

“…The strong absorption band at 1048 cm −1 is due to PO 3 . 32 The appearance of a sharp band at 1010 cm −1 is attributed to the stretching vibration of P−O−Zr, providing compelling evidence for the successful formation of the zirconium phosphonate structure. 33 Peaks at 820 and 580 cm −1 are attributed to the framework vibration of Zr−O−P and Zr−O bonds.…”

Section: Characterization Of Go-zratmp Compositementioning

confidence: 96%

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Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Patel,

Lanakapati,

Maheria

2024

ACS Appl. Eng. Mater.

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The contamination of water by heavy metals poses a significant threat to both the environment and public health, and hence, the effective purification of contaminated water remains a formidable challenge. Recently, graphene oxide (GO) has shown significant potential for removing heavy metals due to its large surface area, availability of functional groups, and high adsorption affinity. However, it is associated with several disadvantages such as aggregation, reduced surface area, and pH sensitivity. To overcome such drawbacks, the surface of GO has been modified with zirconium and amino trimethylene phosphonic acid (ATMP), forming the GO-ZrATMP composite. The newly synthesized hybrid GO-ZrATMP composite has been well characterized by several characterization techniques such as Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy with energydispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), etc. This composite has been employed for the adsorption of Pb 2+ , Cd 2+ , and Hg 2+ from aqueous solution. Adsorption isotherm and kinetics results showed that the adsorption of Pb 2+ , Cd 2+ , and Hg 2+ on GO-ZrATMP was a monolayer adsorption process and dominated by physisorption and intraparticle diffusion. Thermodynamic studies revealed that the sorption process is endothermic, spontaneous, and feasible. The maximum adsorption capacity was found to be 373, 320, and 281 mg/g for Pb 2+ , Cd 2+ , and Hg 2+ , respectively. Further, a study pertaining to distribution studies (in aqueous and various electrolyte media) and metal separations has been conducted. Based on these studies, efficient binary and ternary metal separations have been achieved using GO-ZrATMP composite material. The present study clearly demonstrates the potential of GO-ZrATMP composite in eliminating heavy metals from both water and real wastewater.

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Section: Resultsmentioning

confidence: 91%

Section: Characterization Of Go-zratmp Compositementioning

confidence: 96%

Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Patel,

Lanakapati,

Maheria

2024

ACS Appl. Eng. Mater.

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Terbium- and samarium-doped Li2ZrO3 perovskite materials as efficient and stable electrocatalysts for alkaline hydrogen evolution reactions

Monama,

Ramoroka,

Ramohlola

et al. 2024

Environ Sci Pollut Res

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The preparation of highly active, rare earth, non-platinum-based catalysts for hydrogen evolution reactions (HER) in alkaline solutions would be useful in realizing green hydrogen production technology. Perovskite oxides are generally regarded as low-active HER catalysts, owing to their unsuitable hydrogen adsorption and water dissociation. In this article, we report on the synthesis of Li2ZrO3 perovskites substituted with samarium and terbium cations at A-sites for the HER. LSmZrO3 (LSmZO) and LTbZrO3 (LTbZO) perovskite oxides are more affordable materials, starting materials in abundance, environmentally friendly due to reduced usage of precious metal and moreover have potential for several sustainable synthesis methods compared to commercial Pt/C. The surface and elemental composition of the prepared materials have been confirmed by X-ray photoelectron spectroscopy (XPS). The morphology and composition analyses of the LSmZO and LTbZO catalysts showed spherical and regular particles, respectively. The electrochemical measurements were used to study the catalytic performance of the prepared catalyst for hydrogen evolution reactions in an alkaline solution. LTbZO generated 2.52 mmol/g/h hydrogen, whereas LSmZO produced 3.34 mmol/g/h hydrogen using chronoamperometry. This was supported by the fact that the HER electrocatalysts exhibited a Tafel slope of less than 120 mV/dec in a 1.0 M alkaline solution. A current density of 10 mA/cm2 is achieved at a potential of less than 505 mV. The hydrogen production rate of LTbZO was only 58.55%, whereas LSmZO had a higher Faradaic efficiency of 97.65%. The EIS results demonstrated that HER was highly beneficial to both electrocatalysts due to the relatively small charge transfer resistance and higher capacitance values.

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Intra-lanthanide separation performance of DOTP: Solid-phase extraction and selective precipitation studies

Otaki,

Suominen,

Hietala

et al. 2025

Separation and Purification Technology

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The effect of phosphonates on lanthanide separation for surface-grafted porous zirconia

Abstract: Inorganic–organic hybrid sorbents were synthesized by grafting porous zirconia with a series of aminomethylenephosphonate ligands. Sorbents with a larger number of phosphonate groups showed higher selectivity for intra-lanthanide separation.

Cited by 5 publications

References 54 publications

Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Terbium- and samarium-doped Li2ZrO3 perovskite materials as efficient and stable electrocatalysts for alkaline hydrogen evolution reactions

Intra-lanthanide separation performance of DOTP: Solid-phase extraction and selective precipitation studies

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The effect of phosphonates on lanthanide separation for surface-grafted porous zirconia

Abstract: Inorganic–organic hybrid sorbents were synthesized by grafting porous zirconia with a series of aminomethylenephosphonate ligands. Sorbents with a larger number of phosphonate groups showed higher selectivity for intra-lanthanide separation.

Cited by 5 publications

References 54 publications

Efficient Removal of Pb2+, Cd2+, and Hg2+ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Efficient Removal of Pb2+, Cd2+, and Hg2+ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Terbium- and samarium-doped Li2ZrO3 perovskite materials as efficient and stable electrocatalysts for alkaline hydrogen evolution reactions

Intra-lanthanide separation performance of DOTP: Solid-phase extraction and selective precipitation studies

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Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite

Efficient Removal of Pb²⁺, Cd²⁺, and Hg²⁺ from Wastewater Using Advanced Graphene Oxide-Zirconium Hybrid Composite