Synthesis of MgAl-LDH@ZIF-8 composites by <i>in situ</i> growth method for highly efficient phosphate removal

Zhang, Jilin; Liu, Guixia; Dai, Zi; Lei, Yunyun; Zhao, Xia; Liu, Xiaoxun

doi:10.1039/d2nj03584g

Cited by 8 publications

(7 citation statements)

References 60 publications

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“…2d) shows five distinct peaks corresponding to lattice oxygen (M–O–M) (M = Mg or Al), low coordination oxygen, hydroxyl groups (M–OH), C–OH, and CO 3 2− , respectively. 36,37 Karst-LDH has a higher proportion of low coordination oxygen (27.74%) than that of G-LDH (19.64%) and Rock-LDH (24.06%), suggesting more storage and transfer of active oxides in Karst-LDH. 38 The Mg 1s spectrum (Fig.…”

Section: Resultsmentioning

confidence: 95%

A karst-inspired hierarchical Mg/Al layered double hydroxide with a high entropy-driven process for interception and storage

Shi,

Qin,

et al. 2024

Dalton Trans.

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Section: Resultsmentioning

confidence: 95%

A karst-inspired hierarchical Mg/Al layered double hydroxide with a high entropy-driven process for interception and storage

Shi,

Qin,

et al. 2024

Dalton Trans.

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“…For the −OH absorption peak, the wavenumber varied from 3425 to 3375 cm –1 after adsorption, significantly shifting toward the lower wavenumbers, indicating enhanced hydrogen bonding. It is indicated that the phosphate exchanged ligands with the −OH group on ZIF-8-PhIm …”

Section: Resultsmentioning

confidence: 99%

“…It is indicated that the phosphate exchanged ligands with the −OH group on ZIF-8-PhIm. 51 In summary, the mechanism of phosphate adsorption can be summarized in two key interactions: (1) Zn−O−P bonding and (2) electrostatic attraction of the negative phosphate ion to the positive ZIF-8-PhIm surface. The increase in pore size and pore capacity of ZIF-8-PhIm increased hydrophilicity and exposed more active sites for adsorption (Figure 11).…”

Section: Isotherms and Thermodynamicsmentioning

confidence: 99%

Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Zhao

Yuan

et al. 2023

ACS Omega

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Due to rapid socioeconomic development, increased phosphorus concentrations can cause eutrophication of water bodies, with devastating effects on environmental sustainability and aquatic ecosystems. In this study, ZIF-8-PhIm was prepared for phosphorus removal using 2-phenylimidazole via the solvent-assisted ligand exchange (SALE) method. The structure and composition of ZIF-8-PhIm were characterized by various methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and Brunauer−Emmett−Teller (BET) analysis. Compared to the ZIF-8 material, it exhibited a multistage pore structure with larger pore capacity and pore size, increased hydrophilicity, exposure of more adsorption sites, and also stronger electrostatic interaction. Under optimized conditions (T = 298 K, C 0 = 150 mg/L, dose = 0.2 g/ L), the adsorption capacity of ZIF-8-PhIm reached 162.93 mg/g, which was greater than that of the ZIF-8 material (92.07 mg/g). The Langmuir isotherm and pseudo-second-order kinetic models were suitable for describing the phosphate adsorption of ZIF-8-PhIm. The main effects of ZIF-8-PhIm on phosphate adsorption were Zn−O−P bonding and electrostatic interactions. It also had good regeneration properties. The ZIF-8-PhIm/CS spheres were prepared using chitosan (CS) as the cross-linking agent. The results of dynamic adsorption experiments on the spheres showed a saturation capacity of 85.69 mg/g and a half-penetration time of 514.15 min at 318 K according to the fitted results.

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“…NH 2 -MIL-101 has a higher adsorption capacity than MIL-101, which may result from the amine functional groups that can interact with phosphate ions, and the different mechanisms were discussed in Figure b. In a recent study by Dai et al, MgAl-LDH@ZIF-8 composites were prepared by in situ growth of zeolite imidazole framework-8 (ZIF-8) on MgAl-LDH for phosphate removal in wastewater . Compared with pure ZIF-8 and MgAl-LDH, the prepared LDH/MOF composite has a higher phosphate removal efficiency of up to 99%.…”

Section: Progress Of Ldhs In Phosphate Removal and Recyclingmentioning

confidence: 99%

Layered Double Hydroxides for Regulating Phosphate in Water to Achieve Long-Term Nutritional Management

et al. 2023

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Hunger and undernourishment are increasing global challenges as the world’s population continuously grows. Consequently, boosting productivity must be implemented to reach the global population’s food demand and avoid deforestation. The current promising agricultural practice without herbicides and pesticides is fertilizer management, particularly that of phosphorus fertilizers. Layered double hydroxides (LDHs) have recently emerged as favorable materials in phosphate removal, with practical application possibilities in nanofertilizers. This review discusses the fundamental aspects of phosphate removal/recycling mechanisms and highlights the current endeavors on the development of phosphate-selective sorbents using LDH-based materials. Specific emphasis is provided on the progress in designing LDHs as the slow release of phosphate fertilizers reveals their relevance in making agro-practices more ecologically sound. Relevant pioneering efforts have been briefly reviewed, along with a discussion of perspectives on the potential of LDHs as green nanomaterials to improve food productivity with low eco-impacts.

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Synthesis of MgAl-LDH@ZIF-8 composites by in situ growth method for highly efficient phosphate removal

Abstract: Removal of phosphate from wastewater by adsorption has become one of the effective ways to mitigate the negative effects of eutrophication in water bodies, and efficient adsorbent is the key....

Cited by 8 publications

References 60 publications

A karst-inspired hierarchical Mg/Al layered double hydroxide with a high entropy-driven process for interception and storage

A karst-inspired hierarchical Mg/Al layered double hydroxide with a high entropy-driven process for interception and storage

Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Layered Double Hydroxides for Regulating Phosphate in Water to Achieve Long-Term Nutritional Management

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