Highly Ordered Hierarchically Macroporous MIL-125 with High Specific Surface Area for Photocatalytic CO<sub>2</sub> Fixation

Wu, Shaohang; Xing, Xiaofei; Wang, Dan; Zhang, Jianzheng; Chu, Junmei; Yu, Chengcheng; Wei, Zhiting; Hu, Mingliang; Zhang, Xin; Li, Zhenxing

doi:10.1021/acssuschemeng.9b04829

Cited by 71 publications

(32 citation statements)

References 39 publications

(44 reference statements)

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“…3). In addition, the high specific surface area of the composite (45.74 m 2 g -1 ), element polyvalence and the higher adsorption oxygen content could also lead to the improvement of photocatalytic performance [36,37].…”

Section: Xps Analysismentioning

confidence: 99%

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

et al. 2021

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In this study, a solar-driven photocatalyst La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%) with pn heterojunction structure was synthesized and characterized. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7-Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%) were also investigated. Results show that p-n heterojunction was formed, and it has considerable photocatalytic properties under ultraviolet light and solar irradiation. More importantly, La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%) also exhibits Fenton-like catalytic performance in the presence of H 2 O 2 and oxalic acid (OA). The main reactive radicals of the La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 -H 2 O 2 -OA-sunlight system are h ? , Á OH and Á O 2 -. The chemical oxygen demand removal rate of MO wastewater in La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%)-H 2 O 2 -oxalic acid-sunlight system reached 72.4%; the value was higher than that of the sum of single photocatalysis (34.5%) and Fenton-like-dark system (27.6%), indicating that there is a synergistic effect between the photocatalysis and Fenton-like on MO degradation. In addition, La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%) displays approximately superparamagnetism and has higher saturated magnetization (M s ), low coercive force and residual magnetism. So it can be easily recovered by an external magnetic field and can be reused 6 times. It was anticipated that La 0.7 Sr 0.3 MnO 3 /a-Fe 2 O 3 (20%) with p-n heterojunction structure is a stable and reusable solar-light-driven magnetic photocatalyst and has great potential applications for wastewater treatment.

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Section: Xps Analysismentioning

confidence: 99%

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

et al. 2021

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“…240 nm, Figure 2E), which may be attributed to modest shrinkage of template during crystallization. 36 Unlike om-NENU-3a, cm-NENU-3a grows into an irregular morphology (Figure S9B), although the precursor concentration in the PS template interstices is essentially the same as that in the synthesis of cm-NENU-3a. The difference is the introduction of the PS template and HCOONa for preparing the om-NENU-3a.…”

Section: Resultsmentioning

confidence: 95%

“…180 nm) of om -NENU-3a is slightly smaller than the diameter of the PS sphere ( ca . 240 nm, Figure E), which may be attributed to modest shrinkage of template during crystallization …”

Section: Resultsmentioning

confidence: 99%

Hierarchically Ordered Macro–Microporous Polyoxometalate-Based Metal–Organic Framework Single Crystals

et al. 2021

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Facile construction of ordered macroporous polyoxometalate-based metal–organic frameworks (POM@MOFs) to break the intrinsic microporous restriction is significant but remains challenging. On one hand, the POMs introduced improve the structural stability and modify the pores of MOFs, e.g., introducing functional catalytic and adsorptive units. Meanwhile, the acidic POMs severely affect the nucleation and growth of the POM@MOFs, resulting in complicated synthesis and difficult assembly control. Herein, a general approach has been developed to fabricate ordered macroporous POM@MOF single crystals, involving close-packed polystyrene (PS) nanosphere templates. The artificially selected polar solvents exerting strong solvent effect with POMs weaken the affinity between POMs and metal ions, thereby effectively stabilizing the precursors from assembly before filling into the PS template interstices. The weak alkaline carboxylate used regulates the in situ nucleation and growth of POM@MOFs through deprotonation of the ligands as well as coordinating modulation, affording a series of hierarchically cuboctahedral POM@MOF single crystals with ordered macropores (ca. 180 nm) and intrinsic micropores after template removal. The ordered macroporous structure and thinned microporous skeleton markedly improve mass diffusion properties, while the integral single-crystal lattice retains superior stability.

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“…[13] Li et al reported highly ordered hierarchically microporous MIL-125 with high specific surface area was used as the photocatalyst for atmospheric chemical fixation of CO 2 through CO 2 carbonylative coupling reactions under ultraviolet irradiation. [14] At present, the mainstream pore size regulation methods can be roughly divided into the following ways: in-situ synthesis, postsynthesis modification, interpenetrating regulation, auxiliary synthesis, and competitive ligand regulation. Among them, the first two strategies are most widely used.…”

Section: Regulation Of Pore Sizementioning

confidence: 99%

Nanospace Engineering of Metal‐Organic Frameworks for Heterogeneous Catalysis

Wang

Yang

et al. 2021

ChemNanoMat

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The structural advantages of metal-organic frameworks (MOFs) can facilitate wide applications in the field of catalysis, including oxidation, hydrogenation, acetalization, transesterification, catalytic cracking, and so on. The efficiency of catalysis is closely related to the synergy between active center, auxiliary center, and microenvironment. Researchers can customize MOFs according to the needs of catalytic reactions, and many strategies were established for boosting catalytic performance. In this review, we aim to summarize and illustrate recent progress in the nanospace engineering of MOFs. Generally, MOFs were engineered mainly from the following aspects: 1) Regulation of pore size, including micropores, mesopores, and macropores. 2) Engineering of encapsulated active species, such as metal nanoparticles, quantum dots, polyoxometalates, enzymes, etc. 3) Engineering of MOFs morphology from zero dimension to three-dimension. 4) Controllable integration of MOFs with multi-strategies. 5) Construction of multivariate MOFs via introducing multiple or mixed organic functional groups into the existing framework. Besides, for further low cost and practical applications, challenges for MOFs as green and sustainable catalysts are also discussed.

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Highly Ordered Hierarchically Macroporous MIL-125 with High Specific Surface Area for Photocatalytic CO₂ Fixation

Cited by 71 publications

References 39 publications

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

Hierarchically Ordered Macro–Microporous Polyoxometalate-Based Metal–Organic Framework Single Crystals

Nanospace Engineering of Metal‐Organic Frameworks for Heterogeneous Catalysis

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Highly Ordered Hierarchically Macroporous MIL-125 with High Specific Surface Area for Photocatalytic CO2 Fixation

Cited by 71 publications

References 39 publications

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

Hierarchically Ordered Macro–Microporous Polyoxometalate-Based Metal–Organic Framework Single Crystals

Nanospace Engineering of Metal‐Organic Frameworks for Heterogeneous Catalysis

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Highly Ordered Hierarchically Macroporous MIL-125 with High Specific Surface Area for Photocatalytic CO₂ Fixation