Pt Modified TiO2–x/C Composites with Metal‐organic Frameworks as Precursors for Photodegradation of Organic Dye

Xu, Qing; Fan, Dong; He, Bingbing

doi:10.1002/zaac.201900255

Cited by 2 publications

(1 citation statement)

References 51 publications

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“…Recent works show that metal-organic frameworks (MOFs) are emerging as one of the most promising materials [10] in various applications such as chemical sensors, [11] cancer therapy, [12] gas separation [13][14][15] and dye removal/degradation catalysts. [16,17] As reported, UiO-66 crystal has 6 coordinated Zr atoms sitting at the vertices of octahedron and bonding with 4 μ3-OH and 4 μ3-O to form Zr 6 O 4 (OH) 4 cluster. Such cluster is bonded by 12 benzen-1,4-dicarboxlate (BDC) to its 12 nearest Zr 6 cluster neighbours.…”

Section: Introductionmentioning

confidence: 81%

Modulation synthesis of UiO‐66 and its outstanding adsorption properties towards low‐concentration methylene blue

Mao

Liu

et al. 2021

Zeitschrift anorg allge chemie

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To improve UiO-66's adsorption capacity towards methylene blue (MB) of low concentrations, an efficient modulator, butyric acid, has been successfully employed to regulate its defect levels using a modulation method. The butyric acid regulated UiO-66 has higher degree (6.08 %) of defects, larger mass loss (8.63 %) from 248 to 440°C, lower BDC 2À /Zr molar ratios (0.86) and higher specific surface area (1186 m 2 /g) than those (5.86 %, 6.98 %, 0.90, and 1024 m 2 /g, respectively) of the most studied acetic acid modulated one. Furthermore, its SEM images also show the near-spherical shapes and the formation of many wrinkles/grooves on the outer rough surfaces. Hence when the concentration of MB is as low as 40 mg/L, it can still reach a higher adsorption capacity (143 mg/g) than the mostly studied acetic acid modulated one. The saturated adsorption capacity of UiO-66 (Butyric acid) almost reaches 765 mg/g, much better than other adsorption materials. In comparison, the acetic acid regulated one shows slightly lower specific surface areas, less defective structures, smoother surface and more polyhedral shapes. It thus reaches a smaller adsorption capacity of about 97 mg/g despite in a rather short time (~5 min). The underlying mechanism for the above different adsorption behaviors is also addressed. Overall, it is suggest that the butyric acid can significantly change the defect levels in UiO-66 and thus improve its MB adsorption uptake.

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Section: Introductionmentioning

confidence: 81%

Modulation synthesis of UiO‐66 and its outstanding adsorption properties towards low‐concentration methylene blue

Mao

Liu

et al. 2021

Zeitschrift anorg allge chemie

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Preparation of Cobalt and Nitrogen‐Doped Porous Carbon Composite Catalysts From ZIF‐9 and Their Outstanding Fenton‐like Catalytic Properties Towards Methylene Blue

Liu

et al. 2023

ChemistrySelect

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To activate peroxymonosulfate (PMS) and degrade methylene blue (MB), cobalt and nitrogen‐doped porous carbon composite catalysts were prepared through pyrolysing zeolitic imidazolate framework ZIF‐9 and dicyandiamide (DCDA) at 700–900 °C with various mass ratios. Powder X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer‐Emmett‐Teller results showed that Co, porous carbon and carbon nanotubes (CNTs) co‐existed in the catalyst prepared at 800 °C with a ZIF‐9/DCDA ratio of 1 : 3. Thermogravimetric analysis suggested that CNT@ZIF‐800 had a higher ratio of graphitic to turbostratic carbon than CNT@ZIF‐700. It had degraded 94.8 % MB within 30 min, which was about 1.9 times faster than its counterpart C‐ZIF‐800. It also showed faster degradation rates towards Congo red (98.5 %, 5 min) and slower rates towards rhodamine B (90.7 %, 30 min) than MB. Furthermore, XPS revealed that it had 14.5 % more Co−Nx/pyridinic‐N active sites than C‐ZIF‐800. EPR suggested that 1O2 might be the primary catalytic species whereas the SO4−⋅ and ⋅OH the secondary ones. The formation mechanism of such active species might be originated from the synergistic activation of PMS by CNTs, Co−Nx/pyridinic‐N and abundant Co sites in the CNT@ZIF‐800. This work not only provided efficient Fenton‐like catalysts for MB degradation, but also clarified the catalytic mechanism.

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Pt Modified TiO₂_–_x/C Composites with Metal‐organic Frameworks as Precursors for Photodegradation of Organic Dye

Cited by 2 publications

References 51 publications

Modulation synthesis of UiO‐66 and its outstanding adsorption properties towards low‐concentration methylene blue

Modulation synthesis of UiO‐66 and its outstanding adsorption properties towards low‐concentration methylene blue

Preparation of Cobalt and Nitrogen‐Doped Porous Carbon Composite Catalysts From ZIF‐9 and Their Outstanding Fenton‐like Catalytic Properties Towards Methylene Blue

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