A mesoporous composite molecular sieve loaded with ag-znfe 2 o 4 Composite photocatalyst and preparation method thereof
A composite molecular sieve and mesoporous technology, which is applied in the field of environmental pollution prevention and control, can solve the problems of research on the shape regulation of mesoporous composite molecular sieves, unreported reaction performance, and reduced photocatalyst activity, so as to improve hydrothermal stability , Improve activity and efficiency, reduce operating costs
Active Publication Date: 2020-09-11
HENAN INST OF SCI & TECH
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Problems solved by technology
So far, many researchers have synthesized many mesoporous materials with different morphologies, but there are few studies on the regulation of the morphology of mesoporous composite molecular sieves, and the influence of the morphology of mesoporous composite molecular sieves on the reaction performance No specific impact has been reported
[0004] In addition, although loading the catalyst on molecular sieves can improve its photocatalytic activity, in engineering applications, the photocatalyst powder in the suspension system needs to be separated and recovered by filtration after use. During the separation process, a considerable part of the photocatalyst is lost, and the recovered light Catalyst activity also decreased
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Embodiment 1
[0016] A Mesoporous Composite Molecular Sieve Supported Ag-ZnFe 2 o 4 The preparation method of composite photocatalyst comprises the following steps:
[0017] ①A. Add 1.77g of sodium hydroxide, 0.66g of sodium aluminate, 7.22g of tetrapropylammonium bromide, 71.76g of deionized water and 40.00g of silica sol into the reaction kettle, and heat the reaction at 170°C for 12 hours to obtain ZSM-5 zeolite microcrystalline emulsion;
[0018] B. Weigh 2.5 g of P123 and add it to 60 mL of 2 mol / L hydrochloric acid, then place it in a constant temperature water bath at 40°C, stir and dissolve for 4 h, add 4.5 g of TEOS and 5.12 g of ZSM-5 zeolite microcrystalline emulsion dropwise, and stir rapidly After 5 min, it was aged for 24 h in a static state, transferred to a crystallization kettle, and crystallized at 100 °C for 24 h; filtered, washed, dried at 80 °C for 12 h, and then calcined at 550 °C for 5 h to obtain columnar ZSM-5-SBA-15 mesoporous composite molecular sieve;
[0019...
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The invention provides a mesoporous composite molecular sieve loaded Ag-ZnFe with high photocatalytic activity and easy separation, recovery and reuse 2 o 4 Composite photocatalyst and preparation method thereof. The mesoporous composite molecular sieve prepared by the present invention supports Ag-ZnFe 2 o 4 The composite photocatalyst not only has an open pore structure, a suitable number of acid sites, and the dispersion of active components, but under the combined action of Zn ions and Fe ions, the morphology of the composite molecular sieve changes from columnar to sheet, shortening the pore size. length, and then the morphology and pore structure of the catalyst can be adjusted to improve the photocatalytic reaction activity and efficiency, and the hydrothermal stability of SBA‑15 can be improved by aluminum modification, and the Ag‑ZnFe 2 o 4 The composite effect improves the catalytic activity of Ag, and the magnetic technology can be used to separate and recover the photocatalyst, which simplifies the separation process and reduces the operating cost.
Description
technical field [0001] The invention belongs to the technical field of environmental pollution prevention and control, and in particular relates to a mesoporous composite molecular sieve loaded with Ag-ZnFe 2 o 4 Composite photocatalyst and preparation method thereof. Background technique [0002] The supported photocatalytic performance is closely related to the acidity, pore size and specific surface area of the catalyst. ZSM-5, Beta and L zeolites have a large number of B and L acid sites, and high thermal and hydrothermal stability, which can be used as ideal supports for photocatalytic reactions. However, the smaller pore structure of microporous zeolite limits the diffusion of macromolecular reactants, and mesoporous silica material has a higher specific surface area and regular pore structure, which is conducive to the diffusion ability of macromolecular reactants, so in It has potential application value in the catalytic conversion of macromolecular reactants, b...
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IPC IPC(8): B01J29/80
CPCB01J29/005B01J29/46B01J29/0333B01J2229/18B01J35/33B01J35/39
Inventor 李建民张楠谢兰芬荆树科杨萌
Owner HENAN INST OF SCI & TECH