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Preparation method and applications of nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst

A nano-titanium dioxide and composite catalyst technology, which is applied in the field of environmental pollution control, can solve the problems of low solar energy utilization rate of photocatalysts, complicated preparation and high electron-hole recombination rate, and achieves easy control of preparation parameters, broad application prospects and process cycle. short effect

Inactive Publication Date: 2019-02-01
NANJING UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problems of low utilization rate of solar energy, high electron-hole recombination rate and cumbersome preparation of photocatalysts in the prior art, and provides a nano-titanium dioxide@iron-based MOF visible light composite catalyst {TiO 2 @NH 2 The preparation method of -MIL(Fe)}, and its application to the efficient conversion of sunlight irradiation under mild neutral conditions to remove Cr(VI) in the aqueous phase

Method used

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  • Preparation method and applications of nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst
  • Preparation method and applications of nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst
  • Preparation method and applications of nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst

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Embodiment 1

[0036](1) Take 0.017g TiO 2 (P25), 0.27g ferric chloride hexahydrate (FeCl 3 .6H 2 O) and 0.18g of 2-aminoterephthalic acid were dissolved in 20mL of N,N-dimethylformamide, ultrasonically dispersed; transferred to a polytetrafluoroethylene-lined autoclave, reacted at 110°C for 12h, and centrifuged , washing, suction filtration, and vacuum drying at 70°C for 8 hours to obtain TiO 2 @NH 2 - MIL-88B(Fe)(TM-b) photocatalyst. In this catalyst, the molar ratio of titanium dioxide to iron-based MOF is 10%.

[0037] (2) Prepare a 0.2 mmol / L Cr(VI) solution at room temperature, take 40 mL of the solution in a 50 mL photoreaction tube, add 20 mg of the photocatalyst obtained in (1), and 3 mg of small molecular organics.

[0038] (3) Adjust the pH of the solution to 7, fully stir for 40 minutes under dark conditions, irradiate with a 500W xenon lamp, take samples at intervals, and measure the residual Cr(VI) concentration by the national standard method.

[0039] TiO is obtained in...

Embodiment 2

[0046] The difference between this embodiment and Example 1 is that the TiO described in step (1) 2 The addition amount of (P25) is 0.0085g, other is identical with embodiment 1, obtains photocatalyst (TM-a). See the experimental results figure 2 , depicts the time-dependent trend of the ratio of the Cr(VI) concentration to the initial Cr(VI) concentration during the reaction.

[0047] In the photocatalyst (TM-a), the molar ratio of titanium dioxide to iron-based MOF is 5%.

Embodiment 3

[0049] The difference between this embodiment and Example 1 is that TiO in step (1) 2 (P25) was added in an amount of 0.0255 g, and the others were the same as in Example 1 to obtain a photocatalyst (TM-c). See the experimental results figure 2 , depicts the time-dependent trend of the ratio of the Cr(VI) concentration to the initial Cr(VI) concentration during the reaction. In the photocatalyst (TM-c), the molar ratio of titanium dioxide to iron-based MOF is 15%.

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Abstract

The invention belongs to the field of environment pollution treatment, and more specifically relates to a preparation method and applications of a nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst. The preparation method comprises following steps: a ferric iron salt, 2-amino terephthalic acid, and nanometer TiO2 are added into N, N-dimethyl formamide, ultrasonic uniform dispersion treatment is carried out so as to obtain a precursor solution; the precursor solution is subjected to hydro-thermal reaction so as to obtain the nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst. Under sun light effect, the nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst is capable of realizing high efficiency reduction of Cr(VI) under mild neutral conditions, efficiency is high, energy consumption is low, and the nanometer titanium dioxide @ Fe-based MOF visible light composite catalyst is widely suitable for processing of a plurality of chromium containing waste water.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and specifically relates to a preparation method and application of a nano-titanium dioxide@iron-based MOF visible light composite catalyst. Background technique [0002] Traditional fossil energy is non-renewable, and a series of environmental problems will arise in the process of utilization. Therefore, it is of great significance to develop the national economy and achieve sustainable development to find alternative energy sources that will not cause harm to the environment. Solar energy is a clean and renewable energy source, and using solar energy to degrade and transform environmental pollutants is an effective method. Photocatalytic technology converts solar energy into chemical energy. It has the characteristics of low cost, green environmental protection, and no secondary pollution. . [0003] Cr(VI) wastewater comes from a wide range of sources, and industrial fields su...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/38C02F1/30C02F101/22
CPCC02F1/30B01J31/2217B01J31/40C02F2305/10C02F2101/22B01J35/39
Inventor 刘福强袁冉冉岳彩良江昊邱金丽程松张艳红朱长青李爱民
Owner NANJING UNIV
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