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Zeolite Fenton catalyst containing isolated metal species as well as preparation method and application thereof

A catalyst and metal technology, applied in the field of catalyst preparation for wastewater treatment, can solve the problems of complex preparation method and low content of isolated metal species, etc.

Inactive Publication Date: 2016-06-01
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of zeolite catalysts containing isolated metal species is relatively complicated and the content of isolated metal species in zeolite catalysts is very small (<0.50%, mass ratio), therefore, the development of a simple preparation method containing high-concentration isolated metal species zeolite catalysts is of great significance
In addition, zeolite catalysts containing isolated metal species are basically based on the reduction reaction of nitrogen oxides, and there is no literature on its application in Fenton catalysis.

Method used

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  • Zeolite Fenton catalyst containing isolated metal species as well as preparation method and application thereof
  • Zeolite Fenton catalyst containing isolated metal species as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of catalyst precursor. 10g4A zeolite and 2000mg / LFeCl 3 The solutions were mixed according to the mass ratio of 1:50, shaken in an air bath shaker for 3 hours, and then vacuum-filtered to collect the obtained solid as the catalyst precursor.

[0022] (2) Preparation of catalyst. After the catalyst precursor was frozen in the refrigerator for 0.5h, it was placed in a freeze dryer and frozen at -55°C for 48h to prepare a 4A zeolite Fenton catalyst containing isolated iron species.

[0023] The solid ultraviolet-visible diffuse reflectance spectrogram of the 4A zeolite Fenton catalyst containing isolated iron species is as attached figure 1 As shown, the 4A zeolite Fenton catalyst containing the isolated iron species has a sharp absorption peak at 209nm, while the absorption of the comparative catalyst is very weak at this place; The absorption intensity of the catalyst is less than that of the comparative catalyst. These phenomena indicate that in the 4...

Embodiment 2

[0026] (1) Preparation of catalyst precursor. 5g4A zeolite and 2000mg / LFeCl 3 The solutions were mixed according to the ratio of 1:5 (mass ratio), and after being shaken in an air bath shaker for 2 hours, they were vacuum-filtered, and the obtained solid was collected as the catalyst precursor.

[0027] (2) Preparation of catalyst. After the catalyst precursor was frozen in the refrigerator for 0.5 h, it was placed in a freeze dryer and frozen at -55 °C for 34 h to prepare a 4A zeolite Fenton catalyst containing isolated iron species.

[0028] When the pH value of the phenol solution was adjusted to 4.00, the 4A zeolite Fenton catalyst containing the isolated iron species of the present invention and the catalyst of the comparative example, the time required to degrade 70% phenol was 8h and 10.3h respectively, and the utilization rate of hydrogen peroxide in the degradation process They are 12.00% and 8.37% respectively.

Embodiment 3

[0030] (1) Preparation of catalyst precursor. 10g4A zeolite and 200mg / LFeCl 3 The solution was mixed according to the ratio of 1:50, and after being shaken in an air bath shaker for 5 hours, it was vacuum filtered, and the obtained solid was collected as the catalyst precursor.

[0031] (2) Preparation of catalyst. The preparation method is the same as in Example 1.

[0032] When the pH of the phenol solution was adjusted to 6.30, about 61.69% of the phenol could be degraded after 12 hours of reaction for the isolated iron species-containing 4A zeolite Fenton catalyst of the present invention, while the comparative catalyst had no degradation of phenol.

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Abstract

The invention belongs to the technical field of wastewater treatment catalyst preparation and particularly relates to a zeolite Fenton catalyst containing an isolated metal species as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing zeolite with a metal chloride precursor solution to prepare a catalyst precursor; and then preparing the Fenton catalyst containing the isolated metal species with a freeze-drying method. According to the zeolite Fenton catalyst containing the isolated metal species prepared with the method, the tetra-coordinated isolated metal species content reaches up to 8.90%; in a process of degrading phenolic waste water, the catalyst has high phenol degradation catalysis efficiency and hydrogen peroxide utilization efficiency as well as low active species leakage amount; and the catalyst is simple in preparation process, low in device requirement and low in cost, can be produced on a large scale and is applied to an actual wastewater treatment process.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation for wastewater treatment, and in particular relates to a zeolite Fenton catalyst containing isolated metal species and a preparation method and application thereof. The catalyst is used for rapid advanced oxidation removal of organic matter in aqueous solution. While improving the degradation efficiency of organic matter, the catalyst also improves the utilization efficiency of hydrogen peroxide in the reaction process and reduces the leakage of active species. Background technique [0002] Biodegradable sewage poses a huge potential hazard to human life, health and safety as well as the ecosystem. Among all the methods for treating refractory biodegradable sewage, the Fenton method has received extensive attention in the process of refractory biodegradable sewage treatment because of its advantages of fast, efficient, simple operation, non-toxic effect on subsequent treatment, and en...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/14B01J29/46C02F1/72
Inventor 张玉忠张磊涛李泓
Owner TIANJIN POLYTECHNIC UNIV
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