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Palladium catalyst for processing chlorinated organics in water and method for preparing same

A technology of palladium catalyst and organic matter, which is applied in the field of catalysts combined with precious metals and its preparation, can solve problems such as undue consideration, adverse environmental effects, and large Pd content, and achieve high adsorption efficiency, good chlorine removal effect, and adsorption powerful effect

Inactive Publication Date: 2012-11-28
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many shortcomings in the existing electrochemical reduction dechlorination method, such as the low solubility of polychlorinated organic compounds in aqueous solution, so generally toxic aprotic organic solvents or toxic electrode materials with high hydrogen overpotential are used, and these materials are harmful to the environment. cause serious impact
[0010] Therefore, the following technical problems exist in the existing chlorinated organic matter treatment technology in water: (1) adopt the strong oxidizing property of a large amount of free radicals that advanced oxidation technology produces to treat the chlorinated organic matter in waste water, the chlorinated intermediate product that produces makes chlorine The toxicity of modern organic wastewater is still very high, (2) the use of toxic aprotic organic solvents or toxic electrode materials with high hydrogen overpotential has caused adverse effects on the environment, (3) the use of electrochemical dechlorination technology to dechlorinate organic matter (4) The content of Pd in ​​the catalyst is large and the price is expensive

Method used

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  • Palladium catalyst for processing chlorinated organics in water and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of pretreated carbon support

[0049] 1) Combine activated carbon powder with HNO 3 After the solution is mixed evenly, heat to 95°C, keep stirring and reflux at 95°C for 2 hours, then cool to room temperature (20°C) and filter, and wash the filter residue with distilled water until the washing liquid is neutral (that is, the effluent after washing is neutral). pH value is 7.0), wherein, HNO 3 The mass percent concentration of the solution is 10%, the particle size of the activated carbon powder is 30nm, and the activated carbon powder and HNO 3 The weight ratio of the solution is 1:5;

[0050] 2) drying the washed filter residue at 100° C. to a constant weight to obtain a pretreated carbon carrier.

[0051] The oxygen-containing groups on the surface of the pretreated carbon support were measured by Boehm titration. The measurement results showed that there were oxygen-containing groups on the surface of the activated carbon. The oxygen-containing gro...

Embodiment 2

[0062] 1. Preparation of pretreated carbon support

[0063] 1) Combine carbon nanotubes with HNO 3 After the solution is mixed evenly, heat to 100°C, keep stirring and reflux at 100°C for 1.5h, then cool to room temperature (10°C) and filter, and wash the filter residue with distilled water until the washing liquid is neutral (that is, the effluent after washing pH value is 7.0), where HNO 3 The mass percentage concentration of the solution is 25%, the diameter of the carbon nanotube is 40-60nm, the length is 1-2μm, and the carbon nanotube and HNO 3 The weight ratio of the solution is 1:10;

[0064] 2) drying the washed filter residue at a temperature of 110° C. to a constant weight to obtain a pretreated carbon carrier.

[0065] The oxygen-containing groups on the surface of the pretreated carbon support were measured by Boehm titration. The measurement results showed that there were oxygen-containing groups on the surface of the activated carbon. The oxygen-containing gro...

Embodiment 3

[0075] 1. Preparation of pretreated carbon support

[0076] 1) Combine activated carbon powder with HNO 3 After the solution is mixed evenly, heat to 90°C, keep stirring and reflux at 90°C for 3 hours, then cool to room temperature (25°C) and filter, and wash the filter residue with distilled water until the washing liquid is neutral (that is, the effluent after washing is neutral). pH value is 7.0), wherein, HNO 3 The mass percent concentration of the solution is 15%, the particle size of the activated carbon powder is 50nm, and the activated carbon powder and HNO 3The weight ratio of the solution is 1:15;

[0077] 2) drying the washed filter residue at 120° C. to a constant weight to obtain a pretreated carbon carrier.

[0078] The oxygen-containing groups on the surface of the pretreated carbon support were measured by Boehm titration. The measurement results showed that there were oxygen-containing groups on the surface of the activated carbon. The oxygen-containing gro...

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Abstract

The invention discloses a palladium catalyst for processing chlorinated organics and a method for preparing the same, which belong to the technical field of environment. The catalyst of the invention comprises a carbonaceous carrier and metal palladium, wherein the ratio of the metal palladium to the carbonaceous carrier in part by weight is 0.1-10:100. The method of the invention comprises the following steps: firstly performing acid pretreatment on the carbonaceous carrier; and loading the metal palladium on the carbonaceous carrier by an oxidation reduction method. Active metallic components Pd prepared by the method of the invention are uniformly distributed on the surface of the carbonaceous carrier in an amorphous state, have size distribution less than 5 nm and have the characteristics of strong adhesion, high dispersity and high effective utilization ratio. When in use as an electrochemical cathode catalyst, the multifunctional Pd-loaded catalyst not only endows the chlorinated organics with electroreduction dechlorination capacity (hydrogen is introduced), but also can produce H2O2 through electroreduction (air is introduced). Cathode electroreduction dechlorination and oxidization are combined to treat chlorinated organics wastewater so as to fulfill the aims of full decontamination, energy consumption reduction and decontamination efficiency improvement.

Description

technical field [0001] The present invention relates to a catalyst containing metal and its preparation method, in particular to a catalyst combined with noble metal and its preparation method. Background technique [0002] In recent decades, chlorinated organic compounds have been widely used in industries, such as refrigerator manufacturing, pesticides, plastics, and various organic solvents. Chlorine-containing organic products enter the environment through combustion and other channels, seriously polluting the atmosphere, soil, groundwater and surface water. Chlorinated organic pollutants are an important class of refractory organic compounds, which are extremely harmful, especially polychlorinated organic compounds with low carbon numbers have been proved by the scientific community to be "carcinogenic, teratogenic, Mutagenic" effect. Therefore, the control and treatment of chlorinated organic pollutants has been paid more and more attention by people, and has become ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J21/18B01J37/16C02F1/461C02F101/36
Inventor 王辉卞兆勇张友于
Owner BEIJING FORESTRY UNIVERSITY
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