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: 2010-05-26
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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of pretreated carbon carrier

[0049] 1) Combine activated carbon powder with HNO 3 After the solution is evenly mixed, it is heated to 95°C and kept at 95°C under stirring and reflux treatment for 2h, and then cooled to room temperature (20°C) and filtered. The filter residue is washed with distilled water until the washing liquid is neutral (that is, the effluent after washing is pH value is 7.0), where HNO 3 The mass percentage 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) Dry 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 the Boehm titration method. The measurement results showed that there are oxygen-containing groups on the surface of the activated carbon. The oxyge...

Embodiment 2

[0062] 1. Preparation of pretreated carbon carrier

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

[0064] 2) Dry 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 the Boehm titration method. The measurement results showed that there are oxygen-containing groups on the surface of the activated carbon. The oxy...

Embodiment 3

[0075] 1. Preparation of pretreated carbon carrier

[0076] 1) Combine activated carbon powder with HNO 3 After the solution is evenly mixed, it is heated to 90°C, kept at 90°C and refluxed for 3h with stirring, then cooled to room temperature (25°C) and filtered. The filter residue is washed with distilled water until the washing liquid is neutral (that is, the effluent after washing is pH value is 7.0), where HNO 3 The mass percentage concentration of the solution is 15%, the particle size of the activated carbon powder is 50nm, and the activated carbon powder and HNO 3 The weight ratio of the solution is 1:15;

[0077] 2) Dry 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 the Boehm titration method. The measurement results showed that there are oxygen-containing groups on the surface of the activated carbon. The oxygen-containing gr...

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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 invention relates to a metal-containing catalyst and a preparation method thereof, in particular to a catalyst combined with precious metals and a preparation method thereof. Background technique [0002] In recent decades, chlorinated organic compounds have been widely used in industry, such as refrigerator manufacturing, pesticides, plastics, and various organic solvents. Chlorinated organic compounds have been exposed to volatilization, container leakage, wastewater discharge, pesticide use, and The combustion of chlorinated organic matter products enters the environment and seriously pollutes the atmosphere, soil, groundwater and surface water. Chlorinated organic pollutants are an important class of difficult-to-degrade organic compounds that are extremely harmful, especially low-carbon polychlorinated organic compounds that have been proven by the scientific community to be "carcinogenic, teratogenic, Mutagenic" effect. Therefore, the treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(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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