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Liquid-phase catalytical processing method for hexavalent chromium in water

A technology of liquid phase catalysis and hexavalent chromium, which is applied in chemical instruments and methods, water/sewage treatment, reduced water/sewage treatment, etc., to achieve the effects of easy implementation, good economic and environmental benefits, and simple operation

Inactive Publication Date: 2010-11-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has not been reported for the processing of hexavalent chromium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Pd / TiO with 1% Pd loading 2 As a catalyst, liquid-phase hydrogenation catalytically reduces hexavalent chromium in water. The catalyst concentration is 0.05g / L, the initial concentration of hexavalent chromium pollutants in water is 20mg / L, the reaction pH value is 2, the hydrogen flow rate is 40ml / min, the reaction time is 30min at normal temperature and pressure, and the degradation rate of hexavalent chromium reaches 100 %.

[0022] It can be seen that catalytic hydrogenation reduction of hexavalent chromium is an effective and feasible method. In this example and the following comparative examples or examples, the degradation rate refers to the ratio of the hexavalent chromium content removed by degradation to the hexavalent chromium content in the initial water body.

Embodiment 2

[0024] Pd / TiO with 1% Pd loading 2 As a catalyst, liquid-phase hydrogenation catalytically reduces hexavalent chromium in water. The catalyst concentration is 0.05g / L, the initial concentration of hexavalent chromium pollutants in water is 50mg / L, the reaction pH value is 2, the hydrogen flow rate is 40ml / min, the reaction time is 50min at normal temperature and pressure, and the degradation rate of hexavalent chromium reaches 100 %.

[0025] When the initial concentration of hexavalent chromium is high, complete degradation can be achieved by prolonging the reaction time.

Embodiment 3

[0027] Pd / TiO with 1% Pd loading 2 As a catalyst, liquid-phase hydrogenation catalytically reduces hexavalent chromium in water. The catalyst concentration is 0.1g / L, the initial concentration of hexavalent chromium pollutants in water is 50mg / L, the reaction pH value is 2, the hydrogen flow rate is 40ml / min, the reaction time is 30min at normal temperature and pressure, and the degradation rate of hexavalent chromium reaches 100 %.

[0028] It can be seen that with the increase of catalyst concentration, the degradation rate of hexavalent chromium increases.

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PUM

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Abstract

The invention discloses a liquid-phase catalytical processing method for hexavalent chromium in water. The method comprises the steps of: adding a supported noble metal titanium dioxide catalyst into water which contains a pollutant, namely hexavalent chromium; adjusting the pH value to be between 1 and 3; and then introducing hydrogen to perform degradation reaction. The liquid-phase hydrogenation catalytical degradation method for the hexavalent chromium has the advantages of remarkable degradation effect, high hexavalent chromium degrading efficiency, high speed, technical feasibility, simple operation and easy implementation.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and relates to a method for removing heavy metal ions in water, in particular to a method for liquid-phase catalytic treatment of hexavalent chromium in water. Background technique [0002] Chromium is a heavy metal ubiquitous in natural water bodies, and its main forms are hexavalent chromium and trivalent chromium. Among them, the toxicity of hexavalent chromium is 100 times greater than that of trivalent chromium. Studies have shown that hexavalent chromium is carcinogenic and is one of the 129 hazardous pollutants identified by the US Environmental Protection Agency (EPA). The source of chromium is mainly divided into two parts. Man-made chromium pollution mainly comes from industrial wastewater discharged from leather, electroplating and textile industries, while chromium in nature mainly comes from chromium gradually released into water from topsoil and rocks. [0003] He...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/62
Inventor 郑寿荣陈欢许昭怡万玉秋李丽媛邵芸刘凤玲王家宏刘景亮
Owner NANJING UNIV
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