Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent

A technology for hexavalent chromium and pollutants, applied in the direction of physical/chemical process catalysts, water pollutants, chemical instruments and methods, etc., to achieve the effect of wide application range, broad application prospects, and improved removal efficiency

Inactive Publication Date: 2011-08-31
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports about the simultaneous treatment of colorless organic phenolic pollutants and the reduction of hexavalent chromium by TiO2 photocatalytic technology, and these related studies are all based on TiO2 Under the irradiation of ultraviolet light, such as the article "Environmental Science and Technology" magazine, 2008, volume 42, page 913, "Kinetics of simultaneous degradation of phenolic compounds and reduction of heavy metal ions by using nano-TiO2 Research” ( Vinu. R.; Madras. G. Kinetics of simultaneous photocatalytic degradation of phenolic compounds and reduction of metal

Method used

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  • Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent
  • Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent
  • Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent

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Experimental program
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Effect test

Embodiment 1

[0040] Preparation of mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst:

[0041] Dissolve bismuth nitrate in nitric acid of a certain concentration, add a mixed solution of tetraisopropyl titanate and isopropanol drop by drop while stirring at room temperature, the molar ratio of bismuth nitrate to titanate is 3.0%, after the addition is completed Stirring was continued for 2 hours, followed by hydrothermal treatment for 5 hours, cooling to room temperature to remove the supernatant, and infrared drying for 2 hours to obtain light yellow mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light photocatalyst.

[0042] A glass reactor containing 50 ml of simulated composite polluted wastewater containing 60 mg / L TCP and 45 mg / L hexavalent chromium, mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of the wastewater to 3.0 with nitric acid, the artificial light source...

Embodiment 2

[0044] The three glass reactors contained 50 ml of simulated composite polluted wastewater, which contained 45 mg / L of hexavalent chromium and TCP with a concentration of 60, 200, and 600 mg / L, respectively, and added mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of wastewater to 3.0 with nitric acid, the artificial light source used is a 300W xenon lamp, equipped with a 420 nm cut-off filter, turn on the light source and irradiate with visible light for 90 minutes , so that the mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst is excited by visible light to undergo charge separation, using TiO 2 The valence band holes or hydroxyl groups generated by oxidized water photocatalytically degrade TCP, while Bi 2 o 3 The conduction band electrons can reduce the coexisting hexavalent chromium to trivalent chromium with low toxicity. The reaction results are shown in Tab...

Embodiment 3

[0046] Each of the three glass reactors contained 50 ml of simulated composite polluted wastewater, which contained 60 mg / L of TCP and 20, 150, and 500 mg / L of hexavalent chromium, and respectively added mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible light catalyst 50 mg (amount of 1.0 g / L composite polluted wastewater), adjust the pH value of wastewater to 3.0 with nitric acid, the artificial light source used is a 300W xenon lamp, equipped with a 420 nm cut-off filter, turn on the light source and irradiate with visible light for 90 minutes , so that the mesoporous Bi 2 o 3 / TiO 2 Composite nano-visible photocatalyst is excited by visible light to undergo charge separation, using TiO 2 The valence band holes or hydroxyl groups generated by oxidized water photocatalytically degrade TCP, while Bi 2 o 3 The conduction band electrons can reduce the coexisting hexavalent chromium to trivalent chromium with low toxicity. The reaction results are shown in Table 1, which sh...

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Abstract

The invention relates to a photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and a preparation method of a catalytic agent. The method comprises the steps of: arousing a mesoporous Bi203 / TiO2 composite nano-visible light catalytic agent with visible light response to generate charge separation under the irradiation of visible light; reducing the hexavalent chromium which is high in toxicity in the wastewater into trivalent chromium which is low in toxicity and small in solubility by a conduction electron of Bi2O3; and removing the organic phenolic pollutants in the wastewater by a valence band hole oxidation method of TiO2 to achieve the aim of effectively purifying the composite polluted wastewater. The method can be performed under a normal temperature, the method is wide in application range, the wastewater does not need to be subsequently treated, the catalytic agent can be circularly used during reacting, and the use ratio of the visible light in the sunlight can be greatly improved, so that the method is wide in application prospect.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment technology for simultaneously removing highly toxic organic phenol pollutants and hexavalent chromium in waste water by using visible light to excite a photocatalyst and a preparation method of the photocatalyst used. Background technique: [0002] Phenolic compounds are a class of protoplasmic poisons that are toxic to almost all organisms. Especially harmful to the human nervous system, it can cause protein coagulation, phenol in the aqueous solution can be absorbed by the skin and cause poisoning, and phenolic wastewater can cause the death of organisms in the water. Because phenolic compounds have great potential hazards to human health and the ecological environment, it is very important to carry out comprehensive treatment and detection of them. Eleven of the 129 priority detection substances promulgated by the US EPA are phenolic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/30C02F1/58C02F1/62B01J23/18C02F1/28C02F101/22C02F101/34
CPCY02W10/37
Inventor 杨娟戴俊李建通李飞飞
Owner HENAN POLYTECHNIC UNIV
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