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Synthesis technology of magnet carried photocatalyst composite particle, sewage purification method and device

A photocatalyst and composite particle technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, light water/sewage treatment, etc., can solve the disadvantages of small nano-powder particles, unfavorable recovery and reuse, separation and recovery difficulties, and limit practical applications and other issues to achieve good synergistic effects, reduce costs, and improve the efficiency of photocatalytic reactions

Inactive Publication Date: 2006-06-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

suspended phase TiO 2 Photocatalysts have higher activity than stationary phases, but the existing technical problem is that nano-powders are too small to be recycled and reused, which limits their practical application.
It is difficult and expensive to separate and recover uniformly dispersed photocatalysts from the system

Method used

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  • Synthesis technology of magnet carried photocatalyst composite particle, sewage purification method and device
  • Synthesis technology of magnet carried photocatalyst composite particle, sewage purification method and device
  • Synthesis technology of magnet carried photocatalyst composite particle, sewage purification method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The photocatalytic reaction device of the present invention ( figure 1 , figure 2 ) before working, feed the condensed water 6 to make the water flow in the hollow interlayer of the quartz sleeve 11, and take away the heat generated by the high-pressure mercury lamp 1, so as to ensure that the photocatalytic reaction is carried out at a constant temperature. After the aeration device is ventilated, the aeration tube 3 evenly covered with pores will evenly emerge, and under the action of the combined air distribution plate 2, the gas will be more dispersed and agitated, so that the photocatalyst 10 and the sewage are evenly mixed. Simultaneously, air is introduced to provide the required reactant oxygen. Under the action of the bias electrode 5, TiO is generated on the titanium plate 2 , participate in the photocatalytic reaction and improve the photocatalytic efficiency. The outer wall of the quartz casing and the inner wall of the plexiglass container are ground, a...

Embodiment 2

[0035] The degradation experiment of magnetically supported photocatalysts on saline organic sewage, under the same conditions, through the photocatalyst TiO 2 / SiO 2 / Fe 3 o 4 For the degradation of methyl orange wastewater containing 1%, 1.5%, 2.0%, and 2.5% of NaCl mass fraction (concentration is 20mg / L), the catalytic degradation of high-salt organic sewage that cannot be degraded by traditional biochemistry is investigated by magnetic-loaded photocatalysts performance. Depend on Figure 10 It can be seen that under certain conditions, with the increase of salt content, the photocatalyst TiO 2 / SiO 2 / Fe 3 o 4 The degradation rate of dye wastewater is almost unaffected, and the degradation rate increases with the increase of the light time. After 20 minutes, the increase gradually stabilizes, and the degradation rate reaches more than 95%, which shows that the magnetic photocatalyst can degrade organic salty sewage very effectively. At present, conventional methods...

Embodiment 3

[0037] The degradation experiment of magnetically supported photocatalysts on phenol-containing wastewater, under the same conditions, through the degradation of wastewater with different concentrations of phenol, the TiO 2 / SiO 2 / Fe 3 o 4 Catalytic degradation performance for refractory phenol wastewater.

[0038] Test item: Volatile phenol content (GB / T7490-1987)

before processing

50mg / L

(1h)

100mg / L

(1.5h)

200mg / L

(2h)

300mg / L

(2h)

400mg / L

(2h)

500mg / L

(2.5h)

1000mg / L

(3h)

after treatment

11.8mg /

L

43.3mg / L

43.6mg /

L

39.5mg /

L

58.4mg /

L

103mg / L

168mg / L

Degradation rate

76.4％

56.7％

78.2％

86.8％

85.4％

79.4％

83.2％

[0039] It can be seen from Table 1 that the degradation effect of the magnetic-supported photocatal...

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Abstract

A composite nanoparticle as the magnetic core carried photocatalyst is composed of the magnetic Fe3O4 nanoparticle as core, SiO2 coated on the surface of said core, and TiO2 carried by said SiO2 / FeO4 particle, and is prepared by chemical codepositing method. A method for using said photocatalyst to clean sewage features that the organic pollutants in sewage is deeply oxidized by it to generate CO2 and H2O. Its photocatalyzing apparatus is composed of high-pressure Hg lamp, quartz sleeve tube, bias electrode, condensing water inlet and outlet, gas distributing plate, said photocatalyst, ring reaction chamber, organic class container, sampling opening and aerating unit.

Description

1. Technical field [0001] The synthesis process of magnetic-carried photocatalyst composite particles and the sewage purification method and device of the present invention belong to the industrial sewage purification treatment method and device. A new process combining photocatalytic technology and magnetic recovery technology with magnetic photocatalyst as the core, is to oxidize and decompose organic pollutants in sewage by using strong oxidizing substances produced by magnetic photocatalyst under photocatalysis , so as to achieve the purpose of purification. In particular, the method for purifying sewage by a magnetically loaded photocatalyst and its matching purification device. 2. Background technology [0002] At present, the comprehensive treatment of industrial wastewater has become a major problem that needs to be solved urgently by the world's environmental science circles. With the development of modern industry in recent years, organic wastewater that was diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00B01J21/06B01J23/745B01J37/02C02F1/32C02F1/72
CPCY02W10/37
Inventor 陶杰陶海军汤育欣王玲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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