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Silicon dioxide compounded titanium dioxide catalyst for degrading coking wastewater as well as preparation method thereof

A technology of silicon dioxide and titanium dioxide, which is applied in the field of photocatalysis and sewage treatment, can solve the problems of high practical cost, lower photon efficiency, and low solar energy utilization rate, and achieve the effects of low cost, high catalytic activity, and accelerated degradation reaction speed

Inactive Publication Date: 2014-06-11
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to TiO 2 The forbidden band (Eg=3.2eV) is wide, has ultraviolet light activity, low solar energy utilization rate and high practical cost
On the other hand, the holes and electrons formed by light excitation are easy to recombine, which reduces the photon efficiency

Method used

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  • Silicon dioxide compounded titanium dioxide catalyst for degrading coking wastewater as well as preparation method thereof
  • Silicon dioxide compounded titanium dioxide catalyst for degrading coking wastewater as well as preparation method thereof
  • Silicon dioxide compounded titanium dioxide catalyst for degrading coking wastewater as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The main pollutants of coking wastewater are phenolic compounds and ammonia nitrogen, and phenolic compounds account for more than 60% of the total organic components. Therefore, in this implementation case, phenol and ammonia nitrogen are respectively used as pollutants to prepare simulated wastewater with a certain mass concentration, and the photocatalyst oxidation technology is used for treatment. The photocatalyst is the modified titanium dioxide composite catalyst of the present invention.

[0041] The catalyst of this example is prepared according to the following preparation method: (1) Dissolve 27.2ml of butyl titanate in 190ml of absolute ethanol (the ratio of butyl titanate to absolute ethanol is 1:40), and use Mix well with a rapid mixer to obtain light yellow transparent solution A. (2) Weigh copper nitrate solid with copper content of 1% (the atomic percentage of copper and titanium in solution A), dissolve it in 500ml of water, and mix to obtain solution ...

Embodiment 2

[0044] On the basis of Example 1, the influence of pH is further considered. Change the pH value of the reaction solution (before the reaction, adjust the initial pH value of the solution with NaOH and HCl to be 2, 4.5, 7, 9.5, 10.5 respectively), the catalyst preparation method is the same as in Example 1, and the prepared catalyst and Silica catalyst was used for comparative test of wastewater treatment. When the catalyst dosage is 1.2g·L -1 , it has been shown from experiments that under strong acidity, the degradation rate of photocatalyst is very low, and the degradation rate of phenol is the best when the catalyst is around pH 7.5, which is the same as that without adding SiO 2 In contrast, the pH range of 4 ~ 7.5 composite nano-TiO 2 The photocatalytic activity of the photocatalyst increases, indicating that the addition of SiO 2 The optimal pH range of the final catalyst becomes larger, and it will be more adaptable to the subsequent wastewater treatment than the no...

Embodiment 3

[0046] The waste water in this example was taken from a coking plant in Guizhou. The raw water of the coking plant and the effluent of the secondary sedimentation tank were taken respectively. After passing the test, the water quality results are shown in Table 1.

[0047] Table 1 Main water quality indicators of coking plant wastewater

[0048]

[0049] The experimental device in this example is a photocatalytic reactor using a high-pressure mercury lamp (125W, 365nm) as a light source, and the catalyst prepared by the preparation method in Example 1 is used for reaction. The reaction solution is always stirred under the magnetic stirrer, so that the catalyst and the reaction solution are fully and uniformly mixed, and the reaction solution is continuously aerated to make the solution in an oxygen-saturated state. The reactor is not sealed, and samples are taken regularly for measurement. The composite catalyst is put into the reactor, the experimental method and condition...

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Abstract

The invention discloses a silicon dioxide compounded titanium dioxide catalyst for degrading coking wastewater as well as a preparation method thereof. The catalyst is prepared by comprising the following steps: dissolving butyl titanate into absolute ethyl alcohol; then mixing by taking copper nitrate as a copper source and taking lanthanum nitrate as a lanthanum source, then adding ethyl orthosilicate, and mixing together, stirring and aging, moving to a far infrared drying box, and drying at 105 DEG C, thereby obtaining gel; then roasting gel for 3 hours, and then grinding into powder to obtain the catalyst. The photocatalytic material prepared by the invention is relatively mild in preparation condition, is simple in equipment, and selects butyl titanate and alcohol with low cost as raw materials without a complex technology adopting the sol-gel method for synthesizing traditionally, thereby preventing the influences of high-temperature treatment on morphology and stability of products; doped and compounded elements can be combined with the titanium dioxide catalyst well, thereby impacting the structure of the titanium dioxide catalyst. The catalyst has high catalytic activity, and improves the coking wastewater treatment efficiency greatly.

Description

technical field [0001] The invention relates to the technical field of photocatalysis and sewage treatment, in particular to a silica composite titania catalyst for degrading coking wastewater and a preparation method thereof. Background technique [0002] The coking industry is an important sector of the national economy. The coking wastewater produced in the coking production process is a kind of industrial wastewater with complex pollution composition, high concentration and high toxicity, which is difficult to treat. waste water produced in. It contains a large amount of toxic organic substances and cannot be directly discharged into water bodies. Only a small part of these organic substances can be degraded in the natural environment, and most of them are refractory substances, which cause a certain degree of harm to the ecological environment and human health. In addition to phenolic compounds, the organic matter in coking wastewater also includes aliphatic compounds,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/30C02F1/32
CPCY02W10/37
Inventor 周智芳李世友张婷张庆芳
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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