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Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof

A technology of mesoporous activated carbon and titanium dioxide, which is used in physical/chemical process catalysts, water/sewage treatment equipment, catalyst carriers, etc., can solve the problems of low efficiency, difficult recovery and high cost, improve economy and enhance photocatalytic efficiency. Effect

Inactive Publication Date: 2017-05-24
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also many shortcomings. The traditional nano-titanium dioxide suspension phase photocatalyst is easy to deactivate, easy to condense, and difficult to recycle.
Titanium dioxide is generally excited by ultraviolet light in the sun, but the energy of ultraviolet light only accounts for 5% of sunlight, which directly excites TiO 2 The efficiency of the photocatalytic reaction is low. Therefore, the current photodegradation usually uses artificial ultraviolet light as the light source, and the cost is high. These shortcomings are gradually exposed, and the research on the loading of nano-titanium dioxide has received extensive attention.
[0006] Traditional raw materials for activated carbon preparation, petroleum coke, anthracite, asphalt and other resources have limited content, which are non-renewable resources, and long-term large-scale use will destroy the ecological balance

Method used

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  • Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof
  • Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof
  • Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Carbonization and activation of raw materials: The raw materials are mainly camellia oleifera shells. The carbonization / activation integrated muffle furnace designed by our laboratory is used for carbonization / activation experiments. Nitrogen and water vapor are introduced during the activation process, and the flow rates of steam are 0.3mL / min, 0.5mL / min, activated carbon with different specific surface and pore structure can be obtained.

[0059] (2) The activated carbon prepared in step (1) with a steam flow rate of 0.3 mL / min was pretreated differently from the purchased commercial bamboo activated carbon. Type A: Take 20.0g of biomass activated carbon in a beaker, add 1mol / L NaOH solution, soak for 30min, filter, and rinse with deionized water for 3 times. Add about 8% HNO to the rinsed and filtered activated carbon 3 (Add 20mL65%~68%HNO from 140mL water 3 Prepared), boiled for 1h. Suction filtration, and wash with deionized water until neutral, put into ove...

Embodiment 2

[0068] (1) The pretreated bamboo charcoal was loaded with titanium dioxide by the sol-gel method, and calcined by temperature programming in tube furnaces at 400°C, 500°C, and 600°C, respectively. From the XRD pattern ( Figure 4 ) It can also be seen that with the increase of calcination temperature, the crystal form of anatase gradually becomes perfect and sharp, and the grain size increases rapidly at the same time.

[0069] (2) The calcined catalyst was subjected to photocatalytic experiments under the same conditions to explore the influence of different calcination temperatures on the photocatalytic effect of the catalyst. Through experiments, it is possible to establish an image of the degradation of methylene blue solution (indicated by solution concentration) at different calcination temperatures over time, such as Figure 5 .

[0070] pass Figure 5 It can be seen that the calcination temperature of 500°C has the best catalytic performance. By experiment, get F...

Embodiment 3

[0072] (1) Methylene blue is prepared into a solution of 30 mg / L, and other experimental conditions remain unchanged;

[0073] (2) Investigating different amounts of bamboo charcoal / TiO 2 (Calcination at 500°C) Effect of photocatalyst on degradation rate at different time periods. Photocatalyst refers to: sample 4-500, that is, calcined bamboo charcoal / TiO at 500°C 2 .

[0074] Depend on Figure 6 It can be seen that at the same concentration of the reaction solution, the higher the concentration of the reaction catalyst in the solution, the higher the adsorption efficiency and photodegradation efficiency. At the same time, when the amount of catalyst added is 2g / L, the degradation efficiency is basically twice that of 1g / L. However, if the catalyst reaction concentration continues to increase at this time, the photodegradation effect does not increase by multiples but increases very slowly. Therefore, it is the best choice to add a catalyst amount of 2g / L to the actual 3...

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Abstract

The invention discloses a mesoporous activated carbon / titanium dioxide photocatalyst for degrading colored sewage and a preparation method and application thereof and belongs to the techcnial field of colored sewage degrading photocatalysts. The photocatalyst is obtained through activated carbon pretreatment, sol liquid preparation, photocatalyst preparation and the like. A mesoporous pore structure facilitates improvement of absorption effect and degradation efficiency of the photocatalysis process. The recovery problem of the titanium dioxide photocatalyst is solved by adopting the method, and the photocatalytic efficiency of the photocatalyst is improved. The preparation method researching biomass AC / TiO2 is conductive to photocatalyst optimization and makes the photocatalyst adapt to practical application. By applying a research result to actual life for production, life and environment protection, economical efficiency and construction of environmentally friendly society are improved to the most degree. The researched photocatalytic performance influence on the specific surface, calcination temperature and catalyst usage amount can provide valuable experience for production, life and follow-up research.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation agents for colored sewage, and in particular relates to a photocatalyst for degrading colored sewage by mesoporous activated carbon / titanium dioxide, a preparation method and application thereof. Background technique [0002] Titanium dioxide is a relatively common photocatalyst and a semiconductor material with a wide bandgap. It has good application prospects because of its good stability, low cost, strong photocatalytic activity, and harmlessness to the human body. Titanium dioxide usually has three crystal forms: anatase, rutile and brookite. The atoms of the three crystal forms of titanium dioxide crystals are all arranged in an octahedral common vertex structure with 6 O atoms coordinated and a Ti atom in the middle. However, in the unit lattice of the crystal, the rutile type has 2 chemical units of TiO 2 , there are 4 in the anatase type, and 8 in the plate titanium ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/32C02F101/30
CPCC02F1/32B01J21/063C02F2101/308C02F2201/3227B01J35/39Y02W10/37
Inventor 简秀梅蒋恩臣刘孟浩宋艳培许细薇李治宇孙焱
Owner SOUTH CHINA AGRI UNIV
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