Calcium titanate photocatalyst for removing arsenic by photocatalysis

A technology of photocatalyst and calcium titanate, which is applied in the field of photocatalysis, can solve the problems of high cost and secondary pollution of water bodies, and achieve the effect of avoiding secondary pollution, simple and easy preparation method, and conducive to large-scale promotion

Inactive Publication Date: 2010-09-15
FUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The catalysts reported to treat arsenic-contaminated wastewater are mainly limited to TiO 2 The main photocatalyst, such as the article "TiO2-photocatalyzed As(III) oxidationinaqueoussuspensions: Reactionkineticsandeffectsofadsorption." reported by Ferguson, M.A, etc., and Wei Zhigang et al. in the Chinese patent announcement CN101492199 introduced platinum-doped titanium dioxide photocatalytic oxidation of arsenic, As (Ⅲ) The removal effect is good but the cost is relatively high, and a large amount of flocculant Al2O3 is required to remove the As(V) generated by oxidation, which is easy to cause secondary pollution of the water body. Therefore, the development of cheap and efficient photocatalytic oxidation of As( Ⅲ), and photocatalysts that can absorb and remove a large amount of As(Ⅴ) generated by oxidation have become a hot spot in photocatalytic research

Method used

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  • Calcium titanate photocatalyst for removing arsenic by photocatalysis
  • Calcium titanate photocatalyst for removing arsenic by photocatalysis
  • Calcium titanate photocatalyst for removing arsenic by photocatalysis

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Embodiment 1

[0023] (1) Preparation of calcium titanate with layered microstructure (TiO(OH) 2 Molar ratio with calcium nitrate is 1:1)

[0024] Dissolve (0.0221mol) n-tetrabutyl titanate in 250mL KOH solution, add deionized water to dilute to 300mL, at this time the concentration of n-tetrabutyl titanate is 0.077mol / L, and the molar ratio of n-tetrabutyl titanate to KOH is 1 : 3.0, stirred for 30 minutes to obtain a mixed solution; then the mixed solution was heated to boiling to completely hydrolyze n-tetrabutyl titanate to obtain TiO(OH) 2 The suspension was centrifuged and washed to obtain 0.0221mol of TiO(OH) 2 . In addition, add 0.0221mol calcium nitrate tetrahydrate solid to 50ml deionized water to be mixed with 0.442mol / L calcium nitrate solution, and then prepare the TiO(OH) 2 Mix with calcium nitrate solution and transfer to high-pressure hydrothermal kettle, TiO(OH) 2 The molar ratio to calcium nitrate is 1:1; slowly drop in 0.4mol / L KOH solution, adjust the pH to above 12,...

Embodiment 2

[0030] Photocatalyst CaTiO 3 Application of treatment of arsenic polluted water body:

[0031] The CaTiO that embodiment 1 obtains 3 Powder (TiO(OH) 2 Molar ratio of 1:1 with calcium nitrate) was used as photocatalyst to degrade As(III). Weighed 80mg sample and added it into 80mL As(III) solution (2mg / L), stirred magnetically, and then turned on the light source for photocatalytic reaction. Take 2mL reaction solution at regular intervals, after centrifugation, divide into two parts, dilute with 2~3% HCL respectively, record as As(III); dilute with hydrochloric acid solution containing 1% thiourea and ascorbic acid (dilute As(Ⅴ) generated by oxidation is re-reduced to As(Ⅲ)) and recorded as total arsenic. The concentrations of As(Ⅲ) and total arsenic were detected by PF6 non-scattering atomic fluorescence spectrophotometry. The degradation of As(Ⅲ) is as follows image 3 As shown, it can be seen from the figure that in the pure photocatalyst CaTiO 3 In the presence of As(...

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Abstract

The invention provides a method for preparing a novel photocatalyst CaTiO3 for processing an arsenic polluted water body, which belongs to a photocatalysis technology in environmental management. The calcium titanate with a lamellar microstructure is obtained for the first time by adopting a product obtained by fully hydrolyzing tetra-n-butyl titanate as a titanium source. In addition, the photocatalyst can effectively optically catalyze and oxidize As (III) and greatly adsorb and remove As (V) generated by oxidization and prevents secondary pollution of the water body caused by a flocculant added after the photocatalyst adopting TiO2 as a main component oxidizes the As (III) in the prior art. Finally, the method for preparing the photocatalyst is simple and easy and is beneficial to popularization at a large scale.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and more specifically relates to the preparation of calcium titanate with a layered microstructure that can be used for photocatalytic arsenic removal. technical background [0002] Arsenic exists in nature in two forms: trivalent arsenic (As(III)) and pentavalent arsenic (As(V)). At present, the processes commonly used to remove arsenic from polluted wastewater mainly include: ion exchange method, reverse osmosis method, coagulation sedimentation method and adsorption method, etc. However, these processes also have defects, such as adsorption method. The commonly used adsorbents are activated carbon and Alumina, but due to the strong mobility of As(Ⅲ), it is more difficult to remove than As(Ⅴ), and the adsorption effect of these adsorbents on As(Ⅲ) is worse than that of As(Ⅴ), but the toxicity of trivalent arsenic is the toxicity of pentavalent arsenic 100 times of that. Therefore, pretreatment i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J35/02C02F1/32C02F1/72C02F1/28C02F101/20
Inventor 付贤智田勤奋庄建东刘平戴文新李朝晖陈旬王绪绪员汝胜郑华荣
Owner FUZHOU UNIV
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