Process of photocatalytic reduction for nitrate nitrogen in water with Fe0/TiO2
A technology of nitrate nitrogen and photocatalysis, applied in chemical instruments and methods, reduced water/sewage treatment, physical/chemical process catalysts, etc., can solve the problems of high ammonia nitrogen yield, high price of doped noble metal catalysts, and reduction of non-precious metal photocatalysts Low efficiency and other problems, to achieve the effect of low price and high efficiency
Inactive Publication Date: 2009-12-30
DALIAN UNIV OF TECH
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[0007] The purpose of the present invention is to use iron-doped catalysts to improve the denitrification efficiency of nitrate nitrogen in photocatalytic reduction water, especially to remove nitrate nitrogen in groundwater and drinking water sources, to make denitrification more thorough, and to solve the problem of reducing nitrate nitrogen by zero-valent iron in the past. , high yield of ammonia nitrogen; low reduction efficiency of non-precious metal photocatalysts, high price of doped noble metal catalysts
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Embodiment 1
[0020] Fe 0 / TiO 2 Preparation: Weigh 1.00g of P-25 titanium dioxide activated in a muffle furnace at 300°C for 1h. Add a certain amount of ferrous sulfate heptahydrate, add deionized water to make the volume up to 50 mL, ultrasonically disperse for 20 minutes, and then pass nitrogen for 30 minutes, add stoichiometric sodium borohydride, continue to pass nitrogen for 30 minutes, and centrifuge the precipitate. Wash three times with water and absolute ethanol respectively. Vacuum drying at 60°C in a vacuum drying oven to obtain the required composite catalyst powder particles.
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The present invention belongs to the field of deep water treating and photocatalyzing technology, and provides process of eliminating nitrate nitrogen from water, especially underground water and drinking water. The present invention features that zero-valent Fe doped TiO2 is prepared through chemical reduction and utilized in reducing nitrate nitrogen and decreasing total nitrogen content in water through photocatalytic reaction to avoid formation of harmful ammonia nitrogen and nitrite nitrogen during eliminating dissolved oxygen and replenishing formic acid as electron donor. The present invention provides one new kind of photocatalyst for reducing nitrate nitrogen and decreasing total nitrogen content in water effectively in low cost.
Description
Technical field [0001] The invention belongs to the field of photocatalytic materials and water treatment and purification. Involving the use of Fe 0 / TiO 2 Photocatalytic reduction of nitrate nitrogen in water reduces the total nitrogen content in water. Specifically, it involves the use of inexpensive and efficient nano-zero-valent iron-doped titanium dioxide preparation method. Under the condition of removing dissolved oxygen and supplementing formic acid as an electron donor, the photocatalytic reaction efficiently reduces nitrate nitrogen, avoiding the formation of high proportions of ammonia nitrogen and Harmful products of nitrate nitrogen. Background technique [0002] In recent years, due to the development of agriculture and the excessive use of synthetic fertilizers, the concentration of nitrate nitrogen in global water bodies has been increasing. After high-concentration nitrate saline is consumed by humans, nitrate can be converted and reduced by microorganisms in th...
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IPC IPC(8): C02F1/70C02F1/30B01J23/745B01J21/06C02F101/16
Inventor 柳丽芬董晓艳杨凤林
Owner DALIAN UNIV OF TECH