Process of catalytically reducing 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 price of doping precious metals, high yield of ammonia nitrogen, low efficiency of reducing nitrate nitrogen, etc. problem, to achieve the effect of low price and high efficiency
Inactive Publication Date: 2007-11-07
DALIAN UNIV OF TECH
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[0007] The purpose of the present invention is to remove nitrate nitrogen in water, especially groundwater and drinking water sources, and to solve the problem of incomplete denitrification of nitrate nitrogen by zero-valent iron reduction and high ammonia nitrogen yield and the photocatalytic reduction of nitric acid without doping precious metal catalysts The problem of low nitrogen efficiency and high price of doped precious metals
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[0020] Fe 0 / TiO 2 Preparation: Weigh 1.00 g of P-25 titanium dioxide activated in a muffle furnace at 300° C. for 1 h. Add a certain amount of ferrous sulfate heptahydrate, add deionized water to make the volume to 50mL, ultrasonically disperse for 20min, then pass nitrogen for 30min, add stoichiometric sodium borohydride, continue to pass nitrogen for 30min, and centrifuge the precipitate. Wash three times with water and ethanol respectively. Vacuum drying at 60° C. in a vacuum oven to obtain the desired 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 fields of photocatalytic materials and water treatment and purification. involves the use of Fe 0 / TiO 2 Photocatalytic reduction of nitrate nitrogen in water reduces the total nitrogen content in water. It specifically involves the use of a cheap and efficient nano-zero-valent iron-doped titanium dioxide preparation method. In the case of removing dissolved oxygen and supplementing formic acid as an electron donor, the photocatalytic reaction can efficiently reduce nitrate nitrogen, avoiding the formation of ammonia nitrogen and inferior nitrogen in a high proportion. Hazardous product of nitrogen nitrate. 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 waters is increasing. After the high-concentration nitrate water is drunk, the nitrate can be transformed into nitrite by microorganisms ...
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Login to View More IPC IPC(8): C02F1/70C02F1/30B01J23/745B01J21/06C02F101/16
Inventor 柳丽芬董晓艳杨凤林
Owner DALIAN UNIV OF TECH