COMPOSITION FOR REMOVING RED ALGAE, GREEN ALGAE OR DIATOM USING POROUS NANO SIZED TITANIA PHOTOCATALYST, MANUFACTURING METHOD OF SAID COMPOSITION AND RED ALGAE, GREEN ALGAE OR DIATOM REMOVING METHOD USING SAID COMPOSITION

摘要

A composition for removing red tide, green algae and diatom using photocatalytic porous titania nanoparticles is provided to inhibit multiplication of algae in water by inhibiting multiplication of red tide, green algae and diatom in the sea, river, reservoir, etc. and controlling multiplied algae, prevent water contamination by removing nutrients from water, and properly purify water contaminated by severe algae multiplication, a preparation method of the composition is provided, and a method for removing red tide, green algae and diatom in water using the composition is provided. A composition for removing red tide, green algae and diatom using photocatalytic porous titania nanoparticles comprises 10 to 90 weight parts of porous titania nanoparticles with an average particle diameter of 10 to 500 nm and 90 to 10 weight parts of a porous mineral powder including particles with an average particle diameter of 10 to 100 mum. A preparation method of a composition for removing red tide, green algae and diatom using photocatalytic porous titania nanoparticles comprises: (1) a dissolving step of mixing sulfuric acid with a concentration of 80 to 95% with a dry milled titanium ore at a weight ratio of 1.5 to 3.0, and reacting the sulfuric acid with the dry milled titanium ore to prepare a titanium sulfate solution; (2) a mineral mixing step of mixing 90 to 10 weight parts of a mineral powder with 10 to 90 weight parts of titania in the titanium sulfate solution to prepare a titanium sulfate slurry by dissolving the mineral powder into the titanium sulfate solution; (3) a sulfuric acid ion concentration-adjusting step of adding water to the titanium sulfate slurry and agitating the mixture of the titanium sulfate slurry and water to adjust a sulfuric acid ion concentration to a range of 0.01 to 100 ppm; (4) a slurry forming step of heating and agitating the mixture at a temperature of 90 to 110 deg.C for 1 to 3 hours to obtain a titania slurry; and (5) a moisture adjusting step of removing moisture from the titania slurry to adjust a moisture content of a titania cake to a range of 10 to 30%. A method for removing algae comprises the step of injecting 0.1 to 1.0 g/L of a composition for removing red tide, green algae and diatom using photocatalytic porous titania nanoparticles into an area where algae are generated, wherein the composition comprises 10 to 90 weight parts of porous titania nanoparticles with an average particle diameter of 10 to 500 nm and 90 to 10 weight parts of a porous mineral powder including particles with an average particle diameter of 10 to 100 mum. Further, the porus mineral is one selected from CaCO3, MgCO3.CaCO3, Mg3Si4O10(OH)2, CaO, 8(Mg_(3-x)[SiFe)2O5](OH)4, KAl2(Si3Al)O10(OH,F)2, (K,Na)(AlMgFe)2, CaAl2Si2O84H2O, (Na,Ca)Al(SiAl)3O8, (Na, Ca)(SiAl)4O8, SiO2, (MgAl)6(SiLl)4O10(OH)8, (MgFe)6(SiAl)4O10(OH)8, KAlSi3O8, and (CaNa)(SiAl)4O8.