Visible light responsive doped titania photocatalytic nanoparticles and process for their synthesis
First Claim
1. A process for the synthesis of visible light responsive doped titania photocatalytic nanoparticles, said process comprising the following steps:
- a) milling a mixture, containing;
i) titania;
ii) a precursor compound, wherein the precursor compound is at least one selected from the group consisting of chloroauric acid and a mixture containing chloroauric acid and silver nitrate;
iii) water; and
iv) oxide milling media, wherein the oxide milling media consists of zirconia balls;
at a temperature in the range of 20 to 50°
C. for a period of 30-240 minutes, to form a slurry, wherein the amount of water is in the range of 15 to 25% by weight of the total mixture; and
b) filtering the slurry to separate the oxide milling media from the filtrate and further washing of the filtrate with water to obtain doped titania photocatalytic nanoparticles.
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Abstract
Present disclosure provides a process for the synthesis of visible light responsive doped titania photocatalysts. The process involves step a) milling a mixture containing titania and a precursor compound, the compound selected from the group consisting of chloroauric acid and a mixture containing chloroauric acid and silver nitrate, in the presence of water and oxide milling media, at a temperature in the range of 20 to 50° C. for a period of 60-120 minutes, to form a slurry, wherein the amount of water is in the range of 15 to 25% by weight of the total mixture; and b) filtering the slurry to separate the oxide milling media and obtain a filtrate containing doped titania nanoparticles.
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Citations
10 Claims
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1. A process for the synthesis of visible light responsive doped titania photocatalytic nanoparticles, said process comprising the following steps:
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a) milling a mixture, containing; i) titania; ii) a precursor compound, wherein the precursor compound is at least one selected from the group consisting of chloroauric acid and a mixture containing chloroauric acid and silver nitrate; iii) water; and iv) oxide milling media, wherein the oxide milling media consists of zirconia balls; at a temperature in the range of 20 to 50°
C. for a period of 30-240 minutes, to form a slurry, wherein the amount of water is in the range of 15 to 25% by weight of the total mixture; andb) filtering the slurry to separate the oxide milling media from the filtrate and further washing of the filtrate with water to obtain doped titania photocatalytic nanoparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. Doped titania photocatalytic nanoparticles having particle size in the range of 85-90 nm, having photocatalytic activity under visible light irradiation, wherein the doped titania photocatalytic nanoparticles are gold doped titania and the amount of gold doped on the titania surface is in the range of 0.5-0.7% by weight.
Specification