Bismuth/bismuth titanate heterojunction hollow nanospheres and method for preparing the same and application thereof
The present invention belongs to the field of new material technology and relates to a bismuth/bismuth titanate heterojunction hollow nanospheres and methods for preparing the same and applications thereof. The bismuth/bismuth titanate heterojunction hollow nanospheres is obtained by adding a bismuth salt and tetrabutyl titanate into an organic solvent, mixing evenly, adding an inorganic alkali solution to generate a precipitation, then sequentially adding an organic amine and an organic acid, performing a solvothermal treatment to obtain bismuth titanate hollow nanospheres, and then thermally reducing the bismuth titanate hollow nanospheres with a borohydride under an inert atmosphere. The bismuth/bismuth titanate heterojunction hollow nanospheres provided not only exhibit significant photocatalytic activity in degrading tetracycline hydrochloride but also enable a tighter binding of the metal to the photocatalytic material, thus offering superior structural stability.
1 . A method for photocatalytic degradation of tetracycline hydrochloride, comprising:
(1) preparing bismuth-bismuth titanate heterojunction hollow nanospheres by adding a bismuth salt and tetrabutyl titanate into an organic solvent, mixing evenly, adding an inorganic alkali solution to generate a precipitation, then sequentially adding an organic amine and an organic acid, performing a solvothermal treatment to obtain bismuth titanate hollow nanospheres, and then thermally reducing the bismuth titanate hollow nanospheres with a borohydride under an inert atmosphere to obtain the bismuth-bismuth titanate heterojunction hollow nanospheres; wherein the organic solvent is 2-methoxyethanol or ethylene glycol; wherein a temperature for thermally reducing is 200 to 600° C. for 10 to 100 minutes; and
(2) applying the prepared bismuth-bismuth titanate heterojunction hollow nanospheres by adding the bismuth-bismuth titanate heterojunction hollow nanospheres to an aqueous solution containing tetracycline hydrochloride, and irradiating the aqueous solution under light conditions such that photocatalytic degradation of tetracycline hydrochloride occurs.
2 . The application as claimed in claim 1 , wherein the bismuth salt is bismuth nitrate.
3 . The application as claimed in claim 1 , wherein a molar ratio of tetrabutyl titanate to the bismuth salt is 1:1-2.
4 . The application as claimed in claim 1 , wherein a molar ratio of tetrabutyl titanate to bismuth salt is 1:1.1-1.4.
5 . The application as claimed in claim 1 , wherein a temperature for solvothermal treatment is 100 to 300° C.
6 . The application as claimed in claim 1 , wherein a temperature for solvothermal treatment is 160 to 200° C.
7 . The application as claimed in claim 1 , wherein a duration for solvothermal treatment is 12 to 48 hours.
8 . The application as claimed in claim 1 , wherein the duration for solvothermal treatment is 20 to 36 hours.
9 . The application as claimed in claim 1 , wherein the organic acid is oleic acid, oleic acid d-17 or ricinoleic acid.
10 . The application as claimed in claim 1 , wherein the organic amine is one or more of n-butylamine, isopropylamine, and tert-butylamine.
11 . The application as claimed in claim 1 , wherein the organic amine is n-butylamine or tert-butylamine.
12 . The application as claimed in claim 1 , wherein the temperature for thermally reducing is 300 to 500° C. for 20 to 80 minutes.