Open AccessPreparation of double-doped Cu, N-nano-TiO2 photocatalyst and photocatalytic inactivation of Escherichia coli in ballast water
Author(s) -
Yue Shi,
Yinhao Wang,
Lu Zheng,
Xixi Wang,
Shun Zhang,
Gaoshuai Wang,
Jianing Li,
Kun Zhang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/450/1/012020
Subject(s) - photocatalysis , sterilization (economics) , titanium dioxide , ballast , catalysis , ultraviolet , materials science , chemical engineering , doping , irradiation , chemistry , nuclear chemistry , organic chemistry , composite material , optoelectronics , biology , ecology , physics , nuclear physics , monetary economics , economics , foreign exchange market , engineering , foreign exchange
With more and more international economic exchanges, ship transport becomes more and more frequent, which further increases the exchange capacity of ship ballast water in different sea areas, thus causing more and more serious marine problems of alien microbial invasion. Therefore, in this paper, on the basis of microbial inactivation of ship ballast water treated by uv irradiation, the influencing factors of its catalytic activity were explored by adding photocatalyst TiO 2 into the bacterial suspension, That is to change the catalytic activity of titanium dioxide noble metal and other modified substances and doping amount. Firstly, the UV-sterilization was used as a control, and the modified photocatalyst nano-TiO 2 was added. It was found that the sterilization rate increased greatly, indicating that the photocatalyst-modified nano-TiO 2 has a very strong reinforcing effect on ultraviolet sterilization. Secondly, the photocatalyst itself was changed. It was found that the amount of photocatalyst nano-TiO 2 had a great influence on UV sterilization. Within a certain range, the more the photocatalyst nano-TiO 2 is, the better the sterilization effect is. Finally, changing the external conditions of the photocatalyst, it was found that the photocatalyst nano-TiO 2 had the best activity at higher temperature (33 °C), alkaline (pH=8.5) or neutral (pH=7.5) and long-wave ultraviolet radiation.