In our previous study, Ag was used to prepare a metal-doped
TiO2 photocatalyst for bacterial (E. coli) disinfection under visible
light irradiation [13]. The results were successful; however, Ag is a
rare and expensive noble metal. The use of a cheaper metal, such as
Cu, instead of the expensive Ag in a metal-doped TiO2 photocatalyst
without a significant decrease in the disinfection activity could
contribute to the development of cheaper photocatalysts for practical
uses. Cu is a relatively abundant and low cost metal, compared
with Ag. Cu ions have exhibited high antibacterial activity against a
wide range of bacteria including Salmonella enterica, Campylobacter
jejuni, Escherichia coli, Listeria monocytogenes, and Staphylococcus
aureus [22–24]. Cu is also a metallic element essential to human
health and is considered a low toxicity metal to humans and is
used in intrauterine devices [25]. A couple of studies reported the
high photocatalytic activity of Cu-doped TiO2 [26–30]. Choi et al.
reported that CuO-TiO2 enhanced hydrogen production compared
with pure TiO2 [26]. Sato et al. reported that Cu aided TiO2 films in
photo-sterilizing microbial cells under irradiation by a white light
fluorescent lamp [27]. The photocatalytic degradation of methylene
blue by TiO2-Cu thin films was investigated by Carvalhoa et al.
[28]. Cu-loaded TiO2 exhibited an approximately two-fold higher
photocatalytic activity compared with Ni-loaded TiO2 under optimum
conditions [29]. However, no systematic research has been
done to elucidate the chemical mechanism of Cu that enhances the
photocatalytic activity of TiO2
In our previous study, Ag was used to prepare a metal-dopedTiO2 photocatalyst for bacterial (E. coli) disinfection under visiblelight irradiation [13]. The results were successful; however, Ag is arare and expensive noble metal. The use of a cheaper metal, such asCu, instead of the expensive Ag in a metal-doped TiO2 photocatalystwithout a significant decrease in the disinfection activity couldcontribute to the development of cheaper photocatalysts for practicaluses. Cu is a relatively abundant and low cost metal, comparedwith Ag. Cu ions have exhibited high antibacterial activity against awide range of bacteria including Salmonella enterica, Campylobacterjejuni, Escherichia coli, Listeria monocytogenes, and Staphylococcusaureus [22–24]. Cu is also a metallic element essential to humanhealth and is considered a low toxicity metal to humans and isused in intrauterine devices [25]. A couple of studies reported thehigh photocatalytic activity of Cu-doped TiO2 [26–30]. Choi et al.reported that CuO-TiO2 enhanced hydrogen production comparedwith pure TiO2 [26]. Sato et al. reported that Cu aided TiO2 films inphoto-sterilizing microbial cells under irradiation by a white lightfluorescent lamp [27]. The photocatalytic degradation of methyleneblue by TiO2-Cu thin films was investigated by Carvalhoa et al.[28]. Cu-loaded TiO2 exhibited an approximately two-fold higherphotocatalytic activity compared with Ni-loaded TiO2 under optimumconditions [29]. However, no systematic research has beendone to elucidate the chemical mechanism of Cu that enhances thephotocatalytic activity of TiO2
การแปล กรุณารอสักครู่..
