Mercury is a highly toxic heavy metal. Due to its persistence and biological accumulation in the environment

mercury pollution has become a global problem that needs to be solved urgently. In view of the increasingly prominent problems of Hg

0

emissions in coal-fired power plants

the development and research of low-temperature plasma technology for Hg

0

removal is summarized. The performance of photocatalytic removal of Hg

0

by photocatalyst materials such as titanium dioxide

bismuth halide oxide

metal doped semiconductor and non-metal doped semiconductor was emphatically stated. The results showed that the photocatalytic oxidation ability of Ti O

2

can be improved by metal

or non-metal doping because of its wide energy band. Due to the special chemical structure of bismuth halide oxide

it possessed photocatalytic performances of mercury removal under visible light irradiation. The photocatalytic performance of bismuth halide oxide can be improved by means of the doping of precious metals

metal oxides and non-metal supports.