The device which can remove particulate matter present in the exhaust from a thermal power plant is:

There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator, which can remove over 99% of particulate matter present in the exhaust from a thermal power plant.

It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles giving them a net negative charge. The collecting plates are grounded and attract the charged dust particles.