The invention relates to a method for preparing expanded
graphite load nanometer
bismuth vanadate photochemical catalyst, which comprises the following steps: 1 adding
bismuthate and stabilizing agent into
phosphate buffer, stirring for 15 to 60 minutes to form turbid liquid, dissolving metavanadate into the
phosphate buffer uniformly, adding the
phosphate buffer into the turbid liquid, and stirring the solution to be uniform to form transparent solution; and 2 regulating potential of
hydrogen (pH) value through alkaline solution, adding expanded
graphite at the temperature of 20 DEG C to 100 DEG C, stirring, mixing, refluxing for 6 hours to 24 hours, centrifuging, filtering, washing, finally
roasting the obtained products, cooling and
grinding to obtain the final product. The method is low in cost, easy to apply and good in maneuverability and has low requirements for devices. The obtained expanded
graphite powder bismuth vanadate is even in self-
assembly, can efficiently degrade durable toxic and harmful substances under conditions of
ultraviolet light and visible light, can be recovered and recycled easily and conveniently and is very suitable for
deep processing of waste water.