▎ 摘　　要

NOVELTY - Method for preparing graphene oxide modified metal sulfide composite photocatalyst involves (a) milling pyrite with a ball mill for 5 minutes, passing through a 100 mesh sieve, washing 6 times with ultrapure water in a volume ratio of 1:5, placing in a freeze dryer to dry for 48 hours, and (b) taking graphene oxide with ultrapure water to 12 mg/ml in a ultrasonic water bath at a temperature of 40-45 degrees C for 30 minutes, taking 1 ml, adding 0.2 g pyrite, grinding with mortar for 5 minutes, putting in a fume hood and air drying to get the composite photocatalyst. USE - The method is used for preparing graphene oxide modified metal sulfide composite photocatalyst which is used in photocatalytic degradation of rhodamine dye in wastewater. ADVANTAGE - The method provides excellent photocatalytic activity than pure pyrite catalyst, and has degradation rate increased by 64%.