Arsenic is one of the main harmful elements in industrial wastewater. How to remove arsenic has always been one of the research hotspots in academic circles. In the process of arsenic removal by traditional sulfuration

the use of traditional sulfurizing agent will introduce new metal cations

which will affect the recycling of acid. In this study

phosphorus pentasulfide (P

2

S

5

) was used as sulfurizing agent

which hydrolyzed to produce H

3

PO

4

and H

2

S without introducing new metal cations. The effect of ultrasound on arsenic removal by P

2

S

5

was studied. Under the action of ultrasound

the utilization of P

2

S

5

was improved and the reaction time was shortened. The effects of S/As molar ratio and reaction time on arsenic removal rate were investigated under ultrasonic conditions. Ultrasonic enhanced heat and mass transfer so that the arsenic removal rate of 94.5% could be achieved under the conditions of S/As molar ratio of 2.1:1 and reaction time of 20 min. In the first 60 min

under the same S/As molar ratio and reaction time

the ultrasonic hydrolysis efficiency of P

2

S

5

was higher. This is because P

2

S

5

forms ([(P

2

S

4

)

]

)

2+

under the ultrasonic action

and the structure is damaged

which is easier to be hydrolyzed. In addition

the precipitation after arsenic removal was characterized and analyzed by X-ray diffraction

scanning electron microscope-energy dispersive spectrometer

X-ray fluorescence spectrometer and X-ray photoelectron spectroscopy. Our research avoids the introduction of metal cations in the arsenic removal process

and shortens the reaction time.