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Graphene oxide (GO) is widely used in different applications, however oncerelease into the environment it can change its structure and affect thetransport of important contaminants such as arsenic. In this work we show thatUV radiation, even in the range of 28-74 uW/cm2 of irradiance up to 120 h ofexposure, can induce important changes in the structure of graphene oxide, byeliminating -OH and C=O functional groups. This reduction affected thestability of graphene oxide in water by decreasing its zeta potential from 41to 37 mV with the increase of the exposure time. Our results showed that after24 h of UV exposure, As(III) adsorption capacity decreased from 5 mg/g to 4.7mg/g, however after 48 h of irradiation the adsorption increased with time,reaching 5.1 mg/g at 120 h under 74 uW/cm2 of irradiation. Computer modellingshowed that even a degraded GO structure can have an interaction energy of 53kcal/mol with H3AsO3. Furthermore, we observed that despite clear changes insurface composition and particle size, the reduction of graphene oxidemaintained a high degree of cytotoxicity since cell viability decreased to 60%with a 50 ug/ml dose; except for the sample irradiated at 74 uW/cm2 for fivedays, which showed 20% with the same concentration.

Effect of UV radiation on the structure of graphene oxide in water and its impact on cytotoxicity and As(III) adsorption