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dc.contributor.authorLiu, Huiting
Gao, Han
Long, Mingce
Fu, Heyun
Alvarez, Pedro J.J.
Li, Qilin
Zheng, Shourong
Qu, Xiaolei
Zhu, Dongqiang
dc.date.accessioned 2017-08-04T12:30:01Z
dc.date.available 2017-08-04T12:30:01Z
dc.date.issued 2017
dc.identifier.citation Liu, Huiting, Gao, Han, Long, Mingce, et al.. "Sunlight Promotes Fast Release of Hazardous Cadmium from Widely-Used Commercial Cadmium Pigment." Environmental Science & Technology, 51, no. 12 (2017) 6877-6886. https://doi.org/10.1021/acs.est.7b00654.
dc.identifier.urihttp://hdl.handle.net/1911/96592
dc.description.abstract Cadmium pigments are widely used in the polymer and ceramic industry. Their potential environmental risk is under debate, being the major barrier for appropriate regulation. We show that 83.0 ± 0.2% of hazardous cadmium ion (Cd2+) was released from the commercial cadmium sulfoselenide pigment (i.e., cadmium red) in aqueous suspension within 24 h under simulated sunlit conditions. This photodissolution process also generated sub-20 nm pigment nanoparticles. Cd2+ release is attributed to the reactions between photogenerated holes and the pigment lattices. The photodissolution process can be activated by both ultraviolet and visible light in the solar spectrum. Irradiation under alkaline conditions or in the presence of phosphate and carbonate species resulted in reduced charge carrier energy or the formation of insoluble and photostable cadmium precipitates on pigment surfaces, mitigating photodissolution. Tannic acid inhibited the photodissolution process by light screening and scavenging photogenerated holes. The fast release of Cd2+ from the pigment was further confirmed in river water under natural sunlight, with 38.6 ± 0.1% of the cadmium released within 4 h. Overall, this study underscores the importance to account for photochemical effects to inform risk assessments and regulations of cadmium pigments which are currently based on their low solubility.
dc.language.iso eng
dc.rights This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.
dc.title Sunlight Promotes Fast Release of Hazardous Cadmium from Widely-Used Commercial Cadmium Pigment
dc.type Journal article
dc.citation.journalTitle Environmental Science & Technology
dc.citation.volumeNumber 51
dc.citation.issueNumber 12
dc.identifier.digital Sunlight_Promotes_Fast_Release_Hazardous_Cadmium
dc.contributor.publisher American Chemical Society
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1021/acs.est.7b00654
dc.identifier.pmid 28510419
dc.type.publication post-print
dc.citation.firstpage 6877
dc.citation.lastpage 6886


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