Solubility and photocorrosion of small CdS particles

Vučemilović, M.I.; Vukelić, N.; Rajh, Tijana

doi:10.1016/1010-6030(88)80057-1

Cited by 29 publications

(17 citation statements)

References 21 publications

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“…−27 to about 10 −15 M for CdS colloids varying from 25 nm to less than 2.5 nm (Vučemilović et al 1988). Wang and Tessier (1999) determined a K sp of 1.5×10 −15 for a crystalline product of less than 2 μm size, and 4.0×10 −15 and 7.1×10 −15 for two precipitates of less than 0.2 μm.…”

Section: Qd-only Effect Of Phmentioning

confidence: 96%

Stability of core/shell quantum dots—role of pH and small organic ligands

Domingos¹,

Franco²,

Pinheiro

2013

Environ Sci Pollut Res

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The improvement of knowledge about the toxicity and even processability, and stability of quantum dots (QD) requires the understanding of the relationship between the QD binding head group, surface structure, and interligand interaction. The scanned stripping chronopotentiometry and absence of gradients and Nernstian equilibrium stripping techniques were used to determine the concentration of Cd dissolved from a polyacrylate-stabilized CdTe/ CdS QD. The effects of various concentrations of small organic ligands such as citric acid, glycine, and histidine and the roles of pH (4.5-8.5) and exposure time (0-48 h) were evaluated. The highest QD dissolution was obtained at the more acidic pH in absence of the ligands (52 %) a result of the CdS shell solubility. At pH 8.5 the largest PAA ability to complex the dissolved Cd leads to a further QD solubility until the equilibrium is reached (24 % of dissolved Cd vs. 4 % at pH 6.0). The citric acid presence resulted in greater QD dissolution, whereas glycine, an amino acid, acts against QD dissolution. Surprisingly, the presence of histidine, an amino acid with an imidazole functional group, leads to the formation of much strong Cd complexes over time, which may be non-labile, inducing variations in the local environment of the QD surface.

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Section: Qd-only Effect Of Phmentioning

confidence: 96%

Stability of core/shell quantum dots—role of pH and small organic ligands

Domingos¹,

Franco²,

Pinheiro

2013

Environ Sci Pollut Res

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“…186,194 Synthetic complexing agents, such as citrate and ethylenediaminetetraacetate (EDTA), similarly promote the dissolution of Cd-based QDs by complexing dissolved ions and weakening nanoparticles structural bonds. 188,190,194,195 Similar to humic acid, extracellular polymeric substances (EPS), which are produced by microorganisms and are abundant in natural waters, 191,196,197 promoted the dissolution of uncapped and ligand-capped CdSe QDs in both DI water and artificial seawater. 169 The promotion of dissolution of CdSe/ZnS QDs by Suwannee River humic acid (up to 50 mg L −1 ) in the dark was only observed for up to 20 days, after which there was no significant dissolution.…”

Section: Environmental Science: Nano Critical Reviewmentioning

confidence: 99%

“…For instance, the solubility product (K sp ) of CdS increased from 7.9 × 10 −27 to 1 × 10 −15 when the diameter decreased from 25 nm to 2.5 nm. 195 Slow dissolution of QDs in high ionic strength media (like seawater) implies that pelagic organisms will be initially exposed in marine systems mainly based on the nanoparticles' colloidal stability. Gradual dissolution and sedimentation will lead to eventual exposure of benthic organisms.…”

Section: Environmental Science: Nano Critical Reviewmentioning

confidence: 99%

Assessing the environmental effects related to quantum dot structure, function, synthesis and exposure

Giroux

Zahra

Salawu

et al. 2022

Environ. Sci.: Nano

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“…The photo-reactor was cooled in order to maintain a constant temperature during each photolytic experiment. Since it is known that colloidal CdS suspensions undergo photocorrosion [10][11][12] and photocatalytic dissolution [13][14][15][16][17] under oxic conditions, the H 2 production experiments were carried out under an argon atmosphere. The photolysis reactors were purged with Ar gas for 30 minutes before the initiation of photolysis in order to eliminate O 2 .…”

Section: Instrumentation and Analytical Proceduresmentioning

confidence: 99%