Interference-free detection of trace copper in the presence of EDTA and other metals using two complementary chelating polymers

Bioinspired, direct synthesis of aqueous CdSe quantum dots for high-sensitive copper(ii) ion detection

“…and tyrosine). 45 Inspired by previous reports, 25,[46][47][48] we surmise that Cu + can replace the Cd 2+ ions at the surface of QDs in this system. The progress is schematically illustrated in Scheme 1.…”

“…have been developed in the past decade. [24][25][26][27] More recently, with the rapid development of nanotechnology, luminescent semiconductor QDs have been employed as probes to detect copper(II) ions for improving their performance in terms of sensitivity, limit of detection, selectivity, and reproducibility. Cu 2+ ions in the aqueous QDs solution can strongly disturb the preexisting metal-ligand coordination and result in dramatic changes to their surface nature, leading to different photoluminescence (PL) properties.…”

Removal of Copper(II) in the Presence of Sodium Dodecylobenzene Sulfonate from Acidic Effluents Using Adsorption on Ion Exchangers and Micellar-Enhanced Ultrafiltration Methods

“…Such nitrogen donor atoms (Lewis bases) can interact strongly with the toxic metal ions (Lewis acids) through the coordination-type interactions [45]. Copper is a Lewis acid, a borderline soft metal cation, and, due to its incomplete 3d orbital, it has coordination properties and can form inner-sphere complexes with the Lewis base or a ligand (electron pair donor) [46]. TP220 is also a polymer with weak-base functionalities, due to the presence of pyridine or tertiary amines functional groups; therefore, it can behave in the hydrochloric acid solutions as the weakly basic anion exchanger, and its functional groups are capable of protonation.…”

“…In the chloride solutions, the aliphatic amine is much more deprotonated (the changes of dissociation are constant when the secondary amine is converted to the tertiary amine when it is attached to the matrix of the resin) [23,47]. At acidic pH, two pyridyl nitrogen donor atoms are available to form a bidentate complex with copper ions, and copper uptake occurs through the Lewis acid-base interactions [46,48]. The effect of the chloride ion concentration on the copper-adsorption ability was described previously in [49].…”