Possible Interaction: Tetracycline and Cupric Cation

“ Cu2+ and TC could produce a synergistic effect under the conditions of coexistence.”

“This novel activation process can occur for a wide range of contaminants (cephalosporin, penicillin and tetracycline antibiotics) and ligands when coordinated with Cu(II) , and N-containing functional groups (e.g. amines) were found to form effective Cu(II) complexes for PDS activation.”

“For the coexisting Cu2+ , Ca2+ , and Zn2+ ions, the Cu2+ ion exhibits a significantly higher inhibitory effect than Ca2+ and Zn2+ ions for tetracycline degradation.”

“However, the residual TC in solution increased from 0 to ∼6 mg/L as the concentration of Cu(II) increased from 0 to 1 mmol/L, suggesting a competition between TC and Cu(II) for the adsorption sites in NZ.”

“Low levels of Cu(II) (<0.01 mmol/L) enhanced the extent of TC adsorption from ∼0.4 mg/g (in the absence of Cu(II)) to ∼0.5 mg/g (with 0.01 mmol/L Cu(II)), resulting in 99% removal of the total TC content.”

“The adsorption process was better simulated by the pseudo-second-order kinetics model, but the isotherm model that was more fitting changed from the Langmuir to the Freundlich model as Cu(II) increased, indicating the coexistence of Cu(II) and TC altered the adsorption mechanisms.”

“ TC degradation by ZnO NPs first increased then decreased with increasing Cu(II).”

“… TC … Cu(II) coexistence increased with increasing pH from 3 to 6, while decreased with further increase in pH. HA inhibited the degradation of TC by …(II), while TC degradation decreased from 91 to 73% and from 73 to 37% in the presence and absence of Cu(II), respectively.”

“The adsorption capacity of TC was significantly enhanced when it coexisted with Cu2+.”

“However, Cu(II) hindered TC adsorption onto water hyacinth roots on the whole at pH range from 6–10, since the stronger electrostatic repulsion and formation of CuOH+ and Cu(OH)2.”

“The additions of Cu(II) significantly increased TC adsorption onto water hyacinth roots within the pH range 4 to 6, because copper formed a strong metal bridge between root surface and TC molecule, facilitating the adsorption of TC by roots.”

“Therefore, the interaction between Cu(II) and TC under different environmental conditions should be taken into account to understand the environmental behavior, fate, and ecotoxicity of TC.”

“…,Cu(ii) … tetracycline by serving as a bridging agent between tetracycline and nano-NiO. The findings of this study have important implications for the risk assessment … strongly adsorb tetracycline antibiotics, resulting in the changes of environmental risks of the metal oxide nanomaterials and/or bioavailability of the adsorbed contaminants.”

“Results showed that coexistence of TC and Cu(II ) showed a significant antagonistic effect, while TC and Cd(II) showed a synergistic effect.”

“The aqueous speciation of TC with two metal cations was calculated using a chemical equilibrium software Visual MINTEQ and results indicated that a strong complexation exist between TC and Cu(II ), while much weaker interaction between TC and Cd(II).”

“The adsorption of TC on R-AC was markedly enhanced when coexisted with Cu(II) , up to 13 times of that in sole system, whereas Cu(II) uptake seldom decreased in the copresence of TC.”