Adsorptive Removal of Acid Blue 80 Dye from Aqueous Solutions by Cu-TiO₂

Abstract

The adsorption performance of a Cu-TiO2composite for removing acid blue 80 (AB80) dye from aqueous solutions was investigated in terms of kinetics, equilibrium, and thermodynamics. The effect of operating variables, such as solution pH, initial dye concentration, contact time, and temperature, on AB80 adsorption was studied in batch experiments. AB80 adsorption increased with increasing contact time, initial dye concentration, and temperature and with decreasing solution pH. Modeling of adsorption kinetics showed good agreement of experimental data with the pseudo-second-order kinetics model. The experimental equilibrium data for AB80 adsorption were evaluated for compliance with different two-parameter, three-parameter, and four-parameter isotherm models. The Langmuir isotherm model best described the AB80 adsorption equilibrium data. The thermodynamic data revealed that the AB80 adsorption process was endothermic and nonspontaneous. Kinetics, equilibrium, and thermodynamic results indicate that Cu-TiO2adsorbs AB80 by a chemical sorption reaction.

Photocatalytic degradation of textile dyes on Cu2O-CuO/TiO2 anatase powders

“…Typically ZPC of TiO 2 decreases with metal loading due to Schottky barrier formation that results in electron depletion on the TiO 2 and increase in OH groups on the surface. The ZPC of Cu-TiO 2 is typically found in 5.6-6.1 range depending upon the metal loading [46]. At a pH values of a solution higher than pH pzc , the surface of the catalyst gets negatively charged [47,48].…”

Detoxification of pulping black liquor with Pleurotus ostreatus or recombinant Pichia pastoris followed by CuO/TiO2/visible photocatalysis

“…Following the protocol previously described by Puentes-Cárdenas et al . (2016) 71 , CuO/TiO 2 composite samples were prepared as follows: a 10 gL −1 TiO 2 suspension in water and a 1.25 gL −1 CuSO 4 .5H 2 O solution in ethanol were separately sonicated for 1 h each. Subsequently, samples were mixed and sonicated for 15 min.…”

Effect of Cu on optical properties of TiO2 nanoparticles

“…In these spectrum, the characteristic X ray energy emitted from Ti are observed on 4.508 (Kα) and 0.452 (Lα) keV, and O are on 0.525 (Kα) keV, in doped samples the characteristic signals of Cu are observed on 8.040 (Kα) and 0.930 (Lα) keV [22]. In doped samples, the presence of S is identified on 2.307(Kα) keV, which is due to the CuSO4 used by the Cu precursor [23]. There are peaks associated with K (Kα), Ca (Kα), Mg (Kα), Si (Kα) and P (Kα); these lines are attributed to the equipment used for the analysis or impurities (Varma et al, 2014).…”