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Simultaneous removal of Cu 2+ and Cr 3+ ions from aqueous solution based on Complexation with Eriochrome cyanine‐R and derivative spectrophotometric method
Author(s) -
Bagheri Ahmad Reza,
Ghaedi Mehrorang,
Dashtian Kheibar,
Hajati Shaaker,
Bazrafshan Ali Akbar
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3918
Subject(s) - chemistry , adsorption , langmuir , aqueous solution , freundlich equation , langmuir adsorption model , ion , analytical chemistry (journal) , nuclear chemistry , sonication , inorganic chemistry , chromatography , organic chemistry
TiO 2 nanoparticles deposited on activated carbon (TiO 2 –NP–AC) was prepared and characterized by XRD and SEM analysis. Subsequently, simultaneous ultrasound‐assisted adsorption of Cu 2+ and Cr 3+ ions onto TiO 2 ‐NPs‐AC after complexation via eriochrome cyanine R (ECR) has been investigated with UV–Vis and FAA spectrophotometer. Spectra overlapping of the ECR‐Cu and ECR‐Cr complex was resolve by derivative spectrophotometric technique. The effects of various parameters such as initial Cu 2+ (A) and Cr 3+ (B) ions concentrations, TiO 2 ‐NPs‐AC mass (C), sonication time (D) and pH (E) on the removal percentage were investigated and optimized by central composite design (CCD). The optimize conditions were set as: 4.21 min, 0.019 mg, 20.02 and 13.22 mg L −1 and 6.63 for sonication time, TiO 2 –NP–AC mass, initial Cr 3+ and Cu 2+ ions concentration and pH, respectively. The experimental equilibrium data fitting to Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models show that the Langmuir model is a good and suitable model for evaluation and the actual behavior of adsorption process and maximum adsorption capacity of 105.26 and 93.46 mg g −1 were obtained for Cu 2+ and Cr 3+ ions, respectively. Kinetic evaluation of experimental data showed that the adsorption processes followed well pseudo second order and intraparticle diffusion models.