Complexation of polyhydroxy-nitroso dyes with \(\text{Co}^{2+}\), \(\text{Ni}^{2+}\), and \(\text{Cr}^{3+}\): characteristics, chemisorption behavior, and application in electroplating wastewater treatment
DOI:
https://doi.org/10.56764/hpu2.jos.2026.5.01.45-55Abstract
Polyhydroxy–nitroso dyes are multifunctional compounds with strong chemisorption capabilities for heavy metal ions, making them promising candidates for wastewater treatment. In this study, the complexation behavior of two phloroglucinol-based polyhydroxy–nitroso dyes with Co²⁺, Ni²⁺, and Cr³⁺ was systematically investigated using UV–Vis, FT-IR, EDX, and EPR spectroscopy. The equilibria of the complexation reactions were examined by spectrophotometric titration, and the stoichiometry and stability constants of the resulting complexes in solution were subsequently determined. The chemisorption performance and potential application of these dyes for treating electroplating wastewater were further evaluated under various pH conditions. The results demonstrated that both polyhydroxy–nitroso dyes form stable complexes with metal cations, primarily of ML and ML₂ types. The synthesized compounds efficiently precipitated selected metal ions from acidic solutions, indicating their suitability as metal-adsorbent materials. When applied to electroplating wastewater, the dyes reduced the concentrations of Co²⁺, Ni²⁺, and Cr³⁺ by more than 85%.
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