Remediation of Water Contaminated by Reactive Textile Dyes By Adsorption Using Nickel Oxide Nanoparticles

Articles in Press

Document Type : Research Paper

Authors

1 Department of Soil Science, Faculty of Agriculture, Malayer University, Malayer, Iran

2 Department of Civil Engineering, Faculty of Civil and Architecture, Malayer University, Malayer, Iran

Abstract

Abstract

Water pollution caused by the discharge of industrial wastewater containing reactive dyes, especially from the textile industry, has become one of the major environmental challenges. Azo dyes such as Remazol Black B (RB-B) and Lovafix Blue (LBB) are common pollutants in these wastewaters due to their high stability and widespread use. In this study, the efficiency of nickel oxide (NiO) nanoparticles in the removal of these two dyes by adsorption was investigated. Experiments aimed at determining the optimal conditions were conducted across various ranges of pH (3 to 8), adsorbent dosage (1 to 5 g/L), temperature (20 to 40 °C), and contact time (10 to 180 minutes). The structure and surface properties of the adsorbent were characterized using SEM, EDX, XRD, BET, and FTIR analyses. The results showed that NiO nanoparticles with an average size of approximately 45.67 nm and a specific surface area of 127.18 m²/g exhibited high adsorption capacity. The optimum conditions for the adsorption of RB-B were achieved at pH 7, and for LBB at pH 8. The maximum adsorption capacities for RB-B and LBB were 17.49 mg/g and 13.83 mg/g, respectively. The pseudo-second-order kinetic model (R² = 0.999) and Temkin isotherm model (R² = 0.942) provided the best fit to the data. Furthermore, thermodynamic data confirmed that the process was endothermic and spontaneous. Overall, the results of this study indicate that NiO nanoparticles, due to their effective and cost-efficient performance in dye removal, can be utilized for semi-industrial and industrial wastewater treatment in textile industries.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 03 September 2025

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