Abstract

Purpose: This study aims to investigation of the guar gum-manganese dioxide (GG/MnO2) nanocomposite (NC) synthesized using an environment-friendly method and the degradation of reactive yellow (RY 145) dye in the UV system. Design/methodology/approach: Characterization of the GG/MnO2 NCs were conducted using field emission scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectroscopy. Experiments were conducted using a 1 L glass reactor coupled with Ultraviolet (UV-C) blue light bulb of wavelength 250 nm and power of 8 W. Findings: The NC (2.25 g/L) displayed high RY 145 dye degradation (81) with 10 mg/L of concentration at pH 3. The coefficient of determination (R2 0.99) also depicted that the model fits the experimental data. The analysis of variance (ANOVA) showed that the F-values of 464.75, 276.04 and 5.15 are related to the dose of GG/MnO2 NCs, initial concentration of RY 145 dye and solution pH, respectively. Practical implications: The GG/MnO2 NCs followed by photo oxidation process (UV-process) could be used to degrade the RY 145 dye from synthetic wastewater. Originality/value: There are two main innovations. One is that the novel process is performed successfully for RY 145 dye degradation. The other is that the optimized conditions are obtained by Box�Behnken design. Also, the effects of different variables on the RY 145 dye removal efficiency were investigated. © 2022, Emerald Publishing Limited.