Novel Agro-Aaste for Adsorption of Acid Violet 90 from Contaminated Water: Isotherms and Kinetics

Abstract

Abstract Locally available peach seed shell (PSS) waste was utilized to prepare an efficient acid violet dye biosorbent. The peach seed shell powder (PSS) was thoroughly characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersion X-ray (EDX), X-ray diffraction (XRD), and point of zero charge (pHpzc) measurements to elucidate its functional groups, as well as the surface texture morphology and charge. The physicochemical characteristics of the PSS sorbent made from PSS and their applications for acid violet 90 dye were studied. The effect of several process variables (such as contact time, biosorbent dosage, pH, temperature, and initial concentration) on dye uptake capacity was also investigated. Based on the experimental findings, the following optimal process conditions were established in the study (pH 7.0, 0.2 g/L adsorbent mass, 30 ° C and time of 120 min) and the maximum adsorption capacity of acid violet 90 dye in PSS waste was 94.92 mg/g. The experimental equilibrium and kinetic data were described by the Langmuir, Freundlich, and Dubinin-R pseudo-first-order kinetics model, pseudo-second-order kinetics model, and intra-particle diffusion models, respectively. The adsorption thermodynamics of acid violet 90 in PSS waste was investigated. The results indicated that the PSS could be used as an efficient adsorbent to remove acid violet 90 from aqueous solutions.