Abstract
Water contamination due to release of dye containing effluents is one of the environmental problems of serious concern today. The present study investigate the green synthesis of zinc oxide nanoparticles (ZnO-NPs) doped on activated carbon (AC) prepared from walnut peel extract and to estimate its efficiency in the removal of Eosin Y (Eo-Y) and Erythrosine B (Er-B) from its aqueous solution. The synthesized AC-ZnO was identified by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and the Brunauer-Emmett-Teller. The influence of various parameters such as pH, dosage of AC-ZnO, contact time, and concentrations of Eo-Y and Er-B was also studied. The pH 3 was observed as the optimum pH while the equilibrium was noticed to reach in 30 min at dosage of 1 g/L and initial concentration 100 mg/L for Eo-Y and Er-B adsorption onto AC-ZnO. The maximum adsorption capacity of Eo-Y and Er-B onto AC-ZnO was found to be 163.9 and 144.92 mg/g (and removal efficiencies of 95.11 and 98.31 %), respectively. The process of Eo-Y and Er-B adsorption on AC-ZnO was observed to be depended on the pseudo-second-order kinetic model which indicates chemisorption processes. Langmuir adsorption isotherm model test described the removal of Eo-Y and Er-B on AC-ZnO. The thermodynamic data indicated that the adsorption was endothermic process. Also, the values, SBET and VTOTAL, for the AC-ZnO were equal to 725.65 m2/g and 0.6004 cm3/g, respectively. The results of this study exhibited that AC-ZnO was a very effective method that can be used for the removal of Eo-Y and Er-B from aqueous solutions.
Highlights
The textile industry uses high volumes of dyes and produces wastewaters containing these dyes at a concentration range of 10 – 200 mg/L (Ahmadi et al 2019b, Mendez-Paz et al 2005)
Compared the efficiency of palladium, silver and zinc oxide nanoparticles fixed on active jelly which has been used as an adsorbent to remove dye
The current study focused on the Green synthesis of Walnut peel extract zinc oxide (ZnO) doped activated carbon (AC) nanoparticles
Summary
The textile industry uses high volumes of dyes and produces wastewaters containing these dyes at a concentration range of 10 – 200 mg/L (Ahmadi et al 2019b, Mendez-Paz et al 2005). Nano technology is the crucial and effective technology in science and industry (Ahmadi et al 2020a) It helps to change the atoms and molecules arrangement to achieve new structure which has never been existed before. Zinc oxide nanoparticles (ZnO-NPs) has been widely used in the removal of contaminants due to their advantages such as high catalytic properties, non-toxicity and low cost Compared the efficiency of palladium, silver and zinc oxide nanoparticles fixed on active jelly which has been used as an adsorbent to remove dye. The study of Arabi et al (Arabi et al 2019) has showed that Congo red dye adsorption used activated carbon coated with oxidized nanoparticles. The current study focused on the Green synthesis of Walnut peel extract zinc oxide (ZnO) doped activated carbon (AC) nanoparticles. The kinetics, isotherm and thermodynamics of the adsorption process were studied
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