Abstract
Nowadays, Cr-loaded wastewater released from industrial activities pose an increasing risk to human health and the environment. Adsorption processes have been widely used for the removal of chromium from the waste stream. In this regard, natural adsorbents are the most preferable and cost-effective methods. In this study, the efficiency of Odaracha adsorbent as a novel green technology in the removal of chromium from synthetic wastewater is analyzed. Batch adsorption experiments were conducted to evaluate the effect of contact time, pH, adsorbent dose, and initial concentration of adsorbate on Cr removal. The surface morphology of Odaracha adsorbent was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray powder diffraction. Experimental results showed that Odaracha adsorbent could perform effectively in a wide range of experimental conditions. However, in optimum experimental conditions, such as 180-min contact time, pH 3, and 15 g/L of adsorbent dose Odaracha adsorbent removes 94.68% of Cr from an aqueous solution having 110 mg/L of Cr concentration.
Highlights
Metals are ubiquitous in the environment because of their wide application (Ajmani et al 2019b)
The scanning electron microscope (SEM) images shown in Fig. 1 revealed the surface morphology of Odaracha adsorbent before and after adsorption
In the exploration result of this study, Odaracha soil sourced from Saketa district of Ethiopia was used for the removal of chromium from synthetic wastewater
Summary
Metals are ubiquitous in the environment because of their wide application (Ajmani et al 2019b). They are present in the solid phase and solution, as free ions, or adsorbed to colloidal soil particles. From these metals, hexavalent chromium has no known vital or beneficial effect on organisms, even for bacterial cells, and its accumulation over time in organisms can cause serious illness even at low concentration. According to World Health Organization (WHO) guidelines, the allowable concentration of Cr (VI) in drinking water is 50 ppb (Jiang et al 2013). Clays’ mineral composition, crystal structural characteristics, and their crystalline size make them potentially sound absorbers (Hoidy et al 2009)
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