A study of Reactive Red 198 adsorption on iron filings from aqueous solutions

Abstract

In recent years, reactive dyes have been widely used in textile industries with particular efficiency. They dyes are often toxic, carcinogenic and mutagenic. Improper treatment and non-scientific disposal of dyed wastewater from these industries into water sources has created many environmental problems and concerns around the world. The purpose of the present study is to investigate the efficiency of iron filings in adsorption of Reactive Red 198 from aqueous solutions. This study was conducted using an experimental method at the laboratory scale. In this study, the effects of operating parameters such as pH (1-11), initial dye concentration (40-400 mg/L), contact time (5-120 min) and iron dose (0.1-1 g) with a mesh of<100 were studied. Dye concentration was determined using a spectrophotometer at a wavelength of 520 nm. The results indicated that maximum adsorption capacity of the dye in question was obtained at pH 3, contact time of 60 min and adsorbent dose of 1 g. At initial dye concentration of 100 and 200 mg/L, by increasing the dose of waste iron from 0.1 to 1 g, the removal percentage increased from approximately 76.89% to 97.28% and from 22.64% to 68.03%, respectively. At pH 3, contact time of 5 min and constant waste iron dose of 0.8 g, the dye removal efficiency was 85.34%. By increasing the contact time to 120 min, the removal efficiency increased to 99.2%. Welding iron waste as an inexpensive and available adsorbent has an optimum ability for adsorption of Reactive Red 198 from aqueous solutions.

Removal of arsenic from aqueous solutions using waste iron columns inoculated with iron bacteria

“…[21] Because of it oxidizing role, zero-valence iron has been used for physical removal of contaminants such as arsenic in many studies. [12,13] In addition, changing zero-valent iron into divalent iron creates an energy source for bacteria. Thus, iron bacteria were successful in the adsorption of arsenic from solutions, which increases with time.…”

“…[11] Zero-valent iron is one of the physical methods for removal of pollutants such as arsenic and has been used in some studies. [12,13] So far, most successful methods have used batch and single processes, but few studies have been carried out using continuous-flow processes and a combination of biological and adsorption methods with waste iron. The purpose of this study is to investigate arsenic removal from aqueous solutions using welding waste iron in continuous and batch phases.…”

Phytoremediation of Toxic Metals: A Sustainable Green Solution for Clean Environment

“…With the help of much technical improvement, our world is progressing at an astounding rate. Nonetheless, these developments are causing several difficulties in our environment by disrupting the ecosystem's unique condition [1,2]. Metal contamination in a particular environment such as water, soil, and in organisms is a global issue [3,4].…”