Abstract
Alizarin red S (ARS) removal from wastewater using sheep wool as adsorbent was investigated. The influence of contact time, pH, adsorbent dosage, initial ARS concentration and temperature was studied. Optimum values were: pH = 2.0, contact time = 90 min, adsorbent dosage = 8.0 g/L. Removal of ARS under these conditions was 93.2%. Adsorption data at 25.0 °C and 90 min contact time were fitted to the Freundlich and Langmuir isotherms. R2 values were 0.9943 and 0.9662, respectively. Raising the temperature to 50.0 °C had no effect on ARS removal. Free wool and wool loaded with ARS were characterized by Fourier Transform Infrared Spectroscopy (FTIR). ARS loaded wool was used as adsorbent for removal of Cr(VI) from industrial wastewater. ARS adsorbed on wool underwent oxidation, accompanied by a simultaneous reduction of Cr(VI) to Cr(III). The results hold promise for wool as adsorbent of organic pollutants from wastewater, in addition to substantial self-regeneration through reduction of toxic Cr(VI) to Cr(III). Sequential batch reactor studies involving three cycles showed no significant decline in removal efficiencies of both chromium and ARS.
Highlights
Large amounts of dye-contaminated wastewaters are released yearly from leather, cosmetics, as well as the pharmaceutical, plastics and textile industries
Alizarin red S (ARS) (Figure 1), or 1,2-dihydroxy-9,10-anthra-quinonesulfonic acid sodium salt, is a water soluble anthraquinone dye originally derived from the root of the madder plant [7]
This study reports on the results sheep wool for as one of priority pollutants
Summary
Large amounts of dye-contaminated wastewaters are released yearly from leather, cosmetics, as well as the pharmaceutical, plastics and textile industries. Removal of ARS wastewater using aluminaliver as adsorbent causes efficient various in health including skin and from stomach irritation, dermatitis, damage, has been investigated at optimum conditions [16]. Applied in removal of Cr(VI) from aqueous by solutions These include adsorption, biosorption, ionHeavy metals, including chromium, are widely distributed in the environment as a result exchange, foam flotation, electrolysis, surface adsorption precipitation, reverse osmosis, sand of numerous industrial applications. These include electroplating, chromate manufacture, filtration, chemical reduction/oxidation, electrochemical precipitation, membrane filtrationwood and preservation, galvanization, steel industry, paint, textile production, oxidative dyeing, cooling water solvent extraction [27,28,29,30]. The outcome of the research could be utilized in a sequential batch reactor for removal of the two pollutants from wastewaters
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