Details

Autor(en) / Beteiligte

• Shen, Chensi
• Shen, Yu
• Wen, Yuezhong
• Wang, Hongyu
• Liu, Weiping

Titel

Fast and highly efficient removal of dyes under alkaline conditions using magnetic chitosan-Fe(III) hydrogel

Ist Teil von

• Water research (Oxford), 2011-10, Vol.45 (16), p.5200-5210

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2011

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• The dyeing effluent of high alkalinity, which could not be treated efficiently by traditional wastewater technologies, highlighted the need to explore a technically feasible, highly efficient and cost effective method. Thus, a fast and highly efficient method for the removal of dyes under alkaline conditions using magnetic chitosan-Fe(III) hydrogel was proposed. Firstly, chitosan-Fe(III) hydrogel was prepared by a chelation procedure with cheap and environmentally friendly chitosan and iron salts. We characterized the sorption and desorption of C. I. Acid Red 73, a common type of anionic dye, on magnetic chitosan-Fe(III) hydrogel, to understand its availability for alkaline dyeing wastewater. Sorption of dye to chitosan-Fe(III) hydrogel was fast (adsorption could reach equilibrium in less than 10 min) in a wide pH range, and agreed well to the Langmuir–Freundlich adsorption model with a high maximum adsorption capacity of 294.5 mg/g under pH = 12. Meanwhile, 1 mol/L NaOH was used to desorb the dye efficiently (desorption efficiency 94.4%) and 0.1 mol/L HCl was applied to regenerate the chitosan-Fe(III) hydrogel. The results showed that the chitosan-Fe(III) hydrogel could retain its high efficiency after the desorption and regeneration. The common coexisting ions almost had no negative effect on the dye adsorption of chitosan-Fe(III) and the removals of a variety of anionic dyes suggest that the magnetic chitosan-Fe(III) hydrogel could efficiently adsorb both the acid and reactive dyes under alkaline condition. Overall, the results reported herein indicated that magnetic chtisoan-Fe(III) with high adsorption efficiency and strong magnetic property is very attractive and implies a potential of practical application for alkaline dyeing effluent treatment. By chelation with cheap and environmentally friendly chitosan and iron salts, a novel low-cost magnetic sorbent material was prepared for the fast and highly efficient removal of dyes from highly alkaline water. [Display omitted] ► A fast and efficient method to remove dyes under alkaline conditions was proposed. ► The adsorption of dye to chitosan-Fe(III) hydrogel was a high speed process. ► Dye from alkaline solution could be efficiently removed via the chelation. ► Chitosan-Fe(III) could be regenerated and reused effectively for mostly common dyes.