کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4481596 | 1623115 | 2014 | 13 صفحه PDF | دانلود رایگان |
• Magnetic techniques with iron microparticles are used for removing Mn from aqueous solution.
• Mn removal efficiency is extremely high (>98%) for pH > 9.
• However for pH < 9 Mn removal efficiency was significantly reduced.
• An increase in the efficiency was observed when increasing the adsorbent concentration and when coating magnetic particles.
• Low desorption rates and high removal efficiency of reused particles were measured.
An extensive experimental work is reported that aims to assess the efficiency in manganese (Mn) removal from aqueous solution by carbonyl iron microparticles using magnetic separation techniques. A set of batch experiments are performed to explore the effect of pH, adsorbent concentration, surface coating and contact time for achieving the highest Mn removal efficiency. Mn removal efficiency is extremely high (>98%) for pH values larger than 9 as a result of the chemisorption of Mn oxides onto magnetic microparticles. In contrast, Mn removal efficiency for pH < 9 was significantly reduced as Mn remains as a soluble cation. In this manuscript we demonstrate that the efficiency clearly increases when increasing the adsorbent concentration and when using MnOx(s) coated magnetic particles instead of bare particles. Desorption rates from Mn-loaded magnetic particles at different pHs were always lower than 15%. Furthermore, Mn removal efficiency remained at a very high value (>95%) when reused particles were employed in the adsorption process.
Coating magnetic particles with MnOx(s), a highly selective surface for Mn uptake from solution that enhances Mn removal efficiency.Figure optionsDownload high-quality image (241 K)Download as PowerPoint slide
Journal: Water Research - Volume 53, 15 April 2014, Pages 110–122