The influence of pH on manganese removal by magnetic microparticles in solution
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AuthorFunes, Ana Inmaculada; Vicente Álvarez De Manzaneda, María Inmaculada De; Vicente Álvarez-Manzaneda, Juan De; Cruz Pizarro, Luis José
Manganese removalMagnetic particlesWater qualityMagnetic separation gradient
Water Research 53:110-122
SponsorshipThis work was supported by Junta de Andalucı´a projects P10- RNM-6630 and P11-FQM-7074 (Proyectos de Excelencia, Spain), and MICINN MAT 2010-15101 project (Spain).
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.