Fast adsorption of methylene blue on polyacrylic acid-bound iron oxide magnetic nanoparticles

• Published in: Dyes and pigments Vol. 61; no. 1; pp. 93 - 98
• Main Authors: Mak, Sou-Yee, Chen, Dong-Hwang
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2004; Elsevier
• Subjects: Adsorption; Applied sciences; Chemical industry and chemicals; Dyes, pigments; Exact sciences and technology; Industrial chemicals; Iron oxide; Magnetic nanoparticles; Methylene blue; Polyacrylic acid; Iron oxide; Adsorption; Polyacrylic acid; Magnetic nanoparticles; Methylene blue; Nanoparticle; Temperature effect; Basic dye; Thiazine dye; Magnetic particles; Medium effect; Acrylic acid polymer; pH
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2003.10.008

The adsorption of methylene blue (MB) from an aqueous solution by polyacrylic acid-bound iron oxide magnetic nanoparticles was studied. It was shown that the novel magnetic nano-adsorbent was quite efficient for the adsorption/desorption of MB. In the aqueous solution of MB at 25 °C, the adsorption data could be fitted by the Langmuir equation with a maximum adsorption amount of 0.199 mg/mg and a Langmuir adsorption equilibrium constant of 10.1 ml/mg. The adsorption capacity increased with the increase in solution pH (2–10) and the adsorption process was endothermic in nature with an enthalpy change (Δ H) of 30.9 kJ/mol at 10–40 °C. By using the methanol solution of acetic acid, the adsorbed MB could be desorbed. In addition, it was notable that both the adsorption and desorption of MB were quite fast and could be completed within 2 min due to the absence of internal diffusion resistance.