Adsorption of Cu2+ on Epichlorohydrin-Modified Magnetic Fe3O4 Microspheres Prepared by One-Step Solvothermal Synthesis

作者：Xiao, Shiwei; Liu, Rong; Ma, Jiping; Chen, Fengxi^*

来源：Adsorption Science and Technology, 2015, 33(1): 25-35.

DOI：10.1260/0263-6174.33.1.25

• ONE-POT SYNTHESIS
• METAL-IONS
• NANOPARTICLES
• REMOVAL

Monodisperse epichlorohydrin (ECH)-modified magnetic Fe3O4 microspheres (Fe3O4-ECH-n, where n indicates the initial ECH-to-Fe molar ratio) were prepared by a one-step solvothermal method using mono-ethylene glycol. ECH was grafted onto the surface of Fe3O4 microspheres by in situ dehydrochlorination and hydrolysis. The ECH-derived organic groups (e.g. 1, 2-dihydroxypropyl) provide surface functional sites for the adsorption of Cu2+ on Fe3O4-ECH-n. The Fe3O4-ECH-0.8 microspheres were found to have the highest Cu2+ adsorption capacity (17.5 mg/g), and were magnetically recoverable and reusable for Cu2+ adsorption for at least seven times without significant loss in their adsorption capacity. The addition of 2.5 wt% of NaCl significantly enhanced its Cu2+ adsorption (from 17.5 to 28.5 mg/g). The apparent activation energy of the adsorption process was 14.7 kJ mol(-1). The adsorption process was endothermic (Delta H degrees = 11.8 kJ mol(-1)) and resulted in an increase in the entropy (Delta S degrees = 56.7 J mol(-1) K-1). The negative value of Delta G degrees ensures that the adsorption occurs spontaneously.

• 出版日期2015-1
• 单位青岛理工大学; 武汉工程大学