Facile synthesis of Fe3O4@Cu(OH)2 composites and their arsenic adsorption application.

A directly coating method, controlled double-jet precipitation (CDJP), was developed for synthesizing magnetic Fe 3 O 4 @Cu(OH) 2 composites in combination of advantages of magnetic rapid separation and satisfactory adsorption performance. The morphology and structure of the composites were analyzed by SEM, TEM, XRD, FTIR, XPS and VSM techniques. Through controlling the reaction on Fe 3 O 4 particles, directly coating of Cu(OH) 2 was successfully realized without the extra complicated procedures. The obtained Fe 3 O 4 @Cu(OH) 2 consists of micro particles of size around 250 nm coated with special leaflike nanomorphologies, possessing high saturation magnetization (from 56.5 to 98.84 emu g −1 ). As the amount of loaded Cu increased, As(V) removal of the composites augmented from 11.11 to 35.71 mg g −1 far beyond that of reported traditional magnetic adsorbents. The adsorption isotherm was best fitted by Langmuir adsorption mode and the mechanism was mainly ascribed to the OH functionality of the Fe 3 O 4 @Cu(OH) 2 composites and electrostatic attraction between As(V) species and Fe 3 O 4 @Cu(OH) 2 composites. The Fe 3 O 4 @Cu(OH) 2 composites is a promising candidate for treating arsenic contaminated water. [ABSTRACT FROM AUTHOR]