Efficient arsenic coagulation by serpentine-mediated iron hydroxides

Abstract

A new method was developed for the coagulation of arsenic with serpentine and Fe(II). Excellent removal efficiency (>99%) and satisfactory stability of the sediments were accomplished for As(V) and As(III). A mechanism study showed that hydroxyls generated by the surface hydrolysis of serpentine mediated active iron hydroxides for arsenic adsorption, while the Fe–As and Mg–As chemical interaction contributed to the arsenic stabilization.