soil remediation using nano zero-valent iron synthesized by an ultrasonic method

a new method for the synthesis of nano zero-valent iron (nzvi) was developed in the present study.ultrasonic waves, as a novel method, were used to synthesize the nanoparticles. the morphologyand surface compositions of the particles were characterized by using fesem, xrd, bet, andparticle size analyzer. the synthesized nanoparticles were then utilized as a fenton-like catalyst todegrade of hydrocarbon contaminants of soil. the effect of using ultrasonic waves in combinationwith nzvi for hydrocarbon degradation was also investigated. the effects of ultrasonic power, nzviconcentration, ph, hydrogen peroxide concentration, and temperature on remediation were studied.it was found that the new nzvi synthesized by an ultrasound-assisted method had high efficiency insoil remediation. the results indicated that the efficiency of removing hydrocarbons by nzvi was98.57%. finally, the optimum conditions of degradation were obtained when ph, ultrasonic power,nzvi concentration temperature, and hydrogen peroxide concentration were respectively equal to3.5, 500 w, 0.4 gr.l-1, 40 °c, and 30 mm.