Removal of Direct Black G in aqueous solution using kaolin supported Fe-Ni nanoparticles
高岭土负载纳米铁镍双金属去除水中偶氮染料直接耐晒黑G

Calcinated kaolin supported iron-nickel bimetallic nanoparticles (CK-Fe/Ni) was synthetized and used for the degradation of azo dye Direct Black G (DBG). The parameters affecting the degradation of DBG such as solution pH, dosage, initial concentration of DBG and temperature were investigated. Results show that the 99.98% of DBG in aqueous solution was removed after 20 minutes using CK-Fe/Ni at pH of 9.49, 303 K and 1.05 g/L of CK-Fe/Ni. In addition, batch experiments and scanning electron microscopy (SEM) show that the presence of calcinated kaolin led to adsorb the DBG on the calcinated kaolin, as well as a decrease in aggregation of Fe/Ni nanoparticles and a corresponding increase in the reactivity. The kinetics show that the degradation process of DBG fits well the pseudo-first-order kinetics, and the rate constant increases with the increasing dosage of CK-Fe/Ni with Ea=19.72 kJ/mol. Finally, the degradation of wastewater using CK-Fe/Ni indicates that the 99.98% of DBG was removed.