Functional kaolinite supported Fe/Ni nanoparticles for simultaneous catalytic remediation of mixed contaminants (lead and nitrate) from wastewater

• Published in: Journal of colloid and interface science Vol. 428; no. 428; pp. 302 - 307
• Main Authors: Shi, Lina, Du, Jianhua, Chen, Zuliang, Megharaj, Mallavarapu, Naidu, Ravendra
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 15.08.2014; Elsevier
• Subjects: Bimetallic Ni/Fe; Catalysis; Catalysts; Chemistry; Colloidal state and disperse state; Contaminants; Exact sciences and technology; General and physical chemistry; Iron; Kaolinite; Lead (metal); Nanoparticles; Nickel; Pb (II) and NO3; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Waste water; Wastewater; Nanoparticles; Pb (II) and NO3; Kaolinite; Wastewater; Bimetallic Ni/Fe; Catalytic reaction; Support; Nanoparticle; Lead nitrate; Pb (II) and NO; Contaminant; Waste water; Pb (II) and NO(−)
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2014.04.059

[Display omitted] •Mixed contaminants (Pb (II) and NO3−) were efficiently removed by K–Fe/Ni.•86.3% of Pb (II) and 73.6% of NO3− were removed simultaneously by K–Fe/Ni.•The adsorption of Pb (II) onto kaolinite enhanced the reduction of Pb.•K–Fe/Ni showed good stability and reusability within 4days’ ageing. Kaolinite supported bimetallic Fe/Ni nanoparticles (K–Fe/Ni) demonstrated capacity for simultaneous removal of both cationic and anionic contaminants such as Pb (II) and NO3−. The dispersion of Fe/Ni nanoparticles was improved when kaolinite was used as a stabilizer, and also enhanced the reactivity of K–Fe/Ni. The adsorption of Pb (II) onto the kaolinite and the consequent simultaneous catalytic reduction of Pb (II) and NO3− kaolinite were confirmed by SEM, BET, EDS, XRD and batch adsorption–reduction test. Orthogonal method showed that initial concentrations of Pb (II) and NO3−, as well the dosage of K–Fe/Ni showed the most significant impact on the removal rates, where 86.3% of Pb (II) and 73.6% of NO3− was removed at optimized conditions. In addition, K–Fe/Ni could be stored for 15days in dry air without losing reactivity. Reusability test of K–Fe/Ni indicated that the removal efficiency decreased by 12.5% for Pb (II) and 27.2% for NO3− after using 3 times successively. Two electroplating wastewater samples were tested and showed K–Fe/Ni could remove more than 96% of Pb (II) and NO3− under the optimized conditions.