Adsorption and Removal of Cadmium Ions from Simulated Wastewater Using Commercial Hydrophilic and Hydrophobic Silica Nanoparticles: a Comparison with Sol-gel Particles

作者：Vargas Munoz Susana; Shaday Martinez Martha; Gonzalez Torres Maykel; Pacheco Alcala Sadott; Quintanilla Francisco; Rodriguez Canto Antonio; Rogelio Rodriguez Jose

来源：Water, Air, and Soil Pollution, 2014, 225(10): 2165.

DOI：10.1007/s11270-014-2165-9

• Cadmium ions
• Nanoparticles
• Adsorption
• Flocculation
• Hydrophilic
• Hydrophobic

Adsorption and removal of cadmium ions from simulated industrial wastewater using hydrophilic and hydrophobic commercial silica nanoparticles are reported. These results are compared with those obtained using sol-gel silica nanoparticles. Two types of dense commercial pyrogenic silica nanoparticles with different chemical groups on the surface were used to adsorb cadmium ions: Aerosil A130VS and R972. The pore absence in these particles reduces the surface area and, consequently, the concentration of active chemical groups appropriated for adsorption, as compared with the sol-gel particles that are highly porous; this effect is partially compensated by the small sizes available for these commercial particles. The concentration of cadmium ions was reduced: from 109 to 0.01 ppm for A130VS, from 138 to 1.44 ppm for R972, and from 123 to 0.005 ppm for sol-gel. The flocculation kinetics was obtained using dynamic light scattering and the amount of adsorbed cadmium in the sediment using atomic absorption spectroscopy.

• 出版日期2014-10