Impact Of Silver Nanoparticles On The Removal Of Cd(?) By Phanerochaete Chrysosporium And Its Transport And Transformation In Aqueous Solutions

With increasing application of silver nanoparticles in the clinical medical treatment, ceramic material, environmentally friendly paint, water purification, textile,and some consumer products, the release of silver nanoparticles into the aquatic environment is inevitable during the process of production, processing, usage and disposal. Silver nanoparticles, As a new kind of pollutant, may be toxic to the organisms in water and may also affect the normal removal of pollutants in aquatic environment. This research focused on the effect of silver nanoparticles on the removal of a typical heavy meta, cadmium(Cd( ?)) and the transport of silver nanoparticles by using a model white rot fungus species, Phanerochaete chrysosporium.Citrate stabilized silver nanoparticles were synthesized in this research, the data from ultraviolet(UV)-visible light spectroscopy, transmission electron microscopy,dynamic light scattering, and X-ray diffraction(XRD) demonstrated that the hydrodynamic diameter of the synthesized silver nanoparticles was 24.3 ± 0.37 nm,and the silver nanoparticles had a negative surface charge(-47.2 m V). The results of this research showed that the biological removal capacity of Cd(?) increased with the concentration of silver nanoparticles increasing from 0.1 mg/L to 1mg/L. The maximum removal capacity of Cd( ?)(4.67 mg/g) was located at 1 mg/L silver nanoparticles, and then decreased with further increasing silver nanoparticles concentration, suggesting that an appropriate concentration of silver nanoparticles has a stimulating effect on the removal of Cd( ?) by P. chrysosporium instead of an inhibitory effect.Results of Ag~+ and total Ag concentrations in the solutions together with those of HAADF-Scanning transmission electron microscopy and X-ray diffraction demonstrated that added silver nanoparticles had undergone oxidative dissolution and transport from the solution to the surface of fungal mycelia with a greater size.Fourier transform infrared spectra confirmed that hydroxyl, amino, and carboxyl and other functional groups were involved in the removal of Cd(?) and the transport and transformation of silver nanoparticles.