KEYWORDSSilica-carbon nanoparticles (SCNP) were prepared from sonication of silica and anthracene. The size of homogenous nanoparticle is around 5-20 nm confirmed by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). SEM analysis indicated surface porosity. SCNP were used to remove lead ions (Pb(II)) from aqueous solutions. Adsorption isotherm of Pb(II) on SCNP was well fitted in terms of the Freundlich and Langmuir models. The maximum adsorption capacity of SCNP for Pb(II) was found to be 385 mg/g (1.86 mmol/g) in batch experiment. Thermodynamic studies indicated that sorption process of lead onto SCNP was spontaneous and exothermic. A pseudo-second order model has been employed in order to describe the kinetic adsorption processes, and the thermodynamic activation parameters were calculated. In a column studies, qy the Yan adsorption capacity of SCNP for Pb(II) was found to be 130.66 mg/g (0.63 mmol/g). LeadKinetics Adsorption Thermodynamics Silica-carbon nanoparticle Scanning electron microscope

In the present work, we have synthesized new calixpyrrole modified silica followed by characterization with Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) and scanning electron microscope (SEM) techniques. The behavior of grafted calixpyrrole for the removal of 4-chlorophenol from aqueous media was investigated. Its efficiency was examined through both batch and column extraction methods. The extraction of chlorophenol was carried out as functions of temperature, pH, initial chlorophenol concentration and mass of the adsorbent. Parameters such as initial concentration and quantity of modified silica show a noticeable influence on the uptake capacity of this material. Kinetic studies indicated that the extraction data can be best represented by pseudo second order model. Column extraction data were analyzed through Thomas, Yoon-Nelson and Yan et al models to calculate kinetic coefficients and maximum sorption capacity of the modified silica (III). The extractant can be regenerated by acid treatment without changing its properties.