الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 140 |  |  |
| | | from | 140 | | |
Abstract
Water contamination is a serious problem that threats the human life. Among water pollutants, heavy metals, organic dyes and microbes have drawn great concern due to their high toxicity and wide spread. Titanate nanotubes TNT are promising materials for water treatment due to their unique and fascinating physicochemical properties. In this work sodium titanate nanotubes (Na-TNT) were hydrothermally synthesized and characterized using XRD, FESEM, HRTEM, Zeta potential, nitrogen adsorption and desorption, and FT-IR spectra techniques. After synthesis and characterization of Na-TNT, Ni-TNT sample was produced by submitting the Na-TNT sample to a Ni adsorption Process. The efficiency of Na-TNT for adsorption of Ni(II) from water was tested through different conditions including pH, Na-TNT dose, initial metal concentration, and contact time. The results showed efficient adsorption performance with rapid removal of 90 % of Ni(II) ions within the first 15 minutes and after 30 minutes, the equilibrium was attained with removal efficiency close to 100% at pH = 7 and with an adsorption capacity of 181.2 mg/g. After Nickel removal, the disposable waste of Na-TNT – which is Ni ion exchanged sample (Ni-TNT) – was collected for complete characterization and novel recycling. Ni-TNT was recycled for removal of methylene blue by combined adsorption and photocatalytic degradation. The adsorption efficiency reached (99.5%) and the equilibrium adsorption capacity was 916 mg/g and 330 mg/g for Ni-TNT and Na-TNT respectively. The correlation coefficient R2, error function Chi2, SSE, and MSE were used to evaluate the best fit models to the experimental data. The adsorption mechanism was explored using density functional theory and Monte Carlo simulation. The photocatalytic activity of Ni-TNT was tested through two different types of experiments. More attention was paid to the effect of the light path length through the dye solution and the effect of the experiment container dimensions on the photocatalytic degradation process. Also, both Na-TNTs and Ni-TNTs showed potent antifungal and antimicrobial activity. This work successfully represents TNT as a multifunctional material.