najmeh atoub

There is a huge scope for the removal of heavy metal ions from aqueous solutions. In this study, mesoporous silica materials, (MSMs), functionalized with (3-Mercaptopropyl) trimethoxysilane, (MPTS/MSMs), were prepared and used for adsorption of Pb(II) ions from aqueous solutions. The synthesis of MPTS/MSMs adsorbent was done using one-pot hydrothermal method by immobilizing 3-Mercaptopropyl trimethoxysilane onto mesoporous silica surface. The structure and properties of the adsorbent were explored using different techniques such as FT-IR, XRD, SEM, TEM, TGA, and N2 adsorption-desorption isotherms. The adsorption applicability of prepared nanostructure for removal of the Pb(II) ions from the aqueous solution was investigated and the results showed a good selectivity in the absorption of Pb(II) ions over other ions in aqueous solution. The effect of different parameters including the solution pH, Pb(II) concentration, sorbent amount, ion interfering effect, and the contact time onto the removal efficiency of the adsorbent was investigated systematically. The maximum adsorption efficiency (~ 97%) was found for the solutions with pH = 6, the best contact time was seen as 30 min for 50 mg L−1 of the analyte under the optimal conditions. The adsorbent was triumphantly used for the removal of Pb (II) ions from the three real water samples, including tap water, well water, and lake water with the removal efficiency of > 95%.

In this study, thiol-functionalized nanostructure silica type MCM-41 was successfully prepared via the facile one-pot hydrothermal method with low amounts of the directing agent. The mesoporous silica indicated a remarkable adsorption behavior toward Pb(II) ions without any interference of the competing ions. The main experimental variables affecting removal efficiency of the adsorbent were examined, and the optimized conditions were achieved as to be 6, 50 mg, and 30 min for solution pH, the adsorbent dosage, and contact time, respectively. The adsorbent was triumphantly used for the removal of Pb (II) ion from real water samples with a notable removal efficiency as 95%. The concentrations of the competitive ions in the solution were about 10 to 100 times more than Pb (II) ions. The results show that other ions had no interfering effect on the removal efficiency of Pb (II) ions. It means that SH-SiO2 has excellent selectivity for Pb (II) ions and is an appropriate candidate for removing Pb (II) ions from the real samples.