فهرست مطالب پیام زاهدی

Nowadays, the use of sensitive and selective fluorescent sensors for biological and clinical applications has been important for the early detection and control of various diseases. Since saccharides play an important role in biological processes, their detection is one of the particular importance and there is an urgent need to develop of technology for the continuous control of glucose in patients. Bronic acids, can be reversed and covalently formed by the diols in aqueous solution to form five or six ring esters. Based on this phenomenon, compounds containing bronic acid have been used as receptors in sensors. In this paper, fluorescent sensors based on dyes with bronic acids are introduced.

Adsorption of lead metal ion [Pb(II)] from aqueous samples was investigated using polyethersulfone (PES)/amine-functionalized carbon nanotubes (NCNTs) via changes of pH, stirring speed, contact time, adsorbent content and initial metal ion concentration. The FTIR and EDX results for the modified sample showed that the first type amine groups (N-H2) and the second type amine groups (N-H) were located on the CNT surface. The SEM images also showed CNTs structure change, their breaking down followed by providing more order. The rate of ion adsorption by the nanocomposite sample showed that the kinetic equilibrium of adsorption occurred within the first 10 min of contact time. To maximize the metal ion removal, the amounts of nano-adsorbent, pH and initial ion concentration were determined 0.1 g/100 mL aqueous sample, 7, and 95 ppm, respectively. Also, the Freundlich isotherm model and the pseudo-second order kinetic model had the best correspondence with the experimental data.