Preparation Of Polyester Nonwovens Supported Caalg/Casio3@Sio2 And Its Adsorption For Pb2+

Calcium silicate/calcium alginate (PET-s-CaAlg/CaSiO3@SiO2) composites supported by polyethylene terephthalate fibers were prepared by chemical crosslinking. The PET-s-CaAlg/CaSiO3@SiO2 was characterized by optical microscope, Scanning Electron Microscopy (SEM), Fourier Transform infrared spectroscopy (FTIR) and BET. As can be seen in SEM, mesoporous SiO2 with the size of 150-200 nm appears on the surface of the material. FTIR shows that Si OH structure has been formed on the surface of PET non-woven fabric. BET analysis showed that the specific surface area of the material increases significantly. The factors affecting the adsorption properties of Pb2+ were simultaneously discussed, such as the initial Pb2+ concentration, adsorption contact time, temperature and pH value. The results show excellent adsorption properties of PET-s-CaAlg/CaSiO3@SiO2 for Pb2+ is obtained and the saturated adsorption amount is 58. 33 mg/g. Its adsorption kinetics for Pb2+ is in accordance with the quasi second-order kinetic model. Low temperature is conducive to adsorption. The adsorption capacities of Pb2+ on PET-s-CaAlg/CaSiO3@SiO2 are affected by the pH of the solution through the ionization of surface functional groups and the degree of hydrolysis of Pb2+. It shows that the best adsorption capacities of Pb2+ is at the pH of 4. 0-6.0.