Preparation And Properties Of Magniferous Minerals Membrane Adsorbents

In this work, magniferous minerals membrane adsorbents were made of magniferous minerals (sepiolite, attapulgite, vermiculite, hydrotalcite) and polyether sulfone (PES) with the blending method using DMAc as solvent. Then they had been characterized by FT-IR spectrometers, scanning electron microscope, universal force measurement machine and differential scanning calorimetry analyzer to inspect the internal structure. Their adsorption capacity for lead and nickel ion, the adsorption isotherms and adsorption kinetics were also studied. The main results are as follows:The results of the modern analysis instruments showed that the magniferous minerals presented uniform distribution on the PES membranes, they combined with each other with intermolecular forces rather than chemical bonds. The pore structures and the mechanical properties of the membrances changed a lot with the increase contents of magniferous mineral, in addition all the membrances appearred well thermostability.Lead ion was selected as adsorption object to research the S300, A600, V100, H600 membrances adsorbents’adsorption capacity and desorption capacity, the optimum conditions were following:at 25℃, the dosage of S300 was 0.04g, the initial concentration was 100mg/L, it reached a maximum adsorption amount 54.22mg/g after adsorbing for 3h, the dosage of A600 was 0.1 g, the initial concentration was 300 mg/L, it reached a maximum adsorption amount 65.06mg/g after adsorbing for 4h, the dosage of V100 was 0.09 g, the initial concentration was 200 mg/L, it reached a maximum adsorption amount 54.45mg/g after adsorbing for 4h, the dosage of H600 was 0.02g, the initial concentration was 300 mg/L, it reached a maximum adsorption amount 347.27mg/g after adsorbing for 2h. In the range of 25℃ to 45℃, the adsorption processes of S300、A600、H600 fitted well with the Langmuir isotherm accompanying the R1 ranging from 0 tol. The adsorption process of V100 was fitted well with the Freundlich isotherm. All the adsorption mechanisms of S300, A600, V100 and H600 could be better described by pseudo-second-order kinetic model.Nickel ion was selected as adsorption object to research the S600, A400, V100, H400 membrance adsorbents’adsorption capacity and desorption capacity as also, the optimum conditions were following:at 25℃, the dosage of S600 was 0.09g, the initial concentration was 150mg/L, it reached a maximum adsorption amount 40.74mg/g after adsorbing for 4h, the dosage of A400 was 0.1 g, the initial concentration was 150mg/L, it reached a maximum adsorption amount 29.19mg/g after adsorbing for 3h, the dosage of V100 was 0.09 g, the initial concentration was 100mg/L, it reached a maximum adsorption amount 17.21mg/g after adsorbing for 3h, the dosage of H400 was 0.1g, the initial concentration was 200mg/L, it reached a maximum adsorption amount 32.57mg/g after adsorbing for 6h. In the range of 25℃ to 45℃, the adsorption processes of S600、A400、H400 were fitted well to the Langmuir isotherm. The adsorption process of V100 was fitted well to Freundlich isotherm. All the adsorption mechanisms of S600, A400, V100 and H400 could be better accounted by the pseudo-second-order kinetic model.