Inorganic Nanomaterials Modified Ferulic Acid Molecularly Imprinted Composite Membraneb

The molecularly imprinted composite membrane is mainly used in chromatographic separation, solid phase extraction and sensors, and other fields, in the process of application is usually in a low pressure environment, using diffusion as the driving force, is not suitable for the separation of industrial scale, in order to improve this situation, this article with ferulic acid molecularly imprinted composite membrane for validation, I choose inorganic nanomaterials as adding inorganic material, introduced the inorganic material to casting solution by blending method, in situ polymerization by uv irradiation preparation ferulic acid molecularly imprinted composite membrane that containing inorganic nanoparticles. This article mainly uses the nano SiO2 as the main additives modified ferulic acid molecularly imprinted composite membrane, and the other a variety of inorganic nanometer materials to do corresponding research.Inorganic nanoparticles have specific surface area, high surface energy and make the particles in the unstable state. In order to achieve a stable state, particles attract each other, reunion and impact application effect. So before added in inorganic nanomaterials in casting membrane system studied the dispersion of inorganic nanometer material and the selected dispersion of inorganic nanometer material conditions, which was good for follow-up study.This research used the flat ultrafiltration device measured the separation properties and water flux of the ferulic acid molecularly imprinted composite membrane with inorganic nanomaterials.Experiments have determined the amount of inorganic nanomaterials, the time range of polymerization by uv irradiation, inspected separation performance and water flux of the ferulic acid molecularly imprinted composite membrane after adding inorganic nanomaterials, varied with the change of temperature. Determination the water contact angle and porosity of ferulic acid molecularly imprinted composite membrane after adding inorganic nanomaterials. Using infrared spectrum analysis the membrane structure and the scanning electron microscope(SEM) on the membrane surface and cross-section were observed. The mechanical properties of the modified membrane were studied by tensile test.Experimental results show that:(1)Inorganic nanometer material dispersion study selected the conditions of the decentralized optimal combination:Amount of inorganic nanomaterials added 0.030 g(0.10%), the dodecyl benzene sulfonic acid sodium content was 0.045 g(0.15%), the magnetic stirring time was 110 min and the ultrasonic dispersing time was 10 min. (2)30 nm SiO2 modified ferulic acid molecularly imprinted composite membrane in the best condition:nano SiO2 particles adding amount was 0.25%, after adding SiO2 nanoparticles of ferulic acid molecularly imprinted composite membrane water flux is ferulic acid molecularly imprinted composite membrane increased by 21.66%, and the separation efficiency increased from 1.90 to 2.60; After adding 30 nm SiO2 nanoparticles of ferulic acid molecularly imprinted composite membrane polymerization by uv irradiation in the best time for the range of 130～140 min. After adding 30 nm SiO2 nanoparticles of ferulic acid molecularly imprinted composite membrane separation performance is hardly affected by the separation of liquid temperature, but the water flux decreases with the rise of temperature, and the reduction of no obvious ferulic acid molecularly imprinted composite membrane; Thre pure water contact angle of ferulic acid molecularly imprinted composite membrane was 92.34°, and the ferulic acid molecularly imprinted composite membrane with 30 nm SiO2 particles was decreased to 82.33°, dramatically improve the hydrophilic; Infrared spectrum analysis showed that the introduction of nano SiO2 particles did not influence the formation of the molecularly imprinted polymer, and SiO2 nanoparticles in the role of physical existence base film; Nano SiO2 enhanced membrane on the surface of the hole density, micro pore structure of the membrane section almost no change, but the thickness of the organic layer obviously thinning; After adding SiO2 nanoparticles, the ferulic acid molecularly imprinted composite membrane is with better strength, toughness and resistance to pressure, make the mechanical properties of original materials have greatly improved, and good mechanical performance, can maintain good mark layer of imprinting. (3)Nano TiO2, Al2O3 and MgO and ZnO added to the casting solution can also improve the ferulic acid molecularly imprinted composite membrane confined ability. Especially,50 nm MgO added to improve the bearing capacity of membrane, the most obvious pressure on the largest capacity can reach 0.42 MPa.This study after adding nanometer material, molecularly imprinted composite membrane with pressure and larger water flux, can satisfy the industrial level of separation.