Study On The Regulatory Mechanism Of Microstructure And Surface Interface Reactivity Of Montmorillonite

Montmorillonite?Mt?is a natural layered silicate mineral with strong adsorption ability,good stability,large specific surface area,widely used in environmental protection,medicine,building materials,petrochemical,plastic and other fields.Since the last century,the microstructure and surface interface reactivity of montmorillonite have aroused great interest and discussion among scholars.In this paper,different types of montmorillonite were prepared by cation exchange,and the influence of the types of interlaminar cation on the microstructure of montmorillonite and the changes in the reactivity of the surface interface were investigated.Montmorillonite was modificated by siloxane.The influence of modification of siloxane on hydrophilicity and hydrophobicity of montmorillonite was investigated.And the microstructure and application of composite siloxane of montmorillonite were studied.Different types of montmorillonite were remodeled by cation exchange?NaCl,MgCl₂?.The loading mechanism of three kinds of interlaminar cation montmorillonite on protamine?PRTM?was studied by XRD,FT-IR etc.The results show that the microstructure of montmorillonite prepared by cation exchange is different.Sodium montmorillonite?Na-Mt?of basic layer spacing is 1.25 nm but magnesium montmorillonite?Mg-Mt?of basic layer spacing is 1.55 nm.And the water stability of the interlayer structure is slightly different.The three types of interlaminar cation montmorillonite also affect the loading effect of protamine.When Ca-Mt and Mg-Mt adsorbed PRTM with the same concentration,the surface spacing of Ca-Mt d₀₀₁ was greater than that of Mg-Mt d₀₀₁.The concentration of PRTM supernatant was detected by Nanodrop 2000,and the experimental results showed that the load of Mg-Mt on PRTM was higher than that of Ca-Mt.It was proved that Mg²⁺may have electrostatic complexation effect on PRTM.Part of PRTM complexation was on the surface of Mg-Mt but did not enter into the interlayer3-amopropyltriethoxysilane?APTES?and n-triethoxysilane?PTES?were used as grafting reagents.And the microstructure changes of organosiloxane grafting modified montmorillonite were investigated.The experimental results show that after APTES grafted modified montmorillonite,ethylsilylated montmorillonite maintains a constant layer spacing due to the formation of crosslinking and column support corridor space.But PTES modified montmorillonite which was same as the unmodified montmorillonite with expansion.Two organosiloxane grafted montmorillonite?APTES-Mt and PTES-Mt?were prepared in three solvents?toluene,cyclohexane and ethanol?,to explore the influence of solvent on grafting modified montmorillonite with siloxane.The experimental results show in the three solvents that the infiltration Angle of APTES grafted modified montmorillonite is different.In ethanol solvent,the droplet surface of APTES-Mt average contact Angle is 15±0.4°.In toluene solvent,the droplet surface of APTES-Mt average contact Angle is 26±0.2°.In cyclohexane solvent,the droplet surface of APTES-Mt average contact Angle is 35±0.3°.It was proved that the contact Angle of APTES grafted modified montmorillonite was different with different polarity of solvent.The more non-polar the solvent,the greater the contact Angle and it is proved that the loading capacity of siloxane is higher in non-polar solventsSiloxane?3-aminopropyl trimethoxysilane,APS?modified montmorillonite which the contact Angle was 55.1±0.3°with hydrophilicity and lipophilicity.Amphiphilic montmorillonite was used to investigate the delivery of hydrophobic drug resveratrol?RSV?.This study result shows that the APS-Mt was improved the efficiency of delivery which slow-release effect of RSV was best in pH 1,37?.