Synthesis And Dye Adsorption Performance Of Platelet C/SBA-15Derived From P123/SBA-15

With a wide range of dyes used in our daily production and life, dye wastewatertreatment currently becomes the biggest problem of the industry, especially the treatment ofcationic dye wastewater which is difficult to be biodegraded. It has not only serious harm tothe aquatic environment, the presence of toxic effects on microorganisms, but also thepotential carcinogenicity to humans. Therefore, it has important significance to remove thecationic dye which is hard to be biodegraded, such as the methylene blue.In recent years, the emerging SBA-15mesoporous material attracts wide attention for itsremarkable effect on adsorption of the dyes. The traditional SBA-15mesoporous materialshows fiber-like structure, whose channel direction is parallel to the major axis and length isranging from tens of microns to several hundred microns. Hence, the material is notconducive to the transport and delivery in practical application. However, the hexagonalplatelet short channel SBA-15is more beneficial to mass transfer in practical applications,due to its channel length of only about300-500nm. So it has broad application prospects inthe field of adsorption, catalysis, environmental pollution treatment and so on.The main research contents are as follows:1. Copolymerization method was used in this research work. Fiber-like C/SBA-15composite was synthesized by high-temperature calcinations under N2atmosphere, usingP123as the template, TEOS as the silicon source precursor, and concentrated sulfuric acid asthe post-processing reagent. Based on the original synthetic method, the plate short channelC/SBA-15composite was synthesized by adding metal ion. Then oxidized by saturatedsolution of ammonium persulfate, the platelet C/SBA-15whose surface withoxygen-containing functional groups was obtained;2. Three kinds of the above synthetic materials were system characterized by scanningelectron microscopy (SEM), transmission electron microscopy (TEM), small angle X-raydiffraction analysis (XRD), fourier transform infrared spectroscopy (FT-IR), and the nitrogenadsorption-desorption analysis (BET);3. The three materials were used in the adsorption of methylene blue dye (MB), and their adsorption properties at different pH values and the performance differences in adsorptionkinetics and thermodynamics were compared. Due to the short channel structure is moreconducive to the transport and delivery of materials, the adsorption equilibrium time wasreduced from40mins to15mins; What is more, on account of the presence ofoxygen-containing functional groups, the maximum adsorption capacity was increased from410mg·g-1to473mg·g-1.