Preparation Of Titanium And Lanthanum Mesoporous Bioglass And Study On Removal Performance Of Dyes In Water

Methylene blue (MB) is a kind of cationic dye, it is widely used in industry, it not only have the general characteristics of organic pollutants but also have toxicity to the human body, is one of the difficulties of water purification technology. With the continuous development of water purification technology, due to easy operation and high cost-effectiveness, adsorption technology to stand out, and become a good industrial application prospect of water treatment technology. Mesoporous materials as a new adsorbent caused wide public concern because of their large specific surface area and high porosity. So many scholars began to study its application in the field of environmental pollution control.In this paper, using the sol-gel method with ethyl orthosilicate as precursor, with surfactant P123 as the template agent, with butyl titanate as titanium source, with lanthanum nitrate(La(NO3)3·6H2O) as lanthanum source, synthesize five different proportions of silicon calcium La-doped mesoporous bioactive glasses(BG-La), five different proportions of silicon calcium Ti-doped mesoporous bioactive glasses(BG-Ti) and five different proportions of silicon calcium La-Ti-doped mesoporous bioactive glasses(BG-La-Ti). Using XRD, XPS, FT-IR, TEM, BET to characterize and analyze the material structure and composition, the results show that the aperture is about 2.5 nm, BG-Ti BG-La and BG-La-Ti aperture between 2.1～2.3 nm, they all have mesoporous structure.The three kinds of materials adsorption removal of MB process agreed with the pseudo-second-order kinetics and Freundlich isotherm model, their R2 all over 99%. BG-La-2 of the BG-La series have the best adsorption removal rate close to the 100%; BG-Ti-2 of BG-Ti series have the best adsorption of MB removal rate above 87%. BG-La-Ti series of three kinds of materials to achieve the highest desorption rate of 45%. BG-La series has a higher rate of regeneration, after 10 times BG-La-2 removal rate is still above 90%. Study on the photocatalytic properties of three kinds of materials shows that BG-La-2 of equilibrium in the photocatalytic degradation of removal close to 100%, removal rate of degradation of BG-Ti-2 is 75%, and removal rates of degradation of BG-La-Ti-2 is 20% more than BG-Ti-2, further proof of the necessity of lanthanum-doped.