Design And Synthesis Of Mesoporous Carbon-based Materials With Double Channels And Their Adsorption Properties Of Antibiotic Pollutants

Antibiotics are a kind of environmental pollutants that cannot be ignored,in recent years,domestic and foreign scholars have carried out a lot of research on its pollution.As a simple,economical,fast and efficient physical-chemical method,adsorption method plays an irreplaceable role in the field of sewage treatment.Mesoporous carbon-based materials have been widely used to remove antibiotic pollutants in water because of their large specific surface area,high reactivity,and stable physical and chemical properties.In this thesis,mesoporous silica SBA-15 was synthesized by hydrothermal method,on this basis,mesoporous silica SBA-15 was used as the hard template,furfuryl alcohol was used as the carbon source,and oxalic acid was used as the polymerization catalyst to synthesize the tubular ordered mesoporous carbon material CMK-5 with double pores system.The structure was characterized by scanning electron microscopy,powder X-ray diffraction and nitrogen adsorption-desorption.The results show that the mesoporous carbon material CMK-5 has a highly ordered mesoporous structure,and its specific surface area and pore volume are as high as 1391 m~2/g and 1.29 cm~3/g,respectively,has a concentrated double pore distribution at 3.5 nm and 5.7 nm.The material shows strong adsorption and removal ability for different types of antibiotics such as doxycycline hydrochloride(DOX),ciprofloxacin(CIP),tetracycline(TC),ofloxacin(OFX),and in the pH range of 2-10,they all exhibited a stable ability to remove antibiotics,overcoming the shortcomings of the general adsorbent materials instability to antibiotics at different pH.Under the condition that the preparation system of mesoporous carbon material CMK-5 is relatively perfect,we have adjusted the pore structure of mesoporous carbon materials to obtain mesoporous carbon materials with different specific surface areas,on this basis,carboxyl group,cyclodextrin and divalent copper were introduced as active sites for adsorption on the surface of mesoporous carbon respectively,and the adsorption performance of samples with different pore structures for antibiotic contaminants was compared systematically,and forms multiple levels of surface structure by adjusting the position of surface modification,and keeps the open pore structure enables the surface chemical structure and pore structure to achieve a synergistic effect,and the removal rate of the resulting material for antibiotics is significantly improved.Finally,by in-situ synthesis,the nano-particle Cu was successfully loaded onto the mesoporous carbon material CMK-5,and a new mesoporous carbon-based material CMK-5-Cu obtained.Through adsorption and oxidative degradation studies,it is found that the material on the basis of retaining the original structure and characteristics of CMK-5,the introduction of elemental copper does not affect the good adsorbability of the obtained materials to DOX,and has the effect of oxidative degradation on DOX.