A kind of preparation method and application of montmorillonite-humic acid composite colloid particles for adsorption of oxytetracycline

Abstract

The invention discloses a preparation method and application of montmorillonite-humic acid composite colloidal particles for adsorbing oxytetracycline. The preparation method includes: using montmorillonite and humic acid as main raw materials; mixing an alkali solution containing the humic acid with a fixed amount of montmorillonite; performing aftertreatment steps with a series of specific parameters to obtain the montmorillonite-humic acid composite colloidal particles. Montmorillonite and the humic acid are organically compounded together through specific process parameters to obtain an adsorbent material using montmorillonite as a wall material and the humic acid as a core material, and the adsorbent material has quite large specific surface area and special charge attribute and can provide enough adsorption sites, thereby increasing adsorption capacity to oxytetracycline.

Description

technical field [0001] The invention belongs to the field of functional materials, and specifically relates to an adsorption material for treating wastewater containing antibiotics, and further relates to a preparation method and application of a montmorillonite-humic acid composite colloid for adsorbing oxytetracycline. Background technique [0002] Oxytetracycline belongs to tetracycline antibiotics, which is mainly used for infections caused by Gram bacteria. It occupies an important position in the pharmaceutical market and is currently one of the most widely used antibiotics in the world. As an exogenous compound, if it is not handled properly, it will enter the The environment is very likely to form "pseudo-persistent" pollution, which in turn poses a great threat to human health and ecosystems. According to incomplete statistics, antibiotics have been detected in the main water bodies and sediments of the Yangtze River Delta, Pearl River Delta, Liaohe River and Haihe ...

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Problems solved by technology

[0003] At present, domestic and foreign methods for treating oxytetracycline wastewater can be divided into physical methods, chemical methods and biological methods. Among them, biological methods mainly include aerobic treatment, anaerobic treatment and photosynthetic bacteria treatment. Due to the high concentration of soil Mycin has a strong inhibitory effect on microorganisms, so there are great restrictions on the use of biological methods, which require strict influent concentration conditions, and are often used as post-treatment links; chemical methods mainly include photocatalytic oxidation, Fe-C treatment Although the treatment effect is relatively ideal, there are problems of photocatalyst selectivity and high cost; the physical method is still the main treatment method for oxytetracycline wastewater, and can be used as the pretreatment link of the biological method to carry out combined in-depth As the most mature method used in physical methods, the adsorption method has a series of advantages such as convenience, high efficiency, and no secondary pollution. However, the adsorbents currently used to adsorb oxytetracycline are mainly activated carbon and modified nanomaterials. Mainly, the cost is too high or the preparation process is complicated, which limits its further extensive application in this direction

[0004] Application No. 201010557877.2 "A Method for Preparing Montmorillonite-Humic Acid Complex under Alkaline Conditions" discloses that the quantitative montmorillonite and humic acid are mixed and shaken and centrifuged in a neutral or alkaline environment to obtain a composite body, the obtained complex is used to adsorb heavy metal cadmium, but the maximum adsorption capacity of the complex prepared by this method is only less than 30mg / g, and the metal and antibiotic properties are completely different. The adsorption capacity is also extremely low

[0005] "Adsorption Characteristics of Different Polar Organic Pollutants on Humic Matter-Montmorillonite Composite" (Zhang Lichao et al., June 2015, Journal of Safety and Environment) also discloses that humic acid and montmorillonite are mixed according to a fixed mass ratio Finally, adjust the pH of the solution to be neutral, centrifuge after stirring, and when the humic acid-montmorillonite complex is adsorbed to different polar organic pollutants, only the adsorption amount of 1,2-dichlorobenzene is the largest, and at the equilibrium concentration When the adsorption capacity is 50mg / L, the highest adsorption capacity is 200mg / kg, but there is still a shortage of extremely low adsorption capacity

[0006] However, the existing removal of oxytetracycline generally uses activated carbon or other compounds. For example, the application number 201610889211.4 "A Preparation Method for Oxytetracycline Adsorbent" discloses the use of Cr(NO 3 ) 3 9H 2 O, H 2 BDC and ethylenediamine are used as raw materials, and the adsorbent is prepared by hydrothermal reaction, but the process of this method is complicated, the reaction is difficult to control, and the adsorption capacity of the adsorbent to oxytetracycline is less than 110mg / g, and it has not been found that Mongolian Research report on the application of delithizing and humic acid in the adsorption treatment of oxytetracycline wastewater

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