Study On Preparation And Application Of Oxytetracycline Bacterial Residue-Activation Carbon

It is well known that the pharmaceutical industries play an indispensable role in thenational economy. In2009, Chinese production of antibiotics were ranked first in theworld at14.7million, and the bacterial residue was generated about more than one milliontons each year in China. In the past, the bacterial residues have been used for feeding orfeeding additives in China. Now it is considered as one of hazardous wastes in China.Therefore, there is no practical technology to treat the bacteria residue at home and abroad,so it becomes the bottleneck of sustainable development in the pharmaceutical industries.The paper prepares oxytetracycline bacterial residue-activated carbon by chemicalactivation from oxytetracycline bacterial residue. Based on the characteristic ofoxytetracycline bacterial residue, the experiments study on the optimum conditions ofpreparing and characteristics of oxytetracycline bacterial residue-activated carbon. At thesame time, the experiments further research the adsorption of phenol wastewater andformaldehyde gas using activated carbon under the optimum conditions.Firstly, It is feasible to prepare oxytetracycline bacterial residue-activated carbon bystudying the characteristic (industrial analysis, element analysis, heavy metal contentanalysis, inorganic constituents analysis, polycyclic aromatic hydrocarbons analysis,calorific value analysis)of oxytetracycline bacterial residue.Secondly, the effect factors, activation temperature, activation time and activationratio on the Iodine Adsorption(IA), Specific Surface Area (SSA), Methylene BlueAdsorption (MBA) and Yield are studied, and based on the single factor erperiment, theexperiments get the optimum conditions. The optimum parameters are as follow:800°Cactivation temperature,3h activation time and1:3activation ratio. The Iodine Adsorption,Specific Surface Area, Methylene Blue Adsorption and Yield under optimum conditionsare1002.96mg/g,1593.09m~2/g,117.0mg/g and20.6%, respectively.The ScanningElectron Microscopy (SEM), Pore Structure (PS), Fourier Transform-Infrared Red (FT-IR)and X-Ray Diffraction (XRD) are used to research the surface morphology, crystallitestructure and surface functional groups, respectively.The results show that there areaffluent in the pore structure of oxytetracycline bacterial residue-activated carbon and thesurface functional groups play important roles in the adsorption properties.Thirdly, the paper researches the adsorption of phenol solution onto activated carbonunder optimum conditions, and adsorption kineties and adsorption mechanis are discussed in the work. The different conditions on the adsorption are researched, such as adsorptiontime, temperature of phenol solution, amount of activated carbon, initial concentration ofphenol solution, PH value et al. The results show that the other experimental factors on theactivated carbon adsorption are more apparent effect than the phenol solutiontemperature.What,s more, Langmuir and Freundlich isotherms models are used to studythe experimental data. The results showes that the Langmuir adsorption isotherms modelgives the best fit for adsorption equilibrium of phenol solution. The adsorption datas areresearched by using pseudo-first-order and pseudo-seeond-order kinetic models, and theresults showes that the pseudo-second order model is well fitted for adsorption process.The adsorption mechanism of oxytetracycline bacteria residue-activated carbon can beanalyzed in two ways, which are the pore structure and surface functional groups. Theaffluent of microporous structure and the C≡C and C=Cfunctional groups on the surface ofactivated carbon advance greatly the adsorption of phenol.Finally, adsorption of formaldehyde gas onto activated carbon under optimumconditions is researched by the different conditions in the paper. The results show that theoptimum conditions are as follow: activated carbon particle size of20mesh, formaldehydegas flow rate of4.5m~3/h, indoor temperature of30°C. At the same time, formaldehydegas on activated carbon adsorption mechanism is discussed. The better adsorption capacityof activated carbon is dependent on the the greater specific surface area that isproportional to the abundant microporous, and the surface functional groups.