| As the spread of antibiotic contaminants becomes more widespread,the removal of antibiotic contamination residues becomes an issue that must be addressed.Currently,there are many successful precedents for the use of activated carbon in the removal of antibiotic contaminants due to its high value and low cost of use,simple and rapid removal technique,and significantly improved adsorption effect,however,the cost of preparing activated carbon from coal carbon sources and other non-renewable resources is not only extremely high but also affects the sustainable regeneration of the environment,resulting in barriers to the widespread use of this material.It is therefore important to find a cost effective raw material for the preparation of activated carbon for the adsorption of amoxicillin,the most commonly used of the antibiotic contaminants penicillin in farm wastewater,and the preparation of activated carbon from petroleum pitch,which is widely available,has a high carbon content and low cost,is an effective means of solving this problem.In this paper,petroleum asphalt,which is widely available and inexpensive,was used as the experimental method to study the structural materials of asphalt-based activated carbon by means of different activation conditions(variation of activation temperature,variation of activation time and variation of activator content)and to carry out adsorption experiments on antibiotics by the materials of activated carbon.On this basis,the asphalt-based activated carbon was modified by doping with a plant carbon source of grapefruit peel in order to enhance the structural properties of the material;at the same time,a corn straw-petroleum asphalt mixture with a higher cellulose content was selected to prepare corn straw-asphalt-based activated carbon,exploring the use of plant carbon sources The optimum process parameters for the preparation of plant mixed bitumen-based activated carbon from plant carbon sources were explored,and the effects of the process parameters on the adsorption performance of the activated carbon were investigated.The study showed that with the increase of temperature,time and activator concentration,the degree of pore expansion of the material and the number of pores micro all showed a trend of first increasing and then decreasing.The optimum process parameters for the asphalt-based activated carbon were:at an activation temperature of 500℃,an activation time of 3 h and a mass fraction of 40%activator,the specific surface area of the activated carbon was 127.9 m~2/g and the adsorption amount of amoxicillin was On this basis,activated carbon was prepared using grapefruit peel and corn straw doped with bitumen respectively.The results of the study showed that with the increase of temperature,time and activator concentration,the degree of pore expansion of the material and the number of pores micro all showed a trend of increasing first and then decreasing,through orthogonal experiments,the best activation process parameters for grapefruit peel-bitumen-based activated carbon and corn straw-bitumen-based activated carbon were obtained respectively.The activation temperature was 700°C,the activator content was 40%and the activation time was 3h,at which time the specific surface area of the material was 216.3 m~2/g and the adsorption capacity was 122.7 mg/g of the grapefruit peel-asphalt-based activated carbon,whose specific surface area and adsorption capacity increased by 69.1%and101.4%,respectively,compared with the original activated carbon;the activation temperature was 700°C,the activation At an activation temperature of 700°C,an activation time of 3h and an activator mass fraction of 30%,the relevant parameters of the corn straw-asphalt-based activated carbon reached their maximum values,which were 261.1m ~2/g of micro specific surface area and 191.3mg/g of amoxicillin adsorption;the specific surface area and adsorption capacity were increased by 20.7%and 55.9%,respectively,compared with those of the teak peel-asphalt-based activated carbon. |
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