Activated Carbon Preparation And Its Adsorption Performance And Mechanism For Sulfamethoxazole In Water

Since the invention of penicillin,various antibiotics have been widely used in the treatment of humans and animals.However,most antibiotics cannot be metabolized by biological organisms and excreted into the environment through urine and feces in the form of original drugs,and are not easily degraded in the environment.Among them,sulfa drugs are one of the most widely used antibiotics today,and they are widely used to treat bacterial diseases in humans and animals.Due to its relatively stable chemical structure,sulfonamide drug pollution has been detected in lakes,rivers,groundwater,soil,lake bottom sediments,and even drinking water,and the efficient removal of sulfonamide antibiotic pollutants from the water environment is imminent.Activated carbon materials have high specific surface area,large pore volume,and rich pore structure.They have been applied to the adsorption and removal of sulfonamide antibiotics,but their conventional preparation methods face problems such as uneven mixing of raw materials,complicated preparation processes,and high costs.In this paper,a series of alkali metal organic salts(EDTA-2K,EDTA-2Na and EDTA-4Na)were used as precursors,and a series of activities with a specific surface area of up to 2703 m~2/g and nitrogen doping were prepared by in-situ carbonization-activation carbon.By optimizing the precursor type and calcination temperature,and considering the cost factors of activated carbon comprehensively,the activated carbon(2K-700)obtained by calcining EDTA-2K as the raw material at 700°C was determined as the better activated carbon.The maximum adsorption capacity of oxazole calculated by Langmuir model can reach 907 mg/g.On this basis,the effects of initial adsorption concentration,adsorption time,p H and ionic strength on the adsorption performance were systematically studied,and the adsorption mechanism of sulfamethoxazole was revealed by correlating the pore and chemical structure properties of activated carbon and its adsorption performance,Clarified the decisive role of pore structure in adsorption.In addition,although activated carbon based on alkali metal organic salts can efficiently adsorb and remove sulfamethoxazole pollutants in water,the alkali metal used as a pore-forming agent in the preparation process cannot be reused,the preparation cost is high,and the environment is not friendly.To this end,this article further prepared another activated carbon adsorbent using sucrose as a carbon source and boric acid as a pore-forming agent,which were widely sourced and environmentally friendly,and applied it to the desorption of sulfamethoxazole in water.except.By optimizing the type of solvent,boric acid/sucrose mass ratio and calcination temperature,it is determined that the optimal process conditions are water as the solvent,boric acid/sucrose mass ratio is 1/2,and the calcination temperature is 800?.The specific surface area is 1618 m~2/g,and the maximum adsorption capacity of sulfamethoxazole in water can reach 508 mg/g.The boric acid was further recovered and used again in the preparation of activated carbon,and it was found that the obtained carbon adsorbent still had a higher specific surface area and good sulfamethoxazole adsorption performance.