ADSORPTION OF TETRACYCLINE ON BIOCHAR PREPARED FROM MUNICIPAL SLUDGE
In recent years,the preparation of biochar from organic waste has become a research hotspot in many fields.In this paper,biochar(MS-BC)was prepared from municipal sludge(MS)by pyrolysis,and then characterized by FT-IR,SEM,EDS,and BET.The effect of preparation and operation conditions of MS-BC on its adsorption of tetracycline was investigated.The result showed that,the MS-BC 1000 prepared by high-temperature pyrolysis has developed a pore structure with a large specific surface area,and can provide abundant adsorption sites and excellent adsorption performance.The removal rate of tetracycline by MS-BC 1000 was about 98.5％,at the MS-BC dosage of 0.3 g,the adsorption time of 4 h,adsorption temperature(T)of 25 ℃,the oscillation frequency(V)of 200 r/min,the initial pH of 6,and the initial tetracycline concentration(c0)of 50 mg/L.Langmuir adsorption isotherm and Lagergren's quasi-second-order kinetic equation can better explain the adsorption behavior of tetracycline on MS-BC,mainly due to the monolayer adsorption by polar interaction and π-π interaction.The maximum adsorption capacity was 333.3 mg/g.The findings provide a theoretical basis for the reuse of municipal sludge and the treatment of tetracycline antibiotic wastewater.
municipal sludgebiochartetracyclineadsorptionmechanism
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