Efficiency and mechanism of Bio-FeMnCeOx activated PMS for degradation of tetracycline
In view of the low cost,environmentally friendly and high efficiency of biosynthetic materials in water environmental remediation,Ce-doped biogenic Fe/Mn oxides(Bio-FeMnCeOx)was prepared to degrade tetracycline hydrochloride(TC).The effects of preparation parameters(Ce dosage,cultivation time and polishing methods,i.e.)and procedure parameters(pH,PMS concentration,and Bio-FeMnCeOx dosage,i.e.)of Bio-FeMnCeOx on the degradation of TC by Bio-FeMnCeOx activated PMS were explored.The main species and contribution of reactive oxygen of TC degradation were analyzed by free radical quenching experiments and electron paramagnetic resonance(EPR).The degradation pathway and mechanism of TC was confirmed and the cyclic stability of Bio-FeMnCeOx were verified.The research results indicated that Bio-FeMnCeOx was successfully prepared by biosynthesis,and it was used to activate PMS to degrade TC with good catalytic activity,and the degradation efficiency of TC could reach 93.75%.pH of 11.0,PMS concentration of 200mg/L,Bio-FeMnCeOx dose of 100mg/L when the reaction time were 60min.The results of free radical quenching and EPR identification experiments indicated that the main active species in this system were·SO-4 and 1O2.The cyclic stability experiment showed that Bio-FeMnCeOx had good stability.The degradation efficiency of TC was still as high as 75.71%after 8 times repetition.The results of this study provide a new technology for antibiotic wastewater treatment.
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