Study On The Degradation Of Tetracycline Using Activation Of Peroxymonosulfate By Leather Waste Biochar

Biochar based peroxymonosulfate activation technology is a green and sustainable technology for the removal of organic pollutants in water.In this study,biochar was prepared from waste leather,and its composition,activation mechanism and anti-interference ability were evaluated in detail.The feasibility of removing tetracycline from water by magnetic leather biochar was investigated,and the main active groups and activation mechanism of PMS activated by magnetic leather biochar were discussed.Before assessing the function of magnetic leather biochar,the prepared materials were characterized.The results showed that the original leather-based biochar had a layered structure,smooth surface,and mainly contained C,H and O elements.The N element contained in the original leather was also retained after pyrolysis.The loading of Fe₃O₄ resulted in a tremendous improvement in surface area and pore structure,and the original surface functional groups of BC are basically not affected.The results of biochar assessing showed that the adsorption capacity and PMS activation capacity of BC were improved after Fe₃O₄ loading on the surface of BC.When the concentration of magnetic biochar is 200 mg/L and the concentration of PMS is 2 m M,the catalytic system shoes a satisfied degradation efficiency,and the removal of TC can reach about 90%within 120min.When the system is used to remove TC with low polluted concentration,the reaction speed is faster,and the complete degradation of tetracycline can be basically achieved,reaching above 99%.Based on the understanding of the degradation of TC by MBC/PMS system,the anti-interference ability of the reaction system was evaluated and its practical application potential was studied.The results show that the MBC/PMS system has a wide range of p H adaptation capability and can achieve rapid degradation of TC in the range of 3-9,and the MBC/PMS system is less disturbed by background anions such as NO₃^-,Cl^-and SO₄^2-.Due to the low leaching amount of Fe,the material can still maintain a high activation effect after multiple repeated recycling.In the activation mechanism exploration experiment,it was found that MBC/PMS system could degrade TC in a variety of ways,and the dominant role was through singlet oxygen oxidation,which is generated through the surface ketone group.Meanwhile,as auxiliary free radicals,SO₄^·-and·OH also participate in the degradation process of TC.The direct electron transfer pathway also has an important effect on TC degradation in water.In this study,the feasibility of preparing magnetic BC from cheap,easy to obtain and not easy to degrade leather for PMS activation was discussed,and its main mechanism was understood,which provided theoretical reference for the reuse of solid waste.