磁性生物炭活化过一硫酸盐对环丙沙星的降解及机理研究

Peroxymonosulfate Activation and Mechanism of Magnetic Biochar for the Degradation of Ciprofloxacin

以榴莲壳为原料,采用高温热解法制成磁性生物炭(magnetic biochar,MBC),以MBC作为活化剂对过一硫酸盐(peroxymonosulfate,PMS)进行活化从而降解水中的环丙沙星(ciprofloxacin,CIP),并对其去除效果及机理进行讨论和研究。实验结果表明:MBC_(800)可以活化PMS,达到很好的降解效果,当MBC投加量为0.5 g/L、PMS浓度为0.25 g/L、降解时间为60 min时,对CIP的降解率可达到93.43%。适用pH为5.0~9.0,温度对降解效果影响较小,部分共存阴离子对降解有抑制效果。淬灭剂实验结果表明,MBC在活化PMS降解CIP的过程中,O_(2)^(-)·和^(1)O_(2)起主要作用。MBC在经过3次循环后仍有60.42%的降解率,表明其具有一定的可重复利用性和稳定性。

In this paper,magnetic biocharcoal(MBC)is made from durian shell and high-temperature pyrolysis.MBC is used as an activator to activate a sulfate(PMS)to degrade ciprofloxacin(CIP)in water,and its removal effect and mechanism are discussed and studied.Experimental results show that MBC_(800) can activate PMS to achieve a good degradation effect.When the addition of MBC is 0.5 g/L,the PMS concentration is 0.25 g/L,and the degradation time is 60 min,the degradation rate of CIP can reach 93.43%.The applicable pH range is 5.0~9.0,the temperature has little impact on the degradation effect,and some coexisting anions have an inhibitory effect on degradation.The results of the quenching agent test show that O_(2)^(-)· and ^(1)O_(2) play a major role in activating PMS to degrade CIP.MBC still has a degradation rate of 60.42% after three cycles,indicating that it has a certain degree of reusability and stability.