Removal Of CIP From Water And Sediment By CMC Stabilized Fe-Mn Binary Oxide Nanoparticles

With the development of the pharmaceutical industry,animal husbandry and economy,the pollution of antibiotics has become more and more badly and must be solved quickly.Ciprofloxacin(CIP)has been used worldwide in a variety of human and veterinary applications because of its strong antibacterial activity.The abuse of CIP exposed to the environment over a long period of time will bring many threats to humans.It is said that CIP can cause anaphylaxis,oral inflammation,leukocytopenia,damaging to the liver and kidney,even the toxicity of the nervous system and the digestive system,which directly endangers human health.Thus,it is necessary to remove CIP contaminants from environment before being released into the water and soil.Adsorption is seemd to be one of the most effective ways to remove CIP from wastewater because of its low cost,simple operation,high efficiency and simple regeneration.Conventional adsorbents such as activated carbon and its modified materials,natural minerals,graphene oxide,etc have the disadvantage of low efficiency and can not be applied to soil remediation.Therefore,it is urgently to develop new and efficient adsorbents to overcome the defects of conventional adsorbents.The stabilized Fe-Mn binary oxide nanoparticles has an important effect on the transfer and transformation of CIP in water and soil since it shows many surface active functional groups and strong redox activity,excellent adsorption capacity,affinity toward target contaminants stabilization and decent soil deliverability.Based on the unique physical and chemical properties of the stabilized Fe-Mn binary oxide nanoparticles,it was mostly used as an efficient material to remove organic pollutants or trace pollutants in the environment.In this study,CMC stabilized Fe-Mn binary oxide nanoparticles(CMC-FMBO)were prepared by co-precipitation.The overall goal of this research was to investigate the effectiveness of CMC-FMBO for removing CIP from water and sediment.CMC-FMBO was characterized by Transmission electron microscopy(TEM),Fourier transform infrared(FTIR)and Zeta potential.When compared with non-stabilized Fe-Mn nanoparticles(FMBO),CMC-stabilized Fe-Mn nanoparticles(CMC-FMBO)showed relatively more favorable removal performance and particles stabilization facilitated delivering nanoparticles into sediment for in situ removal of CIP.The CIP removal by CMC-FMBO was highly pH dependent and the optimum pH was 6.0 with the maximum capacity of 1172.25mg/g.A pseudo-second-order kinetic model was able to interpret the removal kinetics,and the removal rate of CIP was affected by film diffusion and intraparticle diffusion.The removal CIP by CMC-FMBO was influenced by ionic strength and background electrolytes.The existence of the ionic strength anmonovalent ions will enhance the decontamination CIP.But the polyvalent ions will cause inhibitory effect on CIP removal,and the higher the valence state is,the stronger the inhibitory effect is.The decontamination CIP by CMC-FMBO was influenced by ionic strength and background electrolytes.When CIP-spiked sediment was treated with the CMC-FMBO,CMC-FMBO exhibited more excellent resistance to the sediment inhibitive effects and higher removal efficiency of CIP,compared to FMBO.This primary research suggests that CMC-FMBO hold the potential for facilitating removal of emerging contaminants in wastewater and sediment.