Preparation Of 3D Microspheres From Waste Cotton Fabric And Application Of Antibiotic Degradation

With rapid development of economy and living standards,the annual abandoned cotton fabric is extensive.However,traditional recycling ways of cotton fabric often cause serious environmental pollution and resource waste.Therefore,it is imperative to develop a new method to make waste cotton fabric being highly utilization.Because of rich carbon components,waste cotton fabric could be transformed to carbon products through high temperature carbonization,so as to enhance its value.Carbon materials as heterogeneous fenton catalyst support have been widely studied.In the research field of heterogeneous fenton catalyst,common way to load metal ions in carbon materials was impregnation.This method often lead to low dispersion of metal ions in carbon material catalysts and low catalytic performance.In addition,the carbon catalyst prepared by this method was usually in powder form,which would greatly limit usage and recovery.In this study,a new preparation idea of heterogeneous fenton catalyst was proposed.Waste cotton fabric was raw material,controllable macro-structure of carbon material was realized by cellulose properties of dissoluble and reproducible.At the same time,cellulose component and FeCl₃ were mixed in N,N-dimethyl acetamide/lithium chloride（DMAc/LiCl）solvent to achieve highly dispersed Fe load in the catalyst.In this way,catalytic performance of heterogeneous fenton catalysis was improved.The specific research content is as follows:（1）Heterogeneous fenton catalyst（Fe/Fe₃C@3DMES）with 3D network structure was prepared by solution-blending of cellulose and Fe³⁺.Physicochemical functional characteristics of the catalyst were studied by a series of characterization and experimental methods.The characterization results showed that Fe⁰ and Fe₃C were successfully synthesized by carbothermic reduction reaction between rich carbon components of cellulose and Fe³⁺under high temperature and nitrogen laden environment.As for function of Fe/Fe₃C@3DMES catalyst,results showed the removal rate of ofloxacin（OFL）in water was 100%within 40min,and the catalyst was suitable for efficient removal of six kinds of refractory organic compounds.Besides,the catalyst own excellent oxidation resistance and recycling performance.（2）In the process of preparing Fe/Fe₃C@3DMES catalyst from waste cotton fabric,catalytic performance might be affected by different conditions,so the influence of preparation conditions on the performance of the catalyst was studied.The experimental results showed that the change of heating temperature,dissolution time and raw material dosage during DMAc/LiCl dissolution of waste cotton fabric could regulate cellulose concentration in homogeneous cellulose DMAc/LiCl solution,and further changed the proportion of iron content in catalyst,thus affecting catalytic performance.In addition,in the application study of ofloxacin removal,it was found that the 3D network structure of catalyst provided a large specific surface area（311.3m²/g）,which promoted mesoporous structure formation and enriched pore structure.Besides,in the process of OFL degradation reaction,the adsorption by catalyst improved removal efficiency.In conclusion,this study proposed a new way to prepare heterogeneous fenton catalyst from waste cotton fabric,which could effectively reshape fiber structure,so that Fe/Fe₃C@3DMES had a stable 3D network structure and excellent catalytic performance.