Waste Cigarette Butts Derived Fe~0/C Composites With Their Application In The Remediation Of Trichloroethylene

Trichloroethylene as a typical chlorinated organic contaminant of groundwater,mayexist in environment for a long time,also its neurotoxicity and potentially carcinogenic threaten irreparable injury to health.Currently groundwater remediation technology consisted physical repair technology,bioremediation,permeable reactive barrier,in-situ reduction zone etc..Comparison among various technologies,remediation of trichloroethylene were mostly adopted the last one above.Zero-valent iron is the mainly functional materials for in-situ reaction zone,its modification is the key to the smooth implementation.But the cost enhanced due to the majority complex process and macromolecule raw material adopted frequently.Therefore,the purpose of this article is to prepare the Fe~0/C composites which have a simple technology and excellented performance simultaneously.Cigarette butts as carbon source for one step of carbon thermal Fe~0/C composites,which applied to trichloroethylene degradation.This method could solve the problem of solid waste management and environmental remediation as well.Fe~0/C composites are characterized by SEM,XRD,physical adsorption,elemental analysis methods.The Fe Cl3(1.3)(composites with initial 1.3 g ferric chloride,2.5 g cigarette butts)specific surface area is 780 m2/g,in degradation of trichloroethylene saturated concentration of aqueous solution,shows the removal rate reaches 98% within 120 h,fits to the pseudo-first-order kinetics,the fastest reaction rate is 0.02604 h-1.Sorting the degradation effects among p H 5 ~ 9 trichloroethylene solution show that acidic aqueous sustains higher degree of degradation than alkaline.From the perspective of practical application,aging tests and transport efficiency of the particles were studied,both results support that the composites have a good application prospects.Further more,in order to research the different component of Fe~0/C composites corresponding to regular results,we design the batch experiments carbon contents variation range 75% ~ 33% for the results that the optimal content.Through composites characterization,dynamics analysis and the reaction process all demonstrated that the carbon proportion for the Fe~0/C composites plays a key role in trichloroethylene degradation reaction,composites with 67% carbon content could have the fastest reaction rate is 0.02604 h-1,the degradation rate is above 98% within 120 h.