Preparation Of Carboxymethyl Level Cellulose Sodium Stabilized Nano-iron And Remediation Of Chrome-contaminated Soil

As domestic industrial production and rapid economic development and thus caused serious environmental pollution,and chromium is widely used in industrial activity causes soil chromium pollution problem is particularly prominent.Compared with traditional repair materials,nano-iron materials have been widely used in environmental treatment and achieved remarkable results due to their special properties such as large specific surface area and high activity.,has been widely used in environmental governance and significant results have been achieved.Despite its performance in a good performance,but it still has some deficiency.So this article optimize the preparation method of liquid phase reduction,stable nanometer iron under different environmental factors on soil solution the reduction effect of hexavalent chromium,finally to explore the stability of nanometer iron on the actual effect of the repair of industrial pollution of soil and its effect on the change of soil cr form.To stabilize the nanometer iron which provides the theoretical foundation in the practical engineering application.Through studying the optimization conditions of preparation of stable nanometer iron,it is concluded that the quality ratio of 0.8% sodium carboxymethyl cellulose stable nanometer iron has high resistance to oxidation and reduction performance.Characterization results show that the stability of sodium carboxymethyl cellulose iron nanoparticles morphology structure is ?-Fe0 crystal,and the average particle size of 92.66 nm,X-ray photoelectron spectroscopy illustrate the preparation of nanometer iron surface layer of the iron oxide film,its performance for the oxidation of core-shell structure sphere particles.Under different conditions of reaction system for sodium carboxymethyl cellulose stable nanometer iron reduction effect of hexavalent chromium contaminated soil,the result show that stable nanometer hexavalent chromium iron reduction of soil in a certain period of time are in line with the pseudo first-order reaction kinetics.Affect the reaction rate constant Kobs have stable nanometer iron dosing quantity,system of p H,soil initial concentration of hexavalent chromium,humic acid concentration and reaction temperature.Reaction rate constant Kobs as stable nanometer iron dosing amount and the reaction temperature increases gradually;PH,soil hexavalent chromium as system system decreases with the increasing of initial concentration and the concentration of humic acid.Through experiments and Arrhenius equation,the reaction activation energy Ea was calculated to be 52.91 k J/mol,show that stable nanometer iron hexavalent chromium in soil system is easy to occur the reduction reaction.Using stable nano-iron to repair industrial chromium contaminated soil,the research results show that the p H value of the soil increases after the stable nano-iron is repaired;After 15 days of remediation,the content of hexavalent chromium in the two different contaminated soils decreased significantly below the screening value.Almost all exchangeable chromium in the soil was transformed into Fe-Mn oxide binding state and residue state,and with the continuous growth of time,the occurrence form of chromium in each soil gradually changed into residue state.