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• W2382113765 abstract "The aim of this paper is to explore the feasibility of pyrrhotite as a media for pertechnetate removal from the sewage.To facilitate our experimental work,we have adopted perrhenate as an analogue to pertechnetate,while conducting the batch kinetic tests to analyze and determine the kinetic reduction regulations. In doing so,we have investigated the effects of the various parameters concerned,such as the reducing time,the initial p H,the temperature and the coexistent ions. In our work,we have also used scanning electronic microscope( SEM) and X-ray diffraction( XRD) to trace the surface morphology and determine the composition of the pyrrhotite in its natural state. The results of our experimental work prove that the reductively removal rate of perrhenate( 5 × 10- 5mol / L) can be made up as high as 97% in a period of 80 days. The experimental facts we have gained tell us that the Re( Ⅶ) removal rate tends to increase with the increase of the dosage of pyrrhotite and the reaction time. At the same time,the experimental results we have found out imply that it is possible to improve the ionic strength of the system and facilitate the experiment by adding 0. 1 mol / L Na Cl to the experiment,which proves to have some certain positive effects on the reduction of Re( Ⅶ). What is more,the pseudo-first-order kinetic model we have proposed turns to be able to help to interpret the kinetic data( R2= 0. 9675) in a form of a pseudo first order rate constant( kobs) of 0. 046 3 d- 1at room temperature( 25 ℃) and p H =5. 2. Besides, the temperature proves to have a predominant effect on the removal of pertechnetate. For example,when the temperature is higher than 55 ℃,it would be possible to speed up the removing rate of Re( Ⅶ) with the increase of temperature.The results of the aforementioned experiment have shown that the natural pyrrhotite is endowed with the capability to reductively remove perrhenate( 100 mg / L) from the sewage within 7 days at 80℃ at a superior rate of 98%. At the same time,the p H value also proves to have an obvious influence on the removal rate of perrhenate,which can be removed within 24 hours at p H = 1 absolutely with the p H values from 3 to 8. 5,though it is not obvious with the change of removal rate." @default.
• W2382113765 created "2016-06-24" @default.
• W2382113765 creator A5001925327 @default.
• W2382113765 date "2015-01-01" @default.
• W2382113765 modified "2023-09-26" @default.
• W2382113765 title "On the reduction-immobilization function of rhenium and its influential factors via pyrrhotite" @default.
• W2382113765 hasPublicationYear "2015" @default.
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