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Preparation Of Palygorskite/γ-Fe2O3/Carbon And Adsorption Removal Of Phenol From Aqueous System

Posted on:2010-06-07Degree:MasterType:Thesis
Country:ChinaCandidate:H SongFull Text:PDF
GTID:2121360275478031Subject:Environmental Science
Abstract/Summary:PDF Full Text Request
Using the special crystal form, excellent absorption properties, surface chemical activity, as well as crystal nucleation and growth control of attapulgite, through molysite hydrolysis and heat treatment, hematite and magnetic nano-carbon load in the surface of it; by controlling the composition and the size of palygorskite/γFe2O3 / carbon composites, control size distribution and performance, prepared a superparamagnetic iron, excellent absorption properties of low-cost multi-functional nanocomposites. In order to through the action of modified attapulgite'high adsorption and magnetic separation to remove the trace organic pollutants and suspended solids that dissolved in the water. using the superparamagnetic characteristic to achieve magnetic recovery of adsorbent; through biodegradable absorbent to achieve regeneration, solving the absorbent clay minerals solid-liquid separation and recycling problem.Simulate to using each kind of attribute technology to research the influence of the compound materials'preparation method and condition which affects on the composition, the microstructure, the surface properties, the adsorption performance, magnetism characteristic as well as the effect of magnetism separation, the biology - mineral correlation that pollutants affect on the adsorption performance, mechanism and absorbent regeneration of the compound materials. The results suggested that the nanocomposite could be subsequently removed from the water by a simple magnetic procedure. The magnetic iron oxides in the form ofγ-Fe2O3 were loaded onto the surface of the palygorskite, with particle diameter from 10 to 60 nm. The carbon in the form of amorphous was loaded onto palygorskite crystal surface and the content of carbon in the composite material was 7.4%. Furthermore, functional group -CH3, -CH2- and -C=O were found in the nanocomposite material. The efficiency of composite material for phenol removal was three times higher than that of palygorskite, which was suggested by the adsorption comparative test. Over the temperature range of 298k-328k, the thermodynamics parameters including Gibb's free energy changes (ΔG), enthalpy(ΔH), and entropy changes (ΔS) were : -20.35(kJ/mol), 71.88 (J/K·mol) respondingly. These indicates that adsorption thermodynamics of phone on palygorskite/γFe2O3 / carbon nanocomposite materials were a spontaneous and exothermic process. The achievement has the important meaning on water advanced treatment and potable water safety control technology, also in study of environment mineralogy, environment geochemistry ,Geological microbiology, environment engineering and so on.
Keywords/Search Tags:Palygorskite, spent bleaching earth, magnetic extracted adsorbents, nanometer composite
PDF Full Text Request
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