Research On The Ferric Oxide Preparation And Adsorption To Pentachlorophenol

Pentachlorophenol (PCP) because of its broad use as bactericide and antiseptic with high toxicity and hardly degradable by ordinary oxidants and most microorganisms in water and soil, is considered as a substance that should be removed from environment.At present, the main approaches to treatment PCP include: biological methods, Fenton reagent, photochemical, electrochemical, ozone treatment, ultrasonic and metal oxidation and so on. These methods all have advantages and disadvantages.The scholars at home and abroad studied a lot on them, but less studied on the the mineral material applied in the wastewater containing PCP . Hematite is a mineral widely occurred on earth surface with high surface area, large adsorptive capacity and high oxidation - reduction activity and can be used as an important adsorbent as well as catalyst for the removal of pollutant in environment. Therefore, study on the mechanism regarding the interaction between hematite and pentachlorophenol is of theoretical and practical importance for understanding the degradation, transfer and removal of pentachlorophenol in water and soil.In this thesis, prepared and load hemate by two methods,choosed PCP to be studied. Studied the interaction between PCP and hemate under different condition. Furthermore, the interaction mechanism of PCP and hemate were also investigated. The main research work as follows:1. Preparated and load the hemate by HTO(situ preparatio) and Ceramic mediums.And characterizated them by XRD, Laman spectrum, SEM and other means of analysis. The results showed that: the hemate preparated by HTO not only has easy preparation and stable character but also has lower lose weight in the anti-acid and alkali ability experiment shockproof test. So it can resolve the difficult problem of absorbent fixed effectively.2. The Static adsorption experiment used to study the adsorption kinetics,adsorption isotherm and the effect by pH between PCP and hematite adsorption.The results showed that: the adsorption and desorption dynamics reach balance at 2.5h,and the adsorption in line with stair kinetic adsorption dynamics; Freundlich adsorption isotherm can describe the adsorption of PCP on hematite better; The pH adsorption isotherm of pentachlorophenol onto hematite is a peak curve and the largest adsorption quantity occurred at about pH 6.0.3. The adsorption of pentachlorophenol on hematite was studied in this laboratory through adsorption experiments and FTIR analysis, the results showed that: the adsorption occurred on the surface of hematite; At pH 6.0, The main interaction between PCP and hematite was static electric interaction; At pH 8.5, the interaction was mainly through hydrogen bond.4. Study on the regeneration of hematite. Used two methods to deal with the hematite after absorbed, the results were that: the ability of hematite regeneration is well, the hematite after adsorption can be Can be fully restored adsorption capacity after burning 600℃for 1 h .The adsorption capacity is 98.9% of first time after rebirth four times.