Adsorption Of Phenols In Water By Mesoporous Carbon And Its Fe-modified Materials

With the rapid development of industry and agriculture,the problem of the environment pollution by large mounts of various pollutants during the production process has appeared.Some phenolic compounds are listed as priority pollutants in many countries because of their highly toxic and refractory properties,they become the one of the key targets for environmental pollution control.In the common water treatment technology,adsorption method is easy to realize wide application because of it's simple and effective.Based on the advantage of mesoporous carbon materials applicated as Adsorbent and carrier,and the high activity of Fe particles,mesoporous carbon materials and iron modified mesoporous carbon materials were preparedand applied in adsorb bisphenol A?BPA?and p-nitrophenol?p-NP?in simulated wastewater.Using resorcinol and formaldehyde as precursors of carbon precursors and F127 as template to prepare carbon materials to the three kinds of proportion of phenol and template by hydro-thermal synthesis method.Selecting MC through Nitrogen adsorption-desorption test and Fe-modified it with the iron source of Fe?NO₃?₃.9H₂O by one-step method,to prepare iron modified mesoporous carbon materials to three proportion of Fe and phenol of 0.5,1,and1.5.their textural properties were characterized,respectively.The aperture of mesoporous carbon and iron modified mesoporous carbon materials is homogeneous which concentrated in 3-4nm,the calculated surface area are 643.6,635.6,636,587.2m²/g of mesoporous carbon and it's Fe-modified materials,Theiron isexistenced as zero valence state,Using mesoporous carbon and it's Fe-modified materials as adsorbents,through the investigation of adsorbent dosage,initial concentration,adsorption temperature,time factor and adsorption isotherm,the rmodynamics and kinetics to study their adsorption properties of BPA and p-NP in water,and then test the desorption-readsorption cycle experiment.The experimental results showed that:?1?mesoporous carbon and it's Fe-modified materials had a positive correlation with the removal rate of BPA and p-NP and the dosage of adsorbent.The equilibrium adsorption capacity was negatively correlated with the dosage of adsorbent,and positively correlated with initial concentration,and negatively correlated with temperature.Under the experimental conditions,the adsorption of mesoporous carbon on BPA and p-NP was 253 and145.7mg/g,Fe-modified materials'adsorption capacity is higher than mesoporous carbon,the maximum adsorption capacity and removal rate are 451.6 mg/g and 78.7%by use 10mg iron modified mesoporous carbon materials to adsorb 100mg/L BPA under 25?,220.4mg/g and92.3%by use 25mg iron modified mesoporous carbon materials to adsorb 20mg/L P-NP,respectively.?2?The adsorption process of BPA and p-NP on each adsorbent are better fitted with Freundlich isothermal model,but p-NP can also better fit the Langmuir model at high temperature.Sorption of BPA and p-NP by each adsorbent are preferential adsorption.The adsorption reaction of mesoporous carbon and it's Fe-modified materials to BPA and p-NP are exothermic process,which can be carried out spontaneously,mainly by physical adsorption.There arealso chemically adsorbed inadsorption process of iron modified mesoporous carbon materials to BPA.?3?When mesoporous carbon and it's Fe-modified materials adsorbed BPA,the equilibrium time reached 15-20 min.When p-NP was adsorbed,the adsorption equilibrium time of mesoporous carbon was 100 min,and iron modified mesoporous carbon materials was60min.The adsorption data of BPA and p-NP on four kinds of adsorbents are in accordance with the pseudo-second kinetic model.?4?The desorption-readsorption process of mesoporous carbon and iron modified mesoporous carbon materials that adsorbed BPA and p-NP arereached 3 timesby use anhydrous ethanol respectively.The removal rate of four adsorbents to BPA decreased by about 10%each time,top-NP was about 20%.