Synthesis Of Ordered Fe-containing Mesoporous Carbon Materials And Its Adsorption Of Organic Pollutants In Water

In this work, we prepared ordered mesoporous carbon containing iron (Fe/OMC) materials by soft-temple method and reported it’s adsorption of typical organic pollutants from aqueous solution. Fe/OMC were synthesized via soft-template routes, using phenol-formaldehyde resol (PF) polymerized as carbon precursor, triblock copolymer F127as template agent, inorganic iron salts ferric nitrate as metal precursor in one pot. The products were characterized by X-ray diffraction (XRD), N2adsorption/desorption, transmission electron microscopy (TEM) and fourier transform infrared spectrometer(FTIR). The adsorption performance of chlorophenol (4-CP) and cephalexin (CEX) from aqueous solution onto OMC and Fe/OMC were inwestegated. Effects of pH values, adsorption temperature and adsorbents dosages were studied to determine the best preparation conditions. The kinetics and thermodynamic models were applied to analyze the mechanism and quantify the sorption parameters. The result obtained from FTIR confirmed that the introduction of iron species can effectively promote the adsorption of4-CP on the OMC, and the reusability of Fe/OMC had also been researched. The conclusions are summarized as follows.1. Characterization results revealed that the Fe/OMC composite, which was synthesized via soft-template routes, possessed ordered two-dimension hexagonal mesoporous structureand. The surface area area was644m2g-1. The nanometal iron dispersed well on the matrix of carbon and ion species exited in α-Fe0state, so the Fe/OMC composite material having a good magnetic separation performance.2. In the initial concentration of4-CP is120mg/L, adsorbent dosage is0.7g/L conditions, the removal rate of Fe/OMC to4-CP was about twice than OMC, which is due to the introducing of iron could promote the adsorption process. The adsorbent patterns were fitted by Langmuir adsorption isotherm than Frendlich adsorption isotherm. And kinetics were well described by the pseudo-second-order model than the pseudo-first-order model. It was clear that regeneration using acetonitrile solution showed better reusability compared to sodium hydroxide solution.3. In the initial concentration of CEX is20mg/L, adsorbent dosage is0.5g/L conditions, the removal efficiency of Fe/OMC to CEX was97.7%, which was much higher than that of OMC, It is because that CEX’s many functional groups may form many coordination bonds with iron. Kinetic and equilibrium adsorption data showed that the adsorption of CEX over Fe/OMC obeys to the pseudo-second order kinetic equation and Langmuir adsorption isotherm. Moreover, the Fe/OMC adsorbent exhibited high stability in four consecutive absorption-desorption cycles. The results provide useful theoretical basis for the potential applications of Fe/OMC in commercial adsorptions.