Study On The Adsorption Of Phenol On Carbon-based Composites Prepared From Furfural Wastewater

With the rapid development of economy,phenol has been widely used as an important chemical raw material in oil refining,coal conversion,petrochemical,pharmaceutical,pesticide and other industries.Phenol is toxic,teratogenic,difficult to degrade,soluble in water and volatile,etc.If discharged into the environment without treatment,wastewater containing phenol seriously threatens human health.At present,the treatment of wastewater containing phenol has become a hot issue in the field of wastewater treatment.In this paper,porous carbon materials were prepared using high concentration furfural wastewater as carbon source.CD/W₁₈O₄₉/Carbon adsorbent with photocatalytic renewable properties were prepared with CD/W₁₈O₄₉ photocatalyst.The study realized the recycling of furfural wastewater,the reduction of the cost of the subsequent treatment of wastewater.The renewable CD/W₁₈O₄₉/Carbon adsorbent showed good adsorption performance on phenol-containing wastewater,and good photocatalytic regeneration performance under the near-infrared irradiation.The conclusions are as follows:?1?high concentration furfural wastewater was selected as carbon source to prepare precursor carbon materials by hydrothermal method.The effects of reaction temperature and reaction time on the yield of precursor carbon materials were investigated.At 200°C and under hydrothermal time of 8h,the maximum yield of precursor carbon material was achieved.The output of carbon in every 30mL of high concentration furfural wastewater reached 2.3641g.Precursors for carbon materials were perforated using KOH activation method.Under 800°C of constant calcination temperature for 1h,the specific surface area of porous carbon materials reached 1308.68m²·g^-1.Fourier transform infrared spectroscopy?ft-ir?characterization results showed that functional groups on the surface of activated samples enhanced the adsorption capacity of porous carbon materials.Scanning electron microscopy?SEM?showed that the surface texture of porous carbon material was loose,with a large number of pores and obvious pore structure.The adsorption properties were tested with with different concentrations of phenol.Optimal adsorption temperature of porous carbon materials was 35°C.The maximum adsorption rate for 500 mg/L of phenol reached 81.2%.The maximum adsorption capacity reached 824.42mg/g.The adsorption kinetics of phenol conformed to the pseudo-secondary adsorption kinetics process,and the adsorption isotherm conformed to the Langmuir equation.?2?CD/W₁₈O₄₉/Carbon renewable adsorbent was prepared using porous carbon materials supported with CD/W₁₈O₄₉ as photocatalysts.Phenol in wastewater was effectively removed and recycled through photocatalytic regeneration.The SEM results showed that the CD/W₁₈O₄₉ and porous carbon adsorbent were successfully compounded,and the CD/W₁₈O₄₉ were evenly distributed in the pores of activated porous carbon spheres.Clear and ordered lattice fringes of W₁₈O₄₉ were observed in the TEM micrograph of the CD/W₁₈O₄₉/Carbon sample,indicating that the CD/W₁₈O₄₉photocatalyst successfully supported on the porous carbon material.The removal efficiency of 500mg/L of phenol for CD/W₁₈O₄₉/Carbon renewable adsorbent reached over 80%.The adsorption kinetics of phenol conformed to pseudo secondary adsorption kinetics,and the adsorption isotherm of phenol conformed to Langmuir equation.CD/W₁₈O₄₉/Carbon was regenerated by photocatalysis.After five regeneration cycles,the adsorption performance loss did not exceed 6%,and the adsorption efficiency of phenol still reached 60%.?3?A flow cycle reactor was built to treat wastewater containing phenol.The adsorption performance of the reactor was tested with 500mg/L of phenol by adding 4g renewable porous carbon adsorbent.The results showed that the adsorption capacity of phenol reached 80%after 1020min of circulation.