Study On Preparation Of Adsorbent By Pyrolysis Of Solid Waste

With the growth of Chinese economic strength and the increase in consumption levels,solid waste is increasing day by day.From the analysis of the relationship between solid waste and the environment,resources and society,solid waste is polluting,resourceful and social.How to treat solid waste into resources has always been the focus of attention of enterprises and governments.Coal tar(CT)is a waste residue produced during the refining industry.It is mainly a mixture of phenols,aromatic hydrocarbons and heterocyclic compounds.Most companies do not achieve good treatment of coal tar residues.In order to realize the resource treatment of CT,CT and corn straw(CS)can be co-pyrolyzed to prepare adsorbents for the treatment of p-nitrophenol(PNP)wastewater.Oily sludge(OS)is a waste residue generated in the preparation of catalyst industry.At present,the treatment of OS is simply piled up or directly discarded.Studies have found that OS can be used to prepare iron-carbon catalysts through pyrolysis.Fenton reaction with H2O2 is effective for the treatment of dye wastewater.This article takes CT and OS as research objectives,discusses how to realize resource management based on the different characteristics of solid waste,and pyrolysis technology was used to prepare with different functions in a slide-rail electric furnace.Elemental analysis,industrial analysis and thermogravimetric analysis(TGA-DTG)of raw materials.Organic functional group analysis of pyrolysis products using Fourier transform infrared spectroscopy(FTIR),pyrolysis of solid surface properties such as Raman analysis(Raman),scanning electron microscopy(SEM)for surface morphology analysis and surface inorganic composition analysis,X-ray fluorescence spectroscopy(XRF)is used to analyze the main element composition and content,X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)are combined to analyze important elements in pyrolysis solids and forms of existence.Ultraviolet spectrophotometer(UV)was used to detect the concentration of simulated wastewater solution.The results are as follows:(1)The experiment of co-pyrolysis of CT and CS using single factor and response surface method to explore the best experimental conditions for co-pyrolysis is a pyrolysis temperature of 400?,pyrolysis time of 20 min,and CT to CS mass mixing ratio of 1:1,obtain RMC under the best experimental conditions.In order to further improve the adsorption characteristics of adsorbent,the prepared adsorbent was modified by impregnation with iron solution and zinc solution,and Fe3+ and Zn2+ were respectively supported on the surface of pyrolysis char to obtain modified char Fe-RMC and Zn-RMC.The three char were used in p-nitrophenol wastewater.The adsorption capacities of RMC,Fe-RMC and Zn-RMC were 59.01 mg/g,140.23 mg/g and 121.35 mg/g,respectively.(2)OS prepares iron-carbon catalyst OSC-800 through high-temperature pyrolysis.OSC-800 not only contains a large amount of Fe element,but the manifestation form of Fe is mainly Fe3O4.Pyrolysis also caused surface pores to be formed in OSC-800.Heterogeneous catalysts were used for the removal of three different dyes(Sunset Yellow,Crystal Violet and Methylene Blue).It was found that the heterogeneous catalysts had a Fenton reaction with H2O2.The removal of all three dyes had obvious effects.0.05 g OSC-800,0.5 ml H2O2 adsorption capacity at pH 2 are 83.61 mg/g,679.19 mg/g and 514.25 mg/g.