Research The Adsorption Performance Of Forestry Waste For Pollutant In The Water

In the dissertation, the adsorption performance of Cu(Ⅱ), pb(Ⅱ), aniline andprotein in the water was researched by midified forestry waste which were poplarleaves and koelreuteria paniculata shell.The influence of factors which were temperature of modification, dosage andconcentration of modifier and time of modification was experimented, and the bestcondition of modification was determined in this dissertation.In the experiment of adsorption, the condition of static and dynamic adsorptionexperiment was researched, and the influence of factors which were adsorptiontemperature, adsorption time, pH, the height of adsorption column, concentration andflow velocity of pollutant was experimented. In the experiment of desorption, thecondition of desorption experiment was researched, and the influence of factors whichwere desorption temperature, desorption time and pH.Heavy metal ions were adsorbed by poplar leaves which were modified withNaCl. The experiment showed that the adsorption rate of100mg/L Cu(Ⅱ) reached82%with0.3g modified poplar leaves, and the adsorption capacity reached13.7mg/g. The adsorption rate increased by more than18%and the adsorption capacityincreased by more than3mg/g compared with before modified. The adsorption rate of500mg/L pb(Ⅱ) reached64%with0.1g modified poplar leaves, and the adsorptioncapacity reached160.7mg/g. The adsorption rate increased by more than12%and theadsorption capacity increased by more than31mg/g compared with before modified.The thermodynamic analysis showed that the adsorption behavior of Cu(Ⅱ) was betterfit Langmuir isothermal equation, and the adsorption behavior of pb(Ⅱ) was better fitFreundich isothermal equation. The adsorption behavior of Cu(Ⅱ) and pb(Ⅱ) wereboth spontaneous, disordered, exothermic physical adsorption process. The kineticsanalysis showed that the adsorption process of Cu(Ⅱ) and pb(Ⅱ) were both fit second-order kinetics, which was finished quickly under the room temperature. Thedesorption experiment showed that the desorption rate reached more than95%with0.05mol/L HCl under25℃.Aniline was adsorbed by koelreuteria paniculata shell which was modified withHNO3. The experiment showed that the adsorption rate of120mg/L aniline reached82%with0.3g modified koelreuteria paniculata shell, and the adsorption capacityreached16.5mg/g. The adsorption rate increased by more than45%and theadsorption capacity increased by more than9mg/g compared with before modified.The thermodynamic analysis showed that the adsorption behavior of aniline wasbetter fit Freundich isothermal equation, which was spontaneous, disordered,exothermic physical adsorption process. The kinetics analysis showed that theadsorption process of aniline was fit second-order kinetics, which was finishedquickly under the room temperature.The experiment of dynamic adsorption showed that the height of adsorptioncolumn, concentration and flow velocity of aniline had a great influence on thepenetration time. With the height of modified koelreuteria paniculata shell columnincreased, the penetration time was increased, and with the concentration and flowvelocity of aniline increased, the penetration time reduced. The BDST model couldwell describe the relationship of modified koelreuteria paniculata shell column andpenetration time, and forecast the penetration time when only the concentration orflow velocity of aniline was changed. The Thomas model could well describe theadsorption kinetics of aniline, and forecast the dynamic adsorption capacity of aniline.Protein was adsorbed by koelreuteria paniculata shell which was modified witharsenazo I. The experiment showed that the adsorption rate of80mg/L proteinreached98%with0.2g modified koelreuteria paniculata shell, and the adsorptioncapacity reached19.6mg/g. The adsorption rate increased by more than41%and theadsorption capacity increased by more than8mg/g compared with before modified.The thermodynamic analysis showed that the adsorption behavior of aniline wasbetter fit Freundich isothermal equation, which was spontaneous, ordered, exothermicchemical adsorption process. The kinetics analysis showed that the adsorption process of aniline was fit second-order kinetics, which was finished quickly under the roomtemperature.