The Research Of Biomass Adsorbing Acid Fuchsin

At present, the dye wastewater had a serious pollution and it had a direct threat to the human production and life. So the dye wastewater treatment had been the focus research in the field of environmental science and engineering. In this paper, peanut shells, wheat straws, rice straws and corn straws were used as biomass raw materials to absorb acid fuchsin. There were four kinds of way (crushing, carbonization, modification, carbonization and modification) was used to deal with the raw materials. Under the condition of best single factors, combining with dynamics model, Isothermal adsorption model and thermodynamics model to analysis the adsorption mechanism.(1) Study on the adsorption of acidic with biomassPeanut shells, wheat straws, rice straws and corn straws adsorbing acid fuchsin balance when the pH were1,2,1,2and the time were8h,8h,8h,12h, The best dosing quantity was0.6g, In0.1to0.3mol/L NaCl concentration range, ionic strength error was between12.33%-15.99%; Under the best condition, the behavior of raw biomass materials adsorbing acid fuchsin meet first-order kinetics model, fitting correlation coefficient R2was0.990,0.974,0.869,0.925, and the adsorption rate constant k1were between0.176-0.339; Bring the test data into model, the results showed that the fitting correlation of Langmuir model, Freundlich model and Tempkin model were quit good when the temperature was283K、303K、323K in part, correlation coefficients were reached above0.900, according to the Langmuir theory, under the condition of normal temperature (10℃), the adsorption theory of four kinds of biomass material quantity were21.592mg/g, respectively,11.524mg/g and8.119mg/g and24.399mg/g; Adsorption thermodynamics study results showed that the biomass material of acid fuchsin adsorption was a spontaneous and exothermic process.(2) Study on the adsorption of acidic with carbonized materialsPeanut shells carbon, wheat straws carbon, rice straws carbon and corn straws carbon adsorbing acid fuchsin balance when the pH were1,1,2,2and the time were10h,10h,8h,10h, The best dosing quantity was0.3g, In0.1to0.3mol/L NaCl concentration range, ionic strength error was between6.78%-12.47%;750℃carbonized materials adsorb acid fuchsin in the condition of best factors, four types of carbide material for adsorption of acid fuchsin was in line with the quasi secondary dynamics, the fitting correlation coefficient R2were0.993,0.995,0.974,0.956, and the adsorption rate k2was between0.013-0.046; Isothermal adsorption results indicated that, with the adsorption of acid fuchsin on four types of carbide material was given priority to with multilayer adsorption, isothermal adsorption mainly accorded with the Freundlich equation and Tempkin equation; Adsorption thermodynamics research results show that the biomass carbon materials of acid fuchsin adsorption was a spontaneous and endothermic process.(3) Study on the adsorption of acidic with modified materialsThe modified materials were perpetrated with using ZnCl2as modified agents, and microwave was used to activate the adsorbent. Modified peanut shells, modified wheat straws, modified rice straws and modified corn straws adsorbing acid fuchsin balance when the pH were1,1,1,2and the time were12h,12h,10h,12h, The best dosing quantity was0.1g, In0.1to0.3mol/L NaCl concentration range, ionic strength error was between8.48-12.11%; The results showed that a modified material was multilayer adsorption, and Isothermal adsorption main accord with Freundlich model and Tempkin model; the three dynamics models in this study all can describe the modified wheat and rice straws’ adsorption behavior, modified peanut shells and modified corn straws meet both first-order and second-order kinetics equation, The dynamics parameters indicated that this modified way improved the adsorption ability of wheat straws and rice straws a lot. Adsorption thermodynamics study results showed that the biomass material of acid fuchsin adsorption was a spontaneous and exothermic process.(4) Study on the adsorption of acidic with modified carbonized materialsThe450℃biomass carbon was modified by1mol/L H3PO4, which were used as adsorbent to deal with acid fuchsin. Modified peanut shells carbon, modified wheat straws carbon, modified rice straws carbon and modified corn straws carbon adsorbing acid fuchsin balance when the pH were1,1,1,1and the time were6h,6h,8h,6h, The best dosing quantity was0.1g, in0.1to0.3mol/L NaCl concentration range, ionic strength error was between7.26%-11.83%; The dynamics showed a consistent trend, second-order kinetics equation was suitable, fitting correlation were above0.972, the adsorption rate constant k2was between0.017to0.030; The results showed that modified biomass carbon presented different adsorption characteristics in low temperature condition. When the temperature was323K, multilayer adsorption was the main adsorption behavior, Isothermal adsorption meet Freundlich model and Tempkin model; Adsorption thermodynamics research results showed that the biomass carbon materials of acid fuchsin adsorption are a spontaneous and endothermic process.