The Preparation Of Amino Bonded Bagasse Cellulose And Its Adsorption For Copper(?) And Chromium(?) Research

Used bagasse as raw materials to purify cellulose,then made cellulose into dialdehyde cellulose by selective oxidation, and reacted with triethylene tetramine based on schiff reaction to make triethylene tetramine bagasse cellulose adsorbent, Characterized the structure of bagasse,cellulose and triethylene tetramine cellulose using FTIR, XRD and SEM. Based triethylene tetramine bagasse cellulose as adsorbent studied the single and mixed ions adsorption sistem for Cu2 + and Cr6 +.1.In order to obtain higher bagasse cellulose concentration and increase the surface area of fiber after pretreatment, on the basis of conventional alkali pretreatment by adding anhydrous sodium sulfite and using dilute nitric acid pretreatment method, to improve the conditions of purification and separation technology of bagasse cellulose, bagasse cellulose samples was characterized using FTIR, SEM and BET nitrogen adsorption specific surface area instrument. Result showed that when the concentration of nitric acid was 0.12 g/m L, the mass fraction of NaOH was 2.5%, the reaction temperature in acid and alkali treatment process was 80 ?and reaction time was 3 h, the mass ratio of anhydrous sodium sulfite and the bagasse was 1:6,cellulose content in the sample after the treatment process was up to 91.49%; after the treatment, bagasse samples,structure was loose and rough, significantly increase the accessibility and specific surface area of cellulose,after the determination of BET, the specific surface area was increased to 1.713 times.2.The best preparation conditions of dialdehyde cellulose: the reaction temperature of oxidation reaction process was 35?, reaction time was 7h, the pH of solution was 3,the ratio of quality of sodium periodate and cellulose was 2:1, aldehyde maximum content was tendency for 1.50 mmol/ g.The removal rate of adsorption of dialdehyde cellulose for copper ion and hexavalent chromium ion reached the maximum respectively was 87.41% and 91.40%. The experimental results showed that the removal rate of adsorption of dialdehyde cellulose for copper ion and hexavalent chromium ion change with aldehyde content, the copper ions and hexavalent chromium ion removal rate increased as the aldehyde content increased,this was said that aldehyde contenthad great influence on the removal rate. Element analysis result showed that C in the mass fraction of triethylene tetramine cellulose was 38.23%, H mass fraction was 5.73%, N mass fraction was 1.33%, this was dialdehyde cellulose reacted with triethylene tetramine, amino was introduced successfully3.triethylene tetramine bagasse cellulose adsorbent adsorped Cu(?)and Cr(?), the adsorption process was in line with the Langmuir isotherm adsorption model and quasi secondary adsorption kinetics model,triethylene tetramine bagasse cellulose saturated adsorption of Cu(?)and Cr(?) respectively were 119.62 mg/g and 10.86 mg/g in the scope of the initial experiment temperature and solution concentration. DG all were negative, base on the experimental conditions,adsorption reaction for Cu(?) and Cr(?) all can occurred spontaneously, DH all were negative, based on the experimental conditions,adsorption reaction for Cu(?) and Cr(?) all were exothermic reaction.