Structural Modification And Application Of Anionic Sugar Beet Pulp Biosorbent

Xinjiang is the largest beet sugar base in China.Sugar beet pulp(SBP)is the waste product produced during the beet sugar manufacturing.The total amount of SBP during the year of 2016/2017 is produced approximately 7 million and 200 thousand tons.In general,SBP is used as feed,but it will pollute the environment if it is not processed on time.Interestingly,SBP is rich in pectin,cellulose hemicellulose and lignin.It is also used as biosorbent to separate the toxic heavy metals from waste water,due to presence of carboxyl,hydroxyl and carbonyl functional groups.The existing problems are: there is only a little research on anion-type separation of organic matter pollution;the expansion of coefficient and physical stability of SBP is slightly high;the adsorption capacity needs to improve,etc.The aim of this research is to transform the SBP structure after bleaching with high valent cation zirconium(Zr(IV)),and design single factor experiment and orthogonal test to optimize the modification process of SBP.The present research also aims to get ZBSBP(Expand full name),discuss the factors like pH,adsorbing concentration,adsorbing capacity,operating temperature and time which affect separation of methyl blue,vital red and nuclear fast red from ZBSBP and analyze adsorption equilibrium,dynamics and thermodynamics.The study also provides data and practice reference to SBP's structural modification and segregation of anion colored dye.Therefore,the present study offers a new idea to the resource integrated utilization of SBP.The main research results and conclusions are as follows:1.After bleaching and zirconium modification of SBP,its adsorption capacity is higher than the natural SBP.Optimized SBP bleaching technological conditions are: sodium hypochlorite 0.7mL,glacial acetic acid 0.1mL,temperature is 90 Celsius degrees,time duration is 60 minutes.Through analyzing the test result of a scanning electron microscope and spectroscopy,it is found that the modification of the ZBSBP is successful which was shown by the combination of hydroxyl and Zr(IV),and hydrolyzing of Zr(IV)in ZBSBP.2.The best adsorption technological condition of ZBSBP towards nuclear fast red in simulated dye waste water are: pH 7.0,adsorption dosage 0.6g,dye concentration 100mg/L,adsorption time duration 60 mins and temperature 25 ?.Under the optimal conditions,the removal of nuclear fast red was 97.4±0.3%.The crystallization rate was similar between the dye-loaded ZBSBP and ZBSBP according to the XRD analysis results.However,the FTIR results testify that the nuclear red is adsorped on ZBSBP.The adsorption of Nuclear Red in ZBSBP fits in pseudo-second-order dynamic model,and the adsorption process is exothermic,which fits into Langmuir adsorption isotherm equilibrium model.3.ZBSBP has a good adsorptive effect on Reactive Red X-3B in simulated dye waste water,and the best adsorption condition are: pH3.0,adsorption dosage 0.25 g,dye concentration 100 mg/L,adsorption time duration 80 mins,temperature 45 ?.The crystallization rate was similar between the dye-loaded ZBSBP and ZBSBP according to the XRD analysis results.However,the FTIR results testify that the Reactive Red X-3B is adsorped on ZBSBP.The adsorption of Active red in ZBSBP fits in pseudo-second-order dynamic model,and the adsorption process is endothermic,which fits into Langmuir adsorption isotherm equilibrium model.