Research On Preparation And Batch And Column Adsorption Performance Of Carbon Materials Based On Sodium Alginate

Since reform and opening-up,the development of industry is rapid.Water pollution has also become more and more serious,especially heavy metal pollution and antibiotics pollution have a bad effect on people's Daily life,so the preparation of high-performance material for removal of heavy metals and antibiotics becomes very meaningful.In this work,a new carbon beads with developed nanonetwork were successfully fabricated through combinational carbothermal reduction and simple acid treatment of Ca2+ gelled sodium alginate hydrogel beads,and be used to research the removal of Cr(?)with batch and column adsorption experiments.Meanwhile,another carbon beads with abundant macropore structure were also successfully fabricated through combinational carbothermal reduction and simple acid treatment of freezing-dry contained CaCO3 calcium alginate hydrogel beads,and be used to research the adsorption performance of TC with batch and column adsorption experiments.In the section one,the monolithic adsorbents were fabricated,Alg-CB-X,which were utilized for the removal of Cr(?)from an aqueous system using a batch process,and the relevant parameters like pH,contact time,initial concentration,kinetics,isotherms and the effect of co-existing ions were investigated.The results showed that the removal capacity of Cr(?)increased with carbonated temperature increasing.In addition,a low pH value is beneficial for the removal of Cr(?);there are Cr(?)when pH is lower than 3,which demonstrated that carbon material could reduce a portion of Cr(?)under low pH.With the contact time and initial concentration increasing,the solution concentration of reduced Cr(?)increased gradually,which is due to the small amounts of oxygen containing functional groups on carbon material could reduce Cr(?)to Cr(?)slightly.Besides,the column experiment showed that the removal capacity of Cr(?)decreased with the flow rate of solution increasing.Finally,The mechanism investigation showed that the removal of Cr(?)involved electrostatic attraction and slightly involved redox reactions,negatively charged Cr(?)was absorbed by the protonated material surface,and reduced by oxygen containing functional groups on carbon material.Cr(?)was deposited onto the carbon surface,and the formed Cr(?)was released into the aqueous phase due to electronic repulsion between the positively-charged groups and the Cr(?).Therefore,the experiments data showed that the amounts of total Cr and Cr were unequal,and the different were the amounts of reduced Cr(?).Based on monolithic carbon materials,the CaCO3 as template was used to enlarge the inner-pore size of materials,and freeze drying,makes the material surface porosity have a lot of ascension.Meanwhile,the pore size distribution was measured by mercury injection apparatus,the results showed there were abundant macropores and mesoporous in the modified materials,but the unmodified materials mainly distributed micropores.The modified materials were used to absorb tetracycline(TC)in aqueous using a batch process,and compared with CC1.00-CB,the adsorption capacity of CC1.00-CB was increased from 152.69mg/g to 279.34mg/g.the column experiments showed that the adsorption capacity of TC decreased with the flow rate and concentration of solution increasing.