A new adsorbent, ammonium sulfamate-bacterial cellulose （ASBC）, was prepared through chemical modifications of bacterial cellulose. The process of adsorbing Cr（VI） including its isotherm and kinetics, was measured...A new adsorbent, ammonium sulfamate-bacterial cellulose （ASBC）, was prepared through chemical modifications of bacterial cellulose. The process of adsorbing Cr（VI） including its isotherm and kinetics, was measured and studied. The results showed that pH value was a very important parameter to the adsorbing efficiency. The adsorption kinetics can be described by a pseudo-second rate model and a particle diffusion equation. Both physical and chemical adsorptions existed in the adsorption process, but chemical adsorption was more dominatant. And particles internal diffusion was not the only rate controlling step. The adsorption equilibrium can be described by the Langmuir type, which indicated that a typical single-molecule layer adsorption of Cr（VI） by ASBC could be described. And the rate of adsorption followed the Slips model well, which indicated that ASBC had some multiphase and asymmetry. The coordination adsorption and ion exchange effect were the main mechanisms of chemical adsorption. The absorbed Cr（V1） can be desorbed effectively by 0.5 mol/L EDTA or HCI from the adsorbent, which could make it be reusable展开更多
基金supported by the Natural Science Foundation of Jilin Province(No.20101553)"Eleventh Five-Year"Science and Technology Research Projects of the Education Department of Jilin Province(No.2010-71)+1 种基金Doctor Science Research Starting Projects of Northeast Dianli University(No.BSJXM-2012)Science and Technology Research Projects of Jilin City(No.201162504)
文摘A new adsorbent, ammonium sulfamate-bacterial cellulose （ASBC）, was prepared through chemical modifications of bacterial cellulose. The process of adsorbing Cr（VI） including its isotherm and kinetics, was measured and studied. The results showed that pH value was a very important parameter to the adsorbing efficiency. The adsorption kinetics can be described by a pseudo-second rate model and a particle diffusion equation. Both physical and chemical adsorptions existed in the adsorption process, but chemical adsorption was more dominatant. And particles internal diffusion was not the only rate controlling step. The adsorption equilibrium can be described by the Langmuir type, which indicated that a typical single-molecule layer adsorption of Cr（VI） by ASBC could be described. And the rate of adsorption followed the Slips model well, which indicated that ASBC had some multiphase and asymmetry. The coordination adsorption and ion exchange effect were the main mechanisms of chemical adsorption. The absorbed Cr（V1） can be desorbed effectively by 0.5 mol/L EDTA or HCI from the adsorbent, which could make it be reusable
