Citation: Min Lu, Xiao-Hui Guan, Xiao-Hui Xu, De-Zhou Wei. Characteristic and mechanism of Cr(Ⅵ) adsorption by ammonium sulfamate-bacterial cellulose in aqueous solutions[J]. Chinese Chemical Letters, ;2013, 24(3): 253-256. shu

Characteristic and mechanism of Cr(Ⅵ) adsorption by ammonium sulfamate-bacterial cellulose in aqueous solutions

1.
a School of Chemical Engineering, Northeast Dianli University, Jilin 132012, China;
2.
b School of Resources & Civil Engineering, Northeastern University, Shenyang 110004, China

Corresponding author: Min Lu,
Received Date: 8 November 2012
Available Online: 9 January 2013

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(Ⅵ) can be desorbed effectively by 0.5 mol/L EDTA or HCl from the adsorbent, which could make it be reusable.
- Ammonium sulfamate-bacterial cellulose,
- Adsorption characteristic,
- Adsorption mechanism,
- Cr(Ⅵ)
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1.
沈阳化工大学材料科学与工程学院沈阳 110142