Preliminary research on Cr(VI) removal by bacterial cellulose

Abstract

The bacterial cellulose prepared by ourselves was used in the adsorption of Cr(VI). The effects of performance parameters such as adsorption time, pH, the adsorbent dosage on Cr(VI) were investigated. Results showed that pH was a very important parameter to the adsorbed efficiency. Removal rate of Cr(VI) approached to 15% under the condition of pH 1.5, adsorbent dosage 1.0 g·L⁻¹ and co(initial concentration of Cr)50 mg·L⁻¹. The saturated monolayer adsorption quantity was 5.13 mg/g dry BC. The adsorption rate could be well fitted by pseudo-second rate model, adsorption isotherm could be described by Langmuir model, and they have good linear. Typical single-molecule layer adsorption of bacterial cellulose for Cr(VI) could be descripted and electrostatic force was one of the main sorption mechanisms. HCl can desorb the Cr(VI) from the adsorbent effectively.

Keywords

bacterial cellulose / Cr(VI) / removal

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