کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5745768 | 1618781 | 2018 | 6 صفحه PDF | دانلود رایگان |
- The PAC countercurrent two-stage adsorption process was performed.
- The Cr(VI) removal efficiency was improved by > 50% by the process.
- A calculation method correlating the effluent Cr(VI) concentration and PAC dose was feasible.
To exploit the adsorption capacity of commercial powdered activated carbon (PAC) and to improve the efficiency of Cr(VI) removal from aqueous solutions, the adsorption of Cr(VI) by commercial PAC and the countercurrent two-stage adsorption (CTA) process was investigated. Different adsorption kinetics models and isotherms were compared, and the pseudo-second-order model and the Langmuir and Freundlich models fit the experimental data well. The Cr(VI) removal efficiency was >80% and was improved by 37% through the CTA process compared with the conventional single-stage adsorption process when the initial Cr(VI) concentration was 50Â mg/L with a PAC dose of 1.250Â g/L and a pH of 3. A calculation method for calculating the effluent Cr(VI) concentration and the PAC dose was developed for the CTA process, and the validity of the method was confirmed by a deviation of <5%.
Journal: Chemosphere - Volume 190, January 2018, Pages 97-102