4. Conclusions
In summary, we have demonstrated the use of poly(PPA)-Cys nanofibers in the rapid and efficient removal of Cr(III) from real tannery waste water samples. Different parameters such as pH, load of nanofibers and time of exposure were optimized to achieve maximum removal. The optimum parameters were found to be 0.1 mg of nanofibers per mL of tannerywastewater with a pH of 5.5 and an exposure time of 45 min. Almost 99% Cr(III) was removed at these ideal conditions thus demonstrating the efficacy of our material. The maximum removal capacity at these ideal conditionswas
estimated to be approximately 1.75 g of Cr(III)/gram of polymeric material. This is probably due to a variety of factors including the apparent high surface to volume ratio exhibited by these nanofibers and also due to the availability of numerous cysteine groups that are known to have high binding affinities with heavy metal ions. These preliminary results suggest a far greater removal capacity of Cr(III) than by other previously reported materials. However, the composition of different waters and industrial effluents can vary greatly, and other factors, such as, initial metal ion concentration,
must be considered for an objective comparison of metal ion removal capacity.
4. Conclusions
In summary, we have demonstrated the use of poly(PPA)-Cys nanofibers in the rapid and efficient removal of Cr(III) from real tannery waste water samples. Different parameters such as pH, load of nanofibers and time of exposure were optimized to achieve maximum removal. The optimum parameters were found to be 0.1 mg of nanofibers per mL of tannerywastewater with a pH of 5.5 and an exposure time of 45 min. Almost 99% Cr(III) was removed at these ideal conditions thus demonstrating the efficacy of our material. The maximum removal capacity at these ideal conditionswas
estimated to be approximately 1.75 g of Cr(III)/gram of polymeric material. This is probably due to a variety of factors including the apparent high surface to volume ratio exhibited by these nanofibers and also due to the availability of numerous cysteine groups that are known to have high binding affinities with heavy metal ions. These preliminary results suggest a far greater removal capacity of Cr(III) than by other previously reported materials. However, the composition of different waters and industrial effluents can vary greatly, and other factors, such as, initial metal ion concentration,
must be considered for an objective comparison of metal ion removal capacity.
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