The isothermal adsorption of dyes on a variety of sisal based activated carbon fibers (SACFs),and the influence of pH and temperature on adsorption are discussed in this paper.The results indicate that the adsorption...The isothermal adsorption of dyes on a variety of sisal based activated carbon fibers (SACFs),and the influence of pH and temperature on adsorption are discussed in this paper.The results indicate that the adsorption of methylene blue,crystal violet and Eriochrome blue black R on SACFs shows type I isotherms and can be described by the Langmuir equation or the Freudlich equation.The acidity of solution has greatly influence over the adsorption amounts of methylene blue,crystal violet and Eriochrome blue black R.As pHs of the solutions were adjusted to increase or decrease from the original acidity of the solution(4.7,4.1 and 4.0 for methylene blue,crystal violet and Eriochrome blue black R,respectively),the amounts of dyes adsorbed on SACFs increased.The adsorption temperature(in the range of 25-50℃) exerts little influence on the adsorption amount of methylene blue,crystal violet and fluorescein.For azo dyes (Eriochrome blue black R and Eriochrome black T),however,the adsorption amount increases slightly with the elevation of temperature.展开更多
The adsorption behavior of dyes on a variety of sisal based activated carbon fibers (SACF) has been studied in this paper. The results show that this kind of ACF has excellent adsorption capacities for some organic (d...The adsorption behavior of dyes on a variety of sisal based activated carbon fibers (SACF) has been studied in this paper. The results show that this kind of ACF has excellent adsorption capacities for some organic (dye) molecules.SACF can remove nearly all methylene blue,crystal violet,bromophenol blue and Eriochrome blue black R from water after static adsorption for 24h. at 30℃. The adsorption amounts can reach more than 400mg/g when adding 50 mg SACF into 50 ml dye solution.Under the same conditions,the adsorption amounts of xylenol orange fluorescein and Eriochrome black T wree lower.On the other hand,the adsorption amounts change along with the characteristics of adsorbents.The SACFs activated above 840℃,which have higher specific surface areas and wider pore radii,have higher adsorption amounts for the dyes.The researching results also show that the adsorption rates of dyes onto SACFs decrease by the order of methylene blue,Eriochrome blue black R and crystal violet.展开更多
文摘The isothermal adsorption of dyes on a variety of sisal based activated carbon fibers (SACFs),and the influence of pH and temperature on adsorption are discussed in this paper.The results indicate that the adsorption of methylene blue,crystal violet and Eriochrome blue black R on SACFs shows type I isotherms and can be described by the Langmuir equation or the Freudlich equation.The acidity of solution has greatly influence over the adsorption amounts of methylene blue,crystal violet and Eriochrome blue black R.As pHs of the solutions were adjusted to increase or decrease from the original acidity of the solution(4.7,4.1 and 4.0 for methylene blue,crystal violet and Eriochrome blue black R,respectively),the amounts of dyes adsorbed on SACFs increased.The adsorption temperature(in the range of 25-50℃) exerts little influence on the adsorption amount of methylene blue,crystal violet and fluorescein.For azo dyes (Eriochrome blue black R and Eriochrome black T),however,the adsorption amount increases slightly with the elevation of temperature.
文摘The adsorption behavior of dyes on a variety of sisal based activated carbon fibers (SACF) has been studied in this paper. The results show that this kind of ACF has excellent adsorption capacities for some organic (dye) molecules.SACF can remove nearly all methylene blue,crystal violet,bromophenol blue and Eriochrome blue black R from water after static adsorption for 24h. at 30℃. The adsorption amounts can reach more than 400mg/g when adding 50 mg SACF into 50 ml dye solution.Under the same conditions,the adsorption amounts of xylenol orange fluorescein and Eriochrome black T wree lower.On the other hand,the adsorption amounts change along with the characteristics of adsorbents.The SACFs activated above 840℃,which have higher specific surface areas and wider pore radii,have higher adsorption amounts for the dyes.The researching results also show that the adsorption rates of dyes onto SACFs decrease by the order of methylene blue,Eriochrome blue black R and crystal violet.
