Removal of methylene blue using lemon grass ash as an adsorbent

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 15권 / 2호
ㆍ저자명 : Harminder Singh, Dawa Tshering B

목차

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
References

한국어 초록

Wastewater from textile industries is a major cause of water pollution in most developingcountries. In order to address the issues of water pollution and high cost for treatment processes,the use of an inexpensive and environmentally benign adsorbents has been studied.The objective was to find a better alternative to the conventional methods. Lemon grasswaste (ash) collected from a lemon grass stream distillation subunit in Bhutan was tested fordye removal from aqueous solutions. The study investigated the removal of methylene blueusing the following operational parameters: initial concentration (100-600 mg/L), contacttime, adsorbent dose (0.1- 0.55 gm/100 mL), and pH (3-10). It was found that the percentageremoval of dye increased with a decrease of the initial concentration and increased contacttime and dose of adsorbent. The basic pH solution of dye showed better adsorption capacityas compared to the acidic dye solution. Langmuir and Freundlich adsorption isothermswere fitted to the data well. Data fitted better to Lagergren pseudo 2nd order kinetics thana 1st order kinetic model. Surface morphology was also examined via scanning electronmicroscopy. An elemental analysis was also carried out and the chemical composition andfunctional groups were analyzed using energy dispersive X-ray spectroscopy and Fouriertransform infrared spectroscopy techniques, respectively. The obtained results indicate thatlemon grass ash could be employed as a low cost alternative to commercial activated carbonin wastewater treatment for the removal of dyes.

영어 초록

Wastewater from textile industries is a major cause of water pollution in most developing
countries. In order to address the issues of water pollution and high cost for treatment processes,
the use of an inexpensive and environmentally benign adsorbents has been studied.
The objective was to find a better alternative to the conventional methods. Lemon grass
waste (ash) collected from a lemon grass stream distillation subunit in Bhutan was tested for
dye removal from aqueous solutions. The study investigated the removal of methylene blue
using the following operational parameters: initial concentration (100-600 mg/L), contact
time, adsorbent dose (0.1- 0.55 gm/100 mL), and pH (3-10). It was found that the percentage
removal of dye increased with a decrease of the initial concentration and increased contact
time and dose of adsorbent. The basic pH solution of dye showed better adsorption capacity
as compared to the acidic dye solution. Langmuir and Freundlich adsorption isotherms
were fitted to the data well. Data fitted better to Lagergren pseudo 2nd order kinetics than
a 1st order kinetic model. Surface morphology was also examined via scanning electron
microscopy. An elemental analysis was also carried out and the chemical composition and
functional groups were analyzed using energy dispersive X-ray spectroscopy and Fourier
transform infrared spectroscopy techniques, respectively. The obtained results indicate that
lemon grass ash could be employed as a low cost alternative to commercial activated carbon
in wastewater treatment for the removal of dyes.

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