Preparation and characterization of microporous NaOH activated carbons from hydrofluoric acid leached rice husk and its application for lead(II) adsorption
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon Letters / 15권 / 1호
ㆍ저자명 : A. F. Hassan, A. M. Youssef
ㆍ저자명 : A. F. Hassan, A. M. Youssef
목차
1. Introduction2. Materials and Methods
3. Results and Discussion
4. Conclusions
Acknowledgments
References
한국어 초록
Three activated carbons (ACs) were prepared using NaOH (N) as an activating agent. Hydrofluoricacid pre-leached rice husk was used as a precursor. After leaching, the precursorwas washed with distilled water, dried, crushed, and then sieved; a size fraction of 0.3-0.5mm was selected for carbonization in the absence of air at 600°C. The carbonization product(LC) was mixed with NaOH at ratios of 1:2, 1:3, and 1:4 (wt of LC: wt of NaOH) andthe produced ACs after activation at 800°C were designated NLC21, NLC31, and NLC41,respectively. Surface and textural properties were determined using nitrogen adsorption at-196°C, scanning electron microscopy images, thermogravimetric analysis, and Fouriertransform infrared spectra . These ACs were used as adsorbents for lead(II) from aqueoussolutions. The effects of the textural properties and the chemistry of the carbon surfaceswere investigated and the impact of the operation conditions on the capacity for lead(II)sorption was also considered. Modification of NLC41 with H2O2 and HNO3 gave two otheradsorbents, HNLC41 and NNLC41 respectively. These two new samples exhibited the highestremoval capacities for lead(II), i.e.117.5 and 128.2 mg/g, respectively. The adsorption datafitted the Langmuir isotherm and the kinetic adsorption followed pseudo-second order kinetics.The thermodynamic parameters have been determined and they indicated a spontaneousendothermic process.영어 초록
Three activated carbons (ACs) were prepared using NaOH (N) as an activating agent. Hydrofluoricacid pre-leached rice husk was used as a precursor. After leaching, the precursor
was washed with distilled water, dried, crushed, and then sieved; a size fraction of 0.3-0.5
mm was selected for carbonization in the absence of air at 600°C. The carbonization product
(LC) was mixed with NaOH at ratios of 1:2, 1:3, and 1:4 (wt of LC: wt of NaOH) and
the produced ACs after activation at 800°C were designated NLC21, NLC31, and NLC41,
respectively. Surface and textural properties were determined using nitrogen adsorption at
-196°C, scanning electron microscopy images, thermogravimetric analysis, and Fourier
transform infrared spectra . These ACs were used as adsorbents for lead(II) from aqueous
solutions. The effects of the textural properties and the chemistry of the carbon surfaces
were investigated and the impact of the operation conditions on the capacity for lead(II)
sorption was also considered. Modification of NLC41 with H2O2 and HNO3 gave two other
adsorbents, HNLC41 and NNLC41 respectively. These two new samples exhibited the highest
removal capacities for lead(II), i.e.117.5 and 128.2 mg/g, respectively. The adsorption data
fitted the Langmuir isotherm and the kinetic adsorption followed pseudo-second order kinetics.
The thermodynamic parameters have been determined and they indicated a spontaneous
endothermic process.
참고 자료
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