Preparation of activated carbons
The coconut-shells used as carbon precursors, were cut
into 3 cm×3 cm×3 cm small blocks, washed with deionized
water for several times, and then put into an oven at 105 ◦C
for 24 h before carbonization. The dry coconut-shells were
transferred into a carbide furnace and carbonized at 600 ◦C
for 3 h under a nitrogen atmosphere with the heating rate of
10 ◦C/min. The carbonizations were fabricated by the following
three ways: (i) The carbonizationwas put into the horizontal
reactor and purged by nitrogen for 30 min, then calcinated
at 800 ◦C for 2 h with the heating ramp of 10 ◦C/min, and after
that the samples were cooled to room temperature, resulting
in the obtainment of the activated carbon (signed as W-AC).
(ii) The carbonization was impregnated into a phosphoric acid
solution with the quantity ratio of 1/2, and then transferred to
a carbide furnace to be carbonized at 600 ◦C for 2 h with the
heating ramp of 10 ◦C/min. After cooled to room temperature,
the activated carbons were washed with the alkali solution to
neutrality, and then dried in a furnace at 105 ◦C for 24 h, yielding
the modified activated carbon (signed as P-AC). (iii) The
carbonization was put into KOH solution with the quantity ratio
of 1/4, and then dried in an oven at 105 ◦C for 24 h. The
samples were calcinated in a furnace at 800 ◦C for 2 h with
the heating ramp of 10 ◦C/min, and then cooled to room temperature
and washed by dilute hydrochloric acid to neutrality.
In the end, the sample was dried in an oven at 105 ◦C for 24 h,
obtaining the modified activated carbon (signed as K-AC).
Preparation of activated carbons
The coconut-shells used as carbon precursors, were cut
into 3 cm×3 cm×3 cm small blocks, washed with deionized
water for several times, and then put into an oven at 105 ◦C
for 24 h before carbonization. The dry coconut-shells were
transferred into a carbide furnace and carbonized at 600 ◦C
for 3 h under a nitrogen atmosphere with the heating rate of
10 ◦C/min. The carbonizations were fabricated by the following
three ways: (i) The carbonizationwas put into the horizontal
reactor and purged by nitrogen for 30 min, then calcinated
at 800 ◦C for 2 h with the heating ramp of 10 ◦C/min, and after
that the samples were cooled to room temperature, resulting
in the obtainment of the activated carbon (signed as W-AC).
(ii) The carbonization was impregnated into a phosphoric acid
solution with the quantity ratio of 1/2, and then transferred to
a carbide furnace to be carbonized at 600 ◦C for 2 h with the
heating ramp of 10 ◦C/min. After cooled to room temperature,
the activated carbons were washed with the alkali solution to
neutrality, and then dried in a furnace at 105 ◦C for 24 h, yielding
the modified activated carbon (signed as P-AC). (iii) The
carbonization was put into KOH solution with the quantity ratio
of 1/4, and then dried in an oven at 105 ◦C for 24 h. The
samples were calcinated in a furnace at 800 ◦C for 2 h with
the heating ramp of 10 ◦C/min, and then cooled to room temperature
and washed by dilute hydrochloric acid to neutrality.
In the end, the sample was dried in an oven at 105 ◦C for 24 h,
obtaining the modified activated carbon (signed as K-AC).
การแปล กรุณารอสักครู่..