脱气预处理条件对木质活性炭比表面积和孔容积分析结果影响初探

doi:10.3969/j.issn.1673-5854.2022.05.004

Abstract

Abstract:

Before determining the specific surface area and pore volume of woody activated carbon, the activated carbon was pre-treated with degassing, and the effect of pre-treatment conditions(desorption temperature and desorption time) on the specific surface area and pore volume of activated carbon was investigated. The obtained results were compared with those measured under the recommended conditions of the instrument. The results showed that the desorption temperature and time had little influence on the specific surface area and pore volume of physical activated carbon. It was owing to the preparation temperature of physical activated carbon was high few functional groups, the structure was mainly microporous, the adsorption type was mainly physical adsorption, and the adsorption and desorption speeds were fast. The optimum pretreatment condition of physical activated carbon was desorbed at a temperature of 150 ℃ for 3 hours. Compared with the pretreatment conditions of 350 ℃ and 24 hours recommended in the instruction manual of ASAP 2460, pretreatment time was significantly shortened, the power consumption was reduced, and the detection efficiency was improved. The degassing temperature and time had a great influence on the specific surface area and micro-pore of chemical wood activated carbon, and the suitable pretreatment condition was 300 ℃ for 12 h. The main reason was that the preparation temperature of activated carbon by phosphoric acid method was relatively low, and there were many heteroatoms and the surface chemical groups. Physical and chemical adsorption were easy to occur simultaneously, which required higher temperature and longer time for degassing. When the degassing temperature was too high, the adsorbate in the pores would be carbonized to form carbonaceous particles that blocked the pores. At the same time, part of the physical adsorption would be converted into chemical adsorption at a higher activation energy, which would reduce the analysis results.

Key words: activated carbon, specific surface area, pore volume

CLC Number:

TQ35
TQ424

Mingzhe MA, Kang SUN, Hao SUN, Yanping ZHANG, Guanfeng LIN, An'guo WEI. A Preliminary Study of the Degassing Pretreatment Effect on the Specific Surface Area and Pore Volume of Woody Activated Carbon[J]. Biomass Chemical Engineering, 2022, 56(5): 23-29.

Figures/Tables 9

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References 19

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样品 sample	元素分析/% elemental analysis			工业分析/% industrial analysis		表面官能团/(mmol·g^-1) surface functional groups
样品 sample	C	O	H	挥发分 volatile content	灰分 ash content	酚羟基 phenolic hydroxyl	羧基 carboxyl	内酯基 lactone group
物理法活性炭 physical activated carbon	84.52	4.10	0.54	4.48	3.41	0.106	0.151	0.118
化学法活性炭 chemical activated carbon	74.58	8.64	0.79	14.93	6.24	0.957	0.849	0.541

脱气温度/℃ degassing temperature	总孔容积/(cm³·g^-1) total pore volume	微孔容积/(cm³·g^-1) micropore volume	介孔容积/(cm³·g^-1) mesoporous volume	比表面积/(m²·g^-1) specific surface area
100	0.538 1	0.471 6	0.053 1	1 412
150	0.556 2	0.491 4	0.061 0	1 501
200	0.557 8	0.498 0	0.061 7	1 514
250	0.562 2	0.499 2	0.062 2	1 516
300	0.566 9	0.502 2	0.062 3	1 525
350	0.571 7	0.506 7	0.062 7	1 556

脱气时间/h degassing time	总孔容积/(cm³·g^-1) total pore volume	微孔容积/(cm³·g^-1) micropore volume	介孔容积/(cm³·g^-1) mesoporous volume	比表面积/(m²·g^-1) specific surface area
1	0.532 5	0.452 9	0.058 1	1 387
3	0.556 2	0.491 4	0.061 0	1 496
6	0.558 1	0.492 6	0.061 9	1 503
12	0.559 7	0.494 5	0.062 8	1 514
24	0.564 2	0.498 6	0.064 7	1 521

脱气温度/℃ degassing temperature	总孔容积/(cm³·g^-1) total pore volume	微孔容积/(cm³·g^-1) micropore volume	介孔容积/(cm³·g^-1) mesoporous volume	比表面积/(m²·g^-1) specific surface area
100	1.201 3	0.412 5	0.743 3	1 631
150	1.229 0	0.440 1	0.767 8	1 693
200	1.239 4	0.463 1	0.768 9	1 743
250	1.309 6	0.501 3	0.792 6	1 909
300	1.313 8	0.501 7	0.793 1	1 910
350	1.285 2	0.491 5	0.774 7	1 853

脱气时间/h degassing time	总孔容积/(cm³·g^-1) total pore volume	微孔容积/(cm³·g^-1) micropore volume	介孔容积/(m³·g^-1) mesoporous volume	比表面积/(m²·g^-1) specific surface area
1	1.248 2	0.455 6	0.741 1	1 637
3	1.257 4	0.466 6	0.759 9	1 672
6	1.253 9	0.467 3	0.753 2	1 836
12	1.309 6	0.501 2	0.798 8	1 909
24	1.309 7	0.501 1	0.790 0	1 911

A Preliminary Study of the Degassing Pretreatment Effect on the Specific Surface Area and Pore Volume of Woody Activated Carbon

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