Desulfurization performance of activated carbon fiber after oxidation modification

doi:10.16085/j.issn.1000-6613.2019-0305

Abstract

Abstract:

In order to apply activated carbon fiber (ACF) to air conditioning field to optimize the filtration of fresh air and improve the adsorption efficiency of ACF on polar molecule SO₂, ACF was modified by liquid phase oxidation to make polar fold-type complex filter，which were characterized by SEM、BET and FTIR. A direct air system test bench was established. The formaldehyde absorption-pararosaniline spectrophotometric method was used to detect the concentration of SO₂before and after outdoor air enters the fold-type complex filter. The dynamic desulfurization efficiency of unmodified ACF and modified ACF with different initial SO₂ concentrations was studied quantitatively. The results showed that (1) after HNO₃ oxidation modification, the surface microstructure of ACF was significantly changed. The specific surface area, pore volume and pore diameter respectively decreased from 653.70m²/g, 0.43cm³/g and 2.64nm to 488.84m²/g, 0.32cm³/g and 2.58nm. The transmittance of O—H and C—O decreased from 96% and 95% to 65.5% and 75% respectively, namely the content of surface acidic oxygen-containing functional groups (hydroxyl, carboxyl and ether group) increased. (2) The average dynamic desulfurization efficiency of unmodified ACF and modified ACF at low SO₂concentration was 33% and 75%, respectively, i.e., due to the enhancement of ACF surface polarity, the dynamic desulfurization efficiency was increased by 42%, which can be used in air conditioning filter to improve indoor air quality effectively.

Key words: activated carbon fiber, liquid phase oxidation, direct air system, adsorption, sulfur dioxide

摘要：

为了将活性炭纤维（ACF）应用于空调领域实现新风的过滤优化以及提高吸附极性分子SO₂的效率，对ACF进行液相氧化改性制成了具有极性的折叠式复合体滤网，并进行了SEM、BET和FTIR分析；搭建了直流式系统实验台，选用甲醛吸收-副玫瑰苯胺分光光度法检测室外空气进入滤网前后SO₂的浓度，定量研究了在不同初始SO₂浓度下改性前后滤网的动态脱硫效率。结果表明：① ACF经HNO₃氧化改性处理后，表面微观结构有显著变化，比表面积、孔容、孔径分别由653.70m²/g、0.43cm³/g、2.64nm降低至488.84m²/g、0.32cm³/g、2.58nm，O—H和C—O的透射率分别由96%、95%降低至65.5%、75%，即表面酸性含氧官能团（羟基、羧基和醚基）含量增加；② 改性前后ACF对低浓度SO₂的平均动态脱硫效率分别为33%和75%，即改性后ACF的表面极性增强，滤网的动态脱硫效率提高了42%，应用于空调过滤网可有效改善室内空气品质。

关键词: 活性碳纤维, 液相氧化, 直流式系统, 吸附, 二氧化硫

CLC Number:

TU834.8

Xinghui ZHANG,Jiaojiao YANG,Yaru DU. Desulfurization performance of activated carbon fiber after oxidation modification[J]. Chemical Industry and Engineering Progress, 2019, 38(11): 5151-5157.

张兴惠,杨姣姣,都亚茹. 活性炭纤维氧化改性后的脱硫性能[J]. 化工进展, 2019, 38(11): 5151-5157.

Figures/Tables 9

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序号	波数/cm^-1	引起吸收的主要基团	官能团	ACF透射率/%	mACF透射率/%
1	3418	O—H伸缩振动	酚羟基，羧基	96	65.5
2	1632	CC伸缩振动	烯烃，苯环	99	88
3	1000～1250	CH₂—O—CH₂中的C—O伸缩振动	醚基	95	75
4	867	C—H面外弯曲振动	烯烃	100	95
5	500～650	C—C伸缩振动	芳香氢	95	84

序号	波数/cm^-1	引起吸收的主要基团	官能团	ACF透射率/%	mACF透射率/%
1	3418	O—H伸缩振动	酚羟基，羧基	96	65.5
2	1632	CC伸缩振动	烯烃，苯环	99	88
3	1000～1250	CH₂—O—CH₂中的C—O伸缩振动	醚基	95	75
4	867	C—H面外弯曲振动	烯烃	100	95
5	500～650	C—C伸缩振动	芳香氢	95	84

序号	采样点	空气平均温度/℃	A	A ₀	实测ρ(SO₂)/μg·m^-3	温度校正ρ(SO₂)/μg·m^-3	η/%
1	q	7.5	0.0563	0.0282	118.38	131.53	35.58
	h	15.7	0.0459	0.0282	80.50	84.73
2	q	6.2	0.0432	0.0247	82.20	91.33	32.72
	h	12.8	0.0366	0.0247	58.38	61.45
3	q	7.5	0.0583	0.0250	138.66	154.06	30.08
	h	14.3	0.0483	0.0250	102.33	107.71
4	q	6.8	0.0317	0.0224	56.07	62.30	30.57
	h	14.5	0.0271	0.0224	35.77	37.65
5	q	7.8	0.0514	0.0261	107.16	119.07	35.12
	h	16.5	0.0421	0.0261	73.39	77.25
6	q	8.2	0.0354	0.0256	48.33	53.70	32.85
	h	17.9	0.0315	0.0256	34.26	36.06
7	q	7.4	0.0576	0.0275	125.50	139.44	33.69
	h	16.7	0.0472	0.0275	87.85	92.47

序号	采样点	空气平均温度/℃	A	A ₀	实测ρ(SO₂)/μg·m^-3	温度校正ρ(SO₂)/μg·m^-3	η/%
1	q	7.5	0.0563	0.0282	118.38	131.53	35.58
	h	15.7	0.0459	0.0282	80.50	84.73
2	q	6.2	0.0432	0.0247	82.20	91.33	32.72
	h	12.8	0.0366	0.0247	58.38	61.45
3	q	7.5	0.0583	0.0250	138.66	154.06	30.08
	h	14.3	0.0483	0.0250	102.33	107.71
4	q	6.8	0.0317	0.0224	56.07	62.30	30.57
	h	14.5	0.0271	0.0224	35.77	37.65
5	q	7.8	0.0514	0.0261	107.16	119.07	35.12
	h	16.5	0.0421	0.0261	73.39	77.25
6	q	8.2	0.0354	0.0256	48.33	53.70	32.85
	h	17.9	0.0315	0.0256	34.26	36.06
7	q	7.4	0.0576	0.0275	125.50	139.44	33.69
	h	16.7	0.0472	0.0275	87.85	92.47

序号	采样点	空气平均温度/℃	A	A ₀	实测ρ(SO₂)/μg·m^-3	温度校正ρ(SO₂)/μg·m^-3	η/%
1	q	6.3	0.0484	0.0280	88.47	98.30	70.11
1	h	12.7	0.0323	0.0280	27.91	29.38
2	q	6.7	0.0344	0.0241	50.23	55.82	75.77
2	h	13.1	0.0245	0.0241	12.85	13.52
3	q	6.5	0.0526	0.0290	100.78	111.97	78.11
3	h	12.3	0.0321	0.0290	23.29	24.52
4	q	7.3	0.0553	0.0254	125.24	139.16	70.96
4	h	13.5	0.0324	0.0254	38.40	40.42
5	q	8.5	0.0602	0.0280	134.89	149.88	73.71
5	h	17.5	0.0346	0.0280	37.43	39.40
6	q	7.8	0.0403	0.0247	70.93	78.82	71.52
6	h	14.6	0.0273	0.0247	21.33	22.45
7	q	8.4	0.0327	0.0224	60.67	67.41	80.57
7	h	12.7	0.0221	0.0224	12.44	13.10