KOH活化法制备气化稻壳活性炭及其吸附性能

doi:10.3969/j.issn.1673-5854.2021.01.005

Abstract

Abstract:

Potassium hydroxide (KOH) was used as activating agent to prepare activated carbon with gasified rice husk char (GRHC) as raw material. The effects of activation temperature and mass ratio of KOH to char on the specific surface area, pore diameter distribution and iodine value of activated carbon were investigated. The physicochemical properties of activated carbon were characterized by automatic gas adsorption analyzer, X-ray diffraction, Fourier transform infrared spectrometer, and scanning electron microscope, et al. The adsorption mechanism of methyl orange was studied by adsorption isotherm and adsorption kinetics. The results showed that when the activation time was 1 h, the yield of activated carbon decreased gradually with the increase of activation temperature and alkali-carbon ratio, and the specific surface area and iodine adsorption value increased first and then decreased. The optimal conditions for preparation of activated carbon were mass ratio of KOH to char 2:1 and activation temperature of 800℃. Under these conditions, the specific surface area, total pore volume, iodine value and saturated adsorption value of methyl orange reached their maximum values of 1 829.09 m²/g, 1.007 cm³/g, 1 984.85 mg/g and 217.87 mg/g, respectively and the yield of activated carbon was 41.73%. The adsorption process of methyl orange by activated carbon was highly correlated with Langmuir and Freundlich models (R²>0.99), and the adsorption kinetics was more consistent with the pseudo-second-order kinetic model.

Key words: gasified rice husk char, KOH method, specific surface area, activated carbon, methyl orange, adsorption

CLC Number:

TQ35
TQ424

Youlong WU, Jialong XU, Zhongqing MA, Wei CAI, Xiaohuan LIU, Jun QIAN. Preparation of Activated Carbon from Gasified Rice Husk Char Activated by KOH and Its Adsorption Properties[J]. Biomass Chemical Engineering, 2021, 55(1): 31-38.

Figures/Tables 7

Table 1

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Table 2

Fig.2

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References 27

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样品sample	工业分析proximate analysis/%			元素分析elemental analysis/%					低位热值/ (MJ·kg^-1) heat value
样品sample	灰分 ash	挥发分 volatile	固定碳 fixed carbon	C	H	O	N	S	低位热值/ (MJ·kg^-1) heat value
稻壳rice husk	31.87	60.03	8.10	37.41	5.73	55.72	0.95	0.19	10.87
气化稻壳炭GRHC	54.38	11.78	33.84	35.46	1.53	62.83	0.01	0.17	12.88

制备条件 preparation condition		得率/% yield	比表面积/ (m²·g^-1) specificsurfa cearea	总孔容积/ (cm³·g^-1) total pore volume	微孔容积/ (cm³·g^-1) micropore volume	中孔容积/ (cm³·g^-1) mesopore volume	微孔率/% micropore ratio	中孔率/% mesopore ratio	碘吸附值/ (mg·g^-1) iodine value
气化稻壳炭GRHC			154.07	0.155	0.013	0.068	8.40	43.96	96.37
碱炭比 mass ratio of KOH/char	1:1	45.16	1166.45	0.590	0.409	0.059	69.28	9.99	1277.05
	2:1	41.73	1829.09	1.007	0.574	0.228	57.00	22.64	1984.85
	3:1	38.64	1380.44	0.762	0.461	0.113	60.54	14.84	1504.85
活化温度 activation temperature	600 ℃	53.21	1058.88	0.479	0.243	0.126	50.73	26.30	923.50
	700 ℃	47.36	1365.75	0.650	0.357	0.153	54.92	23.54	1187.58
	800 ℃	41.73	1829.09	1.007	0.574	0.228	57.00	22.64	1984.85
	900 ℃	33.51	1528.90	0.810	0.434	0.160	53.59	19.76	1449.50

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Preparation of Activated Carbon from Gasified Rice Husk Char Activated by KOH and Its Adsorption Properties

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