烘焙预处理对玉米秸秆磷酸法活性炭制备及性能影响

doi:10.3969/j.issn.1673-5854.2022.04.001

Abstract

Abstract:

The effects of torrefaction pretreatment on the preparation and properties of activated carbon by phosphoric acid using corn straw as the raw materials were studied. The results showed that the contents of carbon and fixed carbon were increased and the volatile content was reduced using torrefaction pretreatment which increased the quality of pyrolytic carbon. The effect of torrefaction temperature was stronger than that of torrefaction time. By torrefaction pretreatment, the specific surface area of activated carbon increased firstly and then decreased, the total pore volume and the mesoporosity decreased, while the microporosity increased significantly. The adsorption performance of activated carbon could be improved by torrefaction pretreatment. As 100 g corn straw with the particle size of 154-450 μm were pretreated under the torrefaction temperature of 240 ℃ and torrefaction time of 60 min, the pretreated corn straw contained carbon, fixed carbon, and ash with the mass fractions of 51.32%, 27.64% and 4.72%, respectively. The activated carbon was prepared from the pretreated corn straw under the impregnation ratio of 1∶4(i.e., the mass ratio of the pretreated corn straw and 55% phosphate acid), dipping temperature of 140 ℃, dipping time of 90 min, activated temperature of 400 ℃, activated time of 60 min, the specific surface area of the obtained activated carbon reached 1 317.05 m²/g, and the values of iodine adsorption, methylene blue adsorption, and caramel decolorization were 876 mg/g, 210 mg/g and 100%, respectively.

Key words: corn straw, torrefaction, phosphoric acid activation, activated carbon, properties

CLC Number:

TQ35
TQ42

Ruting XU, Xincheng LU, Kang SUN, Chang TAN, Yanping ZHANG. Effects of Torrefaction Pretreatment on the Preparation and Properties of Activated Carbon from Corn Straw by Phosphoric Acid Activation[J]. Biomass Chemical Engineering, 2022, 56(4): 1-8.

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References 20

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样品¹⁾ sample	温度/℃ temperature	元素分析/% elemental analysis				工业分析/% industrial analysis			组分分析/% proximate analysis			得率/% yield
样品¹⁾ sample	温度/℃ temperature	C	O	H	N	挥发分 volatile	固定碳 fixed carbon	灰分 ash	半纤维素 hemi-cellulose	纤维素 cellulose	木质素 lignin	得率/% yield
CS	—	43.15	50.31	5.90	0.64	78.84	18.21	3.31	15.48	36.41	10.55	100
CS-210-60	210	48.55	45.30	5.38	0.77	72.12	23.65	4.23	5.34	41.39	27.91	80.03
CS-240-60	240	51.32	42.59	5.04	1.05	67.64	27.64	4.72	0.52	45.74	42.05	71.90
CS-270-60	270	55.22	38.83	4.76	1.19	59.58	35.59	4.83	0.26	47.68	54.61	60.20

样品 sample	时间/min time	元素分析/% elemental analysis				工业分析/% industrial analysis			组分分析/% proximate analysis			得率/% yield
样品 sample	时间/min time	C	O	H	N	挥发分 volatile	固定碳 fixed carbon	灰分 ash	半纤维素 hemi-cellulose	纤维素 cellulose	木质素 lignin	得率/% yield
CS-240-30	30	50.54	43.35	5.17	0.94	68.94	26.78	4.28	0.69	44.79	36.18	75.85
CS-240-60	60	51.32	42.59	5.04	1.05	67.64	27.64	4.72	0.52	45.71	42.05	71.90
CS-240-120	120	52.37	41.53	5.14	0.96	64.49	30.75	4.76	0.51	46.81	43.29	70.13

样品 sample	质量损失/% mass loss	残留质量/% residue	DTG_max/(%·min^-1)	T_max/℃	T_i/℃	T_f/℃
CS	77.00	23.00	-7.61	324.9	183.3	398.73
CS-210-60	70.13	29.87	-10.48	327.8	295.0	411.23
CS-240-60	63.43	36.57	-8.93	327.9	302.3	418.72
CS-270-60	54.47	45.53	-5.88	329.0	303.2	423.73

样品 sample	质量损失/% mass loss	残留质量/% residue	DTG_max/(%·min^-1)	T_max/℃	T_i/℃	T_f/℃
CS	77.00	23.00	-7.61	324.9	183.3	398.73
CS-240-30	70.00	30.00	-10.07	325.8	300.5	417.23
CS-240-60	63.43	36.57	-8.93	327.8	301.3	418.72
CS-240-120	61.69	38.31	-8.50	328.8	302.3	418.73

原料 material	活性炭得率/% yield	灰分/% ash	表观密度/(g·mL^-1) apparent density
CS	27.87	1.73	0.229
CS-210-60	34.74	2.09	0.171
CS-240-60	34.73	2.14	0.152
CS-270-60	34.15	2.54	0.134
CS-240-30	35.06	1.99	0.134
CS-240-60	34.73	2.14	0.152
CS-240-120	36.45	2.19	0.158

Effects of Torrefaction Pretreatment on the Preparation and Properties of Activated Carbon from Corn Straw by Phosphoric Acid Activation

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原料 material	比表面积/(m²·g^-1) specific surface area	总孔容/(cm³·g^-1) total pore volume	平均孔径/nm average pore diameter	微孔率/% microporosity	中孔率/% mesoporosity	碘吸附值/(mg·g^-1) iodine adsorption value	亚甲基蓝吸附值/(mg·g^-1) methylene blue adsorption value	焦糖脱色率/% decolorization rate of caramel
CS	1225.80	1.151	3.63	24.03	65.04	843	195	100
CS-210-60	1219.59	0.919	2.93	33.08	56.77	858	202.5	105
CS-240-60	1317.05	0.982	2.88	32.41	56.73	876	210	100
CS-270-60	1113.89	0.671	2.37	46.68	40.41	840	180	60
CS-240-30	1155.01	0.822	2.81	36.50	52.21	865	210	100
CS-240-120	979.18	0.592	2.39	46.57	38.16	845	172.5	60

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