龙凤檀磷酸法活性炭的孔径分布与吸附性能的构效关系

doi:10.3969/j.issn.0253-2417.2023.01.006

Abstract

Abstract:

The influences of phosphoric acid method activation temperature, phosphoric acid concentration and impregnation ratio on adsorption performance of cumaru activated carbon were investigated by using the processing the residue of hardwood cumaru as a raw material. Structural analysis of activated carbon was analyzed by N₂ adsorption-desorption isotherm, and the structure-activity relationship between the effective pore volume and the liquid phase adsorption results(iodine adsorption value, methylene blue adsorption value and caramel decolorization rate) were calculated according to the adsorption theory and DFT pore size distribution map. The results showed that the synthesized activated carbon exhibited excellent adsorption properties and pore structure under the conditions of 60% phosphoric acid solution, the impregnation ratio of phosphoric acid to cumaru 3∶1(mL∶g), the activation temperature of 500 ℃ and the activation time of 120 min. Its iodine value, methylene blue value, caramel decolorization, specific surface area, and total pore volume were 841 mg/g, 270 mg/g, 120%, 1 516 m²/g and 1.145 cm³/g, respectively. These properties were comprehensively superior to those of the activated carbon prepared from the residues of soft wood fir. The corresponding pore volume of different pore size distributions was calculated for cumaru activated carbon using the Density Functional Theory(DFT). After theoretical analysis and fitting calculation, it was found that there was a good linear relationship between iodine adsorption value and pore volume with pore diameter of 1.0-2.7 nm, between methylene blue adsorption value and pore volume with pore diameter of 1.7-5.0 nm, and between caramel decolorization rate and pore volume with pore diameter of 2.7-6.3 nm. These results indicated a good degree of association(R²>0.95) between the pore structure distribution of activated carbon and its liquid phase adsorbing performance.

Key words: cumaru, phosphoric acid activated carbon, pore size distribution, liquid phase adsorption, linear fitting

CLC Number:

TQ35
TQ424.1

Mingzhe MA, Hao SUN, Kang SUN, Mengmeng FAN, Yanping ZHANG, Jianchun JIANG. The Relationship Between Pore Size Distribution and Adsorption Properties of Cumaru Activated Carbon Prepared by Phosphoric Acid Method[J]. Chemistry and Industry of Forest Products, 2023, 43(1): 51-56.

Figures/Tables 4

Table 1

Table 2

Fig.1

Table 3

References 25

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样品 sample	元素分析element analysis¹⁾/%				工业分析proximate analysis²⁾/%
样品 sample	C	H	N	O^*	水分 moisture	灰分 ash	挥发分 volatile	固定碳 fixed carbon
龙凤檀cumaru	50.92	6.35	—	42.73	0.78	0.48	81.21	17.53
杉木fir	50.63	6.49	—	42.88	1.31	0.76	81.35	16.58

条件condition		碘吸附值/ (mg·g^-1) iodine value	亚甲基蓝吸附值/ (mg·g^-1) methylene blue value	焦糖脱色率/% caramel decolorization rate
活化温度 activation temperature	400 ℃	829	225	50
	450 ℃	845	240	105
	500 ℃	850	262.5	110
	550 ℃	750	270	80
	600 ℃	734	255	75
浸渍比 impregnation ratio	2∶1	683	240	40
	3∶1	850	262.5	110
	4∶1	879	262.5	112
	5∶1	813	270	115
磷酸质量分数 phosphoric acid mass fraction	40%	806	225	80
	50%	850	262.5	110
	60%	841	270	120
	70%	835	277.5	115

磷酸质量分数/% phosphoric acid mass fraction	碘吸附值/(mg·g^-1) iodine value	V_1.0-2.7/ (cm³·g^-1)	亚甲基蓝吸附值/(mg·g^-1) methylene blue value	V_1.7-5.0/ (cm³·g^-1)	焦糖脱色率/% caramel decolorization rate	V_2.7-6.3/ (cm³·g^-1)
40	806	0.311 4	225	0.309 5	80	0.211 8
48	814	0.328 2	240	0.348 4	90	0.246 0
50	850	0.410 5	262.5	0.421 4	110	0.293 5
60	841	0.396 3	270	0.471 4	120	0.362 1
70	835	0.394 9	277.5	0.462 5	115	0.328 4

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[2]	CHEN Ji-xi, ZUO Song-lin, WANG Yong-fang, HAO Jing. Electrochemical Properties of Phosphoric Acid Activated Carbon Modified by Melamine [J]. Chemistry and Industry of Forest Products, 2016, 36(2): 37-44.
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[4]	LI Cheng, WANG Li, LI Yong-fu, WANG Ren, CHEN Zheng-xing. Effects of Ozone Pretreatment on the Enzymatic Hydrolysis Efficiency of Corn Stover [J]. Chemistry and Industry of Forest Products, 2015, 35(6): 58-62.

The Relationship Between Pore Size Distribution and Adsorption Properties of Cumaru Activated Carbon Prepared by Phosphoric Acid Method

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