基于碱/尿素溶解体系的自黏结颗粒活性炭的制备

doi:10.3969/j.issn.0253-2417.2020.03.017

Abstract

Abstract:

Based on the dissolution mechanism of cellulose macromolecules in alkali/urea system, self-bonding granular activated carbon was prepared with Chinese fir as raw material. The effects of different activation temperature, alkali/urea ratio and freezing conditions on the abrasion resistance and adsorption performance of granular activated carbon were discussed. The results showed that as the activation temperature increased the abrasion resistance and adsorption performance of activated carbon increased. Under the combination effect of alkali and urea, freezing process was beneficial to promote the development of activated carbon pore structure and improve the adsorption performance. Under the optimal conditions of the activation temperature 900℃, the alkali/urea mass ratio 14:36 and freezing time for 12 h, the abrasion resistance, iodine adsorption value, methylene blue adsorption value, specific surface area, total pore volume and average pore diameter of granular activated carbon were 99.12%, 1 204 mg/g, 232 mg/g, 1 365 m²/g, 0.86 cm³/g, and 2.46 nm.

Key words: alkali/urea system, abrasion resistance, adsorption performance, pore structure

CLC Number:

TQ35
TQ424.1

Xuan YANG,Chenlu HE,Yongzhi XIONG,Guanfeng LIN,Yandan CHEN,Biao HUANG. Preparation of Self-bonding Granular Activated Carbon by Alkali/Urea Dissolution System[J]. Chemistry and Industry of Forest Products, 2020, 40(3): 130-134.

Figures/Tables 4

Table 1

Table 2

Fig.1

Table 3

References 18

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条件 conditions		耐磨强度/% abrasion resistance	碘吸附值/(mg·g^-1) iodine adsorption value	亚甲蓝吸附值/(mg·g^-1) methylene blue adsorption value
活化温度 activation temperature	700 ℃	97.64	404	52
	750 ℃	98.12	636	98
	800 ℃	98.46	819	126
	850 ℃	98.64	1056	154
	900 ℃	99.12	1204	232
NaOH用量 NaOH dosage	7%	98.56	964	141
	14%	99.12	1204	232
	21%	98.76	1075	144
	28%	98.24	955	116
	35%	97.72	780	98
尿素用量 urea dosage	12%	97.86	726	53
	24%	98.54	967	117
	36%	99.12	1204	232
	48%	98.46	1089	162
	60%	98.18	890	120

样品 samples	m(NaOH):m(尿素) m(NaOH):m(urea)	冷冻 freezing	耐磨强度/% abrasion resistance	碘吸附值/(mg·g^-1) iodine adsorption value	亚甲蓝吸附值/(mg·g^-1) methylene blue adsorption value
AC₀	14:0	是yes	97.62	864	114
AC₁	14:36	是yes	99.12	1204	232
AC_N	14:36	否no	98.42	1074	136

样品 samples	S_BET/ (m²·g^-1)	总孔容/(cm³·g^-1) total pore volume	微孔孔容/(cm³·g^-1) micropore volume	介孔孔容/(cm³·g^-1) mesopore volume	平均孔径/nm average pore size
AC₀	954	0.48	0.20	0.28	1.79
AC₁	1365	0.86	0.34	0.52	2.46
AC_N	1132	0.74	0.29	0.45	2.32

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Preparation of Self-bonding Granular Activated Carbon by Alkali/Urea Dissolution System

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