氯化锌-水蒸气协同活化玉米芯制活性炭的研究

doi:10.19964/j.issn.1006-4990.2023-0220

Abstract

Abstract:

Zinc chloride activated carbon（ZnAC） with optimal methylene blue（MB） adsorption performance was prepared from corn cob of Ningxia agricultural waste.Based on these conditions，zinc chloride and water vapor were used to prepare activated carbon（ZnHAC） at different activation temperatures.The structure and surface properties of ZnAC and ZnHAC were analyzed by BET，XRD，FT-IR，and SEM to elucidate the activation mechanism.The results showed that the optimum conditions for ZnCl₂ activation were temperature of 500 ℃，activation time of 1 h，and zinc feed mass ratio of 1.5∶1.The specific surface area of activated carbon was 2 299.75 m²/g，the cumulative pore volume was 1.28 cm³/g，and the adsorption capacity of MB was 531.56 mg/g.The mesoporous rate of the activated carbon was up to more than 95%，and the mesoporous rate was increased with the increase in temperature，indicating that increasing temperature was conducive to the formation of mesoporous.At the same temperature，compared with ZnAC _T_-1.5-1，the specific surface area and pore volume of ZnHAC _T_-1.5-1 increased significantly after water vapor was introduced，and the specific surface area of ZnHAC_800-1.5-1 was increased by 349 m²/g compared with ZnAC_800-1.5-1，and mesoporous pore volume，total pore volume，and pore size were nearly doubled，respectively.ZnHAC_800-1.5-1 activated carbon surface contained more amorphous carbon.The activation effect of water vapor at high temperatures was more pronounced.The vapor made the activation effect more significant，because of enriching the structure of activated carbon and the oxygen-containing functional groups on the surface of activated carbon，and increasing of the disordered degree of carbon structure.

Key words: corncob, zinc chloride, water vapor, activated carbon, adsorption

CLC Number:

TQ132.41

XU Rongsheng, MENG Ze, FENG Qian, WANG Ping, SUN Dong, LI Mei. Study on preparation of activated carbon from corn cob by zinc chloride and water vapor[J]. Inorganic Chemicals Industry, 2023, 55(12): 119-127.

Figures/Tables 17

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样品	V_mic/ （cm³·g^-1）	V_mes/ （cm³·g^-1）	V_tot/ （cm³·g^-1）	S_BET/ （m²·g^-1）	D_p/ nm	q_e/ （mg·g^-1）
ZnAC_400-1.5-1	0.37	0.40	0.77	1 771.66	2.18	489.24
ZnAC_500-1.5-1	0.06	1.22	1.28	2 299.75	2.23	531.56
ZnAC_600-1.5-1	0.15	1.04	1.19	2 040.72	2.33	519.82
ZnAC_700-1.5-1	0.11	0.88	0.99	1 802.30	2.34	493.67
ZnAC_800-1.5-1	0.11	0.90	1.01	1 682.62	2.40	485.02

样品	V_mic/ （cm³·g^-1）	V_mes/ （cm³·g^-1）	V_tot/ （cm³·g^-1）	S_BET/ （m²·g^-1）	D_p/ nm	q_e/ （mg·g^-1）
ZnAC_500-1.5-0.5	0.09	1.15	1.24	2 011.01	2.05	509.32
ZnAC_500-1.5-1	0.06	1.22	1.28	2 299.75	2.23	531.56
ZnAC_500-1.5-1.5	0.02	1.25	1.27	2 315.01	2.19	537.94
ZnAC_500-1.5-2	0.09	1.11	1.20	2 159.06	2.26	522.08
ZnAC_500-1.5-2.5	0.14	1.02	1.16	1 979.07	2.35	511.79

样品	V_mic/（cm³·g^-1）	V_mes/（cm³·g^-1）	V_tot/ （cm³·g^-1）	S_BET/ （m²·g^-1）	D_p/ nm	q_e/ （mg·g^-1）
ZnAC_500-0.5-1	0.36	0.40	0.76	1 460.53	2.07	476.91
ZnAC_500-1-1	0.39	0.63	1.02	2 005.23	2.04	519.73
ZnAC_500-1.5-1	0.06	1.22	1.28	2 299.75	2.23	531.56
ZnAC_500-2-1	0.27	1.32	1.59	2 093.03	2.78	526.82
ZnAC_500-2.5-1	0.16	1.48	1.64	1 803.37	3.64	507.49

样品	V_mic/ （cm³·g^-1）	V_mes/ （cm³·g^-1）	V_tot/ （cm³·g^-1）	S_BET/ （m²·g^-1）	D_p/ nm
ZnHAC_500-1.5-1	0.16	1.30	1.46	2 570.18	2.23
ZnHAC_600-1.5-1	0.15	1.44	1.59	2 240.53	2.34
ZnHAC_700-1.5-1	0.13	1.59	1.72	1 909.03	2.78
ZnHAC_800-1.5-1	0.12	2.21	2.33	2 031.98	4.58

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Study on preparation of activated carbon from corn cob by zinc chloride and water vapor

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