尿素/烟酰胺改性活性炭的制备及其甲醛吸附性能的研究

doi:10.3969/j.issn.0253-2417.2020.05.011

Abstract

Abstract:

Modified activated carbon(ACN)was prepared via dipping method with coconut shell activated carbon as precursor and urea and niacinamide as modification agents. Effects of surface chemical properties and pore structure on the adsorption performance of formaldehyde were investigated. The surface morphology, pore structure and surface functional groups were characterized by using scanning electron microscopy, N₂ adsorption isotherm and X-ray photoelectron spectroscopy, respectovely of carbon. The results revealed that the loaded particles appeared on the surface and pore of the modified activated carbon, the specific surface area and total pore volume of the modified activated carbon decreased and the number of amide and quaternary ammonium functional groups and lactone class (-C=O) oxygen functional groups increased. As the mass fractions of urea solution was 9% and the mass fractions of nicotinamide was 0.5%, the modified activated carbon ACN₃ had the most excellent adsorption capacity with the equilibrium adsorption capacity of 0.042 9 mg/g, which was 60.67% higher than that of the original activated carbon (0.026 7 mg/g), and was 2-3 times of commercial activated carbon.

Key words: activated carbon, urea, nicotinamide, formaldehyde, adsorption

CLC Number:

TQ35
TQ424.1

Kun ZHANG,Zhou XU,Wei LI,Shouxin LIU. Preparation of Urea/Nicotinamide Modified Activated Carbon and Its Formaldehyde Adsorption Performance[J]. Chemistry and Industry of Forest Products, 2020, 40(5): 75-82.

Figures/Tables 9

Table 1

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Table 2

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Table 3

References 28

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样品¹⁾ sample	烟酰胺质量分数/% mass fraction of nicotinamide	平衡吸附量/(mg·g^-1) equilibrium absorption capacities	甲醛饱和吸附量/(mg·g^-1) formaldehyde absorption capacities
AC_raw	0	0.0267	0.0332
ACN₁	0.10	0.0412	0.0418
ACN₂	0.25	0.0420	0.0424
ACN₃	0.50	0.0429	0.0430
ACN₄	1.00	0.0416	0.0419
ACN₅	3.00	0.0379	0.0385
1^#		0.0213	0.0239
2^#		0.0165	0.0180

样品 sample	烟酰胺质量分数/% mass fraction of nicotinamide	S_BET/ (m²·g^-1)	S_mic/ (m²·g^-1)	V_t/ (cm³·g^-1)	d/nm	元素分析element analysis/%
样品 sample	烟酰胺质量分数/% mass fraction of nicotinamide	S_BET/ (m²·g^-1)	S_mic/ (m²·g^-1)	V_t/ (cm³·g^-1)	d/nm	C	N	O
AC_raw	0	1148.07	835.00	0.66	3.09	96.05	1.34	2.62
ACN₁	0.10	911.53	646.91	0.49	3.12	93.24	3.63	3.13
ACN₂	0.25	919.30	602.10	0.50	4.08	92.75	3.95	3.30
ACN₃	0.50	978.32	619.79	0.62	3.11	92.31	4.09	3.60
ACN₄	1.00	925.08	648.82	0.51	3.06	92.13	4.39	3.48
ACN₅	3.00	912.40	661.18	0.49	3.07	91.87	4.81	3.52

样品 sample	N1 s				O1 s
样品 sample	吡啶类 pyridines	酰胺类 amides	季铵类 quaternary ammonium	吡啶酮 pyridone	醌类 (>C=O) quinones	酸酐及内酯类 (—C=O) anhydrides and lactones	醚类、酚类 (>C—O)ethers and phenols	羧基 (—COOH) carboxyl	水与氧气 water and oxygen
AC_raw	—	—	—	—	14.0	57.0	18.0	9.3	1.3
ACN₁	1.5	79.0	18.0	2.0	18.0	71.0	2.0	8.6	0.12
ACN₂	6.3	85.0	8.0	0.003	18.0	73.0	2.9	5.9	0.66
ACN₃	0.0024	94.0	5.6	0.73	9.9	77.0	1.6	8.7	3.3
ACN₄	0.024	82.0	18.0	0.0025	19.0	67.0	0.001	12.0	2.6
ACN₅	8.2	89.0	3.3	0.0027	18.0	66.0	4.5	8.2	2.3

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Preparation of Urea/Nicotinamide Modified Activated Carbon and Its Formaldehyde Adsorption Performance

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