氮掺杂生物炭的制备及其对亚甲基蓝的吸附性能研究

doi:10.19964/j.issn.1006-4990.2024-0001

Abstract

Abstract:

Biomass lycium chinensis stalks were used as raw materials，KHCO₃ as activator，and urea as nitrogen source to explore the preparation of nitrogen-doped biochar.The morphology，structure，and surface functional groups of the produced biochar were characterized was performed using scanning electron microscopy（SEM），nitrogen adsorption-desorption instrumentation（BET），X-ray powder diffraction（XRD），Raman spectroscopy（Raman），Fourier transform infrared spectroscopy（FT-IR），and X-ray photoelectron spectroscopy（XPS）.And its adsorption behavior towards methylene blue（MB） in water was explored.The results showed that the optimal conditions for KHCO₃ to activate Lycium chinensis stalks were as follows：mass ratio of 1∶2（Lycium chinensis stalks carbonized material and KHCO₃），activation temperature of 800 ℃，and activation time of 1 h.The optimal conditions for doping urea on the surface of lycium chinensis stalks biochar（LBC） were as follows：mass ratio of 1∶4（LBC and urea），and nitrogen-doped biochar（LBC-N） was prepared by calcination at 800 ℃ for 1 h.The specific surface area of LBC and LBC-N were 940.29 m²/g and 1 169.78 m²/g，the total pore volumes were 0.57 cm³/g and 0.72 cm³/g，and the average pore sizes were 5.81 nm and 3.20 nm，respectively.All of them were mainly mesoporous biomass activated carbon materials.Under the corresponding experimental conditions，the adsorption capacities of LBC and LBC-N for MB were 542.02 mg/g and 639.20 mg/g，respectively.The Pseudo-second-order model，Intra-particle diffusion model and Langmuir isothermal model could well describe the adsorption process of MB by LBC and LBC-N.According to the physicochemical properties and adsorption experiments of nitrogenous biochar，the adsorption process of LBC-N on MB molecules was mainly a result of π-π interaction，hydrogen bonding，electrostatic attraction and other chemical effects，and the synergistic effect of physical adsorption by pore filling.

Key words: lycium chinensis stalks, nitrogen-doped biochar, urea, adsorption, methylene blue

CLC Number:

TQ127.1

WANG Ping, XU Rongsheng, SUN Dong, SHI Xiaohong, XU Wei, LI Mei. Study on preparation of nitrogen-doped biochar and its adsorption properties for methylene blue[J]. Inorganic Chemicals Industry, 2024, 56(9): 117-127.

Figures/Tables 18

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样品	相对含量/%			N元素组成/%
样品	x（C）	x（N）	x（O）	x（吡啶-N）	x（吡咯-N）	x（石墨-N）
LBC	79.28	3.60	17.12	32.16	15.79	52.05
LBC-N	75.20	8.96	15.84	26.34	25.58	48.08
LBC-N-MB	83.16	2.35	14.49	21.74	24.90	53.36

样品	颗粒内扩散模型
样品	K_int1/（mg·g^-1·min^-0.5）	C₁	R₁²	K_int2/（mg·g^-1·min^-0.5）	C₂	R₂²	K_int3/（mg·g^-1·min^-0.5）	C₃	R₃²
LBC	76.19	77.53	0.97	13.31	367.99	0.90	0.22	536.29	0.86
LBC-N	46.97	281.92	0.97	15.26	430.99	0.95	0.36	628.48	0.95

样品	Langmuir模型			Freundlich模型
样品	Q_m/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F/（mg^1-1/n·L^1/n·g^-1）	1/n	R²
LBC	617.51	0.101 6	0.992 7	379.119 0	0.472 0	0.903 4
LBC-N	719.42	0.298 9	0.995 3	421.594 4	0.133 5	0.828 3

生物质	样品	q_m/（mg·g^-1）
秸秆^［1］	NBC800-3	436.0
柳树叶^［8］	WNC-2	263.2
竹笋^［19］	BSNC-800-4	384.6
枸杞杆	LBC-N	719.4

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Study on preparation of nitrogen-doped biochar and its adsorption properties for methylene blue

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