花生壳生物炭的改性及其吸附Pb2+性能研究

doi:10.3969/j.issn.1673-5854.2022.06.007

Abstract

Abstract:

In this study, peanut shell was used as raw material to produce biochar by pyrolysis, and the product of biochar was modified by NaOH and KMnO₄, respectively. Characterization results showed that the microstructure of the modified biochar was relatively dispersed, the pore size was decreased, and the stability was enhanced. The specific surface area of NaOH modified peanut shell biochar(AB) and KMnO₄ modified peanut shell biochar(MnB) increased up to 3.178 times and 5.065 times than that of peanut shell biochar(B), respectively. When KMnO₄ was used as modifying agent, manganese oxide was successfully fixed on the biochar. The zero point charge (pH_PZC) of B, AB, and MnB were 2.193, 2.888, and 2.466, respectively. The adsorption performance of Pb²⁺ using biochar before and after modification was investigated. It was found that the optimum pH values for the adsorption of Pb²⁺ using B, AB, and MnB were 4.5-6.5, 5.5-6.5 and 5.0-6.5, respectively. When the removal rate of Pb²⁺ was the same, the biochar dosage was MnB < AB < B, and the equilibrium adsorption time of Pb²⁺ using AB and MnB was shortened by 180 and 480 min, respectively. The adsorption kinetics model and isotherm model showed that the Pb²⁺ adsorption process was controlled by chemisorption in three biochars, and the order of adsorption rates was MnB>AB>B. The maximum theoretical adsorption amounts of AB and MnB were 53.19 and 80.65 mg/g, which were 1.38 and 2.10 times than that of B, respectively.

Key words: peanut shell, modification, Pb²⁺, sodium hydroxide, potassium permanganate

CLC Number:

TQ35
TQ424.2

Xianglin SONG, Yake LI, Dong LI, Liucheng WANG. Modification of Peanut Shell Biochar and Its Adsorption Properties of Pb²⁺[J]. Biomass Chemical Engineering, 2022, 56(6): 43-50.

Figures/Tables 12

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References 27

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样品sample	C/%	H/%	O/%	N/%	S/%	O/C	H/C
B	50.84	5.54	42.22	1.34	0.06	0.830	0.109
AB	49.42	5.36	43.18	1.98	0.06	0.874	0.108
MnB	47.97	5.20	45.03	1.76	0.04	0.939	0.108

样品 sample	比表面积/(m²·g^-1) specific surface area	平均孔径/nm average pore size	总孔容/(cm³·g^-1) total specific pore volume
B	2.703	13.280	8.970×10^-3
AB	8.591	8.820	1.894×10^-2
MnB	13.690	6.820	2.794×10^-2

样品 sample	T/K	实验吸附量/(mg·g^-1) experimental adsorption	准一级动力学模型 pseudo-first-order kinetic model			准二级动力学模型 pseudo-second kinetic model
样品 sample	T/K	实验吸附量/(mg·g^-1) experimental adsorption	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	k₂/(g·mg^-1·min^-1)	R²
B	298.15	31.93	3.311	0.001 0	0.890 5	32.05	0.006 1	1.000 0
	303.15	32.62	2.240	0.003 2	0.963 9	32.47	0.005 9	0.999 9
	308.15	33.05	2.071	0.003 0	0.972 9	32.90	0.005 8	0.999 9
	313.15	34.04	1.646	0.003 4	0.985 1	34.01	0.007 1	1.000 0
AB	298.15	45.64	2.076	0.005 2	0.963 6	45.66	0.009 1	1.000 0
	303.15	46.07	2.223	0.005 6	0.982 5	46.08	0.008 9	1.000 0
	308.15	46.77	2.718	0.004 0	0.963 6	46.95	0.008 6	1.000 0
	313.15	47.52	3.099	0.005 1	0.993 0	47.62	0.008 3	1.000 0
MnB	298.15	65.53	6.071	0.006 1	0.959 5	65.79	0.009 8	0.999 9
	303.15	66.54	6.526	0.009 5	0.987 2	66.67	0.010 9	1.000 0
	308.15	66.88	6.203	0.010 3	0.985 6	67.11	0.012 7	1.000 0
	313.15	67.20	5.827	0.009 7	0.973 6	67.57	0.016 5	1.000 0

c₀/(mg·L^-1)	B		AB		MnB
c₀/(mg·L^-1)	c_e	q_e	c_e	q_e	c_e	q_e
50	1.150	19.54	0.219 7	24.89	0.102 9	33.26
75	5.849	27.66	1.399	36.80	0.439 4	49.71
100	18.43	32.63	7.846	46.08	0.664 5	66.22
125	35.10	35.96	26.71	49.15	13.20	74.53
150	56.86	37.26	45.49	52.26	33.99	77.33
175	81.38	37.45	69.92	52.54	54.79	77.34

样品 sample	Langmuir			Freundlich
样品 sample	q_m/(mg·g^-1)	b/(L·mg^-1)	R²	k_f	1/n	R²
B	38.46	0.467 6	0.999 5	20.04	0.155 5	0.968 2
AB	53.19	0.959 2	0.999 9	39.47	0.138 0	0.971 7
MnB	80.65	2.385	0.999 5	53.43	0.117 5	0.976 7

Modification of Peanut Shell Biochar and Its Adsorption Properties of Pb²⁺

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Modification of Peanut Shell Biochar and Its Adsorption Properties of Pb2+

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Modification of Peanut Shell Biochar and Its Adsorption Properties of Pb²⁺