碳酸钾活化藻基生物炭吸附去除水中硝基咪唑类抗生素研究

doi:10.19964/j.issn.1006-4990.2024-0554

Abstract

Abstract:

To address the environmental challenges of resource recovery from microalgae residues and the removal of antibiotics from water，the protein-nucleated Chlorella pyrenoidosa residue was employed as a raw material to prepare potassium carbonate-activated algae-based biochar（KBC） through a simplified one-step alkaline activation method.The synthesized KBC was characterized using nitrogen adsorption-desorption apparatus，scanning electron microscope（SEM），Fourier transform infrared spectrometer（FT-IR），and elemental analyzer（EA）.The results showed that potassium carbonate-activation significantly enhanced the specific surface area and pore volume of KBC，reaching 697.70 m²/g and 0.299 3 cm³/g，respectively，while a large number of oxygen- and nitrogen-containing groups appeared on the surface of the biochar.The effects of adsorption time，adsorbent dosage，solution pH，and ionic strength on the removal performance of metronidazole（MNZ），dimetridazole（DMZ），and ornidazole（ONZ） by KBC were investigated.Rapid adsorption occurred within the first 5 min，achieving approximately 85% of the equilibrium adsorption capacity，with equilibrium reached within 2 h.The pH and ionic strength of the solution had minimal effects on the efficiency of KBC in adsorbing MNZ，DMZ，and ONZ.The adsorption behavior of MNZ and DMZ on KBC could be better described by the pseudo-second-order kinetic model and the Langmuir isotherm model，with maximum monolayer adsorption capacities of 334.28 mg/g and 302.45 mg/g，respectively.In contrast，the adsorption behavior of ONZ on KBC was more consistent with the pseudo-first-order kinetic model and the Freundlich isotherm model，indicating a multilayer adsorption process.Thermodynamic analysis confirmed that the adsorption processes were endothermic，entropy-driven，and spontaneous.The primary mechanisms underlying the adsorption of MNZ，DMZ，and ONZ by KBC were hydrogen bonding，π-π stacking interactions，and pore filling.In addition，for the adsorption of ONZ，there was also a p-π bonding interaction.KBC demonstrated excellent regeneration capabilities and superior adsorption performance，offering a novel adsorbent for the removal of nitroimidazole antibiotics and showcasing the potential of algae-based biochar in antibiotic pollution remediation.

Key words: activation by potassium carbonate, Chlorella pyrenoidosa residue, biochar, adsorbent, nitroimidazole antibiotics

CLC Number:

TQ131.13

YANG Jingjing, XU Chenchen, ZHU Liyan, KUAI Qiang, WU Bingdang, HUANG Tianyin. Study on adsorption and removal of nitroimidazole antibiotics in water by potassium carbonate-activated algae-based biochar[J]. Inorganic Chemicals Industry, 2025, 57(7): 99-109.

Figures/Tables 17

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生物炭	比表面积/（m²·g^-1）		孔容/（cm³·g^-1）		平均孔径/Å
生物炭	总孔	微孔	总孔	微孔	平均孔径/Å
BC	12.34	12.34	0.004 3	0.004 3	7.4
KBC	697.70	602.46	0.299 3	0.237 0	17.2

抗生素	准一级动力学					准二级动力学					颗粒内扩散模型
抗生素	q_m，exp/ （mg·g^-1）	k₁/ min^-1	q_e，cal/ （mg·g^-1）	R²	k₂/ min^-1	q_e，cal/ （mg·g^-1）	R²	k_1d/ （mg·g^-1·min^1/2）		k_2d/ （mg·g^-1·min^1/2）	C₁	C₂	R₁²	R₂²
MNZ	244.05	0.433 8	221.47	0.939 5	0.002 6	235.43	0.989 4		42.345 4	5.340 7	66.235 5	185.628 0	0.933 1	0.936 8
DMZ	224.34	0.597 9	204.59	0.948 9	0.004 1	215.78	0.990 2		47.168 6	4.603 9	43.533 7	175.953 1	0.966 9	0.925 6
ONZ	278.97	0.326 0	271.19	0.994 5	0.001 8	287.60	0.992 2		67.387 2	3.139 4	45.804 3	247.961 2	0.968 0	0.677 8

抗生素	Langmuir					Freundlich			Temkin
抗生素	q_m，exp/ （mg·g^-1）	q_m，cal/ （mg·g^-1）	K_L/ （L·mg^-1）	R_L	R²	1/n	K_F/（mg·g^-1）· （L·mg^-1）^1/ⁿ	R²	K_T/ （L·mg^-1）	B_T/ （J·mol^-1）	R²
MNZ	327.51	334.28	0.038 6	0.052 5	0.973 6	0.174 1	108.887 2	0.923 7	1.849 6	47.133 4	0.966 3
DMZ	298.77	302.45	0.035 2	0.023 2	0.981 7	0.173 3	98.083 5	0.934 3	1.752 4	42.605 6	0.972 7
ONZ	349.03	326.58	0.579 6	0.056 0	0.849 9	0.094 6	187.284 5	0.979 2	823.591 2	26.024 6	0.990 5

抗生素	ΔH/ （kJ·mol^-1）	ΔS/ （J·mol^-1·K^-1）	ΔG/（kJ·mol^-1）
抗生素	ΔH/ （kJ·mol^-1）	ΔS/ （J·mol^-1·K^-1）	15 ℃	25 ℃	35 ℃
MNZ	5.53	27.76	-2.44	-2.80	-2.99
DMZ	12.60	50.61	-1.96	-2.54	-2.97
ONZ	22.84	88.57	-2.60	-3.70	-4.36

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Inorganic Acid-Base-Salt Committee of CIESC

Study on adsorption and removal of nitroimidazole antibiotics in water by potassium carbonate-activated algae-based biochar

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