Adsorption of Tetracycline in Water by Cu⁃Al Layered Bimetallic Biochar

doi:10.12422/j.issn.1672-6952.2025.01.003

Abstract

Abstract:

The pollution of tetracycline antibiotics in the water environment is increasingly serious, and the effective removal of residual antibiotics in water is an urgent problem to be solved. The co?precipitation method was used to prepare Cu?Al layered double hydroxides biochar composites (CuAl?LDH@BC) intending to remove tetracycline hydrochloride (TCH) from water. The physicochemical properties of the CuAl?LDH@BC surface were analyzed by SEM, XRD, and FTIR, and the adsorption performance of the tetracycline hydrochloride solution was revealed. The experimental results show that the adsorption process is more consistent with the quasi?second?order kinetic model and Langmuir model, and the maximum adsorption capacity of TCH is 78.68 mg/g at 298 K, and the neutral condition CuAl?LDH@BC has the best removal effect on TCH, which has strong anti?interference ability in water environment. The mechanisms involved in the adsorption of TCH by CuAl?LDH@BC may include hydrogen bonding, surface complexation, π-π interaction, and electrostatic interaction. The results show that Cu?Al layered double hydroxides and biochar composites, as low?cost and high?efficiency adsorbents, have a broad application prospect in the adsorption of tetracycline antibiotics in water.

Key words: Biochar, Copper?aluminum layered bimetal, Tetracycline hydrochloride, Adsorption, Body of water

摘要：

水环境中四环素类抗生素污染日益严重，有效去除水中残留的抗生素是当前亟待解决的问题。采用共沉淀法制备了铜铝层状双金属生物炭复合材料（CuAl?LDH@BC），通过SEM、XRD和FTIR表征手段分析了CuAl?LDH@BC表面的理化性质，并考察了其对盐酸四环素（TCH）溶液的吸附性能。结果表明，吸附过程符合准二级动力学模型和Langmuir模型，TCH在298 K的温度下的最大吸附量为78.68 mg/g，在中性条件下CuAl?LDH@BC对TCH的去除效果最佳，在水环境中抗干扰能力较强；CuAl?LDH@BC吸附TCH可能涉及的机制有氢键作用、表面络合、π-π相互作用和静电作用；研究结果证实了CuAl?LDH@BC作为低成本的高效吸附剂，在吸附水体四环素类抗生素方面应用前景广阔。

关键词: 生物炭, 铜铝层状双金属, 盐酸四环素, 吸附, 水体

CLC Number:

TQ319

Yani TANG, Ruiming YANG, Jingwen LI, Chao FEI, Bo WANG. Adsorption of Tetracycline in Water by Cu⁃Al Layered Bimetallic Biochar[J]. Journal of Liaoning Petrochemical University, 2025, 45(1): 19-26.

唐雅妮, 杨蕊铭, 李婧雯, 费超, 王博. 铜铝层状双金属生物炭吸附水体四环素的研究[J]. 辽宁石油化工大学学报, 2025, 45(1): 19-26.

Figures/Tables 10

Fig.1 SEM images of BC and CuAl?LDH@BC

Fig.2 XRD spectra of BC and CuAl?LDH@BC

Fig.3 FTIR spectra of BC, CuAl?LDH@BC, and CuAl?LDH@BC?TC

Fig.4 XPS spectra of CuAl?LDH@BC and CuAl?LDH@BC?TCH

Fig.5 Adsorption kinetics curves of TCH on CuAl?LDH@BC at different temperatures

Table 1 Kinetic fitting parameters for TCH adsorption at different temperatures

温度/K	Q_{e，实际值}/(mg·g^-1)	准一级吸附动力学模型			准二级吸附动力学模型
温度/K	Q_{e，实际值}/(mg·g^-1)	Q_{e，计算值}/(mg·g^-1)	k₁/min^-1	R²	Q_{e，计算值}/(mg·g^-1)	k₂/(g·mg·min^-1)	R²
298	40.38	37.23	0.614 9	0.957 3	39.74	0.021 0	0.994 5
308	37.73	33.95	0.306 7	0.884 6	35.90	0.015 1	0.956 8
318	33.81	30.66	0.289 6	0.910 6	32.51	0.015 2	0.968 8

Fig.6 Isotherm curves of TCH adsorption on CuAl?LDH@BC at different temperatures

Table 2 Adsorption isotherm parameters for Langmuir and Freundlich models

温度/K	Langmuir模型			Freundlich模型
温度/K	Q_m/ (mg•g^-1)	K_L/ (L•g^-1)	R²	1/n	K_F/ [mg·g⁻¹·(L·min⁻¹)^1/ⁿ ]	R²
298	78.68	0.108 7	0.991 4	3.040 5	17.90	0.903 2
308	71.56	0.069 6	0.971 6	2.657 8	12.19	0.917 4
318	69.09	0.035 5	0.971 2	2.115 0	6.57	0.966 1

Fig.7 The effect of pH on TCH adsorption

Fig.8 The influence of interfering ions and ionic strength on TCH adsorption

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