Adsorption characteristics of sludge-based composite biochar for norfloxacin and oxytetracycline in a binary system

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-09-29 DOI:10.1016/j.bej.2025.109949

Xinhua Zhou, Ziqiang Ding, Zhihao Li, Xilin Li, Fankang Meng, Lin Lu, Letong Wang

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Abstract

Antibiotics are widely used and detected in water, posing environmental and health risks. This study prepared a sludge-based biochar composite (SBC-MMT) by co-pyrolysis of activated sludge and montmorillonite, and characterized it using SEM, FTIR, and XRD. Its adsorption performance for norfloxacin (NOR) and oxytetracycline (OTC) was evaluated in single and binary systems. In single systems at 1.20 g/L and pH 7, removal efficiencies reached 98.68 % for NOR and 85.86 % for OTC, with adsorption capacities of 106.43 mg/g and 88.54 mg/g, respectively. In binary systems at 1.20 g/L and pH 7, removal efficiencies decreased to 82.85 % for NOR and 68.65 % for OTC, with adsorption capacities of 67.04 mg/g and 54.42 mg/g, respectively, showing competitive adsorption with preference for NOR (K_NOR > K_OTC). Adsorption followed pseudo-second-order kinetics and the Freundlich model, indicating chemisorption on heterogeneous surfaces. Mechanisms included electrostatic attraction, hydrogen bonding, π-π interactions, and ion exchange. SBC-MMT embodies the “Treating Waste with Waste” concept. It is an effective, reusable adsorbent made from sludge. It provides valuable insights for optimizing wastewater treatment and reducing environmental risks.

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污泥基复合生物炭在二元体系中对诺氟沙星和土霉素的吸附特性

抗生素被广泛使用，并在水中被检测到，构成环境和健康风险。本研究通过活性污泥与蒙脱土共热解制备了污泥基生物炭复合材料（SBC-MMT），并利用SEM、FTIR和XRD对其进行了表征。考察了其对诺氟沙星（NOR）和土霉素（OTC）的单体系和双体系吸附性能。在1.20 g/L和pH 7条件下，单体系对硝态氮的去除率为98.68 %，对OTC的去除率为85.86 %，吸附量分别为106.43 mg/g和88.54 mg/g。在1.20 g/L和pH为7的二元体系中，NOR和OTC的去除率分别降至82.85 %和68.65 %，吸附量分别为67.04 mg/g和54.42 mg/g，表现出对NOR的优先竞争吸附（KNOR >； KOTC）。吸附遵循拟二级动力学和Freundlich模型，表明在非均质表面上有化学吸附。机制包括静电吸引、氢键、π-π相互作用和离子交换。SBC-MMT体现了“以废治废”的理念。它是一种有效的，可重复使用的吸附剂，由污泥制成。它为优化废水处理和降低环境风险提供了有价值的见解。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.