Removal of antibiotics from aqueous solution by chitosan grafted banana peel activated carbon

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-03-19 DOI:10.1016/j.molliq.2025.127431

Hawbir Muhammed Khdir, Bnar Mahmoud Ibrahim

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引用次数: 0

Abstract

Doxycycline hyclate (DOXH) and florfenicol (FF), widely used antibiotics in human and veterinary medicine, raise environmental concerns due to their presence in water sources. In this study, activated carbon (AC) synthesized from banana peel (BP) and chitosan-grafted activated carbon (AC/Cs) were successfully prepared and characterized using FTIR, BET, TGA, SEM, XRD, and DLS. AC/Cs exhibited specific surface areas of 340.2 (m²/g) and pore volumes of 0.477 cm³/g. The effects of contact time, adsorbent dose, temperature, pH, and the initial concentrations of both antibiotics on the removal efficiency of DOXH and FF were investigated using AC/Cs as the adsorbent. Adsorption experiments showed that AC/Cs effectively removed both antibiotics, with equilibrium times of 30 min for DOXH and 60 min for FF, optimal pH values of 3.5 for FF and 3.6 for DOXH, and adsorbent dosages of 0.015 g for DOXH and 0.02 g for FF. The maximum adsorption capacities (q_max) were 203.93 mg/g for DOXH and 242.13 mg/g for FF at an initial concentration of 45 mg/L. Non-linear isotherm analysis indicated that the adsorption data for AC/Cs best fit the Langmuir isotherm model. Non-linear kinetic studies, including intra-particle diffusion (IPD), Elovich, pseudo-first-order (PFO), and pseudo-second-order (PSO) models, revealed that the PSO model provided a more accurate and reliable description of the adsorption process compared to the PFO model. The AC/Cs were reusable after up to five adsorption/desorption cycles. This study highlights the potential of AC/Cs as an effective adsorbent for removing DOXH and FF antibiotics.

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强力霉素（DOXH）和氟苯尼考（FF）是人类和兽医广泛使用的抗生素，但由于它们存在于水源中，引起了环境问题。本研究成功制备了由香蕉皮（BP）合成的活性炭（AC）和壳聚糖接枝活性炭（AC/Cs），并使用傅立叶变换红外光谱（FTIR）、BET、TGA、SEM、XRD 和 DLS 对其进行了表征。AC/Cs 的比表面积为 340.2 (m2/g)，孔体积为 0.477 cm3/g。以 AC/Cs 为吸附剂，研究了接触时间、吸附剂剂量、温度、pH 值和两种抗生素初始浓度对 DOXH 和 FF 去除率的影响。吸附实验表明，AC/Cs 能有效去除这两种抗生素，其中 DOXH 的平衡时间为 30 分钟，FF 为 60 分钟；FF 的最佳 pH 值为 3.5，DOXH 为 3.6；吸附剂用量 DOXH 为 0.015 克，FF 为 0.02 克。在初始浓度为 45 毫克/升时，DOXH 和 FF 的最大吸附容量（qmax）分别为 203.93 毫克/克和 242.13 毫克/克。非线性等温线分析表明，AC/Cs 的吸附数据最符合 Langmuir 等温线模型。非线性动力学研究（包括颗粒内扩散（IPD）、埃洛维奇、伪一阶（PFO）和伪二阶（PSO）模型）表明，与 PFO 模型相比，PSO 模型对吸附过程的描述更加准确可靠。AC/Cs 经过多达五个吸附/解吸循环后可重复使用。这项研究凸显了 AC/Cs 作为一种有效吸附剂去除 DOXH 和 FF 抗生素的潜力。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.