Adsorption characteristics and mechanisms of ciprofloxacin on polyanion-modified laterite material

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Colloid and Polymer Science Pub Date : 2024-04-20 DOI:10.1007/s00396-024-05256-9

Thi Mai Viet Ngo, Thi Tu Anh Duong, Thi Hien Lan Nguyen, Thi To Loan Nguyen, Thi Thuy Trang Truong, Tien Duc Pham

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Abstract

In this work, polyanion polystyrene sulfonate modified laterite (PML) was used as an excellent material to remove ciprofloxacin (CFX) in water. The CFX adsorption on PML was affected by factors such as pH, PML dosage, contact time, ionic strength, and operating temperature. Under optimum conditions (pH 5; 150 min; 5 mg/mL, 10 mM NaCl, 25 °C) with an initial CFX concentration of 20 ppm, the maximum removal of CFX using PML reached greater than 96%. Langmuir isotherm model provided the best fit to the experimental results of the CFX adsorption process onto PML with the maximum capacity was 10.51 mg/g. Adsorption kinetics were in good agreement with pseudo-second-order. The ∆H⁰ value was − 12.090 kJ.mol⁻¹, and the ∆G⁰ value was − 2.345 kJ.mol⁻¹, declaring that the CFX adsorption onto PML was a spontaneous process and exothermal. Adsorption mechanisms of CFX on PML were controlled by both electrostatic interaction and non-electrostatic interaction. The adsorption constant in the Temkin model was 1.700 J/mol, and the energy value in Dubinin–Radushkevich model was 2.371 kJ/mol, proving that CFX adsorption on PML is a physical adsorption process. After five recycles, the CFX removal was still higher than 77%, while the CFX removal from wastewater was approximately 96%.

Graphical Abstract

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环丙沙星在聚阴离子改性红土材料上的吸附特性和机理

本研究采用聚阴离子聚苯乙烯磺酸盐改性红土（PML）作为去除水中环丙沙星（CFX）的优良材料。PML 对 CFX 的吸附受 pH 值、PML 用量、接触时间、离子强度和操作温度等因素的影响。在初始 CFX 浓度为 20 ppm 的最佳条件下（pH 值为 5；150 分钟；5 mg/mL、10 mM NaCl、25 °C），PML 对 CFX 的最大去除率超过 96%。兰缪尔等温线模型最符合 CFX 在 PML 上的吸附过程的实验结果，最大吸附容量为 10.51 mg/g。吸附动力学与假二阶动力学非常吻合。∆H0 值为 - 12.090 kJ.mol-1，∆G0 值为 - 2.345 kJ.mol-1，这表明 CFX 在 PML 上的吸附是一个自发过程，并且是放热的。CFX 在 PML 上的吸附机理受静电作用和非静电作用控制。Temkin 模型中的吸附常数为 1.700 J/mol，Dubinin-Radushkevich 模型中的能量值为 2.371 kJ/mol，证明 CFX 在 PML 上的吸附是一个物理吸附过程。经过五次循环后，CFX 的去除率仍高于 77%，而废水中 CFX 的去除率约为 96%。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.