Adsorption-photodegradation performance of Silver Titanate for Methylene blue removal: Kinetics, thermodynamics and isotherm studies

Cleaner Chemical Engineering Pub Date : 2025-03-10 DOI:10.1016/j.clce.2025.100163

Nawrin Rahman Shefa , Most. Afroza Khatun , Ahmed Hasnain Jalal , M. Jasim Uddin , Md. Wasikur Rahman

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Abstract

Silver titanate (AgTO) was synthesized via an ion-exchange reaction between sodium titanate and silver nitrate. This study investigates the efficiency of AgTO in the combined adsorption-photodegradation process for removing Methylene Blue (MB). The synthesized material was characterized using FTIR, XRD, SEM, and EDX techniques. Batch adsorption experiments were conducted to assess the effects of AgTO dosage (0.1–1.0 g/L), initial MB concentration (5–20 mg/L), pH (3–11), and temperature (313–333 K). The highest MB removal efficiency (90 %) was achieved at 313 K, pH 3, and an initial MB concentration of 5 mg/L. The photocatalytic performance of AgTO was further evaluated under an 18-Watt UV light source, confirming its effectiveness in MB degradation. Adsorption followed pseudo-second-order (PSO) kinetics, while photodegradation adhered to first-order (FO) kinetics. Thermodynamic analysis indicated that both adsorption and photodegradation were endothermic processes. The Langmuir isotherm model, with a maximum adsorption capacity of 5.24 mg/g, provided the best fit for the adsorption data. Overall, as-prepared AgTO exhibited dual-functionality in a combined adsorption-photodegradation system for MB removal, revealing its high efficiency, kinetics, and thermodynamic feasibility, thereby establishing AgTO as a promising candidate for wastewater treatment.

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钛酸银去除亚甲基蓝的吸附-光降解性能：动力学、热力学和等温线研究

采用钛酸钠与硝酸银离子交换反应合成了钛酸银（AgTO）。研究了AgTO在吸附-光降解联合过程中去除亚甲基蓝（MB）的效率。利用FTIR、XRD、SEM和EDX等技术对合成材料进行了表征。通过批量吸附实验考察了AgTO用量（0.1 ~ 1.0 g/L）、MB初始浓度（5 ~ 20 mg/L）、pH（3 ~ 11）、温度（313 ~ 333 K）对MB的影响，结果表明：在313 K、pH为3、MB初始浓度为5 mg/L的条件下，MB的去除率最高，达到90%。在18w紫外光源下进一步评价了AgTO的光催化性能，证实了其对MB降解的有效性。吸附遵循准二级动力学（PSO），而光降解遵循一级动力学（FO）。热力学分析表明，吸附和光降解均为吸热过程。Langmuir等温吸附模型最大吸附量为5.24 mg/g，对吸附数据拟合最佳。总体而言，制备的AgTO在吸附-光降解联合系统中表现出双功能，显示出其高效、动力学和热力学可行性，从而使AgTO成为一种有前景的废水处理候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Cleaner Chemical Engineering

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