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

Authors

Nawrin Rahman Shefa
Most. Afroza Khatun
Ahmed Hasnain Jalal, The University of Texas Rio Grande Valley
M. Jasim Uddin, The University of Texas Rio Grande ValleyFollow
Md. Wasikur Rahman, The University of Texas Rio Grande ValleyFollow

Document Type

Article

Publication Date

12-2025

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.

Comments

http://creativecommons.org/licenses/by-nc/4.0/

Recommended Citation

Shefa, Nawrin Rahman, Most Afroza Khatun, Ahmed Hasnain Jalal, M. Jasim Uddin, and Md Wasikur Rahman. "Adsorption-photodegradation performance of Silver Titanate for Methylene blue removal: Kinetics, thermodynamics and isotherm studies." Cleaner Chemical Engineering 11 (2025): 100163. https://doi.org/10.1016/j.clce.2025.100163

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

Publication Title

Cleaner Chemical Engineering

DOI

10.1016/j.clce.2025.100163