Preparation of Alkaline Titanate Material K-Ti and Its Adsorption Properties for Mn(Ⅱ)
PENG Huijing1,2,3, ZHANG Weimin1,2,3,*, LI Qianming2,3, XING Xinlong4, FAN Jing3
1 Key Laboratory of Environmental Monitoring and Management of Mines in Poyang Lake Region, Ministry of Natural Resources, East China University of Technology, Nanchang 330013, China 2 Jiangxi Provincial Key Laboratory of Genesis and Remediation of Groundwater Pollution, East China University of Technology, Nanchang 330013, China 3 School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China 4 School of Earth Sciences, East China University of Technology, Nanchang 330013, China
Abstract: In this investigation, the alkaline titanate material K-Ti was synthesized using an alkaline precipitation method with titanium oxysulfate as the precursor at ambient temperature. The properties, adsorption efficacy, and mechanisms of K-Ti were examined through static batch experiments and various characterization techniques. K-Ti appears as a rod-like composite of K1.35Ti8O16 and amorphous TiO2, featuring abundant mesoporous structures. When the initial concentration of Mn(Ⅱ) in solution was 5 mg/L with a dosage of 0.16 g/L at room temperature (25 ℃), optimal parameters for Mn(Ⅱ) adsorption onto K-Ti were found: a pH of 7 and a reaction time of 300 minutes, achieving an impressive capacity of 31.55 mg/g. The kinetics align closely with both the quasi-second-order model and Langmuir isotherm; thermodynamic analyses indicate that Mn(Ⅱ) uptake by K-Ti is spontaneous, exothermic, and increases entropy. Increasing the Mn(Ⅱ) concentration to 45 mg/L resulted in maximum adsorption capacity rising to an extraordinary 70.108 4 mg/g. By integrating fitting models with XRD, FTIR, SEM, EDS, and XPS methods, we conducted a comprehensive analysis on the adsorption dynamics facilitated by K-Ti material.Potential mechanisms include electrostatic attraction, hydroxo complexation phenomena, and ion exchange processes. K-Ti exhibits remarkable adsorptive performance without secondary pollution while maintaining high mechanical strength, making it an exceptional candidate for effective applications.
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2026, Vol. 40 
