1. Cage-like octa(aminopropyl) silsesquioxane functionalized Ti3C2Tx for selective adsorption of Pb (II) ions by synergistic effect of coordination and oxidation.
- Author
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Li, Ting, Liu, Juan, Li, Xiaocheng, Zhang, Zhenyu, Mao, Jinshui, Xu, Shitong, and Ren, Sili
- Subjects
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LANGMUIR isotherms , *TRANSITION metal nitrides , *TRANSITION metal carbides , *IONS , *ION traps - Abstract
Transition metal carbides or nitride (MXene) have attracted wide attention due to their unique properties and promising applications in batteries, sensors, and catalysis. Due to its good hydrophilicity and abundant groups, it is also favored in environmental remediation. In this work, a cage-like octa(aminopropyl) silsesquioxane (POSS-NH 2) was chosen as the modifier to decorate the Ti 3 C 2 T x and an amino-rich lamellar material, Ti 3 C 2 T x /POSS-NH 2 , was prepared successfully via a dehydration condensation reaction. Ti 3 C 2 T x /POSS-NH 2 shows excellent adsorption capability toward Pb (II) ions within a wide pH range with an optimal adsorption capacity of 552.31 mg·g–1 at the pH value of 6. Even at strong acidic conditions (pH=2), the value is still as high as 283.65 mg·g–1. The Ti 3 C 2 T x /POSS-NH 2 also shows preferential selectivity for lead ions in lead-containing wastewaters containing Cu (II), Zn (II), Fe (II) and Mg (II) ions. The kinetics, isotherm, and thermodynamic analyses were also studied. It is found that the adsorption process is an endothermic one and complies with the Langmuir isothermal adsorption model. The experimental data of Pb (II) ions adsorption by Ti 3 C 2 T x /POSS-NH 2 can be well simulated with the pseudo-second-order kinetic model. XPS and FTIR results showed that the Pb (II) ions were captured by a synergistic effect of coordination of -NH 2 on the Ti 3 C 2 T x /POSS-NH 2 surface and the oxidation of oxygenated moieties in the layered structure of Ti 3 C 2 T x. The excellent properties of Ti 3 C 2 T x /POSS-NH 2 allow it to occupy an important position in the treatment of lead-containing wastewater. [Display omitted] • A novel 2D materials Ti 3 C 2 T x /POSS-NH 2 was prepared. • The maximum adsorption capacity of the material for Pb (II) ions is 552.31 mg·g–1. • The adsorption capacity of the material can reach 283.65 mg·g–1 at pH of 2. • The material will preferentially adsorb Pb (II) ions. • The adsorption of Pb (II) ions is dominated by a synergistic effect of coordination of-NH 2 on the Ti 3 C 2 T x /POSS-NH 2 surface and the oxidation of oxygenated moieties in the layered structure of Ti 3 C 2 T x [ABSTRACT FROM AUTHOR]
- Published
- 2024
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