Three-dimensional g-C₃N₄/MgO composites as a high-performance adsorbent for removal of Pb(II) from aqueous solution

ABSTRACT

A novel, three-dimensional material of g-C₃N₄/MgO was prepared by pyrolysis method. The adsorption behavior for Pb(II) onto g-C₃N₄/MgO was systematically investigated. The adsorption experiments confirmed that the g-C₃N₄/MgO exhibited remarkable adsorption performance owing to its rough morphology and abundant active sites on the surface. The maximum adsorption capacities for Pb(II) reached to 220.3, 226.2 and 235.1 mg/g at 308 K, 318 K and 328 K, respectively. The optimum adsorbent dosage was 1.0 g/L. The adsorption kinetics and isotherm could be well described by the pseudo-second-order model and Langmuir isotherm model, respectively. The adsorption process was spontaneous and endothermic.

KEYWORDS:

• G-C₃N₄
• MgO
• composites
• adsorption
• Pb(II)

Additional information

Funding

This work was supported by the Hunan Provincial Science and Technology Plan Project, China [grant number 2016TP1007] and The Fundamental Research Funds for the Central Universities of Central South University, China [grant number 400101104], [grant number 502211726]. We acknowledge the Ministry of Agriculture Key Laboratory of Agro-Environment of the Yangtze River Plain Open Fund, China [No. 738010074], the Hunan Provincial Science and Technology Plan Project, China [No. 2016TP1007] and  the Fundamental Research Funds for the Central Universities of Central South University, China [No. 400101104/No. 502211726] and for financial support of this research.