The selectively fluorescent sensing detection and adsorptive removal of Pb²⁺ with a stable [δ-Mo₈O₂₆]-based hybrid

Xiao-Xu Song^1,2, Huifen Fu^1,2, Peng Wang^1,2, Hai-Yan Li², Yan-Qiu Zhang³, Chong-Chen Wang^1,2*

¹ Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China

² Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China

³ State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai, 200092, China.

Abstract: A polyoxomolybdate based hybrid, [δ-Mo₈O₂₆](L)₂·2H₂O (BUC-77), was synthesized via hydrothermal method, which exhibited selectively fluorescent detection and efficient adsorptive removal toward Pb²⁺ in aqueous environment. A good linearity was observed between the fluorescence quenching percentage of BUC-77 and the Pb²⁺ concentration, along with the detection limit being 6.91 ppb. BUC-77 was stable in common solvents and wide pH range, which could be regenerated by being washed with dilute inorganic acids like HNO₃ after adsorption of Pb²⁺. The results revealed that BUC-77 could be potentially used to achieve both detection and removal of Pb²⁺ in wastewater.

Keywords: Fluorescence, adsorption, polyoxomolybdate, Pb²⁺, selective detection

https://doi.org/10.1016/j.jcis.2018.08.029