Fast and efficient removal of lead from low concentration solutions using silicotitanate

doi:10.3969/j.issn.0253-2778.2019.04.004

Journal of University of Science and Technology of China ›› 2019, Vol. 49 ›› Issue (4): 282-289.DOI: 10.3969/j.issn.0253-2778.2019.04.004

• Original Paper • Previous Articles Next Articles

Fast and efficient removal of lead from low concentration solutions using silicotitanate

ZHAO Xudong, WENG Hanqin, SHENG Liusi, YU Guobing, LIN Mingzhang

1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China; 2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; 3. Environmental Radiation Surveillance Center, Environmental Protection Department of Anhui, Hefei 230071, China; 4. Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China

Received:2018-01-28 Revised:2018-05-08 Accepted:2018-05-08 Online:2019-04-30 Published:2018-05-08

Abstract

Abstract: Sodium crystalline silicotitanate (Na-CST) and niobium substituted crystalline silicotitanate (Na-Nb/CST), which were synthesized using the hydrothermal method and characterized by X-ray diffraction (XRD), BET and scanning electron microscopy (SEM), were used to separate Pb2+ from aqueous solutions. The adsorption experiments show that their maximum adsorption ability is within pH 4.00~6.50. The adsorption process reaches equilibrium within 60 min, and the maximum adsorption quantity of Na-CST and Na-Nb/CST is 70.1 and 70.7 mg·g-1, respectively. Both materials are able to remove more than 94% of Pb2+ from water when Pb2+ concentration is at 10-9kg·L-1 level. Most interestingly, the concentration of Pb2+ could be lower than 3×10-9kg·L-1 after adsorption, much lower than the standard set by of the World Health Organization for the quality of drinking water, 1×10-8kg·L-1.

Key words: lead, adsorption, 10-9 concentration level, crystalline silicotitanate

CLC Number:

X524

ZHAO Xudong, WENG Hanqin, SHENG Liusi, YU Guobing, LIN Mingzhang. Fast and efficient removal of lead from low concentration solutions using silicotitanate[J]. Journal of University of Science and Technology of China, 2019, 49(4): 282-289.

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Fast and efficient removal of lead from low concentration solutions using silicotitanate

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