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Crystals 2017, 7(9), 270; doi:10.3390/cryst7090270

Calcium Sulfate Hemihydrate Whiskers Obtained from Flue Gas Desulfurization Gypsum and Used for the Adsorption Removal of Lead

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School of Resource and Environmental Sciences, Wuhan University, Wuhan 430074, China
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Hubei Environmental Remediation Material Engineering Technology Research Center, Wuhan University, Wuhan 430074, China
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Groundwater and Environmental System Engineering Innovation Base, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Department of Civil Engineering, Urban Construction College of Anhui Jianzhu University, Hefei 230022, China
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Authors to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 11 July 2017 / Revised: 23 August 2017 / Accepted: 1 September 2017 / Published: 4 September 2017
View Full-Text   |   Download PDF [7355 KB, uploaded 5 September 2017]   |  

Abstract

Abstract: As a recycled material, flue gas desulfurization gypsum has been used to prepare calcium sulfate hemihydrate whisker (CSHW) through hydrothermal synthesis for several decades. However, the subsequent utilization of this resultant material has not yet received considerable attention. In the present research, CSHW was successfully synthesized at a certain region, and was used for the adsorption of lead ions from aqueous solutions, thereby broadening the research field for the practical application of CSHW. Its adsorption capacity was significantly influenced by various parameters, particularly, the pH level and initial lead concentration. The pH value highly affected the hydrolysis degree of lead ions and dominated the adsorption of lead. The equilibrium isotherms under two different temperatures were simulated using Langmuir, Freundlich, and Temkin models. Both Langmuir and Temkin models showed a good fit to the data. Combined with the well-fitted pseudo-second-order model, the adsorption mechanism was thought to be a chemisorption process that was enforced by the ion exchange reaction. In addition, the specific crystal structure of CSHW revealed that ion exchange reaction occurred on the (010) and (100) facets due to their preferential growth and negatively charged property. The residual solid phase after adsorption was collected and detected using X-ray diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy. Results revealed that PbSO4 was formed on the surface of CSHW. The alkaline condition introduced the tribasic lead sulfate, and thus reduced the stability of the adsorption system. View Full-Text
Keywords: flue gas desulfurization gypsum; calcium sulfate whisker; lead removal; equilibrium study; crystal facet flue gas desulfurization gypsum; calcium sulfate whisker; lead removal; equilibrium study; crystal facet
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MDPI and ACS Style

Wang, X.; Wang, L.; Wang, Y.; Tan, R.; Ke, X.; Zhou, X.; Geng, J.; Hou, H.; Zhou, M. Calcium Sulfate Hemihydrate Whiskers Obtained from Flue Gas Desulfurization Gypsum and Used for the Adsorption Removal of Lead. Crystals 2017, 7, 270.

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