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Open AccessArticle

Removal of Different Kinds of Heavy Metals by Novel PPG-nZVI Beads and Their Application in Simulated Stormwater Infiltration Facility

1
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 102616, 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
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
4
Department of Water Conservancy and Civil Engineering, Beijing Vocational College of Agriculture, Beijing 102442, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(20), 4213; https://doi.org/10.3390/app9204213
Received: 21 August 2019 / Revised: 27 September 2019 / Accepted: 30 September 2019 / Published: 10 October 2019
Polyvinyl alcohol and pumice synthetized guar gum-nanoscale zerovalent iron beads (PPG-nZVI beads) were synthesized, and their adsorption towards Pb2+, Cu2+, and Zn2+ ions was evaluated. The adsorption kinetics of metal ions was well fitted by the pseudo-second-order model. The adsorption rate decreased followed in the order of Cu2+ > Pb2+ > Zn2+, consistent with the reduction potential of the ions. The sorption isotherm was well fitted by Langmuir model. The maximum adsorption capacity decreased followed in the order of Pb2+ > Cu2+ > Zn2+, which suggested that the strength of covalent bonds between the metal ions and surface functional groups substituted to the beads is one of the major factors in the adsorption process. Adsorption increased with the increase of pH and the largest sorption occurred at pH 5.5, while ionic strength did not significantly influence the adsorption process. The application of PPG-nZVI beads as filling materials in the simulated stormwater infiltration facility shows good removal efficiency in treating the contaminated water containing Pb2+, Cu2+, Zn2+, Cr6+, and Cd2+ and the removal rate was more than 65% at least. The results indicated that the PPG-nZVI beads could be applied as promising sorbents for purification of heavy metal contaminated water. View Full-Text
Keywords: zerovalent iron; beads; heavy metal; stormwater; infiltration; adsorption zerovalent iron; beads; heavy metal; stormwater; infiltration; adsorption
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MDPI and ACS Style

Zhang, X.; Yan, L.; Liu, J.; Zhang, Z.; Tan, C. Removal of Different Kinds of Heavy Metals by Novel PPG-nZVI Beads and Their Application in Simulated Stormwater Infiltration Facility. Appl. Sci. 2019, 9, 4213.

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