Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.107101
Keywords
Nano-zero-valent iron; Dispersion; Stabilization; Pb2+; Removal
Categories
Funding
- Doctoral Science Foundation of Central South University of Forestry and Technology [11180511]
- Natural Science Foundation of Hunan Province [2020JJ5984, 2018JJ3887, 2019JJ51005]
- National Natural Science Foundation of China [51979294, 51909284, 51608208]
- Training Program for Excellent Young Innovators of Changsha [kq1905064]
- Key Research and Development Program of Hunan Province [2019SK2191]
- Science and Technology Innovation Fund for Postgraduates of Central South University of Forestry and Technology [CX20192010]
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A chitosan and biochar synergistically-modified sulfurized nano-zero-valent iron was synthesized and tested for efficient removal of Pb2+ from aqueous solution. The optimal synthesis parameters were determined, and the effects of solution pH and ionic strength on Pb2+ removal were investigated. The study also revealed that the removal mechanisms involved adsorption, reduction reaction, and complexation reactions.
The safety of drinking water and food has been threatened by Pb2+ pollution. A chitosan and biochar synergistically-modified sulfurized nano-zero-valent iron was synthetized by NaBH4 reduction and tested for Pb2+ efficient removal from aqueous solution. The synthesized compound was characterized with X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), Zeta potential, Brunauer-Emmett-Teller (BET), X-ray powder diffraction (XRD), and scanning electron microscope (SEM). The optimized synthesis parameters of CS@S-nZVI/TB were determined as a 0.14 molar ratio of S/Fe and a 4 mass ratio of Fe/biochar. The removal of Pb2+ increased with the increase of the initial solution pH from 2 to 6, but it decreased slightly with the increasing ionic strength of NaCl in the solution. The removal processes fitted well with pseudo-second order, Langmuir, and Freundlich models, which indicated that both monolayer chemical and multilayer physical adsorption occurred during Pb removal. The removal process for Pb2+ was exothermic, with a maximum removal of 281.97 mg/g of Pb2+ at 25 degrees C. The removal mechanisms involved mainly adsorption, reduction reaction, and complexation reactions. Overall, these findings provide new ideas for the modification of Fe-0 and reveal the mechanism for the removal of heavy metals from wastewater by CS@S-nZVI/TB.
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