Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80618
Title: Multifunctional iron-biochar composites for the removal of potentially toxic elements, inherent cations, and hetero-chloride from hydraulic fracturing wastewater
Authors: Sun, Y
Yu, IKM
Tsang, DCW 
Cao, X
Lin, D
Wang, L
Graham, NJD
Alessi, DS
Komárek, M
Ok, YS
Feng, Y
Li, XD
Keywords: Engineered biochar
Fracturing wastewater treatment
Metals/metalloids
Mineral-carbon composites
Sustainable remediation
Issue Date: 2019
Publisher: Pergamon Press
Source: Environment international, 2019, v. 124, p. 521-532 How to cite?
Journal: Environment international 
Abstract: This paper evaluates a novel sorbent for the removal of potentially toxic elements, inherent cations, and hetero-chloride from hydraulic fracturing wastewater (FWW). A series of iron-biochar (Fe-BC) composites with different Fe/BC impregnation mass ratios (0.5:1, 1:1, and 2:1) were prepared by mixing forestry wood waste-derived BC powder with an aqueous FeCl3 solution and subsequently pyrolyzing them at 1000 °C in a N2-purged tubular furnace. The porosity, surface morphology, crystalline structure, and interfacial chemical behavior of the Fe-BC composites were characterized, revealing that Fe chelated with C–O bonds as C–O–Fe moieties on the BC surface, which were subsequently reduced to a C[dbnd]C bond and nanoscale zerovalent Fe (nZVI) during pyrolysis. The performance of the Fe-BC composites was evaluated for simultaneous removal of potentially toxic elements (Cu(II), Cr(VI), Zn(II), and As(V)), inherent cations (K, Na, Ca, Mg, Ba, and Sr), hetero-chloride (1,1,2-trichlorethane (1,1,2-TCA)), and total organic carbon (TOC) from high-salinity (233 g L−1 total dissolved solids (TDS)) model FWW. By elucidating the removal mechanisms of different contaminants, we demonstrated that Fe-BC (1:1) had an optimal reducing/charge-transfer reactivity owing to the homogenous distribution of nZVI with the highest Fe0/Fe2+ ratio. A lower Fe content in Fe-BC (0.5:1) resulted in a rapid exhaustion of Fe0, while a higher Fe content in Fe-BC (2:1) caused severe aggregation and oxidization of Fe0, contributing to its complexation/(co-)precipitation with Fe2+/Fe3+. All of the synthesized Fe-BC composites exhibited a high removal capacity for inherent cations (3.2–7.2 g g−1) in FWW through bridging with the C–O bonds and cation-π interactions. Overall, this study illustrated the potential efficacy and mechanistic roles of Fe-BC composites for (pre-)treatment of high-salinity and complex FWW.
URI: http://hdl.handle.net/10397/80618
ISSN: 0160-4120
DOI: 10.1016/j.envint.2019.01.047
Rights: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
The following publication Sun, Y., Iris, K. M., Tsang, D. C., Cao, X., Lin, D., Wang, L., ... & Feng, Y. (2019). Multifunctional iron-biochar composites for the removal of potentially toxic elements, inherent cations, and hetero-chloride from hydraulic fracturing wastewater. Environment international, 124, 521-532 is available at https://doi.org/10.1016/j.envint.2019.01.047
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Sun_Multifunctional_iron-biochar_composites.pdf2.27 MBAdobe PDFView/Open
Access
View full-text via PolyU eLinks SFX Query
Show full item record
PIRA download icon_1.1View/Download Contents

Page view(s)

33
Citations as of Oct 22, 2019

Download(s)

36
Citations as of Oct 22, 2019

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.