TY - JOUR
T1 - Biomass facilitated phase transformation of natural hematite at high temperatures and sorption of Cd2+ and Cu2+
AU - Wang, Shengsen
AU - Zhao, Mingyue
AU - Zhou, Min
AU - Zhao, Yiting
AU - Li, Yuncong C.
AU - Gao, Bin
AU - Feng, Ke
AU - Yin, Weiqin
AU - Ok, Yong Sik
AU - Wang, Xiaozhi
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China [Grant numbers 41771349, 31772394], the Laboratory Research Fund from Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2018K21], and Laboratory Research Fund from Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product [2017]. The authors want to thank reviewers for their kind and detailed comments, which significantly improved the paper.
Funding Information:
This work was supported by the National Natural Science Foundation of China [Grant numbers 41771349 , 31772394 ], the Laboratory Research Fund from Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [ 2018K21 ], and Laboratory Research Fund from Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture /Tianjin Key Laboratory of Agro-environment and Safe-product [2017]. The authors want to thank reviewers for their kind and detailed comments, which significantly improved the paper.
Publisher Copyright:
© 2019
PY - 2019/3
Y1 - 2019/3
N2 - Phase changes of natural hematite are often practiced to improve heavy metal removal and magnetism for easy recycling. In this work, pinewood biomass (PB) and natural hematite (H) admixtures were pyrolyzed at 300, 450 and 600 °C under N2 environment to prepare HBC nanocomposites (HBC300, HBC450 and HBC600). The X-ray diffraction (XRD) confirmed the reductive transformation of hematite (crystallite size ≈ 47 nm) into magnetite (25 nm) and further to wustite (25 nm) and zerovalent iron (48 nm). The Langmuir isotherms showed that the maximum sorption capacities of HBC300, HBC450, and HBC600 were 173, 138, and 130 mmol kg−1 for Cd2+, and 359, 172, and 197 mmol kg−1 for Cu2+, respectively. The higher pH up to 5 increased sorption of both Cd2+ and Cu2+, whereas the higher ionic strength (0.05–0.4 M) decreased Cd2+ sorption. Sorption of Cd2+ and Cu2+ by HBC300 was accompanied by one order of magnitude greater cation release than HBC450 and HBC600. In a binary system, Cd2+ sorption was depressed by over four times in presence of Cu2+. Overall, ion exchange was more pronounced for HBC300, and Cu2+ was more favorably retained by specific sorption than Cd2+. The greater magnetism of HBC nanoparticles favors separation from aqueous solutions.
AB - Phase changes of natural hematite are often practiced to improve heavy metal removal and magnetism for easy recycling. In this work, pinewood biomass (PB) and natural hematite (H) admixtures were pyrolyzed at 300, 450 and 600 °C under N2 environment to prepare HBC nanocomposites (HBC300, HBC450 and HBC600). The X-ray diffraction (XRD) confirmed the reductive transformation of hematite (crystallite size ≈ 47 nm) into magnetite (25 nm) and further to wustite (25 nm) and zerovalent iron (48 nm). The Langmuir isotherms showed that the maximum sorption capacities of HBC300, HBC450, and HBC600 were 173, 138, and 130 mmol kg−1 for Cd2+, and 359, 172, and 197 mmol kg−1 for Cu2+, respectively. The higher pH up to 5 increased sorption of both Cd2+ and Cu2+, whereas the higher ionic strength (0.05–0.4 M) decreased Cd2+ sorption. Sorption of Cd2+ and Cu2+ by HBC300 was accompanied by one order of magnitude greater cation release than HBC450 and HBC600. In a binary system, Cd2+ sorption was depressed by over four times in presence of Cu2+. Overall, ion exchange was more pronounced for HBC300, and Cu2+ was more favorably retained by specific sorption than Cd2+. The greater magnetism of HBC nanoparticles favors separation from aqueous solutions.
KW - Heavy metals
KW - Ion exchange
KW - Iron oxide
KW - Pyrolysis
KW - Reduction
KW - Water and wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85060271352&partnerID=8YFLogxK
U2 - 10.1016/j.envint.2019.01.004
DO - 10.1016/j.envint.2019.01.004
M3 - Article
C2 - 30684805
AN - SCOPUS:85060271352
SN - 0160-4120
VL - 124
SP - 473
EP - 481
JO - Environment International
JF - Environment International
ER -