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Interactions between Cr(VI) and the hydrochar: The electron transfer routes, adsorption mechanisms, and the accelerating effects of wood vinegar

Affiliation
School of Environment, Northeast Normal University, Changchun, PR China
Wang, Zirui;
Affiliation
School of Environment, Northeast Normal University, Changchun, PR China
Lu, Nan;
Affiliation
School of Environment, Northeast Normal University, Changchun, PR China
Cao, Xu;
Affiliation
School of Environment, Northeast Normal University, Changchun, PR China ; College of Resources and Environment, Huazhong Agricultural University, PR China
Li, Qingzi;
Affiliation
College of Resources and Environment, Northeast Agricultural University, PR China
Gong, Shangyu;
Affiliation
College of Resources and Environment, Northeast Agricultural University, PR China
Lu, Ping;
Affiliation
School of Thermal Engineering, Shandong Jianzhu University, PR China
Zhu, Ke;
Affiliation
School of Environment, Northeast Normal University, Changchun, PR China
Guan, Jiunian;
GND
143656902
Affiliation
Julius Kühn-Institute (JKI), Institute for Strategies and Technology Assessment, Germany
Feike, Til

Conversion of the low-valued invasive plant biomass into high-grade carbonaceous materials may provide a novel strategy to tackle the global issues of climate changes and exotic plant invasion. In this study, the hydrochar was fabricated from the biomass of Eupatorium adenophorum spreng. via hydrothermal carbonization (HTC) process to remove Cr(VI). The adsorption thermodynamics and kinetics were investigated via batch experiments, and the electron transfer routes and adsorption mechanisms were further revealed based on systematic characterization. The adsorption isotherms were well fitted by the Langmuir model with a maximum adsorption amount of 7.76 mg/g. The adsorption was spontaneous, and the surface adsorption and intraparticle diffusion may be the speed-limiting steps. Both -OH group and furan structures may donate the electrons to reduce Cr(VI), and the adsorption was governed by the surface complexation with the oxygen-containing functional groups including hydroxyl and carboxyl. Furthermore, the wood vinegar, as the by-product, can significantly accelerate the reduction rate of Cr(VI). Thus, this study provided a new strategy to fabricate carbonaceous materials which may facilitate to boost the carbon neutrality and control of invasive plants.

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