Influences of Temperature and Metal on Subcritical Hydrothermal Liquefaction of Hyperaccumulator: Implications for the Recycling of Hazardous Hyperaccumulators

Feng Qian, Xiangdong Zhu, Yuchen Liu, Quan Shi, Longhua Wu, Shicheng Zhang, Jianmin Chen, Zhiyong Ren

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Waste Sedum plumbizincicola, a zinc (Zn) hyperaccumulator during phytoremediation, was recycled via a subcritical hydrothermal liquefaction (HTL) reaction into multiple streams of products, including hydrochar, bio-oil, and carboxylic acids. Results show approximately 90% of Zn was released from the S. plumbizincicola biomass during HTL at an optimized temperature of 220 °C, and the release risk was mitigated via HTL reaction for hydrochar production. The low-Zn hydrochar (∼200 mg/kg compared to original plant of 1558 mg/kg) was further upgraded into porous carbon (PC) with high porosity (930 m2/g) and excellent capability of carbon dioxide (CO2) capture (3 mmol/g). The porosity, micropore structure, and graphitization degree of PCs were manipulated by the thermal recalcitrance of hydrochar. More importantly, results showed that the released Zn2+ could effectively promote the production of acetic acid via the oxidation of furfural (FF) and 5-(hydroxymethyl)-furfural (HMF). Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) with negative electrospray ionization analysis confirmed the deoxygenation and depolymerization reactions and the production of long chain fatty acids during HTL reaction of S. plumbizincicola. This work provides a new path for the recycling of waste hyperaccumulator biomass into value-added products.

Original languageEnglish (US)
Pages (from-to)2225-2234
Number of pages10
JournalEnvironmental Science and Technology
Volume52
Issue number4
DOIs
StatePublished - Feb 20 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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