東北大学 · 공학
Qingxin Zheng 교수의 연구실은 환경 친화적이고 자원 효율적인 자원 회수 기술을 핵심으로 하며, 주로 폐전지 및 폐플라스틱 등 유해 폐기물의 고부가가치 회수를 위한 수열(하이드로터멀) 공정 기반 기술 개발에 집중하고 있습니다. 특히 리튬이온이온 배터리의 리콜 및 고분자 복합체의 분리·재활용을 위해 유기산 및 비금속 리액턴트를 활용한 친환경 추출 기반의 연속식 처리 시스템을 선도적으로 개발하고 있습니다. 또한, DME를 활용한 고효율 추출 공정과 PET/PE 복합 필름의 동시 물리적·화학적 재활용 기술까지 다각도의 자원 순환 기술을 확장하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Traditional disposal methods of biomass and plastic waste, such as landfill, combustion, and compost, no longer meet the requirements of carbon reduction, carbon neutrality, and sustainable society due to low utilization efficiency and severe pollution. As a green, efficient and environmentally-friendly method, hydrothermal technology has been paid much attention to and has already been applied to recycle or reuse various plastic and biomass wastes. No matter for the single or mixed type of wast
As one of the most important lithium-ion battery cathode materials for electric vehicles, LiMn2O4 (LMO) cathode material was used as the feedstock of metal recovery in this study. Through a hydrothermal treatment with citric acid (0.3 mol/L), Li and Mn ions were completely leached from a commercial LMO cathode material at 120 °C for 2 min. More importantly, simultaneously with complete leaching of Li and Mn ions from LMO, the Mn component was precipitated and separated as a Mn–citrate complex by
Continuous hydrothermal leaching of LiCoO<sub>2</sub> cathode materials with citric acid was firstly achieved using a customized flow system.
Glycine was applied as the leachant for the hydrothermal leaching of lithium-ion battery (LIB) cathode materials, LiCoO2 and LiNiO2, at 90–180 °C for 5–90 min. LiCoO2 was completely leached at 180 °C for 30 min. It was revealed that Co(III)–glycine complex formed first and was gradually reduced to Co(II)–glycine complex. Compared to LiCoO2, LiNiO2 required a lower temperature and shorter time for complete leaching. Different from using inorganic acids or organic acids like citric acid, pH values
This review summarized the valuable works on the extraction technologies using pure liquefied dimethyl ether (DME) as the organic solvent. DME is a colorless gas with a slight ether-like fragrance at room temperature and pressure. Due to some special properties, such as the strong ability for extracting organic compounds and water, high extraction rate, cheap price, low extraction temperature, and energy consumption, environmental friendliness, safety, and good compressibility, the application o
Abstract Multi‐layer plastic films are widely used in various fields especially for packaging, but due to complex composition, it is very difficult to recover single‐material polymers or high‐purity monomers from them after usage. In this study, we proposed a hydrothermal process for recycling PET/PE (PET: Polyethylene terephthalate; PE: Polyethylene) films. PET can be hydrolyzed to monomers of terephthalic acid (TPA) and ethylene glycol (EG). Using a hydrothermal system equipped with two filter
Here, Ni, Co, and Li ions in the leachate obtained from commercial LiCoO2/LiNiO2 cathode materials by hydrothermal leaching with citric acid were precipitated and separated in order using a series of precipitants, dimethylglyoxime (DMG), (NH4)2C2O4, and Na3PO4, respectively. The parameters including the pH value, precipitant amount, and reaction temperature were optimized during the metal separation step. Finally, the recovery rates of Ni, Co, and Li were 97.2, 96.1, and 94.1%, respectively, wit
High-quality carbonaceous microspheres were produced directly from wood sawdust by a novel hydrothermal method, combining hydrothermal carbonization and hydrothermal extraction.
