Catalytic Valorization of Expired Fructan-Rich Food into the Biofuel 5-Ethoxymethylfurfural via a Restaurant Food Waste-Derived Carbonaceous Solid Acid
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Valorization of food waste into value-added fuels or chemicals is of considerable significance. Herein, an efficient catalytic approach was developed for transforming expired fructan-rich food (probiotics beverage powder, onion powder and garlic powder that have expired) into the biofuel, 5-ethoxymethylfurfural (EMF), via a carbonaceous solid acid synthesized by hydrothermal carbonization and sulfonation of restaurant food waste. The as-prepared restaurant food waste-derived carbonaceous solid acid catalyst (FW-SO3H) was well-characterized by a series of model physical and chemical technologies, and its catalytic performances were evaluated by the ethanolysis of expired fructan-rich food for EMF synthesis. The effects of reaction process variables were investigated. A considerable EMF yield of 52.1% from expired probiotics beverage powder was obtained in DMSO/ethanol medium at 140 °C for 4 h. EMF yields of 20.4% and 11.7% were achieved from expired onion powder and expired garlic powder, respectively. This work provides a valorization strategy for both expired fructan-rich food and restaurant food waste.
KeywordsFructan-rich food expired the shelf life Restaurant food waste Valorization Biofuel 5-Ethoxymethylfurfural
The authors gratefully acknowledge National Natural Science Foundation of China (21607119), Special Funds of the Education Department of Shaanxi Province (19JK0475), Young Talents Support Program of Colleges and Universities Association for Science and Technology of Shaanxi Province (20190420),Innovative Talents Promotion Plan-Science and Technology Innovation Group of Shaanxi Province (2019TD-025), and the 14th SSRT programme of Xi’an University of Architecture and Technology (1491) for the financial support. In addition, we thank Junping Xiang and Wen Sun for assistance with the experiments.
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