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Isolation of Thermally Stable Cellulose Nanocrystals from spent coffee grounds via Phosphoric Acid Hydrolysis

Journal of Renewable Materials 2020年第2期8卷 187-203页

作者： Brody A.Frost E.Johan Foster Virginia Tech Department of Materials Science and EngineeringMacromolecules Innovation Institute117 SurgeVirginia TechBlacksburgVA 24061USA

As the world's population exponentially grows,so does the need for the production of food,with cereal production growing annually from an estimated 1.0 billion to 2.5 billion tons within the last few *** rapid growth in food production results in an ever increasing amount of agricultural wastes,of which already occupies nearly 50%of the total landfill *** example,is the billions of dry tons of cellulose-containing spent coffee grounds disposed in landfills *** paper seeks to provide a method for isolating cellulose nanocrystals(CNCs)from spent coffee grounds,in order to recycle and utilize the cellulosic waste material which would otherwise have no *** have already been shown to have vast applications in the polymer engineering field,mainly utilized for their high strength to weight ratio for reinforcement of polymer-based nanocomposites.A successful method of purifying and hydrolyzing the spent coffee grounds in order to isolate usable CNCs was *** CNCs were then characterized using current techniques to determine important chemical and physical properties.A few crucial properties determined were aspect ratio of 12±3,crystallinity of 74.2%,surface charge density of(48.4±6.2)mM/kg cellulose,and the ability to successfully reinforce a polymer based *** characteristics compare well to other literature data and common commercial sources of CNCs.

关键词： Cellulose nanocrystals phosphoric acid hydrolysis agricultural waste industrial waste spent coffee grounds polymeric nanocomposites renewable cellulosic materials

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Pyrolytic carbon derived from spent coffee grounds as anode for sodium-ion batteries

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Carbon Resources Conversion 2018年第1期1卷 104-108页

作者： Guoliang Gao Ling-Zhi Cheong Deyu Wang Cai Shen Ningbo Institute of Materials Technology&Engineering Chinese Academy of Sciences1219 Zhongguan RoadZhenhai DistrictNingboZhejiangChina Guangzhou Key Laboratory for Special Fiber Photonic Devices South China Normal UniversityGuangzhou 510006China School of Marine Science Ningbo UniversityNingbo 315211China

This paper reported the facile preparation of pyrolytic carbon derived from spent coffee grounds and the evaluation of its electrochemical performance when used as anode in sodium-ion battery.X-ray diffraction analysis,scanning electron microscope,Brunauer–Emmett–Teller were employed to characterize the structure of pyrolytic *** performances were tested by constant current charge–discharge,cyclic voltammetry and electrochemical impedance *** showed that the pyrolytic carbon possess a porous structure(1–2 lm)and a specific surface area of 94.35 m2 g*** used as anodes in sodium-ion batteries,a reversible capacity of 154.2 mA h g1 at a current density of 200 mA g1 after 50 cycles was *** electrolytes were evaluated and their electrochemical performances were *** result indicated that this material has excellent storage capacity and good cycling *** method provided a preparation of pyrolytic carbon from environmentally friendly resources.

关键词： spent coffee grounds Sodium ion battery Anode Pyrolytic carbon

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Rheology and microstructure effects of waste spent coffee grounds in modifying asphalt binder

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Low-carbon Materials and Green Construction 2023年第1期1卷 21-33页

作者： Mingjun Xie Linglin Xu Kai Wu Yutong Wen Hongmi Jiang Zhengwu Jiang Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China Shanghai Pinghe Bilingua SchoolShanghai 201206China

Herein the biowaste by-product spent coffee grounds(SCGs)from coffee industry were incorporated into asphalt binders for performance *** the analysis of Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC),dynamic shear rheometer(DSR),and Brookfield viscosity rheometer,it is confirmed that SCGs have potential prospects as bio-waste modifiers in the application of sustainable *** demonstrated that the modification process was mainly based on physical *** with that of the neat asphalt,the shearing stress-resistant ability and high-temperature performance of the SCGs modified binders with the appropriate addition presented a bit of improvement;whereas the binders with 1%and 3%SCGs exhibited remarkably enhanced low-temperature ***,notable weaknesses of practical performance were shown for the binder with excessive content of SCGs,indicating the necessity of proportion selecting before application.

关键词： spent coffee grounds Asphalt binder Bio-waste management Rheology properties Microstructure

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