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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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Ethanol production from sweet sorghum residual

引用

Frontiers of Chemical Science and Engineering 2008年第4期2卷 452-455页

作者： Jingyang BAN Jianliang YU Xu ZHANG Tianwei TAN College of Life Science and Technology Beijing Key Laboratory of BioprocessBeijing University of Chemical TechnologyBeijing 100029China

In this work,the ethanol production from sweet sorghum residue was *** sorghum res-idue was hydrolyzed with phosphoric acid under mild *** liquid hydrolysate was fermented by Pachysolen tannophilus,and the hydrolysis residue was fermented by the simultaneous saccharification and fer-mentation(SSF)using Saecharomyces cerevisiae with cel-lulase(60 FPU/g dry materials).Orthogonal experiments were carried out to investigate the effects of main reaction condition factors,such as temperature,acid concentra-tion,time and dry-matter content,on the reducing sugar *** results show that the optimal reaction condi-tions should be 120℃,80 g/L,80 min and 10%,*** these conditions,0.3024 g reducing sugar/g dry material was *** liquid hydrolysate was then fermented by *** with the highest ethanol concentration of 14.5 g/*** a water-insoluble solid con-centration of 5%,5.4 g/L ethanol was obtained after 12 h of *** total ethanol yield was 0.147 g/g dry material,which would be beneficial for the application of ethanol production from sweet sorghum residue.

关键词： cellulosic hydrolysis sweet sorghum ethanol SSF phosphoric acid hydrolysis

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