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ACS Sustainable Chemistry & Engineering

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https://www.readbyqxmd.com/read/30416892/platinum-recovery-from-industrial-process-solutions-by-electrodeposition-redox-replacement
#1
Petteri Halli, Joonas J Heikkinen, Heini Elomaa, Benjamin P Wilson, Ville Jokinen, Kirsi Yliniemi, Sami Franssila, Mari Lundström
In the current study, platinum-present as a negligible component (below 1 ppb, the detection limit of the HR-ICP-MS at the dilutions used) in real industrial hydrometallurgical process solutions-was recovered by an electrodeposition-redox replacement (EDRR) method on pyrolyzed carbon (PyC) electrode, a method not earlier applied to metal recovery. The recovery parameters of the EDRR process were initially investigated using a synthetic nickel electrolyte solution ([Ni] = 60 g/L, [Ag] = 10 ppm, [Pt] = 20 ppm, [H2 SO4 ] = 10 g/L), and the results demonstrated an extraordinary increase of 3 × 105 in the [Pt]/[Ni] on the electrode surface cf...
November 5, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30416891/facile-and-low-environmental-impact-approach-to-prepare-thermally-conductive-nanocomposites-based-on-polylactide-and-graphite-nanoplatelets
#2
Alberto Fina, Samuele Colonna, Lorenza Maddalena, Mauro Tortello, Orietta Monticelli
In this work, the preparation of nanocomposites based on poly(l-lactide) PLLA and graphite nanoplatelets (GNP) was assessed by applying, for the first time, the reactive extrusion (REX) polymerization approach, which is considered a low environmental impact method to prepare polymer systems and which allows an easy scalability. In particular, ad hoc synthesized molecules, constituted by a pyrene end group and a poly(d-lactide) (PDLA) chain (Pyr-d), capable of interacting with the surface of GNP layers as well as forming stereoblocks during the ring-opening polymerization (ROP) of l-lactide, were used...
November 5, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30319929/solvent-free-method-for-the-copolymerization-of-labile-sugar-derived-building-blocks-into-polyamides
#3
Aleksandra A Wróblewska, Sander Stevens, Wessel Garsten, Stefaan M A De Wildeman, Katrien V Bernaerts
This research focuses on the preparation of biobased copolyamides containing biacetalized galactaric acid (GalX), namely, 2,3:4,5-di- O -isopropylidene-galactaric acid (GalXMe) and 2,3:4,5-di- O -methylene-galactaric acid (GalXH), in bulk by melt polycondensation of salt monomers. In order to allow the incorporation of temperature-sensitive sugar-derived building blocks into copolyamides at temperatures below the degradation temperature of the monomers and below their melting temperatures, a clever selection of salt monomers is required, such that the sugar-derived salt monomer dissolves in the other salt monomers...
October 1, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30221095/techno-economic-assessment-scalability-and-applications-of-aerosol-lignin-micro-and-nanoparticles
#4
Camilla Abbati de Assis, Luiz G Greca, Mariko Ago, Mikhail Yu Balakshin, Hasan Jameel, Ronalds Gonzalez, Orlando J Rojas
Lignin micro- and nanoparticles (LMNPs) synthesized from side-streams of pulp and paper and biorefinery operations have been proposed for the generation of new, high-value materials. As sustainable alternatives to particles of synthetic or mineral origins, LMNPs viability depends on scale-up, manufacturing cost, and applications. By using experimental data as primary source of information, along with industrial know-how, we analyze dry and spherical LMNPs obtained by our recently reported aerosol/atomization method...
September 4, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271693/multifunctional-heterogeneous-catalysts-for-the-selective-conversion-of-glycerol-into-methyl-lactate
#5
Zhenchen Tang, Sonia L Fiorilli, Hero J Heeres, Paolo P Pescarmona
Multifunctional catalytic systems consisting of physical mixtures of Au nanoparticles (2-3 nm) supported on metal oxides and Sn-MCM-41 nanoparticles (50-120 nm) were synthesized and investigated for the selective conversion of glycerol to methyl lactate. The Au catalyst promotes the oxidation of glycerol to trioses, whereas the solid acid Sn-MCM-41 catalyzes the rearrangement of the intermediate trioses to methyl lactate. Among the supported Au nanoparticles, Au/CuO led to the highest yield and selectivity toward methyl lactate, while the Sn-MCM-41 nanoparticles showed much better catalytic performance than a benchmark solid acid catalyst (USY zeolite)...
August 6, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30123725/co-2-switchable-solvents-as-entrainer-in-fluid-separations
#6
Boelo Schuur, Mart Nijland, Marek Blahušiak, Alberto Juan
CO2 -switchable solvents, typically neutral solvents that switch with CO2 into ionic species, were investigated for use as entrainer in fluid separations such as extractive distillation. Their switchable nature was investigated, which may facilitate liquid-liquid extraction or extractive distillation as ionic liquid (IL), whereas during regeneration their decarboxylation into the amine form prevents temperature shoot-up. Studied elements included a property screening and detailed mechanistic and kinetic studies on the switching of 2-ethylhexylamine and N , N- benzyl methylamine...
August 6, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271692/high-performance-acetylated-ioncell-f-fibers-with-low-degree-of-substitution
#7
Shirin Asaadi, Tia Kakko, Alistair W T King, Ilkka Kilpeläinen, Michael Hummel, Herbert Sixta
Cellulose acetate is one of the most important cellulose derivatives. Herein we present a method to access cellulose acetate with a low degree of substitution through a homogeneous reaction in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]). This ionic liquid has also been identified as an excellent cellulose solvent for dry-jet wet fiber spinning. Cellulose was dissolved in [DBNH][OAc] and esterified in situ to be immediately spun into modified cellulose filaments with a degree of substitution (DS) value of 0...
July 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271691/understanding-lignin-aggregation-processes-a-case-study-budesonide-entrapment-and-stimuli-controlled-release-from-lignin-nanoparticles
#8
Mika H Sipponen, Heiko Lange, Mariko Ago, Claudia Crestini
The mechanism of lignin nanoprecipitation and subsequent self-assembly was elucidated by studying generation of lignin nanoparticles (LNPs) from aqueous ethanol. LNP formation was found to follow a kinetically controlled nucleation-growth mechanism in which large lignin molecules formed the initial critical nuclei. Using this information, we demonstrate entrapment of budesonide in LNPs and subsequent pH-triggered and surfactant-responsive release of this synthetic anti-inflammatory corticosteroid. Overall, our results not only provide a promising intestinal delivery system for budesonide but also deliver fundamental mechanistic understanding for the entrapment of actives in LNPs with controlled size and release properties...
July 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271690/role-of-trace-elements-as-cofactor-an-efficient-strategy-toward-enhanced-biobutanol-production
#9
Pranhita R Nimbalkar, Manisha A Khedkar, Rishikesh S Parulekar, Vijaya K Chandgude, Kailas D Sonawane, Prakash V Chavan, Sandip B Bankar
Metabolic engineering has the potential to steadily enhance product titers by inducing changes in metabolism. Especially, availability of cofactors plays a crucial role in improving efficacy of product conversion. Hence, the effect of certain trace elements was studied individually or in combinations, to enhance butanol flux during its biological production. Interestingly, nickel chloride (100 mg L-1 ) and sodium selenite (1 mg L-1 ) showed a nearly 2-fold increase in solvent titer, achieving 16.13 ± 0.24 and 12...
July 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271689/selective-coupling-of-bioderived-aliphatic-alcohols-with-acetone-using-hydrotalcite-derived-mg-al-porous-metal-oxide-and-raney-nickel
#10
Bálint Fridrich, Marc C A Stuart, Katalin Barta
Fermentation of sugars to the so-called ABE mixture delivers a three component mixture of shorter chain oxygenates: acetone, n -butanol and ethanol. In order to convert these into liquid transportation fuels that are analogous to the currently used fossil energy carriers, novel catalytic chain elongation methods involving C-C bond formation are desired. Herein we report on a simple, non-noble-metal-based method for the highly selective coupling of 1-butanol and acetone into high molecular weight (C7-C11) ketones, as well as ABE mixtures into (C5-C11) ketones using the solid base Mg-Al-PMO in combination with small amount of Raney nickel...
July 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30023141/synthesis-and-characterization-of-lignin-hydrogels-for-potential-applications-as-drug-eluting-antimicrobial-coatings-for-medical-materials
#11
Eneko Larrañeta, Mikel Imízcoz, Jie X Toh, Nicola J Irwin, Anastasia Ripolin, Anastasia Perminova, Juan Domínguez-Robles, Alejandro Rodríguez, Ryan F Donnelly
Lignin is the second most abundant biopolymer on the planet. It is a biocompatible, cheap, environmentally friendly and readily accessible material. It has been reported that these biomacromolecules have antimicrobial activities. Consequently, lignin (LIG) has the potential to be used for biomedical applications. In the present work, a simple method to prepare lignin-based hydrogels is described. The hydrogels were prepared by combining LIG with poly(ethylene glycol) and poly(methyl vinyl ether- co -maleic acid) through an esterification reaction...
July 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30123724/iron-and-iron-oxide-nanoparticles-synthesized-using-green-tea-extract-improved-ecotoxicological-profile-and-ability-to-degrade-malachite-green
#12
Pavla Plachtová, Zdenka Medříková, Radek Zbořil, Jiří Tuček, Rajender S Varma, Blahoslav Maršálek
In recent years, iron-based nanoparticles (FeNPs) have been successfully used in environmental remediation and water treatment. This study examined ecotoxicity of two FeNPs produced by green tea extract (smGT, GTFe) and their ability to degrade malachite green (MG). Their physicochemical properties were assessed using transmission electron microscopy, X-ray powder diffraction, dynamic light scattering, and transmission Mössbauer spectroscopy. Using a battery of ecotoxicological bioassays, we determined toxicity for nine different organisms, including bacteria, cyanobacterium, algae, plants, and crustaceans...
June 6, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29910994/effect-of-n-caproate-concentration-on-chain-elongation-and-competing-processes
#13
Mark Roghair, Yuchen Liu, Julius C Adiatma, Ruud A Weusthuis, Marieke E Bruins, Cees J N Buisman, David P B T B Strik
Chain elongation is an open-culture fermentation process that facilitates conversion of organic residues with an additional electron donor, such as ethanol, into valuable n-caproate. Open-culture processes are catalyzed by an undefined consortium of microorganisms which typically also bring undesired (competing) processes. Inhibition of competing processes, such as syntrophic ethanol oxidation, will lead to a more selective n-caproate production process. In this study, we investigated the effect of n-caproate concentration on the specific activity of chain elongation and competing processes using batch inhibition assays...
June 4, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29888142/energy-efficient-ammonia-recovery-in-an-up-scaled-hydrogen-gas-recycling-electrochemical-system
#14
Philipp Kuntke, Mariana Rodrigues, Tom Sleutels, Michel Saakes, Hubertus V M Hamelers, Cees J N Buisman
Nutrient and energy recovery is becoming more important for a sustainable future. Recently, we developed a hydrogen gas recycling electrochemical system (HRES) which combines a cation exchange membrane (CEM) and a gas-permeable hydrophobic membrane for ammonia recovery. This allowed for energy-efficient ammonia recovery, since hydrogen gas produced at the cathode was oxidized at the anode. Here, we successfully up-scaled and optimized this HRES for ammonia recovery. The electrode surface area was increased to 0...
June 4, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30319930/upgrading-biodiesel-from-vegetable-oils-by-hydrogen-transfer-to-its-fatty-esters
#15
Zhiyao Lu, Valeriy Cherepakhin, Talya Kapenstein, Travis J Williams
Conversion of vegetable-derived triglycerides to fatty acid methyl esters (FAMEs) is a popular approach to the generation of biodiesel fuels and the basis of a growing industry. Drawbacks of the strategy are that (a) the glycerol backbone of the triglyceride is discarded as waste, and (2) most available natural triglycerides in the U.S. are multi-unsaturated or fully saturated, giving inferior fuel performance and causing engine problems. Here we show that catalysis by iridium complex 1 can address both of these problems through selective reduction of triglycerides high in polyunsaturation...
May 7, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271688/three-dimensional-printing-of-wood-derived-biopolymers-a-review-focused-on-biomedical-applications
#16
REVIEW
Wenyang Xu, Xiaoju Wang, Niklas Sandler, Stefan Willför, Chunlin Xu
Wood-derived biopolymers have attracted great attention over the past few decades due to their abundant and versatile properties. The well-separated three main components, i.e., cellulose, hemicelluloses, and lignin, are considered significant candidates for replacing and improving on oil-based chemicals and materials. The production of nanocellulose from wood pulp opens an opportunity for novel material development and applications in nanotechnology. Currently, increased research efforts are focused on developing 3D printing techniques for wood-derived biopolymers for use in emerging application areas, including as biomaterials for various biomedical applications and as novel composite materials for electronics and energy devices...
May 7, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29755894/divalent-cation-removal-by-donnan-dialysis-for-improved-reverse-electrodialysis
#17
Timon Rijnaarts, Nathnael T Shenkute, Jeffery A Wood, Wiebe M de Vos, Kitty Nijmeijer
Divalent cations in feedwater can cause significant decreases in efficiencies for membrane processes, such as reverse electrodialysis (RED). In RED, power is harvested from the mixing of river and seawater, and the obtainable voltage is reduced and the resistance is increased if divalent cations are present. The power density of the RED process can be improved by removing divalent cations from the fresh water. Here, we study divalent cation removal from fresh water using seawater as draw solution in a Donnan dialysis (DD) process...
May 7, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29780674/renewable-bis-pyrrolidone-based-monomers-as-components-for-thermally-curable-and-enzymatically-depolymerizable-2-oxazoline-thermoset-resins
#18
Manta Roy, Geert J Noordzij, Yara van den Boomen, Sanjay Rastogi, Carolus H R M Wilsens
In this study we describe the synthesis of bis(pyrrolidone) based dicarboxylic acids from itaconic acid and their application in 2-oxazoline resins for fully renewable thermoset materials. The monomers are obtained using a bulk aza-Michael addition of a diamine and two itaconic acid molecules using a catalytic amount of water. The monomers can be isolated in high purity after recrystallization, though their yield proved to be highly dependent on the selected diamine spacer length: In general, only the dicarboxylic acids containing diamines with an even number of methylene spacers are isolated in high yields...
April 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/30271687/selective-cleavage-of-lignin-%C3%AE-o-4-aryl-ether-bond-by-%C3%AE-etherase-of-the-white-rot-fungus-dichomitus-squalens
#19
Mila Marinović, Paula Nousiainen, Adiphol Dilokpimol, Jussi Kontro, Robin Moore, Jussi Sipilä, Ronald P de Vries, Miia R Mäkelä, Kristiina Hildén
Production of value-added compounds from a renewable aromatic polymer, lignin, has proven to be challenging. Chemical procedures, involving harsh reaction conditions, are costly and often result in nonselective degradation of lignin linkages. Therefore, enzymatic catalysis with selective cleavage of lignin bonds provides a sustainable option for lignin valorization. In this study, we describe the first functionally characterized fungal intracellular β-etherase from the wood-degrading white-rot basidiomycete Dichomitus squalens ...
March 5, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29607268/synthesis-of-bio-aromatics-from-black-liquors-using-catalytic-pyrolysis
#20
André Heeres, Niels Schenk, Inouk Muizebelt, Ricardo Blees, Bart De Waele, Arend-Jan Zeeuw, Nathalie Meyer, Rob Carr, Erwin Wilbers, Hero Jan Heeres
Bio-aromatics (benzene, toluene, xylenes, BTX) were prepared by the catalytic pyrolysis of six different black liquors using both in situ and ex situ approaches. A wide range of catalysts was screened and conditions were optimized in microscale reactors. Up to 7 wt % of BTX, based on the organic fraction of the black liquors, was obtained for both the in situ and ex situ pyrolysis ( T = 500-600 °C) using a Ga-modified H-ZSM-5 catalyst. The in situ catalytic pyrolysis of black liquors from hardwood paper mills afforded slightly higher yields of aromatics/BTX than softwood black liquors, a trend that could be confirmed by the results obtained in the ex situ catalytic pyrolysis...
March 5, 2018: ACS Sustainable Chemistry & Engineering
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