Article
Chemistry, Multidisciplinary
Reem Al Boraikan, Badr Bageri, Theis I. Solling
Summary: This study evaluates the utilization of red mud as a drilling fluid and investigates its impact on rheology and filtration performance. The results show that using red mud as a weighting agent leads to drilling fluid with relatively low plastic viscosity, gel strength, excellent sag behavior, and reasonable filtration control, even under high-pressure, high-temperature conditions. Therefore, red mud is considered a viable option for weighting agents and filtration control.
Review
Chemistry, Multidisciplinary
Pallabi Sinha Roy, Gil Garnier, Florent Allais, Kei Saito
Summary: Plastic waste, a major source of pollution, can be effectively reduced through upcycling techniques to create high-value materials and mitigate the environmental impact and production costs.
Article
Engineering, Chemical
Paolo Trucillo, Roberta Campardelli, Iolanda De Marco
Summary: This study focuses on the preparation of oral daunorubicin liposomes using the SuperLip technique, evaluating sustainability indicators and proposing process layout variations to address critical issues. Despite previous studies emphasizing solid, liquid waste, and toxic emissions in the pharmaceutical industry, the environmental sustainability of liposomes has not been explicitly analyzed.
Article
Chemistry, Physical
Jaime Jaramillo-Gutierrez, J. L. Lopez-Picon, Jose Torres-Arenas
Summary: The Thermodynamic Geometry (TG) of Mie fluids in the subcritical and supercritical region is studied using a third order thermodynamic perturbation theory equation of state (EOS). The R-crossing method of TG is applied to reproduce the coexistence curves related to Mie fluids. The behavior of the R-Widom line is analyzed and found to be dependent on the stiffness and range potential for the Mie fluids. A correspondence states principle is found for the R-Widom line, and a Clausius-Clapeyron-type relation near the critical point in the supercritical region is fulfilled.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Organic
Sebastian Fischer, Terrence-Thang H. Nguyen, Andreas Ratzenboeck, Huw M. L. Davies, Oliver Reiser
Summary: A stereoselective, solvent- and metal-free method for endocyclic C-C bond cleavage of monocyclopropanated cyclopentadienes mediated by strong acids has been developed. It leads to the formation of highly functionalized six-membered carbocycles with high stereocontrol. The critical step involves the formation of a cyclopropyl carbocation that undergoes endocyclic ring opening through an SN2'-type attack of various nucleophiles. Subsequent synthetic transformations demonstrate the versatility of the resulting cyclohexenes for the synthesis of compounds with nonconventional substitution patterns.
Article
Engineering, Chemical
Vahab Ghalandari, Soudeh Banivaheb, Jessica Peterson, Hunter Smith, M. Toufiq Reza
Summary: This study evaluated catalytic solvothermal liquefaction (STL) method for converting waste polyurethane (PU) into valuable products. The results showed that Ru/C catalyst exhibited superior performance compared to Pt/C and Pd/C catalysts.
Review
Environmental Sciences
Milica Paut Kusturica, Marija Jevtic, Jovana Trifunovic Ristovski
Summary: This article discusses the adverse effects of pharmaceuticals on the environment and proposes preventive measures to reduce their presence. These measures include rational drug use, prescribing greener drugs, improving waste management, and educating healthcare professionals and the public.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Federico Sulis, Feni Agostinho, Cecilia M. V. B. Almeida, Biagio F. Giannetti
Summary: Around one-third of global annual food production for human consumption is wasted, increasing pressure on the environment to support food supply-chains. Food waste reduction is crucial for a more sustainable world, recognized by the UN in its sustainable development goals. Food donation can help overcome social and environmental issues related to food waste, but it also comes with environmental impacts due to additional energy investment and gas emissions.
JOURNAL OF CLEANER PRODUCTION
(2021)
Review
Chemistry, Multidisciplinary
Xi Chen, Yudi Wang, Lei Zhang
Summary: This Minireview summarizes recent progress in the chemical upcycling of plastic wastes using various methods, mainly within the past three to five years. It introduces the concept of a plastic-based refinery, transforming plastic wastes into valuable compounds and discusses different chemical methods and emerging technologies.
Article
Green & Sustainable Science & Technology
Hannah Nguyen, Nabila A. Huq, Daniela Stuck, Stephen M. Tifft, Davis R. Conklin, Andrew J. Koehler, William Wilson McNeary, Gina M. Fioroni, Cameron Hays, Earl D. Christensen, Ian McNamara, Andrew Bartling, Ryan Davis, Kinga A. Unocic, Derek R. Vardon
Summary: This study examines the role of CuMAlOx catalysts in upgrading woody biomass via SCM-DHDO. The results show that CuCeAlOx exhibits the highest activity and is correlated with its high reducibility and acidity. Additionally, Cu sintering and biogenic impurity poisoning are identified as possible deactivation mechanisms. Overall, SCM-DHDO processing can produce suitable light oxygenates for gasoline bioblendstock applications.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Biochemistry & Molecular Biology
Hoda Fahim, Ali Motamedzadegan, Reza Farahmandfar, Nader Ghaffari Khaligh
Summary: According to the principles of green chemistry, glutaric anhydride was used to perform surface functionalization of HCl-hydrolyzed cellulose in a solvent-free and catalyst-free manner. The concentration of glutaric anhydride and the reaction time were found to affect the degree of substitution (DS) and zeta potential, respectively. SEM analysis showed a decrease in fiber length for the functionalized cellulose. DSC profiles revealed various temperature ranges for dehydration, glass transition, depolymerization, cleavage of glycosidic linkages, and decomposition of crystalline parts of cellulose. An efficient and greener process of functionalizing HCl-hydrolyzed cellulose was developed using glutaric anhydride without the need for a solvent or catalyst.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Review
Chemistry, Multidisciplinary
Sunil Kumar, Ekta Singh, Rahul Mishra, Aman Kumar, Serena Caucci
Summary: The advancement and modernization of industries have led to the production of a wide range of plastic products, resulting in a significant amount of plastic waste. Recycling plastic not only helps protect the environment and conserve resources, but also yields valuable recycled products through various techniques.
Article
Chemistry, Multidisciplinary
Carlos A. Navarro, Yijia Ma, Katelyn H. Michael, Hanna M. Breunig, Steven R. Nutt, Travis J. Williams
Summary: The presented catalytic, aerobic conditions enable depolymerization of amine-linked epoxy thermoset matrix polymers commonly found in high-performance CFRP materials. Unlike other recycling methods, this process retains the aligned and woven fibers in the same pattern as the parent material and recovers valuable materials from the thermoset matrix.
Article
Materials Science, Multidisciplinary
Amadou Oumarou Amadou, Gian Pietro De Gaudenzi, Giancarlo Marcheselli, Stefano Cara, Martina Piredda, Daniela Spiga, Avtar S. Matharu, Giorgia De Gioannis, Angela Serpe
Summary: The study introduces a new solvometallurgical leaching method based on diluted maleic acid ethanolic solutions, which effectively extracts cobalt from hard metals waste while maintaining mild and sustainable operating conditions. Experimental results show near quantitative cobalt removal and the possibility to finely tune the composition of WC-Co mixtures, with parameters for best leaching conditions identified. Scale-up experiments and preliminary tests on cobalt metal recovery also show promising results towards achieving resource circularity.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Raul Sanz-Horta, Enrique Martinez-Campos, Carolina Garcia, Helmut Reinecke, Alberto Gallardo, Juan Rodriguez-Hernandez, Carlos Elvira
Summary: This article describes the preparation of porous polymeric scaffolds using SCCO2 and BF techniques, resulting in a porous network with interconnected inner and outer pores. The samples were characterized by SEM and micro CT scanning, and preliminary biological evaluation was conducted to assess biocompatibility and cellular viability.
JOURNAL OF SUPERCRITICAL FLUIDS
(2021)
Article
Chemistry, Organic
Takuji Kawamoto, Kyohei Oritani, Dennis P. Curran, Akio Kamimura
Article
Chemistry, Multidisciplinary
Valerija Karaluka, Kengo Murata, Shinto Masuda, Yuto Shiramatsu, Takuji Kawamoto, Helen C. Hailes, Tom D. Sheppard, Akio Kamimura
Article
Polymer Science
Akio Kamimura, Kosuke Ikeda, Yugo Akinari, Hiroshi Matsumoto, Kouji Kaiso
POLYMER DEGRADATION AND STABILITY
(2019)
Article
Chemistry, Multidisciplinary
Akio Kamimura, Sanshiro Sakamoto, Haruka Umemoto, Takuji Kawamoto, Michinori Sumimoto
CHEMISTRY-A EUROPEAN JOURNAL
(2019)
Article
Chemistry, Organic
Akio Kamimura, Tomoyuki Itaya, Tatsuro Yoshinaga, Ryo Nozawa, Takuji Kawamoto, Michinori Sumimoto, Hidemitsu Uno
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Organic
Takuji Kawamoto, Kyohei Oritani, Atsushi Kawabata, Tsubasa Morioka, Hiroshi Matsubara, Akio Kamimura
JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Physical
Kota Ohkubo, Keiya Yanagisawa, Akio Kamimura, Kenta Fujii
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Article
Chemistry, Organic
Takuji Kawamoto, Tsubasa Morioka, Kohki Noguchi, Dennis P. Curran, Akio Kamimura
Summary: A simple and efficient procedure for nucleophilic borylation of imines without the need for a photoredox catalyst has been developed, resulting in stable products in good yields.
Article
Chemistry, Multidisciplinary
Takuji Kawamoto, Kohki Noguchi, Ryotaro Takata, Rio Sasaki, Hiroshi Matsubara, Akio Kamimura
Summary: The redox-neutral tetrafluoroethylation of alkynes with TFESA and AIBN proceeds through the formation of vinyl tetrafluoroethanesulfonates followed by a radical tetrafluoroethylation. Both experimental and theoretical results support an intermolecular reaction mechanism.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Akio Kamimura, Haruka Umemoto, Takuji Kawamoto, Takeshi Honda
Summary: This study modified the 2-phenylsulfanylhydroquinone dimer to develop two new fluorescence dyes with enhanced photophysical properties. One of the dyes showed good water solubility and formed fluorescent derivatives by reacting with bovine serum albumin in water. Both compounds exhibited similar photophysical properties and blue fluorescence under UV light irradiation.
Article
Chemistry, Organic
Takuji Kawamoto, Shunya Ikeda, Akio Kamimura
Summary: This method involves the synthesis of N-vinyl-substituted pyridones from ketones and 2-fluoropyridine in the presence of trifluoromethane sulfonic anhydride, followed by a base treatment, allowing for the use of various ketones. A preliminary mechanistic study suggests that neither vinyl triflates nor vinyl cations are likely to play major roles in this transformation.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Takuji Kawamoto, Keisuke Ikawa, Akio Kamimura
Summary: The one-pot triflation/radical trifluoromethylation/triflation of imines leads to CF3-substituted vinyl trifluoromethanesulfonamides. The reaction is suitable for various imines with different substituents and affords moderate to good yields. Vinyl trifluoromethanesulfonamides can serve as bifunctional reagents, acting as both the trifluoromethyl radical source and the radical acceptor.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Akio Kamimura, Takuji Kawamoto, Kenta Fujii
Summary: Plastics are widely used materials in modern life, but the need for effective recycling is becoming increasingly recognized. This study describes the discovery of new methods for chemically recycling plastics using ionic liquids. The ionic liquids successfully depolymerized polyamides and unsaturated polyesters, and the separation of products was achieved by developing solubility-switchable ionic liquids. These findings demonstrate the potential of ionic liquids as effective solvents for plastic recycling.
Article
Chemistry, Multidisciplinary
Akio Kamimura, Keiya Yanagisawa, Nao Kaneko, Takuji Kawamoto, Kenta Fujii
Summary: Various solubility-switchable ionic liquids were synthesized using glyceraldehyde dimethylacetal or its derivatives. The solubility of these ionic liquids depended on their structure and the number of carbon atoms in the cationic parts. One of the prepared ionic liquids showed good solubility as a solvent in organic reactions.
Article
Chemistry, Organic
Akio Kamimura, Kento Kohno, Kanako Ishido, Nobuhiro Kamohara, Takuji Kawamoto
Summary: Readily available amide-type 1,6-enyne compounds can be obtained from unsaturated N-Boc acyl amide and propargylic mesylate, which undergo a radical cascade reaction upon treatment with Bu3SnH, yielding bicyclic 2,3-dihydrostannole lactams in good yields. The regioselectivity of the reaction depends on the presence or absence of alkyne substituents, with alkyl-substituted internal alkynes selectively giving 2,3-dihydrostannoles and terminal alkynes giving a mixture of piperidine and 2,3-dihydrostannole. The reaction proceeds through a radical cascade process initiated by tin radical addition to the alkenyl terminal, followed by 5-exo-dig radical cyclization.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
