Article
Engineering, Environmental
Yanying Hou, Lujie Liu, Qiaole He, Di Zhang, Jiayang Jin, Banghe Jiang, Liming Zhao
Summary: This study investigated the adsorption characteristics of chitooligosaccharides on ion-exchange resin and found that the adsorption equilibrium followed the Langmuir model, with adsorption capacity decreasing with increasing degree of polymerization. The adsorption kinetics were well described by the pseudo-second-order kinetic model. Liquid-film diffusion and intra-particle diffusion were identified as the rate-limiting steps for adsorption. Thermodynamic analysis revealed that the adsorption of chitooligosaccharides on HX-7 resin was spontaneous and feasible, with higher polymerization degrees leading to stronger interaction forces and more favorable adsorption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
A. A. M. Abusultan, J. A. Wood, T. Sainio, A. J. B. Kemperman, W. G. J. van der Meer
Summary: Reverse osmosis (RO) membrane technology is widely used for producing high-quality drinking water. An ion exchange resin - bipolar membrane electrodialysis hybrid process was developed for sustainable RO permeate remineralization. The most suitable resin for the remineralization process should have high selectivity for calcium and magnesium and low selectivity for monovalent ions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Applied
Barbara S. Sanchez, Claudia A. Neyertz, Maria S. Zanuttini, Carlos A. Querini, Gustavo Mendow
Summary: This paper proposes a combined process using Pd-Sn catalysts supported on an anion exchange resin to reduce nitrate content in groundwater. The results show that this catalyst is highly efficient, selective, and stable.
Article
Chemistry, Physical
Lukas Hackl, Shao-Wei Tsai, Bavisha Kalyan, Chia-Hung Hou, Ashok Gadgil
Summary: Capacitive deionization (CDI) technologies have the potential to replace reverse osmosis as cost-competitive alternatives for brackish water treatment. This study investigates the impact of co-ion sorption and faradaic side reactions on ion exchange resin functionalized desalination electrodes. The findings show that the electrically regenerated ion exchange (ERI) system effectively captures salt at low applied voltages, and Faradaic side reactions facilitate the functionality of ERI.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Esra Altiok, Fatma Sen, Joanna Wolska, Piotr Cyganowski, Marek Bryjak, Nalan Kabay, Muserref Arda, Mithat Yuksel
Summary: This research investigated the removal of boron and arsenic from geothermal water using newly synthesized gel-like chelating resins. The results showed that the novel resins were able to reduce boron and arsenic concentrations in geothermal water below permissible levels for agricultural irrigation and drinking water. The optimal resin concentration for boron removal was determined to be 2 g/L, while for arsenic removal, a resin concentration of 8 g/L was needed for 94% removal using the novel resins compared to 32 g/L for commercially available resin. Column performance characteristics of the resins were also studied and compared to a commercially available resin.
Article
Chemistry, Physical
Yihang Cheng, Lishi Wang, Shanwen Yu, Rui Min
Summary: By utilizing the green electro-mechanical polishing method, surface roughness of metallic parts can be effectively reduced, although prolonged polishing time may result in the formation of local corrosion pits.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Chemical
Anna Matskevich, Eduard Tokar, Nikita Markin, Igor Priimak, Andrei Egorin
Summary: The effect of H2SO4 and FeSO4 concentrations and temperature on the decontamination of spent ion-exchange resins was studied. It was found that increasing the solution temperature and adding FeSO4 significantly improved the efficacy of decontamination, especially under dynamic conditions. Extra washing steps were required to remove secondary adsorption under static conditions. The use of H2SO4 (1 mol/L) + FeSO4 (0.2 mol/L) solution reduced the volume of waste and equipment corrosion.
Article
Engineering, Environmental
Karl Zimmermann, Jaycee Wright, Pierre Berube, Benoit Barbeau, Madjid Mohseni
Summary: This study confirms the effectiveness and feasibility of Biological Ion Exchange (BIEX) technology in removing dissolved organic carbon (DOC). Results show that BIEX technology can achieve DOC removal levels ranging from 32% to 50% when treating inlet water with low or high sulphate and DOC concentrations. Additionally, the study found that in the secondary ion exchange mechanism, the removed anions directly exchange in charge equivalence with the released anions.
Article
Biochemistry & Molecular Biology
Lin Sun, Ananya Srinivas, Ron C. Runnebaum
Summary: The study examined the impact of key compound classes found in wine on protein removal by the ion-exchange resin, Macro-Prep (R) High S, through adsorption isotherm experiments. The results showed that changing concentrations of individual chemical components could affect the adsorption affinity and capacity parameters of the resin, with differences observed at high protein concentrations. These findings can inform the design and scale-up of ion-exchange columns for removing proteins from wines.
Article
Chemistry, Multidisciplinary
Yanying Hou, Lujie Liu, Xingxing Zhang, Yuechao Zhu, Yongjun Qiu, Liming Zhao
Summary: Ion exchange resins have been investigated as a potential material for separating chitooligosaccharides (COSs) with different degrees of polymerization. The functional groups of the resin significantly affect the adsorption behavior of COSs. This study focused on the adsorption behaviors of COSs on macroporous cation exchange resins with different functional groups, providing insights into the functional group effect on the adsorption of COSs with different degrees of polymerization.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xiaoqian Wang, Jiecheng Ji, Ming Rao, Wanhua Wu, Cheng Yang
Summary: In this study, sulfoxide- and sulfone-bridged beta-cyclodextrin dimers were synthesized for the enantiodifferentiating [4+4] photocyclodimerization of 2-anthracenecarboxylic acid. The product distribution and enantioselectivity were found to be influenced by the chemical structure of the bridged CDs. The presence of CsCl enhanced the relative yields and ee values of the slipped cyclodimers, while the reaction selectivity was affected by the pH variation of the aqueous buffer solution, indicating a multidimensional control over supramolecular photochirogenesis.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
I. Khusnutdinov, I. Goncharova, A. Safiulina, D. Safina
Summary: This study investigates the potential of obtaining oxygenates from light pyrolysis resin by reacting it with ethanol and a catalyst. The results show that an ion exchange resin modified with cobalt ions can significantly decrease the iodine value and increase the yield of oxygenates.
Article
Engineering, Chemical
Luo Linglin, Li Fashe, Zhang Huicong, Duan Yaozong, Wang Wenchao
Summary: Raw materials and production process result in the presence of various metal ions in biodiesel. The use of 732 ion-exchange resin reduces the content of alkali and alkaline earth metal ions in Jatropha biodiesel and improves the fuel quality. The ion-exchange resin effectively adsorbs alkali and alkaline earth metal ions in biodiesel and enhances its physiochemical properties.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Atefeh Azizitorghabeh, Harshit Mahandra, Juliana Ramsay, Ahmad Ghahreman
Summary: This study investigates the selective recovery of gold over copper from synthetic and real thiocyanate pregnant leach solution (PLS) using ion exchange resins. The results demonstrate that 100 g/L MTA 5011 resin can achieve 99% gold extraction and 12% copper extraction, while a solution of 0.01 M thiourea (TU) and 0.1 M H2SO4 is the most efficient for gold elution with 70% gold and 4% copper recovery.
Article
Engineering, Environmental
Dana Tran, Jennifer Weidhaas
Summary: This study explores the treatment options for munitions wastewater contaminated with the explosive NTO. It demonstrates that anion exchange resins, specifically perchlorate selective resins, can effectively adsorb and desorb NTO. The kinetic experiments suggest that equilibrium adsorption between NTO and the resins can be achieved within 120 minutes.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Rainhard Machatschek, Matthias Heuchel, Andreas Lendlein
Summary: Polyimides and polyetherimides (PEI) exhibit the capability to react with nucleophiles under mild conditions, allowing for surface properties adjustment through post-functionalization targeting phthalimide groups. Investigating surface functionalization using ultra-thin PEI films on a Langmuir trough, it was found that hydrolysis enhances film stability and activates ester formation. The direct amidation of PEI with Lewis acid catalyst resulted in free amine groups, showing a greater impact of hydrolysis on material properties when compared to amidation.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Yue Liu, Oliver E. C. Gould, Karl Kratz, Andreas Lendlein
Summary: Polymeric devices capable of controlled release of submicron particles on demand have been demonstrated using a temperature-memory polymer sheet as a matrix to embed and release polystyrene subMP based on particle size and temperature. The technology allows for sequential release of subMPs based on their size and temperature-memory effect, showing potential applications in assembly, particle sorting, and release technologies in microtechnology, catalysis, and controlled release.
Article
Materials Science, Multidisciplinary
Hanieh Moradian, Manfred Gossen, Andreas Lendlein
Summary: This study investigates the effects of different payload designs on gene co-expression, and finds that co-delivery of individual monocistronic nucleic acids is more effective than a bicistronic design.
MRS COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Lucile Tartivel, Anna M. Blocki, Steffen Braune, Friedrich Jung, Marc Behl, Andreas Lendlein
Summary: This study presents microporous hydrogels with an inverse shape-memory effect, which can change their shape through heating and cooling. These hydrogels can gently load bioactive components without causing activation, making them potential candidates for tissue regeneration.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Shuo Zhou, Xun Xu, Nan Ma, Friedrich Jung, Andreas Lendlein
Summary: Glycerol-based epoxy networks have great potential for surface functionalization, but the production process may lead to the presence of organochlorides, affecting cytotoxicity.
Article
Materials Science, Multidisciplinary
Shanshan Zhang, Yue Liu, Rainhard Machatschek, Andreas Lendlein
Summary: We report the successful production of cohesive and well-organized type I collagen ultrathin films of about 10 nm thickness using the Langmuir-Blodgett technique. Investigation of molecular behavior at the air-water interface reveals the existence and disappearance of a network structure in the protein nanosheet. Highly aligned and fibrillar structures are observed by atomic force microscopy and optical microscopy.
Article
Energy & Fuels
Natalia A. Tarazona, Rainhard Machatschek, Jennifer Balcucho, Andreas Lendlein, Jinneth Lorena Castro-Mayorga, Juan F. Saldarriaga
Summary: The production and consumption of commodity polymers are crucial for the development of modern society. Polymer-based materials play important roles in various fields such as healthcare, transport, food preservation, construction, electronics, and water management. However, considering the environmental crisis caused by plastic consumption, advanced polymers should incorporate functions that meet application demands and minimize environmental harm. This article discusses strategies to enhance the sustainability of plastics, including measuring and reducing negative impacts, using renewable sources for synthesis, designing biodegradable and recyclable materials, and enzymatic recycling for a circular bioeconomy. International cooperation is also emphasized for achieving the Sustainable Development Goals (SDGs) through leading-edge polymer-based materials.
MRS ENERGY & SUSTAINABILITY
(2022)
Article
Materials Science, Multidisciplinary
Falk Hoffmann, Rainhard Machatschek, Andreas Lendlein
Summary: This study investigates the degradation of polymers using mathematical models, comparing different chain cut mechanisms and analyzing the influence of internal molecular parameters. The results show that the shape of the degradation curve is similar for both chain cut mechanisms, and a characteristic time and maximum length of soluble fragments can be extracted to enhance the description and design of polymers.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Polymer Science
Christian Wischke, Dieter Hofmann
Summary: This study investigates the preparation of ellipsoidal polymer particles through unidirectional stretching at elevated temperatures. The resulting aspect ratios of the particles are often not precisely predictable. An elastic deformation model is used to evaluate the dimensions of the particles and suggests that it may be applicable to predict the conditions needed to prepare ellipsoids of desired aspect ratios.
Article
Polymer Science
Osamah Altabal, Christian Wischke
Summary: A procedure for mechanical analysis of free-standing PACA films using microindentation was explored to determine the effects of different side chain compositions on the material. This method may be relevant for characterizing various coating materials and assist in the design and evaluation of hybrid material devices.
Article
Pharmacology & Pharmacy
Osamah Altabal, Christian Wischke, Andreas Lendlein
Summary: The design of cavities and brittle coating layers enable a pre-defined release of different compounds through stress concentration phenomena. This proof of concept provides insights for further exploration in technology and medicine for deformation-induced on-demand dosage applications.
Editorial Material
Biochemistry & Molecular Biology
Axel T. Neffe
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Polymer Science
Muhammad Farhan, Daniel S. Hartstein, Yvonne Pieper, Marc Behl, Andreas Lendlein, Axel T. Neffe
Summary: Movements in plants, such as coiling tendrils, have inspired the development of coiling actuators in robotics. In this study, magnetically controllable multimaterial fibers (MMFs) were created, which can coil and uncoil upon stimulation from an alternating magnetic field. These MMFs have a core made of shape-memory fibers and a silicone-based soft elastomeric magnetic nanocomposite shell, allowing for reversible actuation. They show potential for use as fiber actuators in future robotics applications.
Article
Materials Science, Multidisciplinary
Makafui Y. Folikumah, Marc Behl, Andreas Lendlein, Axel T. Neffe
Summary: In situ hydrogelation of injectable precursors upon biological stimulus can be achieved under mild conditions and has potential applications in targeted tissues or enzyme detection. This study explores the use of hydrolytic enzymes to initiate the formation of covalent hydrogel networks through a cleavage-leading-to-gelation strategy. The system consists of a 4-arm polyethylene glycol-thiodepsipeptide conjugate and a maleimide functionalized 4-armed PEG. The hydrogels formed rapidly upon addition of MMP-2 or MMP-9, demonstrating the specific input of enzymatic reactions.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Sarah Kirchhecker, Ngoc Nguyen, Stefan Reichert, Karola Luetzow, Paul Eselem S. Bungu, Axel Jacobi von Wangelin, Sebastian Sandl, Axel T. Neffe
Summary: The combination of inexpensive Fe(ii) acetate with low molecular weight aliphatic carboxamides in situ generates an effective catalyst system for the ring opening polymerisation of lactones. PLLAs with high molar masses, narrow dispersity, and without racemisation were successfully produced. Furthermore, the synthesis of PLLA-PCL block copolymers with low randomness was achieved. This catalyst mixture has the potential to be used in polymers with biomedical applications.
