Abstract Safe and efficient delivery of therapeutic cells to sites of injury/disease in the central nervous system is a key goal for the translation of clinical cell transplantation therapies. ...Recently, ‘magnetic cell localization strategies ' have emerged as a promising and safe approach for targeted delivery of magnetic particle (MP) labeled stem cells to pathology sites. For neuroregenerative applications, this approach is limited by the lack of available neurocompatible MPs, and low cell labeling achieved in neural stem/precursor populations. We demonstrate that high magnetite content, self-sedimenting polymeric MPs unfunctionalized poly(lactic acid) coated, without a transfecting component achieve efficient labeling (≥ 90%) of primary neural stem cells (NSCs)—a ‘hard-to-label’ transplant population of major clinical relevance. Our protocols showed high safety with respect to key stem cell regenerative parameters. Critically, labeled cells were effectively localized in an in vitro flow system by magnetic force highlighting the translational potential of the methods used. From the Clinical Editor Utilizing self-sedimenting polymeric magnetic particles, the authors demonstrate an efficient method for magnetically labeling primary neural stem cells for magnetic localization in the central nervous system.
Carbon capture and storage (CCS) technologies aiming at tackling CO2 emission have attracted much attention from scientists of various backgrounds. Most CCS systems require an efficient adsorbent to ...remove CO2 from sources such as fossil fuels (pre‐combustion) or flue gas from power generation (post‐combustion). Research on developing efficient adsorbents with a substantial capacity, good stability and recyclability has grown rapidly in the past decade. Because of their high surface area, highly porous structure, and high stability, various nanoporous materials have been viewed as good candidates for this challenging task. Here, recent developments in several classes of nanoporous materials, such as zeolites, metal organic frameworks (MOFs), mesoporous silicas, carbon nanotubes, and organic cage frameworks, for CCS are examined and potential future directions for CCS technology are discussed. The main criteria for a sustainable CO2 adsorbent for industrial use are also rationalized. Moreover, catalytic transformations of CO2 to other chemical species using nanoporous catalysts and their potential for large scale carbon capture and utilization (CCU) processes are also discussed. Application of CCU technologies avoids any potential hazard associated with CO2 reservoirs and allows possible recovery of some running cost for CO2 capture by manufacturing valuable chemicals.
Nanoporous materials have shown great potential as efficient adsorbents for carbon capture and storage (CCS) technologies. An overview of the properties of these classes of nanomaterials with their advantages and limitations regarding use as CO2 adsorbents is presented. New research directions in CO2 utilization are also discussed.
In this paper, we show a novel sustainable route for the production of sorption materials for carbon capture technologies by utilizing a general plastic waste. By supporting aminated poly(vinyl ...chloride) on mesoporous silicas, a family of polymer/silica composites was synthesized, characterized and tested gravimetrically for adsorption of CO2 from the 1 : 1 v/v CO2-N2 mixture. The composites show good adsorption capacity for CO2 peaking at 12 cm3 g-1 for ethylenediamine-treated PVC products on SBA-15 support. The adsorption efficiency (CO2 : N ratio) is comparable to those observed for other nanoporous materials, such as amine-grafted mesoporous silicas. Ethylenediamine was found to be the best aminating reagent for PVC as the composite prepared from EDA-PVC gave the highest CO2 adsorption efficiency. Moreover, contact angle measurements suggested a significant improvement in hydrophobicity of the selected composites when they were compared with the unfunctionalized silica supports. This very useful development could make the composites suitable for applications in elevated moisture content environments found in flue vapours of gas-fired power plants.
In this paper, we show a novel sustainable route for the production of sorption materials for carbon capture technologies by utilizing a general plastic waste. By supporting aminated poly(vinyl ...chloride) on mesoporous silicas, a family of polymer/silica composites was synthesized, characterized and tested gravimetrically for adsorption of CO
2
from the 1 : 1 v/v CO
2
-N
2
mixture. The composites show good adsorption capacity for CO
2
peaking at 12 cm
3
g
−1
for ethylenediamine-treated PVC products on SBA-15 support. The adsorption efficiency (CO
2
: N ratio) is comparable to those observed for other nanoporous materials, such as amine-grafted mesoporous silicas. Ethylenediamine was found to be the best aminating reagent for PVC as the composite prepared from EDA-PVC gave the highest CO
2
adsorption efficiency. Moreover, contact angle measurements suggested a significant improvement in hydrophobicity of the selected composites when they were compared with the unfunctionalized silica supports. This very useful development could make the composites suitable for applications in elevated moisture content environments found in flue vapours of gas-fired power plants.
The paper presents a novel sustainable route for the production of carbon capture materials from general plastic waste.
Rising CO2 levels in the atmosphere from anthropogenic sources can be seen as one of the greatest problems faced by mankind in modern history. CO2 capture and subsequent storage or utilisation is one ...possible solution to increasing CO2 levels in the short-term, until humanity is less reliant on fossil fuels. This thesis will investigate currently available state of the art CO2 capture technologies and provide a critical evaluation on their suitability. Furthermore, current research into the storage and utilisation of captured CO2 will also be studied and the long-term suitability of these approaches to increasing CO2 levels determined. New solid-state CO2 adsorption materials have been developed using waste polymeric materials as the primary agent for selective adsorption of CO2. The approach of using waste materials for CO2 adsorption is advantageous in that the waste material is being used to deal with another waste material, namely CO2. The waste materials utilised in this research were chitosan, a waste material derived from chitin, a large waste from the seafood industry, and polyvinylchloride (PVC), a polymer mainly used in the fabrication of household products. It is demonstrated in this thesis that with minimal modification, these waste materials can be utilised for the capture of CO2 at levels comparable to that of the currently available state-of-the-art materials.
In this paper, we show a novel sustainable route for the production of sorption materials for carbon capture technologies by utilizing a general plastic waste. By supporting aminated poly(vinyl ...chloride) on mesoporous silicas, a family of polymer/silica composites was synthesized, characterized and tested gravimetrically for adsorption of CO 2 from the 1 : 1 v/v CO 2 –N 2 mixture. The composites show good adsorption capacity for CO 2 peaking at 12 cm 3 g −1 for ethylenediamine-treated PVC products on SBA-15 support. The adsorption efficiency (CO 2 : N ratio) is comparable to those observed for other nanoporous materials, such as amine-grafted mesoporous silicas. Ethylenediamine was found to be the best aminating reagent for PVC as the composite prepared from EDA–PVC gave the highest CO 2 adsorption efficiency. Moreover, contact angle measurements suggested a significant improvement in hydrophobicity of the selected composites when they were compared with the unfunctionalized silica supports. This very useful development could make the composites suitable for applications in elevated moisture content environments found in flue vapours of gas-fired power plants.
In this article, we report a new sustainable synthesis procedure for manufacturing chitosan/silica CO2 adsorbents. Chitosan is a naturally abundant material and contains amine functionality, which is ...essential for selective CO2 adsorptions. It is, therefore, ideally suited for manufacturing CO2 adsorbents on a large scale. By coating chitosan onto high‐surface‐area mesoporous silica supports, including commercial fumed silica (an economical and accessible reagent) and synthetic SBA‐15 and MCF silicas, we have prepared a new family of CO2 adsorbents, which have been fully characterised with nitrogen adsorption isotherms, thermogravimetric analysis/differential scanning calorimetry, TEM, FTIR spectroscopy and Raman spectroscopy. These adsorbents have achieved a significant CO2 adsorption capacity of up to 0.98 mmol g−1 at ambient conditions (P=1 atm and T=25 °C). The materials can also be fully regenerated/recycled on demand at temperatures as low as 75 °C with a >85 % retention of the adsorption capacity after 4 cycles, which makes them promising candidates for advanced CO2 capture, storage and utilisation technology.
It captures the carbon: Chitosan‐coated mesoporous silica materials have been prepared as a new family of CO2 adsorbents. These adsorbents have achieved a significant CO2 adsorption capacity of up to 0.98 mmol g−1 at P=1 atm and T=25 °C, and they can also be fully regenerated/recycled at temperatures as low as 75 °C.
Sustainable Carbon Dioxide Adsorbents: The cover image illustrates the concept of utilizing natural waste materials for tackling another world-wide environmental problem: global warming. Carbon ...capture has been hailed as one promising process to tackle the problem of the ever increasing emissions of carbon dioxide from industry. Liquid-phase absorbents such as amine solutions associate with high energy consumption in regeneration and reuse, whereas niche solid-state adsorbents including metal-organic frameworks and aminated mesoporous silica still require the use of organic solvents, toxic aromatics, and silanes for their relatively small scale syntheses. Chitosan, derived from a natural waste material (chitin), has amine groups on its polymeric structure, which allows the selective adsorption of acidic gases such as CO sub(2). In the Full Paper on by Gregor Sneddon, Alexey Ganin, and Humphrey Yiu at Heriot-Watt University and the University of Glasgow (Scotland), researchers demonstrate a simple method to prepare chitosan/mesoporous-silica composites for selective CO sub(2) adsorption. These materials not only show a comparable CO sub(2) adsorption capacity to some aminated mesoporous silicas, but they also allow regeneration at the low temperature of 75 degree C and retain 88% of their capacity after 4cycles. As no toxic solvents are involved and synthesis is conducted at ambient conditions, these chitosan/mesoporous-silica composites can be regarded as truly sustainable with strong potential for application in industry.
Abstract In this article, we report a new sustainable synthesis procedure for manufacturing chitosan/silica CO 2 adsorbents. Chitosan is a naturally abundant material and contains amine ...functionality, which is essential for selective CO 2 adsorptions. It is, therefore, ideally suited for manufacturing CO 2 adsorbents on a large scale. By coating chitosan onto high‐surface‐area mesoporous silica supports, including commercial fumed silica (an economical and accessible reagent) and synthetic SBA‐15 and MCF silicas, we have prepared a new family of CO 2 adsorbents, which have been fully characterised with nitrogen adsorption isotherms, thermogravimetric analysis/differential scanning calorimetry, TEM, FTIR spectroscopy and Raman spectroscopy. These adsorbents have achieved a significant CO 2 adsorption capacity of up to 0.98 mmol g −1 at ambient conditions ( P =1 atm and T =25 °C). The materials can also be fully regenerated/recycled on demand at temperatures as low as 75 °C with a >85 % retention of the adsorption capacity after 4 cycles, which makes them promising candidates for advanced CO 2 capture, storage and utilisation technology.
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