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Removal of CO2 in a multistage fluidized bed reactor by amine impregnated activated carbon: optimization using response surface methodology

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International Journal of Coal Science & Technology 2019年第3期6卷 445-458页

作者： dipa.das Sushanta k. Behera B. C. Meikap Department of Chemical Engineering Indian Institute of Technology (IIT) Kharagpur KharagpurWest Bengal 721302 India Department of Chemical Engineering School of Chemical Engineering Howard College Campus University of Kwazulu-Natal (UKZN) Durban 4041 South Africa Department of Chemical Engineering Indira Gandhi Institute of Technology (IGIT) Sarang Sarang Odisha 759146 India

Carbon dioxide (CO2) is the major component of greenhouse gas. Increase in concentration of CO2 in the atmosphere leads to global warming. To remove the CO2 from waste flue gas a four-stage counter-current multistage fluidized bed adsorber was developed and operated in continuous bubbling fluidization regime for the two丒phase system. This paper describes the optimum condition for CO2 removal efficiency in a multistage fluidized bed reactor using amine impregnated activated carbon. Response surface methodology with central composite design was used to determine the effect of three variables on the response. The variables are inlet concentration of CO2 in ppm (ranging from 3000 to 20,000), impregnation ratio of monoethanol amine (ranging from 0.2 to 0.6) and weir height in mm (20-60). The response was CO2 removal efficiency. The factor which was most influential has been identified from the analysis of variance. The optimum CO2 removal efficiency for the amine impregnated activated carbon (MEA-AC) was found to be 95.17%, at initial concentration of CO2 7312.85 ppm, chemical impregnation ratio of 0.31, and weir height 48.65 mm. From the experiment, the CO2 removal efficiency was found to be 95.97% at the same operating conditions. The predicted response was found to relevance with experimental data.

关键词： Activated carbon Response surface methodology Coconut shell Impregnation ratio Multistage fluidized bed Optimization

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Advancing MXene-based integrated microsystems with microsupercapacitors and/or sensors:Rational design,key progress,and challenging perspectives

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Journal of materiomics 2023年第6期9卷 1242-1262页

作者： Jin Jia Yuanyuan Zhu Pratteek das Jiaxin ma Sen Wang Guang Zhu Zhong-Shuai Wu key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China State key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

The escalating demand for micro/nano-sized devices,such as micro/nano-robots,intelligent portable/wearable microsystems,and implantable medical microdevices,necessitates the expeditious development of integrated microsystems incorporating energy conversion,storage,and *** bottlenecks in microscale energy storage/sensors and their integrated systems are being addressed by exploring new technologies and new materials,e.g.,MXene,holding great potential for developing lightweight and deformable integrated *** review summarizes the latest progress and milestones in the realization of MXene-based micro-supercapacitors(MSCs)and sensor arrays,and thus discusses the design fundamentals and key advancements of MXene-based energy conversion-storageconsumption integrated ***,we outline the key challenges in fabricating MXenebased MSCs/sensors and their self-powered integrated microsystems,which is crucial for their practical ***,we illuminate viable solutions to such unsolved issues and highlight the exciting opportunities.

关键词： MXene Micro-supercapacitors Sensors Self-powered Integrated microsystem

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kinetic regulation of MXene with water-in-LiCl electrolyte for high-voltage micro-supercapacitors

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National Science Review 2022年第7期9卷 97-105页

作者： Yuanyuan Zhu Shuanghao Zheng Pengfei Lu Jiaxin ma Pratteek das Feng Su Hui-Ming Cheng Zhong-Shuai Wu State key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Chinese Academy of Sciences University of Chinese Academy of Sciences Shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of Sciences Faculty of materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences Shenzhen International Graduate School Tsinghua University

MXenes are one of the key materials for micro-super capacitors(MSCs),integrating miniaturized energy-storage components with ***,the energy densities of MSCs are greatly hampered by MXenes’ narrow working potential window(typically≤0.6 V) in aqueous ele ***,we report the fabrication of high-voltage MXene-MSCs through the efficient regulation of reaction kinetics in 2 D Ti3C2TxMXene microelectrodes using a water-in-LiCl(WIL,20 m LiCl) salt gel ***,the intrinsic energy-storage mechanism of MXene microelectrodes in WIL,which is totally different from traditional electrolytes(1 m LiCl),was revealed through in situ and ex situ *** validated that the suppression of MXene oxidation at high anodic potential occurred due to the high content of WIL regulating anion intercalation in MXene electrodes,which effectively broadened the voltage window of ***,the symmetric planar MXene-MSCs presented a record operating voltage of 1.6 V,resulting in an exceptionally high volumetric energy density of 31.7 mWh *** the ultra-high ionic conductivity(69.5 mS cm-1) and ultralow freezing point(-57℃) of the WIL gel electrolyte, our MSCs could be operated in a wide temperature range of-40 to 60℃,and worked for a long duration even at-40℃,demonstrative of its practicality in extreme environments.

关键词： MXene micro-supercapacitors water-in-LiCl aqueous high voltage wide temperature

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Three‐dimensional(3D)‐printed MXene high‐voltage aqueous micro‐supercapacitors with ultrahigh areal energy density and low‐temperature tolerance

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Carbon Energy 2024年第8期6卷 36-48页

作者： Yuanyuan Zhu Qingxiao Zhang Jiaxin ma Pratteek das Liangzhu Zhang Hanqing Liu Sen Wang Hui Li Zhong‐Shuai Wu State key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhouChina Shanghai key Laboratory of Rare Earth Functional materials and Education Ministry key Laboratory of Resource Chemistry Shanghai Normal UniversityShanghaiChina University of Chinese Academy of Sciences BeijingChina Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalianChina

The rapid advancement in the miniaturization,integration,and intelligence of electronic devices has escalated the demand for customizable microsupercapacitors(MSCs)with high energy ***,efficient microfabrication of safe and high‐energy MXene MSCs for integrating microelectronics remains a significant challenge due to the low voltage window in aqueous electrolytes(typically≤0.6 V)and limited areal mass loading of MXene ***,we tackle these challenges by developing a highconcentration(18mol kg^(−1))“water‐in‐LiBr”(WiB)gel electrolyte for MXene symmetric MSCs(M‐SMSCs),demonstrating a record high voltage window of 1.8 ***,additive‐free aqueous MXene ink with excellent rheological behavior is developed for three‐dimensional(3D)printing customizable all‐MXene microelectrodes on various *** the synergy of a highvoltage WiB gel electrolyte and 3D‐printed microelectrodes,quasi‐solid‐state MSMSCs operating stably at 1.8 V are constructed,and achieve an ultrahigh areal energy density of 1772μWhcm^(−2) and excellent low‐temperature tolerance,with a long‐term operation at−40℃.Finally,by extending the 3D printing protocol,M‐SMSCs are integrated with humidity sensors on a single planar substrate,demonstrating their reliability in miniaturized integrated microsystems.

关键词： 3D printing aqueous electrolyte high voltage micro‐supercapacitors MXene

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Colorectal cancer cell growth inhibition by linoleic acid is related to fatty acid composition changes

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第12期11卷 923-930页

作者： Xiao-feng LU Guo-qing HE Hai-ning YU Qi ma Sheng-rong SHEN Undurti N. das Department of Food Science and Nutrition College of Biosystems Engineering and Food Science Zhejiang University Hangzhou 310029 China College of Pharmaceutical Sciences Zhejiang University of Technology Hangzhou 310032 China UND Life Sciences Shaker Heights OH 44120 USA College of Medicine Bharati Vidyapeeth University Pune 411030 India

Polyunsaturated fatty acids （PUFAs） possess anti-cancer action both in vitro and in vivo. In the present study, we detected cell viability with methyl thiazolyl tetrazolium （MTT） assay and cell membrane permeability with propidium iodide （PI） fluorescence dyeing, and calculated cell membrane fluidity change as fluorescence anisotropy. Fatty acid content in cells was measured by gas chromatography/mass spectroscopy （GC/MS）, and the relationship between fatty acid composition and cell viability was studied. We observed that n-6 PUFA linoleic acid （LA） inhibited tumor cell growth at high concentrations （〉300 μmol/L）, while low concentrations （100-200 μmol/L） seemed to promote cell proliferation. Analyses of cell membrane permeability, cell membrane fluidity, and cell fatty acid composition suggested that the anti-cancer action of LA could be related to changes in the ratio of n-6 to n-3 PUFAs. We observed that pre-incubation of cancer cells with 100 μmol/L LA for 24 h enhanced cell sensitivity to the cytotoxic action of LA, whereas undifferentiated cell line LoVo seemed to have a distinct path in LA-induced death. These results showed that one of the mechanisms by which supplementation of LA induces cancer cell death could be altering the ratio of n-6/n-3 PUFAs, and this may be related to celt differentiation status.

关键词： Anti-cancer Fatty acids composition Linoleic acid In vitro

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2.4 V ultrahigh-voltage aqueous MXene-based asymmetric micro-supercapacitors with high volumetric energy density toward a self-sufficient integrated microsystem

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Fundamental Research 2024年第2期4卷 307-314页

作者： Yuanyuan Zhu Shuanghao Zheng Jieqiong Qin Jiaxin ma Pratteek das Feng Zhou Zhong-Shuai Wu State key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China College of Science Henan Agricultural UniversityZhengzhou 450002China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Two-dimensional MXenes are key high-capacitance electrode materials for micro-supercapacitors(MSCs)catering to integrated ***,the narrow electrochemical voltage windows of conventional aqueous electrolytes(≤1.23 V)and symmetric MXene MSCs(typically≤0.6 V)substantially limit their output voltage and energy *** concentrated aqueous electrolytes exhibit lower water molecule activity,which inhibits water splitting and consequently widens the operating voltage ***,we report ultrahigh-voltage aqueous planar asymmetric MSCs(AMSCs)based on a highly concentrated LiCl-gel quasi-solid-state electrolyte with MXene(Ti3C2Tx)as the negative electrode and MnO_(2) nanosheets as the positive electrode(MXene//MnO_(2)-AMSCs).The MXene//MnO_(2)-AMSCs exhibit a high voltage of up to 2.4 V,attaining an ultrahigh volumetric energy density of 53 mWh cm−***,the in-plane geometry and the quasi-solid-state electrolyte enabled excellent mechanical flexibility and performance uniformity in the serially/parallel connected packs of our ***,the MXene//MnO_(2)-AMSC-based integrated microsystem,in conjunction with solar cells and consumer electronics,could efficiently realize simultaneous energy harvesting,storage,and *** findings of this study provide insights for constructing high-voltage aqueous MXene-based AMSCs as safe and self-sufficient micropower sources in smart integrated microsystems.

关键词： Asymmetric micro-supercapacitors MXene MnO_(2) Aqueous electrolyte High voltage Integrated microsystem

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Trophic Ecology of Ansonia latidisca at Gunung Penrissen, Sarawak, North-Western Borneo

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Asian Herpetological Research 2021年第2期12卷 250-260页

作者： Jia Jet ONG Indraneil das Institute of Biodiversity ami Environmental Conservation Universiti Malaysia SarawakKota Samamhan 94300SaniwakMalaysiii

Dietary data on Ansonia latidisca, the little known Bornean Rainbow Toad, are presented, through an investigation of a population at Gunung Penrissen, Sarawak, malaysia(north-western Borneo), at elevations between 1,100–1,229 m asl. Standard sampling techniques, including visual encounter surveys, were employed and individuals encountered stomach-flushed, ma rked, a nd released. The volume of food ingested by adults, apart from large females, did not vary monthly, and there was no significant difference between wet and dry periods, the dominance index between the two periods showing no significant difference, indicating that seasonal variation does not affect the dietary constitution of the species across months. The mean longest prey was recovered from a female in march, during the end of the wet season. Larger individuals did not consume larger prey in the species, although larger females did harvest the largest insects, and as may be expected, had fewer prey items in their stomachs at the time. males fed on fewer prey items than females, the adult male diet predominantly comprised of members of the Hymenoptera, including formicids(ants), as indicated by percentage frequency of occurrence of 78.69, while for adult females, equivalent figure was 90.70. Coleopterans(beetles) were found secondary in importance(48.8% in females, 5.85% in males), the rest categorized as tertiary. Plant items(including bryophytes) had a high frequency of occurrence(23.3% in females, 4.64% in males). Females examined in the month of July had voluminous stomach contents, and may have eaten more to increase fat reserves for breeding in the upcoming wet season. Since the diet of all size classes consisted of hymenopterans(ants) and coleopterans, the study species is here considered to have a narrow food preference, and consequently, is a dietary specialist.

关键词： Ansonia latidisca Borneo diet ecology malaysia Sarawak

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Friction-based riveting technique for AZ31 magnesium alloy

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Journal of magnesium and Alloys 2022年第1期10卷 122-130页

作者： Tianhao Wang Scott Whalen Xiaolong ma Joshua Silverstein Hrishikesh das madhusudhan R.Pallaka Angel Ortiz Timothy Roosendaal Piyush Upadhyay keerti S kappagantula Pacific Northwest National Laboratory MSIN:K2-03902 Battelle Blvd.RichlandWA 99352United States

A new friction-based riveting technique, Rotating Hammer Riveting(RHR), is demonstrated to fully form AZ31 Mg rivet heads in a mere 0.23 s. Heat and pressure generated through severe plastic deformation during the process was sufficient to form the Mg rivet head without the need for a pre-heating operation. Due to preliminary twinning and followed by dynamic recrystallization, AZ31 Mg grains in the rivet head were refined during RHR, which enhance the formability of Mg rivets by triggering grain boundary sliding and reducing plastic anisotropy of Mg. In addition, RHR joints showed a metallurgical bond between the rivet head and top AZ31 Mg sheet, which eliminates a significant pathway for corrosion.

关键词： Rivet magnesium Dissimilar joining

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Monolithic integrated micro-supercapacitors with ultra-high systemic volumetric performance and areal output voltage

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National Science Review 2023年第3期10卷 169-177页

作者： Sen Wang Linmei Li Shuanghao Zheng Pratteek das Xiaoyu Shi Jiaxin ma Yu Liu Yuanyuan Zhu Yao Lu Zhong-Shuai Wu Hui-Ming Cheng State key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Department of Biotechnology Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Chinese Academy of Sciences University of Chinese Academy of Sciences Faculty of materials Science and Engineering Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of Sciences Shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of Sciences Advanced Technology Institute University of Surrey

Monolithic integrated micro-supercapacitors(MIMSCs) with high systemic performance and cell-number density are important for miniaturized electronics to empower the Internet of ***,fabrication of customizable MIMSCs in an extremely small space remains a huge challenge considering key factors such as materials selection,electrolyte confinement,microfabrication and device-performance ***,we develop a universal and large-throughput microfabrication strategy to address all these issues by combining multistep lithographic patterning,spray printing of MXene micro electrodes and controllable 3D printing of gel *** achieve the monolithic integration of electrochemically isolated micro-supercapacitors in close proximity by leveraging high-resolution micropatterning techniques for micro electrode deposition and 3D printing for precise electrolyte ***,the MIMSCs obtained demonstrate a high areal-number density of 28 cells cm-2(340 cells on 3.5 × 3.5 cm2),a record areal output voltage of 75.6 V cm-2,an acceptable systemic volumetric energy density of 9.8 mWh cm-3and an unprecedentedly high capacitance retention of 92% after 4000 cycles at an extremely high output voltage of 162 *** work paves the way for monolithic integrated and microscopic energy-storage assemblies for powering future microele ctronics.

关键词： monolithic integrated micro-supercapacitors areal output voltage lithography MXene

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From mantle Transition Zone with Microstructures: A New Paradigm in Ophiolite Studies

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Acta Geologica Sinica(English Edition) 2020年第S01期94卷 53-54页

作者： Souvik das Department of Earth and Environmental Sciences University of Texas at ArlingtonTX 76019USA

The SE Ladakh(India) area displays one of the best-preserved ophiolite sections in this planet, in places up to 10 km thick, along the southern bank of the Indus River. Recently, in situ ultra-high pressure(UHP) microstructural evidences from mantle transition zone(MTZ ~ 410–660 km) with diamond and reduced fluids were discovered from two peridotite bodies in the basal mantle part of this Indus ophiolite(das et al., 2015;2017). Ultrahigh-pressure phases were also found by early workers from podiform chromitites of another equivalent Neo–Tethyan ophiolite in southern Tibet(e.g., Yang et al., 2007;Yamamoto et al., 2009). However, the MTZ phases in the Indus ophiolite are found in silicate peridotites not metallic chromitites and the peridotitic UHP phases show systematic and contiguous phase transitions from the MTZ to shallower depth, unlike the discrete ultrahighpressure inclusions, all in Tibetan chromitites. The gradual change in oxygen fugacity(fo2) and fluid composition from(C-H + H2) to(CO2 + H2O) in the upwelling peridotitic mantle causing melting to produce MORB. At shallow depths(km) the free water stabilizes into hydrous phases, such as amphiboles and serpentines, capable of storing water and prevent melting(Fig. 1). The results from Indus ophiolite provide unique insights into deep sub-oceanic mantle processes, and link deep mantle upwelling and MORB genesis(Fig. 1). The tectonic setting of Neo-Tethyan ophiolites has been a difficult problem since the birth of plate tectonics concept. This problem for the origin of ophiolites in mid-ocean ridge versus supra subduction-zone settings clearly confused the Geoscience community. However, Indian Ocean –type isotopic characteristics are present in Neo-Tethyan ophiolites(Zhang et al., 2005). Recently, continental materials(quartz, k-feldspar etc.) bearing old zircons(up to 2700 ma) are also recovered from UHP chromitite of Tibetan ophiolite(Yamamoto et al., 2013). Eventually, the presence of older continenta

关键词： mantle transition zone Neo-Tethyan ophiolites diamond oxygen fugacity historical contingency

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