LUMINESCENCE
·
2013
·Vol. 29
·期 2
·151-157
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IF 1.273
Wei Bian,Jing Ma,Qiaoling Liu,Yanli Wei,Yingfu Li,Chuan Dong,Shaomin Shuang
N -acetyl- l -cysteine-capped Mn-doped ZnS quantum dots (QDs) were prepared by hydrothermal methods. It could emit phosphorescence at 583 nm with the excitation wavelength at 315 nm. The phosphorescence intensity of QDs could be quenched dramatically by increasing the concentration of Co 2+ ion. The novel phosphorescence sensor based on N -acetyl- l -cysteine-capped QDs was developed for detecting Co 2+ ion with a linear dynamic range of 1.25 × 10 –6 –3.25 × 10 –5 m . The limit of detection and RSD were 6.0 × 10 –8 m and 2.3%, respectively. Interference experiments showed excellent selectivity over numerous cations such as alkali, alkaline earth and transitional metal ions. The possible quenching mechanism was also examined by phosphorescence decays. The proposed phosphorescence method was further applied to the trace determination of Co 2+ ion in tap and pond water samples with recoveries of 97.75–103.32%. Copyright © 2013 John Wiley & Sons, Ltd.
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JOURNAL OF MEMBRANE SCIENCE
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2014
·
IF 4.908
Zhihua Qiao,Zhi Wang,Shuangjie Yuan,Jixiao Wang,Shichang Wang
Small molecular amines (SMAs) (ethanediamine (EDA), piperazine (PIP), monoethanolamine (MEA) and diethanol amine (DEA)) were separately used to modify the polyvinylamine (PVAm). ATR-FTIR, elemental analyzer, XRD and SEM were employed to characterize the SMA interacted PVAm. The PVAm–SMA/polysulfone (PS) membranes were developed by coating PVAm–SMA mixed solutions on the PS ultrafiltration membrane. CO 2 permeance and CO 2 /H 2 selectivity of the PVAm–SMA/PS membranes were investigated. Among different PVAm–SMA/PS membranes, the PVAm–MEA/PS membrane shows the highest CO 2 /H 2 separation performance. Moreover, the effect of the selective layer thickness on the CO 2 /H 2 separation performance of the PVAm–MEA/PS membrane was studied. With increasing the PVAm–MEA selective layer thickness, the CO 2 /H 2 separation performance of the membrane apparently decreases. Finally, the CO 2 /H 2 separation performance stability of the PVAm–MEA/PS membranes was investigated and no deterioration in the membrane permselectivity was observed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Yiming Zhang,Huixian Wang,Yatao Zhang,Xiaoxu Ding,Jindun Liu
Montmorillonite (MMT) and Mg-Al hydrotalcite (HT) nanosheets were prepared via vigorous agitation and ultrasonic, respectively. In order to increase the permeability of CO 2 , poly (PEA-MMT-TMC)/PS and poly (PEA-HT-TMC)/PS composite membranes were prepared via interfacial polymerization by adding the dimensional (2D) inorganic nanosheets (MMT and HT) into the aqueous phase of PEA. And in consequence, the poly (PEA-MMT-TMC)/PS composite membrane showed CO 2 permeability of 15.87 barrer and the CO 2 /N 2 selectivity of 37 at 1.0 bar when the MMT concentration was 0.068 wt%. The poly (PEA-HT-TMC)/PS composite membrane also showed CO 2 permeability of 15.3 barrer and the CO 2 /N 2 selectivity of 40 at 1.0 bar when the HT concentration was 0.25 wt%. Compared with the controlled membrane (CO 2 permeability: 6.9 barrer, CO 2 /N 2 selectivity: 103), the CO 2 permeability increased after incorporating the inorganic nanosheets into the membranes and maintained the pretty CO 2 /N 2 selectivity. The addition of exfoliated MMT and HT could facilitate the gas permeation to improve the gas separation performance of the composite membranes. Also, the combination of inorganic nanosheets with organic membrane has a great potential application in the gas separation.
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AICHE JOURNAL
·
2017
·Vol. 63
·期 11
·4933-4943
·
IF 2.836
Bin Liu,Xiao Luo,Zhiwu Liang,Wilfred Olson,Helei Liu,Raphael Idem,Paitoon Tontiwachwuthikul
CO 2 absorption into aqueous solutions of two tertiary alkanolamines, namely, MDEA and DMEA with and without carbonic anhydrase (CA) was investigated with the use of the stopped-flow technique at temperatures in the range of 293–313 K, CA concentration varying from 0 to 100 g/m 3 in aqueous MDEA solution with the amine concentration ranging from 0.1 to 0.5 kmol/m 3 , and CA concentration varying from 0 to 40 g/m 3 in aqueous DMEA solution with the amine concentration ranging from 0.05 to 0.25 kmol/m 3 . The results show that the pseudofirst-order reaction rate (k 0, amine ; s −1 ) is significantly enhanced in the presence of CA as compared with that without CA. The enhanced values of the kinetic constant in the presence of CA has been calculated and a new kinetics model for reaction of CO 2 absorption into aqueous tertiary alkanolamine solutions catalyzed by CA has been established and used to make comparisons of experimental and calculated pseudo first-order reaction rate constant (k 0, with CA ) in CO 2 -MDEA-H 2 O and CO 2 -DMEA-H 2 O solutions. The AADs were 15.21 and 15.17%, respectively. The effect of pKa on the CA activities has also been studied by comparison of CA activities in different tertiary amine solutions, namely, TEA, MDEA, DMEA, and DEEA. The pKa trend for amines were: DEEA > DMEA > MDEA > TEA. In contrast, the catalyst enhancement in amines was in the order: TEA> MDEA> DMEA> DEEA. Therefore, it can be seen that the catalyst enhancement in the amines decreased with their increasing pKa values. © 2017 American Institute of Chemical Engineers AIChE J , 2017
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Mineral Processing and Extractive Metallurgy Review
·
2017
·
IF 1.219
Zijian Su,Yuanbo Zhang,Bingbing Liu,Yingming Chen,Guanghui Li,Tao Jiang
A selective reduction volatilization (SRV) process developed by the authors was effective to remove tin from the complex tin-bearing iron concentrates. It is reported that many gangue minerals of quartz, calcite, and fluorite are existent in the concentrates. Our previous studies investigated the effect of quartz and calcite on the removal of tin. In this study, the effect of fluorite (calcium fluoride) was conducted, and pure CaF2 was added into the tin-bearing iron concentrates to investigate how CaF2 affected the tin volatilization behavior under different roasting conditions. The effect of CaF2 on the phase transformation of SnO2 was also determined using SEM-EDS and XRD. The results indicated that SnF2 was much easier to volatilize than SnO under CO-CO2 atmosphere in the presence of CaF2, so the calcium fluoride in the concentrates was beneficial to promote the tin removal during the SRV process.
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Catalysts
·
2024
·Vol. 14
·期 9
·590
·
IF 3.8
Jingwen Zhang,Wentian Zhou,Junying Chen,Yingwei Li
Halide perovskite has shown great potential in photocatalysis owing to its diversity, suitable energy band alignment, rapid charge transfer, and excellent optical properties. However, poor stability, especially under humid conditions, hinders their practical application in photocatalysis. In this work, we report the encapsulation of inorganic–organic hybrid perovskite QDs into MIL-101(Cr) through an in situ growth strategy to prepare a series of MAPbBr3@MIL-101(Cr) (MA = CH3NH3+) composites. The perovskite precursors, i.e., MABr and PbBr2, were successively introduced into the pores of MOF, where the perovskite quantum dots were self-assembled in the confined environment. In photocatalytic CO2reduction, 11%MAPbBr3@MIL-101(Cr) composite displayed the best performance among the composites with a total CO and CH4yield of 875 μmol g−1in 9 h, which was 8 times higher than that of the pure MAPbBr3. Such high gas production efficiency could be maintained for 78 h at least without structural and morphologic decomposition. The remarkable stability and catalytic activity of composites are mainly due to the synergistic effect and improved electron transfer between MAPbBr3and MIL-101(Cr). Moreover, these composites revealed a novel mechanism, showing switched CH4selectivity with the controlling of the perovskite location and contents. Those with perovskites encapsulated in the mesopores of MIL-101(Cr) were more preferential for CO production, while those with perovskites encapsulated in both meso- and micropores could produce CH4dominantly.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Ganghua Zhou,Yun Chen,Gaoran Chen,Hangmin Xu,Weiqin Yin,Bin Wang,Xingwang Zhu,Xin Ning,Paul K. Chu,Xiaozhi Wang,Hui Xu
Metal-organic frameworks (MOFs) with abundant pores are excellent adsorbents for metal ions. However, the subsequent treatment of used MOFs and their reutilization still lack promising solutions. Herein, the surface-restructured Mn-doped Cu 2 O (RM-Cu 2 O) catalyst containing asymmetric Mn−Cu sites is prepared by glucose reduction using the spent Cu-based MOF (HKUST-1) as the precursor. The RM-Cu 2 O catalyst shows good potential in tunable photocatalytic syngas (CO and H 2 ) production in a pure water system. The syngas ratios can be tuned from ∼1:2 to ∼1:1 by increasing CO production. DFT calculations and photoelectrochemical tests confirm that the asymmetric Mn−Cu sites on the RM-Cu 2 O catalyst accelerate the photogenerated charge transport and optimize CO 2 adsorption and activation. In situ irradiation X-ray photoelectron spectroscopy is conducted to investigate the dynamic charge transport and reactions on the RM-Cu 2 O catalyst. Based on in situ Fourier transform infrared spectroscopy and simulations, the mechanism of photocatalytic syngas production is elucidated. This work provides a promising solution for the resource utilization of the spent MOFs-based adsorbents and photocatalytic energy development.
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ACS Sustainable Chemistry & Engineering
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2024
·
IF 7.1
Fan Sun,Xueli Xing,Chunyang Zhang,Jinrui Zhang,Hui Hong
Photocatalytic CO2 reduction with naturally abundant H2O as the proton source has attracted widespread concern for its environmental and sustainable advantages. Nevertheless, the high recombination rate of photogenerated electron–hole pairs leads to unsatisfactory solar-to-chemical energy conversion efficiency. In this work, we proposed and validated a strategy that photothermal–magnetic synergistically promotes the separation of photogenerated carriers, as well as their transport, leading to boosted photocatalytic performance. A paramagnetic Z-scheme ZnFe2O4/TiO2 heterojunction was fabricated, and its performance in CO2 reduction was examined under concentrated full-spectrum light illumination with an applied external magnetic field. The built-in electric field of the Z-scheme heterojunction improved the dynamic properties of electron–hole pairs. At the same time, the thermal effect induced by infrared light played a crucial role in promoting CO2 conversion. Importantly, the applied external magnetic field further suppressed the recombination of charge carriers via Lorentz force, magnetoresistance, and spin-polarization effects. As a result, the assistance of a magnetic field significantly increased the yields of CO, CH4, and H2 in comparison to the absence of a magnetic field, with maximum enhancements of 25.3, 29.6, and 62.9%, respectively. Moreover, the excessive heating due to the higher concentrated ratio may induce magnetic disorder within the material, potentially reducing the magnetic field’s ability to facilitate carrier transport. The photothermal–magnetic synergy mechanism was systematically explored. Our work has presented a new approach in which photothermal–magnetic effects synergistically contribute to solar fuel production.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yihan Yin,Qi Liu,Min Xiao,Hongxia Gao,Bo Jin,Zhiwu Liang
Membrane absorption has garnered significant attention due to its ability to combine the advantages of membrane separation and chemical absorption methods. During the scale-up of membrane absorption equipment, the fluid flow and mass transfer processes tend to have serious non-ideal effects, arising from the increase in aspect ratio and the number of membrane fibers. However, traditional one-dimensional (1D) and two-dimensional (2D) models are unable to describe the impact of geometry on mass transfer performance. In this study, a three-dimensional (3D) steady-state model is established to simulate the mass transfer process in a multi-fiber membrane contactor using COMSOL Multiphysics software. The 3D steady-state model is proven to be able to accurately predict the CO 2 absorption flux (J CO2 ) under various operating conditions by comparing the simulation results with experimental data. The results indicate a strong correlation between mass transfer performance and fluid velocity distribution. To further explore the flow behavior of gas and liquid at different locations, a 3D dynamic simulation model is developed and compared with experimental data. This model can describe the non-ideal flow behavior and the characteristics of gas and liquid phases in reactors with complex geometries. The results of the 3D dynamic model show that there are priority and slow regions for fluid flow, and CO 2 mass transfer performance can be enhanced by concentrating the membrane fiber arrangement in the priority region. The model developed in this study can be used to evaluate defects in fluid flow patterns, such as channeling, back mixing, and tailing. Furthermore, the 3D steady-state and dynamic models can guide the design of membrane contactors, optimize operating conditions, and provide a reference for analyzing fluid flow morphology and structural optimization in membrane contactors.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Jinbo Song,Ting Qu,Jinpeng Zhang,Yanxin Jia,Jieying Jing,Wen-Ying Li
CaCO 3 -MgO sorbents were prepared through mechanochemical methods to overcome the poor stability of MgO sorbents caused by sintering and agglomeration. The alkali metal salt-promoted MgCa5 (AMS-MgCa5) sorbent, with 5 wt% CaCO 3 doping, demonstrated the highest cycling stability, with an initial CO 2 capture capacity of 13.9 mmol/g, which stabilized at 9 mmol/g after 10 cycles, and the CO 2 capture ratio reached 77 %. The superior cycling stability of the sorbents was attributed to the existence of CaMg(CO 3 ) 2 , which enhanced the capture rate during the CO 2 chemisorption process. Additionally, the doped CaCO 3 served as an inert support, enhancing CO 2 diffusion and mass transfer, ensuring the uniform coverage of alkali metal salt on the MgO surface, and inhibiting the growth of MgO particles.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zhibin Zhang,Lei Wang,Xixian Yang,Mengyuan Chu,Liyun Huang,Jiayi Fan,Wucheng Xie,Defei Liu,Wenbing Yuan,Yue Situ
The electroreduction of CO2 to formate is of significant interest due to its potential for sustainable fuel and chemical production. Hollow fiber electrodes, which integrate gas diffusion and catalytic layers, offer structural advantages. These advantages enhance gas–solid–liquid-phase reactions, making them particularly beneficial for CO2 electroreduction. This work reports a copper–bismuth alloy hollow fiber with a nanostructured surface, designed with specific metal ratios and transformed into a sulfur surface-modified copper–bismuth alloy hollow fiber (Cu7S4–CuBi HF) electrode with nanoflower structures. CO2-penetration mode enhances formate current density and Faradaic Efficiency (FE) while suppressing the hydrogen evolution reaction (HER), due to the fiber’s unique gas transport. The nanoflower morphology increases the electrochemical active surface area, boosting current densities. This design achieved a formate FE of 91.27% at −0.9 V vs RHE and a current density of 80.12 mA cm–2, outperforming many existing Cu@Bi electrocatalysts. This success is due to the innovative surface design and the distinct structural features of the hollow fiber electrodes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hangyu Li,Yang Gu,Xiaoyuan Zeng,Kai Ding,Haotian Tan,Peng Dong,Yanjia Zhang,Jie Xiao
Due to the high theoretical energy density, lithium-carbon dioxide (Li-CO 2 ) batteries provide unique advantages when using CO 2 to generate electricity. However, the issues with lithium dendrite generated by uneven deposition and quick cathode passivation continue to impede the development of Li-CO 2 batteries. In this work, a Janus separator with dual functionalities is created using an in-situ growth and hydrothermal technique. It can be used to expand the cathode to alleviate the quick passivation of the cathode, in addition to inhibiting the growth of lithium dendrite. On the one hand, as an ion transport framework, Prussian blue (PB) nanocubes formed in-situ on the anode side can control the uniform transport of Li-ions and prevent the proliferation of lithium dendrites. The Prussian blue and reduced graphene oxide composite material (PB-rGO) on the cathode side, on the other hand, can be employed as an extension of the cathode, which not only contains more discharge products but also encourages their decomposition, playing a self-cleaning role. Moreover, the Li||Li symmetrical battery with Janus separator exhibits a steady cycle life of more than 1700 h. Also, when applied to a Li-CO 2 battery, it demonstrates an extremely high discharge capacity of 12100 mAh g −1 and an exceptionally long cycle life of 3144 h.
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