查找使用阿拉丁产品的科研文献

Circularly Polarized Light Detection by Chiral Photonic Cellulose Nanocrystal with ZnO Photoconductive Layer in Ultraviolet Region

Boyu Zhang,Sixiang Zhao,Yingying Yu,Ming Li,Liancheng Zhao,Liming Gao

Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6A and 1.77 × 10−6A respectively and the anisotropy factor Δgpcof 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.Keywords:circularly polarization light detection;cellulose nanocrystal;ZnO photoconduction

Experimental study of the mass transfer behavior of carbon dioxide absorption into ternary phase change solution in a packed tower

Yihan Yin,Aoqian Qiu,Hongxia Gao,Yanqing Na,Zhiwu Liang

Phase change absorbents for CO 2 are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process. Compared with other phase change absorbents, monoethanolamine (MEA)-sulfolane-water is inexpensive and has a fast absorption rate. It is one of the most promising solvents for large-scale industrial applications. Therefore, this study investigates the mass transfer performance of this phase change system in the process of CO 2 absorption in a packed tower. By comparing the phase change absorbent and the ordinary absorbent, it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration. In the 4 mol⋅L −1 MEA/5 mol⋅L −1 sulfolane system, the CO 2 loading of the upper liquid phase after phase separation is almost zero, while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent, which greatly reduces the energy consumption. This study also investigates the influence of operating parameters such as lean CO 2  loading, gas and liquid flow rates, CO 2  partial pressure, and temperature on the volumetric mass transfer coefficient ( K G a V ). The research shows that  K G a V  increases with increasing liquid flow rate and decreases with the increase of lean CO 2  loading and CO 2  partial pressure, while the inert gas flow rate and temperature have little effect on  K G a V . In addition, based on the principle of phase change absorption, a predictive equation for the  K G a V  of MEA-sulfolane in the packed tower was established. The  K G a V  obtained from the experiment is consistent with the model prediction, and the absolute average deviation (AAD) is 7.8%.

Multifunctional Two-Terminal Optoelectronic Synapse Based on Zinc Oxide/Poly(3-hexylthiophene) Heterojunction for Neuromorphic Computing

Pengfei Zhao,Rongxue Ji,Jie Lao,Chunli Jiang,Bobo Tian,Chunhua Luo,Hechun Lin,Hui Peng,Chun-Gang Duan

With the advantages of wide bandwidth, low power consumption, high propagation speed, and excellent interconnectivity, the light-tunable synapse is regarded as one of the most promising candidates to pave the way for constructing neuromorphic computing and overcoming the von Neumann bottleneck. Herein, an optoelectronic synaptic memristor based on zinc oxide/poly(3-hexylthiophene) (ZnO/P3HT) heterojunction is fabricated via a simple two-step spin coating process. The prepared device can simulate typical neuromorphic manners, such as excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), the transformation from short-term plasticity (STP) to long-term plasticity (LTP), and “learning-experience” behavior by modulating the applied light pulses. In addition to the optoelectronic synaptic behaviors, our device incorporates light logic functions (“AND” and “OR” operations) and optical information detection and memory functions analogous to those in the human’s visual recognition memory system.

Combined experimental and computational study on the promising monoethanolamine + 2-(ethylamino)ethanol + sulfolane biphasic aqueous solution for CO2 absorption

Qinlan Luo,Bohak Yoon,Hongxia Gao,Juan Lv,Gyeong S. Hwang,Min Xiao,Zhiwu Liang

To reduce the regeneration energy consumption for CO 2 capture, an advanced monoethanolamine (MEA) + 2-(ethylamino)ethanol (EAE) + sulfolane biphasic aqueous solution was developed, and the phase separation mechanism was explored. The effects of the concentration ratio on the phase separation behavior, CO 2 absorption performance, CO 2 loading at the phase separation point, and CO 2 desorption performance of MEA + EAE + sulfolane solutions were investigated comprehensively in experiments. The 3 M MEA + 2 M EAE + 5 M sulfolane showed the best properties with a large CO 2 loading of 0.32 mol/mol at the phase separation point and the relative low regeneration energy consumption, which is comparable to 5 M MEA in absorption with an improved desorption performance. The molecular mechanism of phase separation was revealed by molecular dynamics simulations, illustrating that strong hydrogen bonding between amine products and water and enhanced intermolecular interaction among amine products, would promote an aggregation of amine products. This study provides a promising candidate for energy-efficient CO 2 capture with molecular insights into a liquid–liquid phase separation.

Kinetics of CO2 absorption into ethanolamine + water + ethanol system—mechanism, role of water, and kinetic model

Qinlan Luo,Qiang Sun,Qi Liu,Sen Liu,Min Xiao,Mengjie Chen,Yuanyuan Li,Hongxia Gao,Zhiwu Liang

The kinetics of CO 2 absorption in ethanolamine (MEA) + H 2 O + ethanol systems was investigated using stopped-flow apparatus. The first-order reaction rate constant ( k 0 ) values were tested with varying H 2 O and MEA concentrations. Transiting from the aqueous to non-aqueous solvents, the k 0 decreases and the reaction order for MEA shifts from 1.05 to 1.88. The zwitterion mechanism with the rate-limiting step of deprotonation was used to explore the role of water and its effect. Results showed that water could impact reactions through direct involvement and changing solvation environment. An improved kinetic model based on the zwitterion mechanism was obtained to indicate the quantitative influence of H 2 O concentration on the reaction kinetics of MEA + H 2 O + ethanol systems. The predicted values from the model well agreed to the experimental data with the average absolute relative difference of 6.73%. This study highlights the important effects of water on the reaction kinetics of CO 2 absorption into water-lean amine solutions.

Efficient nickel-based catalysts for amine regeneration of CO2 capture: From experimental to calculations verifications

Qiang Sun,Hongxia Gao,Yu Mao,Teerawat Sema,Sen Liu,Zhiwu Liang

High heat duty is an urgent challenge for industrial applications of amine-based CO 2 capture. The temperature (>110°C) of carbamate breakdown in amine regeneration requires large energy consumption. In this work, we report a novel, stable, efficient, and inexpensive Ni-HZSM-5 catalyst to improve the CO 2 desorption rate and reduce the heat duty. The impregnation method was applied for varying nickel content in the catalysts from 2.16 to 9.80 wt% in HZSM-5. The catalysts were characterized by scanning electron microscope, X-ray powder diffraction, N 2 adsorption–desorption, inductively coupled plasma-optical emission spectrometry, ultraviolet-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, NH 3 -temperature programmed desorption (TPD), Infrared spectroscopy of pyridine adsorption, and Fourier transform infrared spectroscopy. The catalytic performance was evaluated by CO 2 desorption of rich amine solvent at 90°C. It was found that the introduction of nickel increased the acid sites of catalysts compared with parent HZSM-5. This phenomenon plays a key role on improving the CO 2 desorption rate. The density functional theory (DFT) calculations successfully explain the catalytic performance. The catalytic activity associates with the combined properties of MSA × B/L × Ni 2+ . The 7.85-Ni-HZ catalyst presents an excellent catalytic activity for the CO 2 desorption: it increases the amount of desorbed CO 2 up to 36%, reduces the relative heat duty by 27.07% with the same reaction time, and possesses high stability during five cyclic tests. A possible catalytic mechanism for the Ni-HZSM-5 catalysts through assisting carbamate breakdown and promoting CO 2 desorption is proposed based on experimental results and theoretical calculations. Therefore, the results present that the 7.85-Ni-HZ catalyst significantly accelerates the protons transfer in CO 2 desorption and can potentially apply in industrial CO 2 capture.

CO2 absorption and microwave regeneration with high-concentration TETA nonaqueous absorbents

Jinxiu Li,Yu Li,Chen Li,Rui Tu,Pengfei Xie,Yi He,Yao Shi

While nonaqueous organic-amine absorbents have great potential in reducing energy consumption of CO 2 capture, their absorption/desorption behaviors are still poorly understood when high-concentration polyamines are used. On the other hand, large scale CO 2 capture demands the use of high-concentration polyamines absorbents. Therefore, we investigated the absorption and microwave regeneration behavior of high-concentration triethylenetetramine (TETA) in three typical organic solvents, including polyethylene glycol 200 (PEG200), diethylene glycol (DEG), and ethylene glycol (EG). The results showed that high-concentration TETA nonaqueous absorbents demonstrate advantages in absorption rate and regeneration energy consumption. The average absorption rate of 2.0 and 5.0 mol/L TETA/EG was 2.84 and 4.70 times that of 0.6 mol/L, respectively. The energy consumption of TETA/EG and TETA/DEG decreased by 29.4 and 25.6% as the concentration increased from 0.6 to 5.0 mol/L. In addition, the high-concentration TETA/PEG200 absorbent demonstrated observable tolerance for water vapor, which usually exists in flue gas. Results also showed that microwave regeneration was superior to conventional conduction heating especially when high-concentration TETA/PEG200 absorbent were used. The energy consumption of microwave regeneration of the absorbent with a concentration of 0.6, 2.0, and 5.0 mol/L was reduced by 65.9, 81.2, and 86.0%, respectively when compared with conduction heating. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

Optical Fiber SPR Sensor With Surface Ion Imprinting for Highly Sensitive and Highly Selective Ni2+ Detection

Yao Ma,Wanlu Zheng,Ya-Nan Zhang,Xuegang Li,Yong Zhao

A Novel Dual-Stage Phase Separation Process for CO2 Absorption into a Biphasic Solvent with Low Energy Penalty

Xiaowei Zhou,Yao Shen,Fan Liu,Jiexu Ye,Xinya Wang,Jingkai Zhao,Shihan Zhang,Lidong Wang,Sujing Li,Jianmeng Chen

An amine-based biphasic solvent is promising to cut down the energy penalty of CO2 capture. However, the high viscosity of the CO2-enriched solvent retards its industrial application. This work proposed a novel dual-stage phase separation process using a triethylenetetramine and 2-(diethylamino)ethanol blend as a biphasic solvent, which separates a certain proportion of CO2-enriched phase during CO2 absorption to reduce its viscosity. Experimental results showed that the proposed dual-stage phase separation process improved the phase separation behavior and effectively enhanced the absorption rate by 49% at 50 °C, when 50 vol % CO2-enriched phase was separated at 0.3 mol mol–1. Kinetic analysis showed that the absorption rate was mainly controlled by liquid-side mass transfer. The regeneration heat of the dual-stage phase separation process cut down the energy penalty by 33% compared with the monoethanolamine-based process. Compared with the conventional biphasic solvent-based process, the heat duty was further declined by 8%. The 1H nuclear magnetic resonance analysis showed that the dual-stage phase separation process could effectively control the generation of absorption products and intensify the interphase migration of tertiary amines.

Energy-efficient carbon dioxide capture using a novel low-viscous secondary amine-based nonaqueous biphasic solvent: Performance, mechanism, and thermodynamics

Xiaobin Zhou,Chao Liu,Yinming Fan,Lihao Zhang,Shen Tang,Shengpeng Mo,Yinian Zhu,Zongqiang Zhu

Biphasic solvents have been widely studied for CO 2 capture due to their remarkable energy-saving potentiality. However, most existing biphasic solvents suffer from the high viscosity of their CO 2 -rich phase. This study proposed a novel low-viscous secondary amine-based nonaqueous biphasic solvent for CO 2 capture. With dimethyl sulfoxide (DMSO) as the organic diluent and pentamethyldiethylenetriamine (PMDETA) as the phase splitting agent, the secondary amine of 2-methyl-ethynolamine (MAE) was proved to be the optimal candidate for preparing the biphasic solvent. The MAE/DMSO/PMDETA (M/D/P) biphasic solvent could realize a high CO 2 loading of 0.84 mol mol −1 and the viscosity of its CO 2 -rich phase was only 8.87 mPa s, which was significantly lower than that of most reported biphasic solvents. The reaction mechanism analysis revealed that M/D/P absorbed CO 2 to form products of protonated amines, carbamate, and carbamic acid species. Since the products were polar and showed a stronger affinity to polar DMSO, while less polar PMDETA was isolated, thereby resulting in a phase change. Thermodynamics analysis showed that the M/D/P biphasic solvent could sharply cut down the sensible heat and latent heat during CO 2 desorption. Eventually, the total regeneration energy penalty of M/D/P was significantly reduced by 46.3% compared with the benchmark aqueous MEA solution.

A novel conductive rGO/ZnO/PSF membrane with superior water flux for electrocatalytic degradation of organic pollutants

Ning Li,Wenyi Wang,Chao Ma,Liuyong Zhu,Xingyu Chen,Bingjie Zhang,Chongli Zhong

Ultrafiltration membranes have shown remarkable potential in the purification of textile printing and dyeing wastewater. However, ultrafiltration membranes have some disadvantages in wastewater treatment , such as membrane fouling and trade-off effect. Hence, a novel polysulfone (PSF)-reduced graphene oxide (rGO)-zinc oxide (ZnO) composite conductive ultrafiltration membrane was prepared via the simple and green method. The combination of conductive ultrafiltration membrane and external electric field could treat dye wastewater. The conductive rGO/ZnO/PSF membranes have high water flux (296 L m −2  h −1 Bar −1 ) and favorable removal rates (>90%) for Congo Red (CR), Methyl Orange (MO), and Methylene Blue (MB). Besides, rGO/ZnO/PSF membrane also showed excellent antifouling ability, which had a flux recovery rate of 93% after filtration of bovine serum albumin (BSA) under applied electric field. Due to the electrocatalytic cleaning, rGO/ZnO/PSF membrane exhibited a 90% flux recovery after filtering the dye. The rGO/ZnO/PSF membrane has good separation efficiency, electrocatalytic stability, and fouling resistance, and can effectively solve the purification of textile printing and dyeing.

Portable colorimetric photonic indicator for ethanol concentration sensing

Yong Qi,Donghui Kou,Yudong Sun,Tong Hu,Hang Yuan,Changtong Zhou,Chang Li,An-Hui Lu,Suli Wu,Shufen Zhang

Colorimetric sensing of ethanol concentration accelerates the intellectualization of the ethanol industry. The development of alcohol detectors with excellent structural color output and reconfigurable nanostructures will certainly set off reform in colorimeter sensors. Here, a novel portable colorimetric photonic indicator (CPI) that can distinguish alcohol with concentrations from 0 to 100 % was ingeniously fabricated by bridging the copolymer capable of autonomic solvent control with porous structure via shape memory photonic crystals (PCs). CPI shows an ultrafast color response (<1 s) to the perception of ethanol concentration and outputs structural colors from blue to red, with reflection covering ∼477 to ∼628 nm. The coloration and color-change mechanisms of CPI are derived from the hydrogen bonds remodeling among carboxyls, ethylene glycol groups, and solvent molecules, the shape memory effect of the inverse opal skeleton, and the reversible structural transformation induced by the solvent co-solvency effect. We validate the real-time visual concentration-detection capabilities of CPI by measuring the distillate concentration during the alcohol distillation. We envisage that CPIs show potential applications in automated and broad-spectrum molecule-detection devices in biomedical and chemical engineering.