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Measurements and thermodynamic modeling of liquid–liquid equilibria in ternary system 2-methoxy-2-methylpropane+p-cresol+water

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Chinese Journal of Chemical Engineering 2016年第3期24卷 360-364页

作者： liejin Luo Dong liu libo li Yun Chen Key Laboratory of Heat Transfer Enhancement and Energy Conservation of Ministry of Education School of Chemistry and Chemical EngineeringSouth China University of Technology

liquid-liquid equilibrium （LLE） data for the ternary system 2-methoxy-2-methylpropane （methyl tert-butyl ether）＋ p-cresol ＋ water was measured at atmospheric pressure and temperatures of 298.15 K and 313.15 K. From the distribution coefficients and selectivity, it was found that 2-methoxy-2-methylpropane is an efficient solvent to extract p-cresol from wastewater. The consistency of the experimental tie-line data was verified with the Hand and Bachman equations. These data were also correlated with the non-random two liquid （NRTL） and universal quasi-chemical correlation activity coefficient （UN1QUAC） models to yield binary interac- tion parameters for p-cresol extraction process evaluation. Both models agreed with experiments very well, yet the NRTL model showed even smaller average deviation than the UNIQUAC model.

关键词： liquid-liquid equilibriaSolvent extractionWaste treatmentNRTLUNIQUACSimulation

杂合型血液净化对腹膜透析不充分ESRD患者透析充分性、免疫、炎症的影响

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昆明医科大学学报 2024年第8期45卷 125-132页

作者：关毅标黄胜李丽波佛山市南海区人民医院肾内科广东佛山528200

目的探究杂合型血液净化在腹膜透析不充分终末期肾病(ESRD)中的应用及对透析充分性、慢性炎症状态及安全性改善作用。方法选取2020年9月至2022年8月佛山市南海区人民医院腹膜透析不充分ESRD患者80例,随机分为2组,每组40例,对照组采取... 详细信息

目的探究杂合型血液净化在腹膜透析不充分终末期肾病(ESRD)中的应用及对透析充分性、慢性炎症状态及安全性改善作用。方法选取2020年9月至2022年8月佛山市南海区人民医院腹膜透析不充分ESRD患者80例,随机分为2组,每组40例,对照组采取单纯血液透析,观察组采取杂合型血液净化,连续治疗3个月。比较2组一般资料、治疗前后血清指标[全段甲状旁腺激素(iPTH)、β2-微球蛋白(β2-MG)、胱抑素C(CysC)]、肾功能指标[尿素氮(BUN)、血肌酐(Scr)、残存肾功能(RRF)]、营养状况[血红蛋白(Hb)、白蛋白(Alb)、转铁蛋白(TRF)]、慢性炎症状态[白细胞介素-6(IL-6)、超敏C反应蛋白(hs-CRP)、肿瘤坏死因子-α(TNF-α)]、红细胞免疫功能[红细胞免疫复合物花环率(RBC-ICR)、红细胞C3b受体(RBCC3bR)、CD35阳性红细胞百分率]及尿素清除指数(KT/V)、并发症情况。结果治疗1、3个月后观察组iPTH、β2-MG、CysC水平均低于对照组,KT/V高于对照组(P 0.05)。结论杂合型血液净化运用弥散、对流及吸附原理能最大限度地清除炎症介质,提高透析充分性和红细胞免疫粘附活性,改善机体营养状态和肾功能,应用于透析不充分ESRD患者效果显著。

关键词：杂合型血液净化透析充分性终末期肾病慢性炎症安全性

Molecular dynamics simulation on DNA translocating through MoS_(2) nanopores with various structures

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 922-934页

作者： Daohui Zhao Huang Chen Yuqing Wang Bei li Chongxiong Duan Zhixian li libo li School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China School of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528231China

The emergence of MoS_(2) nanopores has provided a new avenue for high performance DNA sequencing,which is critical for modem chemical/biological research and ***,molecular dynamics simulations were performed to design a conceptual device to sequence DNA with MoS_(2) nanopores of different structures(e.g.,pore rim contained Mo atoms only,S atoms only,or both Mo and S atoms),where various unfolded single-stranded DNAs(ssDNAs)translocated through the nanopores driven by transmembrane bias;the sequence content was identified by the associating ionic *** ssDNAs adsorbed onto the MoS_(2) surface and translocated through the nanopores by transmembrane electric field in a stepwise manner,where the pause between two permeation events was long enough for the DNA fragments in the nanopore to produce well-defined ionic blockage current to deduce the DNA’s base *** transmembrane bias and DNA-MoS_(2) interaction could regulate the speed of the translocation ***,the structure(atom constitution of the nanopore rim)of the nanopore considerably regulated both the translocate process and the ionic ***,MoS_(2) nanopores could be employed to sequence DNA with the flexibility to regulate the translocation process and ionic current to yield the optimal sequencing performance.

关键词： DNA sequencing MoS_(2) molecular dynamics simulation nanopore ionic current

Round-the-clock water harvesting from dry air using a metal-organic framework

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Chinese Journal of Chemical Engineering 2022年第9期35卷 170-177页

作者： Jianhui li Yi Wang Yang Chen Qizhao Xiong Jiangfeng Yang libo li Jinping li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China

Harvesting water from the atmosphere is an important process to solve the extreme lack of water resources in arid regions. Adsorption-based atmospheric water harvesting(AWH) takes advantage of solar thermal energy to harvest water from air. This technique is particularly suitable for arid regions characterized by low humidity and an abundance of sunshine. Nonetheless, under low humidity conditions, AWH is highly dependent on water-adsorbing materials exhibiting excellent performance. In this work, a metal–organic framework(MOF), namely [Zn_(2)(bpy)(btec)(H_(2)O)_(2)]·2H_(2)O, also denoted as MWH-1, was investigated for application in water harvesting under low humidity conditions(lity. At temperatures of 293–333 K and low pressure, activated MWH-1a exhibited competitive water uptake(relative humidity(RH) = 5%,uptake>200 cm^(3)·cm^(-3);RH = 10%, uptake >250 cm^(3)·cm^(-3)). This ensured effective water harvesting at high temperatures during the day. In situ powder X-ray diffraction and Fourier-transform infrared analyses confirmed the sensitive water adsorption process of MWH-1a. The X-ray single-crystal study further demonstrated that single-crystal structures could be completely restored following water ***-1 showed good structural stability and enabled water harvesting under low humidity and high temperature conditions. Thus, it has the potential for application in round-the-clock water harvesting in extremely arid regions.

关键词： MOFs Atmospheric water harvesting Extremely low humidity Single-crystal restoration Round-the-clock

Measurement and correlation of phase equilibrium data of the mixtures consisting of water, resorcinol, mesityl oxide at different temperatures

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2573-2580页

作者： Youchang Wang Shaoming Zhou Jinhui Tang Yun Chen libo li Key Laboratory of Heat Transfer Enhancement and Energy Conservation of Ministry of Education School of Chemistry and Chemical Engineering South China University of Technology

liquid–liquid equilibrium(LLE) data were measured for the ternary system of water + resorcinol + mesityl oxide under atmospheric pressure at temperatures of(298.2, 323.2, 333.2, 343.2 and 353.2) K. The reliability of the experimental data was verified by the Hand and Bachman equations. The distribution coefficient and selectivity were calculated from the experimental LLE data, which showed high efficiency of mesityl oxide extracting resorcinol from the aqueous solution. The NRTL and UNIQUAC models were employed to fit the measured experimental LLE data and yield corresponding binary interaction parameters.

关键词： liquid-liquid equilibrium Mesityl oxide Resorcinol NRTL UNIQUAC

Dual-modal Colorimetric and Fluorometric Method for Glucose Detection Using MnO2 Sheets and Carbon Quantum Dots

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Chemical Research in Chinese Universities 2019年第5期35卷 767-774页

作者： WANG Chengke TAN Rong li libo liU Dong College of Food and Biological Engineering Jiangsu UniversityZhenjiang 212013P.R.China Henan Key Laboratory of Bioniolecular Recognition and Sensing Shangqiu Normal UniversityShangqiu 476000P.R.China School of Agricultural Equipment Engineering Institute of Agricultural EngineeringJiangsu UniversityZhenjiang 212013P.R.China

A novel dual-modal fluorometric and colorimetric method was developed for glucose detection using MnO2 sheets and carbon quantum dots(CQDs). The glucose could be oxidized by glucose oxidase, in accompanied witli the fbnnation of H2O2 intennediate, which resulted in the decomposition of MnO2 sheets, as well as tlie MnO2 sheets(brown) changed to Mn^2+ ions(colorless), which induced the absorption of MnO2 sheet decreased and the fluorescence of CQDs increased, consequently. The linear detection ranges of glucose are 5-1000 μmol/L by fluorescent method and 5-60 μmol/L by colorimetric method. The limits of detection of these two measurements are 2.11 and 2.18 μmol/L, respectively. This method is easy to conduct, has reasonable sensitive and selectivity, and could be applied for the glucose detection in real human senim.

关键词： MnO2 Carbon quantum dot Colorimetric Fluorescent Dual-modal

Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

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Chinese Journal of Chemical Engineering 2021年第9期34卷 217-221页

作者： Chaohui He Rajamani Krishna Yang Chen Jiangfeng Yang Jinping li libo li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Van’t Hoff Institute for Molecular Sciences University of AmsterdamScience Park 9041098 XH Amsterdamthe Netherlands Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyTaiyuan 030024China

The removal of trace propyne(C_(3)H_(4))from propyne/propylene(C_(3)H_(4)/C_(3)H_(6))mixtures is a technical and challenging task during the production of polymer-grade propylene in view of their very similar size and physical *** some progress has been made,it is still very challenging to use some highly stable and commercially available porous materials via an energy-efficient adsorptive separation ***,we report the ultrafine tuning of the pore apertures in type-A zeolites for the highly efficient removal of trace amounts of C_(3)H_(4)from C_(3)H_(4)/C_(3)H_(6)*** resulting ion-exchanged zeolite 5 A exhibits a large C_(3)H_(4)adsorption capacity(2.3 mmol g^(-1)under 10^(-4)MPa)and high C_(3)H_(4)/C_(3)H_(6)selectivity at room temperature,which were mainly attributed to the ultrafine-tuned pore size that selectively blocks C_(3)H_(6)molecules,while maintaining the stro ng adsorption of C_(3)H_(4)at low pressure *** purity of C_(3)H_(6)(>99.9999%)can be directly obtained on this material under ambient conditions,as demonstrated by the experimental breakthrough curves obtained for both 1/99 and 0.1/99.9(V V)C_(3)H_(4)/C_(3)H_(6) mixtures.

关键词： Type-A zeolite Ion-exchange Pore tuning Propyne/propylene separation Breakthrough experiments

Stable titanium metal-organic framework with strong binding affinity for ethaneremoval

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Chinese Journal of Chemical Engineering 2022年第2期35卷 35-41页

作者： Puxu liu Yong Wang Yang Chen Xiaoqing Wang Jiangfeng Yang libo li Jinping li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyTaiyuan 030024China

Direct separation of high purity ethylene(C_(2)H_(4))from an ethane(C_(2)H_(6))/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two *** some studies have attempted this separation,there is a lack of excellent porous materials with strong binding affinity for C_(2)H_(6)-selective adsorption via an energy-efficient adsorptive separation ***,we report a titanium metal-organic framework with strong binding affinity and excellent stability for the highly efficient removal of C_(2)H_(6) from C_(2)H_(6)/C_(2)H_(4) *** component adsorption isotherms demonstrated a larger amount of adsorbed ethane(1.16 mmol·g^(-1) under 1 kPa)and high C_(2)H_(6)/C_(2)H_(4) selectivity(2.7)for equimolar C_(2)H_(6)/C_(2)H_(4) mixtures,especially in the low-pressure range,which is further confirmed by the results of grand canonical Monte Carlo simulations for C_(2)H_(6) adsorption in this *** experimental breakthrough curves showed that C_(2)H_(4) with a high purity was collected directly from both 1:9 and 1:15 C_(2)H_(6)/C_(2)H_(4)(volume ratio)mixtures at 298 K and 100 ***,the unchanged adsorption and separation performance after cycling experiments confirmed the promising applicability of this material in future.

关键词： Titanium metal-organic framework Adsorption Separation Ethylene purification Strong binding affinity Molecular simulation

Notes in accordions-organized MXene equipped with CeO_(2) for synergistically adsorbing and catalyzing polysulfides for high-performance lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第7期31卷 502-510,I0013页

作者： Xiaochuan Chen libo li Yuhang Shan Da Zhou Wenjun Cui Yangmingyue Zhao School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040HeilongjiangChina

limited by the shuttle effect, the application of lithium-sulfur batteries is not impressive. As an organ layered two-dimensional(2D) material, MXene has a great electrical conductivity and high specific surface area. Meanwhile, the introduction of metal oxides can restrain the shuttle effect. Hence, this paper prepared CeO_(2)/MXene as a cathode material of li-S batteries. Ce and Ti can chemically adsorb S, and the interlayer structure of MXene can limit S while the interlayer space can alleviate volume *** discharge capacity at 0.5 C is as high as 1051.1 m Ah g^(-1), and 921.9 m Ah g^(-1) after 200 cycles. The average coulombic efficiency is 97.75%. The organized MXene with CeO_(2) like notes in accordions are new efficient materials for lithium-sulfur batteries.

关键词： Cooperative effects MXene CeO_(2) Kinetics lithium-sulfur batteries