查找使用阿拉丁产品的科研文献

Amine-functionalized MOFs@GO as filler in mixed matrix membrane for selective CO2 separation

Mingmin Jia,Yi Feng,Jianhao Qiu,Xiong-Fei Zhang,Jianfeng Yao

UiO-66-NH 2 @GO nanoparticles were synthesized by growing UiO-66-NH 2 on graphene oxide (GO) nanosheets. The obtained nanoparticles were incorporated in polyimide (PI) matrix to improve the CO 2 separation performance. The crystalline structure, interaction between UiO-66-NH 2 and GO and the dispersion of UiO-66-NH 2 @GO were characterized by various techniques. Owning to the interaction between UiO-66-NH 2 and GO, UiO-66-NH 2 nanocrystals were well-anchored on GO sheets and the size was tailored. Also, it can be found that the high-aspect GO nanosheets in polymer matrix improved the dispersion of UiO-66-NH 2 nanoparticles. The high porosity of UiO-66-NH 2 @GO and inherent adsorption property to CO 2 significantly enhanced the gas separation performance of composite membranes compared to pristine PI membrane. The developed UN@GO-PI mixed matrix membrane with 5 wt% of UiO-66-NH 2 @GO loading showed excellent and stable CO 2 /N 2 separation performance with the CO 2 permeability of 7.28 Barrer and the CO 2 /N 2 selectivity of 52.

Fabrication of porous graphene electrodes via CO2 activation for the enhancement of capacitive deionization

Yi Zhang,Ling Chen,Shudi Mao,Zhuo Sun,Yenan Song,Ran Zhao

Capacitive deionization (CDI) is a simple, cost-efficient and environmentally-friendly method for brackish water desalination . In order to improve the desalination performance, the inner structures of the porous electrodes should provide more space for ion storage and transportation. Therefore, we utilized an efficient method to synthesize porous graphene electrodes based on the technique of pressurized oxidation and CO 2 activation. The prepared electrodes were characterized electrochemically by cyclic voltammetry , galvanostatic charge/discharge and electrochemical impedance spectroscopy , and the desalination performance between different samples was compared as well. These results showed that AGE-30 had the highest electrosorption capacity (6.26 mg/g) among all samples, and this was attributed to its high specific surface area (898 m 2 /g), high pore volume (1.223 cm 3 /g), high specific capacitance (56.21F/g), and smaller inner resistance. Thus, the CO 2 activation is confirmed to be a useful method for the enhancement of the graphene electrodes for CDI.

Designing amino-based ionic liquids for improved carbon capture: One amine binds two CO2

Xiao Y. Luo,Xiao Y. Lv,Gui L. Shi,Qin Meng,Hao R. Li,Cong M. Wang

Generally, amine group captures CO 2 according to 2:1 or 1:1 stoichiometry. Here, we report a kind of improved carbon capture using amino-functionalized ionic liquids (ILs) through 1:2 stoichiometry. A serial of amino-functionalized ILs various with basicity and steric hindrance of anion were designed, prepared, and applied in CO 2 capture. Through a combination of absorption experiment, quantum chemical calculation, spectroscopic investigation and calorimetric method, the results indicated that one amine group could bind two CO 2 through proton transfer (PT) process and intramolecular hydrogen bond formation, which leading to enhanced capacity that breaks through equimolar. The basicity and steric hindrance of anion play a significant role in promoting amine group to capture two CO 2 . [P 66614 ] 2 [Asp] with dual anion was further designed and synthesized to promote PT process, which showed high capacity of 1.96 mol/mol IL at 30°C and 1 atm as well as excellent reversibility. © 2018 American Institute of Chemical Engineers AIChE J , 65: 230–238, 2019

CO2 capture with hybrid absorbents of low viscosity imidazolium-based ionic liquids and amine

Min Xiao,Helei Liu,Hongxia Gao,Wilfred Olson,Zhiwu Liang

In this work, nonaqueous binary absorbents were investigated for CO 2 capture by mixing conventional amines (i.e. monoethanolamine MEA, methyldiethanolamin MDEA) and ionic liquids. Four ionic liquids [BMIM]BF 4 , [BEIM]BF 4 , [BPIM]BF 4 and [BBIM]BF 4 were synthesized. The thermal stability of the ionic liquids was evaluated and viscosity was measured over the temperature range of 298–348 K. The CO 2 absorption performance of the pure ionic liquids was studied at ambient pressure and compared with the hybrid absorbents. The influence factors including temperature, stir rate and cycling numbers were then investigated. Finally, the CO 2 absorption mechanism was verified using NMR spectroscopy. Results showed that additional amine could greatly promote the CO 2 absorption performance of ionic liquids and mixed absorbents revealed different CO 2 absorption behavior depending on the amine type. This work proved that the mixed absorbent MDEA + [BEIM]BF 4 yields high cycling CO 2 capacity, energy saving, good regenerability and especially, low viscosity.

Rapid room temperature conversion of hydroxy double salt to MOF-505 for CO2 capture

Yongwei Chen,Houxiao Wu,Qiangqiang Xiao,Daofei Lv,Feier Li,Zhong Li,Qibin Xia

Given the fact that solvothermal synthesis is the most common synthetic method to obtain metal–organic frameworks (MOFs) on a gram scale, it still remains a great challenge to produce MOFs in a scalable and sustainable synthetic process. In this work, we develop a facile and rapid synthesis of copper-based MOF-505 by the exploitation of layered (Zn,Cu) hydroxy double salt as the intermediate for efficient MOF-505 crystallization at room temperature, in which [(Zn,Cu)(OH)NO3] is synthesized by reacting ZnO with Cu(NO3)2. Under an optimized reaction time of 25 min, MOF-505-25 exhibits a Brunauer–Emmett–Teller (BET) surface area of 1076 m2 g−1 and the pore size is narrowly distributed at 5.9 and 8.0 Å. With respect to CO2 adsorption and separation performance, MOF-505-25 shows a moderate CO2 uptake of 3.51 mmol g−1 at 298 K and 100 kPa and high CO2/CH4 and CO2/N2 adsorption selectivities of 7 and 29. Particularly, the formation of MOF-505 can be completed within a short reaction time (less than 30 min) whilst maintaining high quality. This facile and rapid room temperature synthetic procedure would pave the way for promoting the development of MOF materials large-scale production with minimizing the energy input.

CO2 regulates phase transition of sodium oleate and 3-(diethylamino)-propylamine in aqueous solution

Dongfang Liu,Youlin Ma,Jiang Tan,Lu Wang,Quanwu Tang,Hongsheng Lu

We reported that the phase conversion of the micelles in aqueous solution prepared by sodium oleate (NaOA) and 3-(diethylamino)-propylamine (DEAPA) in the presence of carbon dioxide. This micellar structure is very sensitive to CO2 and the pH value of the solution is continuously reduced with the continuous introduction of carbon dioxide. When pH > 10.2, the mixed solution of NaOA and DEAPA is mainly in the form of spherical micelles; when the 10.2 > pH > 9.6, the mixed solution mainly in the worm-like micelles (WLM), where the solution has a significant viscosity change; when the 9.6 > pH > 9.1, the NaOA and DEAPA mixed solution becomes the aqueous two-phase system (ATPS), which is composed of two layers, the upper layer is the vesicle structure and the lower layer is the WLM structure; when the pH between 9.1 > pH > 9.0, NaOA and DEAPA mixed solution form vesicles, thus realizing the regulation of CO2 on the micellar structure transition of NaOA and DEAPA mixed solution. Such these microstructures transition could be confirmed by Rheology measurement, DLS and Cryo-TEM.

CO2 responsive wormlike micelles based on sodium oleate, potassium chloride and N,N-dimethylethanolamine

Jinyu Wang,Dongfang Liu,Zhiyu Huang,Cunchuan Zheng

Preparation and characterization of small molecular amine modified PVAm membranes for CO2/H2 separation

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.

Efficient fixation of CO2 into organic carbonates catalyzed by 2-hydroxymethyl-functionalized ionic liquids

Jin-Quan Wang,Wei-Guo Cheng,Jian Sun,Tian-Yuan Shi,Xiang-Ping Zhang,Suo-Jiang Zhang

Several novel 2-hydroxymethyl-functionalized ILs act as the catalysts for synthesis of cyclic carbonates from CO2 and epoxides without the use of any co-catalysts or organic solvent. Moreover, the 2-hydroxymethyl-functionalized ILs were compatible with base, which combined with K2CO3 were used as effective catalytic system for green synthesis of dimethyl carbonate from CO2via ethylene carbonate without catalyst separation. Additionally, the mechanistic details of the fixation of CO2 into cyclic carbonate catalyzed by 2-hydroxymethyl-functionalized ILs were also elucidated by density functional theory. The process reported here represents a simple, ecologically safer, cost-effective and energy-saving route to organic carbonates from CO2.

Interfacially polymerized polyetheramine thin film composite membranes with PDMS inter-layer for CO2 separation

Alsamani A.M. Salih,Chunhai Yi,Hailing Peng,Bolun Yang,Lijuan Yin,Wei Wang

Polyether based thin film composite (TFC) membranes were developed by interfacial polymerization (IP) on polysuylfone (PSf) ultra-filtration membrane with poly (dimethylsiloxane) (PDMS) inter-layer. Polyetheramine (PEA) and Trimesoyl Chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. The thickness of the PDMS inter-layer was 550   nm, while IP separation layer was only 100   nm. The effects of the PDMS inter-layer and the PEA molecular weight on the TFC membrane performance were investigated. The gas permeation results show that the TFC membrane with PDMS inter-layer exhibits higher CO 2 /N 2 selectivity compared to the membranes without PDMS inter-layer. PDMS inter-layer is able to eliminate the defects on the support membrane and diminish the TMC hydrolysis as well. Among the membranes prepared with three different molecular weight PEAs (ED-600, ED-900 and ED-2003), the membrane of ED-900 exhibits the best performance with an impressive CO 2 permeance of 360 GPU and CO 2 /N 2 selectivity of 67.2 for a mixture CO 2 /N 2 (20/80 by volume), while for a mixture of CO 2 /CH 4 (10/90 by volume) it demonstrates CO 2 permeance of 275 GPU and CO 2 /CH 4 selectivity of 31.6.

Synthesis of liquid-like trisilanol isobutyl-POSS NOHM and its application in capturing CO2

Bai Haipeng,Zheng Yaping,Li Peipei,Zhang Aibo

The trisilanol isobutyl polyhedral oligomeric silsesquioxane(POSS) was fabricated into liquid-like nanoparticle organic hybrid materials(NOHMs) with γ-(2,3-epoxypropoxy)propytrimethoxysilane as corona and polyetheramine M2070 as canopy, and the product was called liquid-like POSS NOHM. The liquid-like POSS NOHM has a low viscosity at room temperature without any solvent and the mass fraction of trisilanol isobutyl POSS was 23.38%. The liquid-like POSS NOHM shows great CO 2 capturing property with a capacity of 2.108 mmol/g( p CO 2 =6 MPa). The physical adsorption increased obviously with the pressure going up and it may make a difference between liquid-like POSS NOHMs and traditional monoethamolamine(MEA) based CO 2 absorbent. The recycle property was also studied. The NOHM behaved as fresh product even after 10 cycles.

Absorption Performance and Mechanism of CO2 in Aqueous Solutions of Amine-Based Ionic Liquids

Pengcheng Hu,Rui Zhang,Zhichang Liu,Haiyan Liu,Chunming Xu,Xianghai Meng,Meng Liang,Shuangshuang Liang

Several amine-based ionic liquids (ILs) were synthesized via a one-step method using low-priced organic amines and inorganic acids, and they were mixed with water to form new CO2 absorbents. The effects of the ionic structure, IL concentration, temperature, and pressure on the CO2 absorption performance were investigated. The absorption performance of ILs was closely related to the ionic structure, and the CO2 molar absorption capacity in ILs with the same cation followed the order of [NO3] > [BF4] > [SO4] or [HSO4], whereas that with the same anion ranked in the following order: multiple amine > diamine > monoamine. The IL [TETA][NO3] with 40 wt % concentration showed the best capacity for CO2 absorption. Moreover, low temperature and high pressure favored CO2 absorption. The reaction mechanism of the amine group with CO2 in aqueous solutions of [TETA][NO3], primary amine, and secondary amine was studied via in situ infrared (IR) spectrophotometry. The results showed that the primary and secondary amines first reacted with CO2 to form carbamate, which decomposed further into bicarbonate with the continuous addition of CO2. However, carbamate generated from the reaction of [TETA][NO3] with CO2 did not decompose further.